The reactivities of the halogens(17th group) decrease down the group ( At < I < Br < Cl < F). This is due to the fact that atomic radius increases in size with an increase of electronic energy levels. This lessens the attraction for valence electrons of other atoms, decreasing reactivity.
dissociation of(NH4)2SO4 and hydrolysis
Dissociation of (NH4)2SO4 refers to the process by which ammonium sulfate ionizes in aqueous solution to produce ions.
Hydrolysis, on the other hand, is a chemical reaction in which water reacts with a substance to produce new molecules.
What is the reaction of the dissociation of(NH4)2SO4?Ammonium sulfate is a salt that consists of two ammonium ions (NH4+) and one sulfate ion (SO4^2-). In water, the ionic bonds in ammonium sulfate break apart and the ions become hydrated, meaning they are surrounded by water molecules.
The equation for the dissociation of ammonium sulfate in water is shown below:
(NH4)2SO4 + H2O ⇒ 2NH4+ + SO4^2-
Hydrolysis
In the context of ammonium sulfate, hydrolysis refers to the reaction between the ammonium ion (NH4+) and the hydroxide ion (OH-) to produce a new molecule.
The equation for the hydrolysis of ammonium sulfate in water is shown below:
NH4+ + OH- -> NH3 + H2O
It's important to note that while dissociation and hydrolysis both involve the reaction of a substance with water, they produce different products and have different effects on the substance. Dissociation leads to the formation of ions, while hydrolysis leads to the formation of new molecules.
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How many formula units are in 5.50 grams of AgNO3
To compute the number of formula units in 5.50 grams of AgNO3, first calculate the molar mass of the compound, which is the sum of the atomic masses of silver (Ag), nitrogen (N), and oxygen.
(O). Molar mass of AgNO3 = (1 x Ag atomic mass) + (1 x N atomic mass) + (3 x O atomic mass) The molar mass of AgNO3 is equal to (1 x 107.87 g/mol) + (1 x 14.01 g/mol) + (3 x 16.00 g/mol). The molar mass of AgNO3 is 169.87 g/mol. Therefore, using the molar mass, we can convert the mass of AgNO3 to moles of AgNO3: moles AgNO3 = AgNO3 mass / AgNO3 molar mass moles AgNO3 = 5.50 g / 169.87 g/mol moles AgNO3 = 0.0324 mol Lastly, we may employ Avogadro's number, 6.022 x To convert moles of AgNO3 to formula units, multiply by 1023: formula units = moles AgNO3 x Avogadro's number formula units = 0.0324 mol x 6.022 x 1023 formula units/mol formula units = 1.95 x 1022 formula units/mol formula units = 1.95 x 1022 formula units As a result, 5.50 grams of AgNO3 contains roughly 1.95 x 1022 formula units.
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Which water features are often associated with condensation?
Frozen lakes
The Ocean
Clouds and Dew
Water vapor rising from plants.
The water features are often associated with the condensation is the correct option are The Ocean and the Clouds and Dew.
The Condensation is the process where the water vapor will becomes the liquid. The condensation is the reverse of the evaporation, in which the liquid water becomes the water vapor. The Condensation is occurs one of the two ways: the first way is the air is cooled to the dew point and it will becomes so saturated with the water vapor and it cannot be hold more of the water.
Thus, The Ocean and the Clouds and Dew is the feature of water that is connected with the condensation.
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Select the gas with the highest average kinetic energy per mole at 298 K. (Please EXPLAIN )? a) O2b) CO2c) H2Od) H2Oe) All have the same kinetic energry.
The gas which have highest average kinetic energy per mole at 298K is b)CO₂.So,correct option is b.
The kinetic energy of gases is a straightforward, generally critical traditional model of the thermodynamic way of behaving of gases, with which numerous foremost ideas of thermodynamics were laid out. The model depicts a gas as an enormous number of indistinguishable submicroscopic particles (iotas or atoms), which are all in consistent, fast, irregular movement. Their size is thought to be a lot more modest than the typical distance between the particles. The particles go through irregular flexible impacts among themselves and with the encasing walls of the compartment. The fundamental rendition of the model depicts the best gas, and thinks about no different communications between the particles.
The kinetic energy of gases makes sense of the perceptible properties of gases, like volume, pressure, and temperature, as well as transport properties like consistency, warm conductivity and mass diffusivity. Because of the time reversibility of minute elements (minuscule reversibility), the motor hypothesis is likewise associated with the guideline of nitty gritty equilibrium, concerning the variance dissemination hypothesis (for Brownian movement) and the Onsager proportional relations.
We know that average kinetic energy is given by the formula =(1/2) mv²
Since temperature is same for all gases, so speed will remain same.
Now,molecular mass will be deciding factor.So,gas which have high molecular mass will have more average kinetic energy.
Molecular mass of O₂=32g
Molecular mass of CO₂=44g
Molecular mass of H₂O(g)=18g
Molecular mass of H₂O(l)=18g
Hence,option b is correct.
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What are three ways synthetic polymers affect the environment? (Worth 100 points)
A. Some synthetic polymers use materials from Earth that are nonrenewable.
B. They can end up as waste products that sometimes can’t be recycled.
C. They sometimes release toxins into the environment.
D. They’re available in limited amounts, so their supply will soon get depleted.
E. They don’t share the same properties as the materials they’re made of.
Answer:
I Choosed:
A. They can end up as waste products that sometimes can’t be recycled.
B. They sometimes release toxins into the environment.
C. They use materials from Earth that are nonrenewable.
Explanation:
A. Synthetic polymers, such as plastic, can end up as waste in landfills, oceans, and other natural areas. This can cause a variety of environmental problems, as some types of plastic do not break down easily and can persist in the environment for decades or even centuries. This accumulation of waste can have negative impacts on wildlife, ecosystems, and human health.
B. Some synthetic polymers are made using harmful chemicals that can leach out and release toxins into the environment. These toxins can have negative impacts on wildlife, ecosystems, and human health. For example, some types of plastic contain chemicals such as bisphenol-A (BPA) that have been linked to hormone disruption and other health problems.
C. The production of synthetic polymers often requires the use of nonrenewable resources, such as petroleum and natural gas. These resources are finite and their extraction and processing can cause environmental damage, including air and water pollution and habitat destruction. The continued use of these nonrenewable resources can exacerbate environmental problems and contribute to climate change.
These are three ways that synthetic polymers can affect the environment, and it's important to consider the impacts of these materials in order to minimize their negative effects and promote sustainability.
most materials are polycrystalline. explain why mechanical properties for polycrystalline materials are often isotropic even though individual crystals typically exhibit anisotropic behavior. (
Polycrystalline materials are composed of many small crystals or grains, each having a specific crystallographic orientation. Due to their randomly oriented nature, the individual grains exhibit different mechanical properties in different directions.
However, when a bulk material is formed by the combination of many grains, their properties get averaged out over the entire material. In the case of mechanical properties, the randomly oriented grains in a polycrystalline material make it isotropic. This is because, although individual grains may have different mechanical properties, the effect of the neighboring grains will average out these differences over the whole material. if a polycrystalline metal is subjected to tensile stress, the stress will cause the deformation of the individual grains. The deformation of the neighboring grains will prevent any particular grain from deforming too much, and the resulting strain in the material will be distributed throughout the grains. As a result, the overall mechanical behavior of the polycrystalline material will be isotropic, even though individual grains may exhibit anisotropic behavior.
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The table below represents three trials of the initial
concentrations of reactants "A" and "B" in units of molarity
(M) versus the initial rate of reaction in units of (M-min-¹).
What is the overall order of this reaction?
Trial
[A]
1
0.20M
2
0.20M
3 0.40M
[B]
0.20M
0.40M
0.20M
Initial Rate
0.4 M/min
1.6 M/min
0.8 M/min
The overall order of the reaction is 3.
What is Order of Reaction?
The order of a chemical reaction refers to the number of molecules or atoms involved in the rate-determining step of the reaction. It is a measure of the relationship between the concentration of the reactants and the rate of reaction. The order of a reaction can be determined experimentally by measuring the initial rates of the reaction at different concentrations of the reactants.
The order of a reaction is the sum of the exponents of the concentration terms in the rate law equation.
Let's write the rate law equation for this reaction as:
rate = k[A]^x[B]^y
where k is the rate constant and x and y are the orders of the reaction with respect to A and B, respectively.
Using the given data, we can determine the values of x and y.
For Trial 1: rate = k(0.20)^x(0.20)^y = 0.4
For Trial 2: rate = k(0.20)^x(0.40)^y = 1.6
For Trial 3: rate = k(0.40)^x(0.20)^y = 0.8
Dividing Trial 2 by Trial 1, we get:
(0.20/0.20)^y = 4
y = 2
Dividing Trial 3 by Trial 1, we get:
(0.40/0.20)^x = 2
x = 1
Therefore, the overall order of the reaction is:
x + y = 1 + 2 = 3
So, the overall order of the reaction is 3.
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Which requires less energy, recycling existing Al or extracting Al from Al2O3? Justify your answer with a calculation
Use math to support your response. 837.5 kJ are needed to produce 1.00 mol of aluminum from Al2O3. Recycling needs less energy since 26 kJ 837.5 kJ.
Recycling aluminum saves 95% more energy than manufacturing it from scratch. Additionally, 97% of the greenhouse gas emissions generated during primary production are avoided. Aluminum is created from bauxite, which is also recycled, saving 9 tonnes of CO2 emissions and 4 tonnes of bauxite production. Since aluminum can be recycled indefinitely and uses up to 95% less energy when recycled than when produced as primary aluminum, it reduces emissions, including greenhouse gas emissions. Nearly a billion tons, or over 75%, of the aluminum produced throughout history is still in use.
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according to the kinetic theory, collisions between molecules in a gas called
According to the kinetic energy theory, collisions between molecules in a gas called elastic collision.
According to the kinetic theory of gases, collisions between molecules in a gas are called elastic collisions. In an elastic collision, the total kinetic energy of the colliding molecules is conserved. This means that the total energy of the system before and after the collision is the same. However, the kinetic energy may be redistributed between the colliding molecules, which can result in a change in their velocities and directions of motion.
Elastic collisions are an important concept in the kinetic theory of gases because they help to explain the macroscopic properties of gases, such as pressure, temperature, and volume, in terms of the behavior of their constituent molecules. For example, when gas molecules collide with the walls of a container, they exert a force that contributes to the pressure of the gas. The rate and frequency of these collisions are affected by the temperature and volume of the gas. The kinetic theory of gases provides a theoretical framework for understanding the relationship between these macroscopic properties and the microscopic behavior of gas molecules.
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what volume of a 0.280 m solution of kbr is needed to precipitate 13.0 g of agbr from a solution containing 0.490 mol of agno3 .
A 0.280M solution of [tex]KBr[/tex] in 16.743 L where 13.0 g of [tex]AgBr[/tex] must be precipitated in order to from an [tex]AgNO3[/tex] solution with 0.490 mol
Given the concentration of [tex]KBr[/tex] = 0.280M
The mass of [tex]AgBr[/tex] = 13g
The number of moles of [tex]AgNO3[/tex] is = 0.490
The volume of [tex]KBr[/tex] required = V
The volume of a 0.280 m solution of [tex]KBr[/tex] needed to precipitate 13.0 g of [tex]AgBr[/tex] from a solution containing 0.490 mol of [tex]AgNO3[/tex] is calculated using the following equation:
[tex]KBr+AgNO3--- > AgBr+KNO3[/tex]
Volume (L) = (Moles * Molar Mass [tex]AgBr[/tex]) / (Molarity [tex]KBr[/tex])
Volume (L) = (0.490 * (107.8682)) / (0.280 mol/L)
Volume (L) = 16.743 L
As a result, 13.0 g of AgBr must be precipitated from a solution containing 0.490 mol of [tex]AgNO3[/tex] using 16.743 L of a 0.280 m solution of [tex]KBr[/tex].
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a pharmacist has 13% alcohol and another 18% alcohol solution how much of each must he use to make 50 g of a 14% alcohol solution?
The correct answer is 40g of 13% alcohol solution and 10g 0f 18% alcohol solution is used by the Pharmacist.
An alcoholic solution is a mixture of water and ethanol used as a solvent. Alcoholic solutions containing ethanol can form during the fermentation of sugar-containing compounds. How much ethanol should be added to the water to make this alcoholic solution? An alcoholic solution is a mixture of water and ethanol used as a solvent.A solution is "a homogeneous mixture made up of two or more components," according to the definition. Alcohol wouldn't contain a lot of chemicals by itself, thus it couldn't be a solution.
However, the word "alcohol" is also often used in English to refer to a range of alcoholic beverages that also include other kinds of molecules, such as ethyl alcohol. Are there any common examples of alcoholic beverages, such as liquor, wine, or beer, that are solutions in the scientific sense that would allow the pun.
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Answer:
40 grams of 13% and 10 grams of 18%.
Notes:
Hi. :)
a saline solution was made by dissolving 1.69 g sodium chloride in 200 ml distilled water. what is the concentrtation of salt in this soution
a saline solution was made by dissolving 1.69 g sodium chloride in 200 ml distilled water,then the concentration of salt in the solution is 8.45 g/L.
To find the concentration of salt in the solution, we need to divide the amount of salt (in grams) by the volume of the solution (in liters).
First, we need to convert the volume from milliliters (mL) to liters (L):
200 mL = 0.2 L
Next, we can calculate the concentration of salt:
concentration = amount of salt / volume of solution
concentration = 1.69 g / 0.2 L
concentration = 8.45 g/L
Therefore, the concentration of salt in the solution is 8.45 g/L.
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In one to two sentences, explain why there is more concern about pollutants in the air during cold months
Air pollution worsens in winter as cold and dry air contains more pollutants. This makes it easy for pollutant air near the surface of the earth to rise and be lifted away.
As a result of the presence of compounds in the atmosphere that are hazardous to human health and the health of other living things, or that impair the climate or materials, air pollution is the contamination of the air.
It is known that cold air usually sinks and warm air usually rises. Most of the time, temperature decreases with elevation. This makes it easy for pollutant air near the surface of the earth to rise and be lifted away.
However, during winter, thermal inversions are more likely to happen. Because sunlight is weaker during this season, air near the earth’s surface may end up being cooler than the air above, causing the pollution-filled air near to earth's surface. Hence, Colder air traps more pollution.
It is also true that rain can wash away pollutants. But in the dry winter season, due to less humidity in the air, the chances of rainfall are generally lower. Hence, dry air contains more pollutants. Therefore, air pollution is worse in winter.
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All atoms of uranium have the same.
1) Mass Number
2) Atomic Number
3) Number of Neutrons plus Protons
4) Number of Neutrons plus Electrons
All atoms of uranium have the same atomic number, which is 92. This means that every uranium atom has 92 protons in its nucleus.
The number of protons determines the element's identity, so all atoms of uranium have the same chemical properties.
The mass number of uranium, however, may vary between different isotopes. Uranium has two major isotopes, uranium-235 and uranium-238, which have 143 and 146 neutrons, respectively. The sum of protons and neutrons in the nucleus of an atom is called its mass number. Therefore, the mass number of uranium-235 is 235 (92 protons + 143 neutrons) and the mass number of uranium-238 is 238 (92 protons + 146 neutrons).
The number of neutrons plus electrons is not a commonly used term in describing atomic properties. The number of electrons in a neutral atom is equal to the number of protons, which is 92 in the case of uranium. However, the number of neutrons plus electrons may vary depending on the ionization state of the atom.
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the compound sodium carbonate is a strong electrolyte. write the transformation that occurs when solid sodium carbonate dissolves in water.
When solid sodium carbonate (Na2CO3) dissolves in water (H2O), it dissociates into its constituent ions Na+ and CO32-.
The chemical equation for the dissociation of sodium carbonate in water is:
Na2CO3 (s) + H2O (l) → 2Na+ (aq) + CO32- (aq)
The sodium ions (Na+) are positively charged, while the carbonate ions (CO32-) are negatively charged. When they dissociate in water, they become surrounded by water molecules, which help to stabilize the ions in solution. Because sodium carbonate is a strong electrolyte, it dissociates completely in water, meaning that all of the solid sodium carbonate dissociates into its constituent ions in solution.
This dissociation of sodium carbonate in water is an example of a chemical reaction, in which the reactant (solid sodium carbonate) is transformed into new products (sodium ions and carbonate ions in solution). It is also an example of an ionic compound dissolving in water, which is a common phenomenon in chemistry.
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Balance the chemical reaction
using an atom inventory.
What is the coefficient for
potassium?
[?]K+ [ ]Br₂
[]KBr
The balanced chemical equation of the reaction between potassium and bromine to form potassium bromide is given as:
2 K + Br₂ ---> 2 KBr.The coefficient of potassium is 2.
What is a balanced chemical equation?A chemical equation that is balanced has equal amounts of each element's atoms on both sides of the equation and conserves mass.
The law of conservation of mass states that when a chemical reaction takes place, the mass of the reactants and products should be equal. As a result, during the chemical process, the number of atoms in each element remains constant. The chemical equation must be balanced as a result.
The balanced chemical equation of the given reaction is as follows:
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What do resonance structures indicate?
Resonance structures are employed when a single Lewis structure for a molecule is insufficient to completely capture the bonding that occurs between adjacent atoms in relation to empirical data on the actual bond lengths between those atoms.
A group of two or more Lewis structures known as resonance structures explain the electronic bonding of a single polyatomic species, including fractional bonds and fractional charges. Unable to be described by a single Lewis formula with an integral number of covalent bonds, delocalized electrons can be described using resonance structures.
The bonding in certain molecules or ions can occasionally defy description by a single Lewis structure, even when formal charges are taken into account. When the bonding cannot be encapsulated by a single Lewis formula, resonance is a means to describe delocalized electrons inside specific molecules or polyatomic ions. There are several contributing structures that depict a molecule or an ion with such delocalized electrons (also called resonance structures or canonical forms).
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solid copper deposits on a piece of aluminum foil when the foil is placed in a blue copper nitrate solution. the blue color of the solution fades.?trackid
The observed phenomena is the result of a chemical interaction between aluminium and copper nitrate. The following happens when aluminium is added to a copper nitrate solution: 2Al + 3Cu(NO3)2 -> 3Cu + 2Al(NO3) (NO3) 3.
The inorganic substance copper nitrate solution has the vivid blue chemical formula Cu(NO3)2. It dissolves easily in water and easily separates into copper (Cu2+) and nitrate (NO3-) ions in solution. Copper nitrate solution is frequently employed in industrial processes like electroplating and as a catalyst in organic synthesis as well as laboratory studies. Moreover, it is employed in the manufacturing of a number of copper-based products, including copper oxide, copper hydroxide, and copper carbonate. While highly reactive, copper nitrate solution can be hazardous if handled improperly, especially when it comes into touch with combustible materials as this could result in the production of explosive compounds. As a result, it needs to be handled carefully and in a controlled environment.
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a buffer consists of equal concentrations of hf and . what happens to the ratio of actually in solution as a strong base, , is added to the equilibrium?
When a strong base is added to a buffer solution containing equal concentrations of a weak acid and its conjugate base, the equilibrium of the buffer shifts towards the conjugate base, and the ratio of weak acid to conjugate base changes.
A buffer solution consists of a weak acid (HF) and its conjugate base (F-). When a strong base, such as NaOH, is added to the buffer solution, the base will react with the weak acid to produce more of its conjugate base and less of the weak acid. This will shift the equilibrium of the buffer towards the conjugate base and increase the concentration of the F- ion in the solution.
However, the buffer is designed to resist changes in pH, so the effect of the added base will be somewhat limited. The buffer will work to restore the original pH by reacting with some of the added base to produce more of the weak acid. As a result, the ratio of the weak acid to its conjugate base will change, but the change will be relatively small.
The key feature of a buffer solution is its ability to resist changes in pH, so even though the ratio of weak acid to conjugate base will change, the overall pH of the solution will change only slightly. This makes buffer solutions useful for maintaining a stable pH in a wide range of applications, such as biological systems and chemical processes.
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A chemical equation is a statement using chemical __ that express both the identities and the relative __ of the reactants and products involved in a chemical or physical change
A chemical equation is a statement using chemical formulas that express both the identities and the relative amounts of the reactants and products involved in a chemical or physical change.
The relative amounts of reactants and products in a balanced chemical equation are described by a reaction's stoichiometry.
Chemical equations are statements that use symbols and formulae to explain a chemical reaction. For instance, when hydrochloric acid and sodium hydroxide solution combine, salt and water are produced along with a significant amount of heat.
Raw materials called reactants interact with one another to create products. Under the proper circumstances, such as temperature, time, or pressure, the chemical bonds of the reactants are broken, and the atoms create new bonds that lead to various combinations.
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Classify the outcomes based on whether they are caused by adding or removing a reactant from a chemical reaction.
The rate of the reverse
reaction increases.
The concentration of
products decreases.
The concentration of
products increases.
The rate of the forward
reaction increases.
A) adding a reactant
B) removing a reactant
PLEASE BE ACCURATE!!! Thank you very much!!:)
Answer:
The rate of the reverse reaction increases - B) removing a reactant
The concentration of products decreases - B) removing a reactant
The concentration of products increases - A) adding a reactant
The rate of the forward reaction increases - A) adding a reactant
Explanation:
In a chemical reaction, adding a reactant increases the amount of reactants in the system, which can increase the rate of the forward reaction. On the other hand, removing a reactant decreases the amount of reactants, which can increase the rate of the reverse reaction.
The increase in the rate of the reverse reaction can lead to a decrease in the concentration of the products. Meanwhile, the increase in the rate of the forward reaction can lead to an increase in the concentration of the products.
So, based on this information, we can classify the outcomes as follows:
The rate of the reverse reaction increases: B) removing a reactant
The concentration of products decreases: B) removing a reactant
The concentration of products increases: A) adding a reactant
The rate of the forward reaction increases: A) adding a reactant
ALLEN
The red subatomic particles can best be described as:a. counted into the mass of the atom, negatively chargedb. located in the electron cloud not counted into the mass of the atom, negatively chargedc. located in the electron cloud not counted into the mass of the atom, no charged. located in the electron cloud counted into the mass of the atom, no chargee. located in the nucleus
The red subatomic particles being referred to in this question are likely electrons, which are negatively charged particles that are located outside the nucleus in the electron cloud of an atom.
Electrons are not counted into the mass of the atom, which is primarily determined by the protons and neutrons in the nucleus. Electrons occupy discrete energy levels around the nucleus and play a critical role in chemical reactions and bonding. The number of electrons in an atom is equal to the number of protons in the nucleus, making atoms electrically neutral overall. Therefore, option (b), "located in the electron cloud not counted into the mass of the atom, negatively charged," is the most accurate description of electrons in an atom.
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in the first 13.0 s of the reaction, 0.018 mol of o2 is produced in a reaction vessel with a volume of 0.380 l . what is the average rate of the reaction during this time interval?
The average rate of the reaction during the first 13.0 seconds is 0.00523 liters per second. The average rate of a reaction is a useful concept in chemical kinetics that allows us to study the rates of chemical reactions and the factors that affect these rates.
The average rate of the reaction during the first 13.0 seconds can be calculated as follows:
First, convert the amount of O2 produced from moles to liters using the volume of the reaction vessel:
0.018 mol x (0.380 L/1 mol) = 0.0684 L
Then, divide the volume of O2 produced by the time interval to obtain the average rate of the reaction:
0.0684 L / 13.0 s = 0.00523 L/s
So the average rate of the reaction during the first 13.0 seconds is 0.00523 liters per second.
The average rate of a reaction during a certain time interval is a measure of the change in the concentration of a reactant or product over that time interval. It is a useful concept in chemical kinetics, which is the study of the rates of chemical reactions and the factors that affect these rates.
In general, the average rate of a reaction can be calculated as the change in the concentration of a reactant or product over a given time interval, divided by the time interval. In this case, the average rate of the reaction was calculated as the change in the volume of O2 produced over a 13.0 second time interval, divided by the time interval.
The average rate of a reaction can be used to determine the overall rate of a reaction, as well as to study how the rate of a reaction changes over time. By measuring the average rate of a reaction at different points in time, it is possible to study the rate-determining step of a reaction and to determine the order of a reaction with respect to each reactant.
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Are the three main groups of elements metals nonmetals and semiconductors?
In contrast, metals, nonmetals, and metalloids are the three primary categories of elements. Metalloids often lie between metals and nonmetals in the periodic table, hence the phrase "semi-conductors."
Elements are the fundamental constituents of matter. They are pure chemicals that cannot be chemically divided into more basic substances. The periodic table contains 118 known elements, each of which has a distinct atomic number, chemical symbol, and set of physical and chemical properties. The periodic table arranges the elements according to their atomic makeup and electron configurations. Metals, nonmetals, and metalloids are the three primary categories of elements. Metals are typically ductile and malleable materials that transfer heat and electricity well. Nonmetals are not malleable or ductile and often perform poorly as heat and electrical conductors. The characteristics of metalloids fall in between those of metals and nonmetals.
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What are metalloids, and why are they sometimes referred to as semiconductors?
suppose a student starts with 2.3621 g of a sand mixture and separates the components into 1.3012 g of n a c l , 0.5560 g of s i o 2 , and 0.4503 g of c a c o 3 . based on the amount of recovered s i o 2 , what is the percent of s i o 2 in the starting mixture?
Starting with 2.3621 g of sand, a student divides the mixture into 1.3012 g of naCL, 0.5560 g of siO2, and 0.4503 g of cAcO3. The quantity of recoverable sio 2 So the beginning combination had 21.2066% of silicon dioxide in it.
A residue weighing 1.46g is produced after heating a 1.5 g mixture of SiO2 and Fe2O3 to a high temperature. 3Fe2O32Fe3O4+21O2 is the reaction that causes weight loss. Two double bonds join the two oxygen atoms to the silicon, giving SiO2 its linear structure. On the Si, there aren't any lone pairings. This would represent an instance of sp hybridization. SiO2 is tetrahedral when it is a polymer. SiO2 insulation layers are frequently applied using plasma-enhanced chemical vapor deposition (PECVD), but this method normally needs a relatively high deposition temperature of about 300 C.
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Hydrogen peroxide has a molar mass of 34 g/mol and a chemical composition of 5.9 percent H and 94.1 percent O. Determine its molecular formula.
Answer:
Explanation: The molecular formula is H2O2.
Answer:
H2O2
Explanation:
The molecular formula for hydrogen peroxide can be determined by using its molar mass and the percent composition of hydrogen and oxygen.
First, we need to find the number of moles of each element in 1 mole of hydrogen peroxide.
5.9% of hydrogen peroxide is hydrogen, which is 0.059 moles.
94.1% of hydrogen peroxide is oxygen, which is 0.941 moles.
Next, we use the molar mass to calculate the number of atoms in 1 mole of hydrogen peroxide.
The molar mass of hydrogen is 1 g/mol, so there are 0.059 moles of hydrogen atoms in 1 mole of hydrogen peroxide.
The molar mass of oxygen is 16 g/mol, so there are 0.941 x 16 = 15.056 moles of oxygen atoms in 1 mole of hydrogen peroxide.
Since there are 0.059 moles of hydrogen atoms and 15.056 moles of oxygen atoms in 1 mole of hydrogen peroxide, the molecular formula is H2O2 (two hydrogen atoms and two oxygen atoms).
In order to combat the cold here on campus, you may have seen OSU facilities use a
brine solution to de-ice the roads and sidewalks. Brine, a concentrated salt solution,
better prevents and eliminates ice from the roads, but can be more costly to store and
disburse along the roadways.
Why is brine a more effective de-ice solution than solid ice melt products? Select all
that apply
Brine is NOT more effective than traditional ice melt products. Since brine is already a solution, the Van't Hoff Factor is higher than solid salt, making the freezing point depression greater. Brine is a higher concentration than solid salts, making the freezing point depression greater. Freezing point depression requires a solution to occur. Brine starts as a solution, where solid salt must form a solution first. The brine solution can more evenly coat the surface of the road, making the ice prevention more widespread.
The brine a more effective de-ice solution than solid ice melt products is the correct option is : Since brine is already a solution, the Van't Hoff Factor is higher than solid salt, making the freezing point depression greater.
The Brine, is the concentrated salt solution, that is better to prevents and to eliminates the ice from the roads, but it can be more costly to store it. Since the brine is already the solution, the Van't Hoff Factor will be higher than the solid salt, the making is the freezing point depression is greater.
Freezing point depression requires a solution to occur. Brine starts as a solution, where solid salt must form a solution first.
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if a student dissolved benzoic acid in dcm and then added aqueous sodium hydroxide, how many layers would form? would benzoic acid still be present? in which layer? use a flow chart or equations to accompany your explanation.
When benzoic acid is dissolved in dichloromethane (DCM) and then aqueous sodium hydroxide is added, the solution will form two layers, an organic layer (DCM) and an aqueous layer.
Benzoic acid is a weak acid and will partially dissociate in water to form the benzoate anion and a hydronium ion (H3O+). When sodium hydroxide is added to the solution, it will react with the hydronium ion to form water and sodium ion. This will shift the equilibrium towards the formation of more benzoate anion, which is a water-soluble salt. The benzoate anion will then partition into the aqueous layer.
On the other hand, DCM is a nonpolar solvent that is immiscible with water. Benzoic acid is a weak acid with a pKa of 4.2, which means that it is only partially dissociated in DCM. As a result, benzoic acid will be predominantly present in the organic layer as the undissociated acid.
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which of the following aqueous solutions will have the highest boiling point? which of the following aqueous solutions will have the highest boiling point? 0.10 m na2so4 0.20 m glucose 0.10 m nacl 0.10 m srso4 0.25 m sucrose
Among the given aqueous solutions, 0.25 M sucrose will have the highest boiling point. Boiling point of a substance is the point in which the vapor pressure of a liquid is equal to the surrounding pressure.
Here we have given the molality of different aqueous solutions including 0.10 M [tex]Na_{2} SO_{4}[/tex] , 0.20 M glucose, 0.10 M [tex]NaCl[/tex], 0.10 M [tex]Sr SO_{4}[/tex] and 0.25 M sucrose.
The boiling point will be depending on the molality of each solution given. Molality is the number of moles of solute per kilogram of solvent. When molality is higher boiling point also will be higher.
We are considering the solutions with same temperature and pressure. Now the solution with the highest molality will be the one with the highest boiling point.
0.10 M [tex]Na_{2} SO_{4}[/tex]: [tex]Na_{2} SO_{4}[/tex] has a molar mass of 142 g/mol, so 0.10 M means there are 14.2 g of [tex]Na_{2} SO_{4}[/tex] per liter of solution. If we assume the density of the solution is 1 g/mL, then the molality is 0.10 mol / 0.1 kg = 1.0 m.
0.20 M glucose: Glucose has a molar mass of 180 g/mol. That is 0.20 M means there are 36 g of glucose per liter of solution. If we assume the density of the solution is 1 g/mL, then the molality is 0.20 mol / 0.1 kg = 2.0 m.
0.10 M [tex]NaCl[/tex]: [tex]NaCl[/tex] has a molar mass of 58.5 g/mol. That is 0.10 M means there are 5.85 g of [tex]NaCl[/tex] per liter of solution. If we assume the density of the solution is 1 g/mL, then the molality is 0.10 mol / 0.1 kg = 1.0 m.
0.10 M [tex]SrSO_{4}[/tex]: [tex]SrSO_{4}[/tex] has a molar mass of 183.7 g/mol. That is 0.10 M means there are 18.37 g of [tex]SrSO_{4}[/tex] per liter of solution. If we assume the density of the solution is 1 g/mL, then the molality is 0.10 mol / 0.1 kg = 1.0 m.
0.25 M sucrose: Sucrose has a molar mass of 342 g/mol. That is 0.25 M means there are 85.5 g of sucrose per liter of solution. If we assume the density of the solution is 1 g/mL, then the molality is 0.25 mol / 0.1 kg = 2.5 m.
Therefore, the solution with the highest molality and hence the highest boiling point will be 0.25 M sucrose.
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what part of pyridinium chlorochromate (pcc) allows it to dissolve in organic solvent so it can be used in reactions in the absence of water?
The pyridinium cation in pyridinium chlorochromate (PCC) allows it to dissolve in organic solvents so it can be used in reactions in the absence of water.
Pyridinium chlorochromate (PCC) is a red-orange glasslike strong that is dissolvable in different organic solvents, like dichloromethane (CH2Cl2), chloroform (CHCl3), and CH3)2CO. The piece of PCC that permits it to break down in these organic solvents is the pyridinium cation (C5H5NH+).
The pyridinium cation is a positively charged particle that is shaped by the protonation of pyridine, a six-membered fragrant heterocyclic compound. The positive charge on the pyridinium cation makes it drawn to the negative charge on the chloride particle (Cl-), which is likewise present in PCC. The association between the decidedly charged pyridinium cation and the adversely charged chloride particle frames an ionic bond, which permits PCC to break up in natural solvents.
The dissolvability of PCC in organic solvents makes it helpful in numerous organic reactions where the presence of water should stay away. For example, PCC can be used as a mild oxidizing agent in the absence of water to convert primary alcohols to aldehydes and secondary alcohols to ketones.
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