The breakthrough Dmitri Mendeleev had when constructing the periodic table occurred when Mendeleev placed the elements in a sequence of increasing atomic mass.
The breakthrough Dmitri Mendeleev had when constructing the periodic table occurred when he realized that the properties of elements were repeating in a pattern based on their atomic structure, and not just their atomic mass.
Dmitri Mendeleev was a Russian chemist who is known for creating the first periodic table of elements. He initially arranged the elements in a sequence of increasing atomic mass, but he soon realized that this arrangement did not accurately reflect the properties of the elements. Instead, he found that the properties of the elements were repeating in a pattern based on their atomic structure, specifically the number of protons in the atomic nucleus.
Based on this realization, Mendeleev arranged the elements in a table according to their atomic structure and properties, creating the first periodic table. This table showed a repeating pattern of properties for elements in the same vertical column (group), and he was able to predict the properties of elements that had not yet been discovered based on this pattern.
Mendeleev's breakthrough was significant because it provided a new way of understanding the relationships between the elements, which laid the foundation for modern chemistry and helped to explain many chemical reactions and processes.
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how many grams are in 4.9 moles of KCI
360 grams
365.54 grams
15.22 grams
0.066 grams
The mass of the compound that we have is 365.54 grams. Option B
What is the mole?The mole (mol) is the SI unit for measuring the amount of a substance in chemistry.
The mole is used to convert between mass, moles, and number of entities, allowing chemists to work with the macroscopic amounts of substances they need to, while still having a convenient way of expressing their composition at the molecular level.
Now we know that;
Molar mass of KCl = 75 g/mol
Mass of the compound = 4.9 moles * 74.5 g/mol
= 365.54 grams
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Which of the following are accurate methods for measuring the stated volumes? Select all that apply. Using a P200 to measure 2 ul Using a 250 ml cylinder to measure 200 ml Using a 100 ml beaker to measure 60 ml Using a P1000 to measure 680 ul Using a 50 ml conical tube to measure 50 ml
We can measure the stated volumes using:
1) 250 ml cylinder to measure 200 ml
2) 100 ml beaker to measure 60 ml
3) P1000 to measure 680 μl
4) 50 ml conical tube to measure 50 ml.
A micropipette is a common yet essential laboratory instrument used to accurately and precisely transfer volumes of liquid in the microliter. Displacement of Air Utilizing the air displacement concept, a micropipette operates.
It consists of a piston that draws and releases liquid in response to the air pocket rising and falling, respectively. The Micropipette's internal workings are not in direct contact with the sample.
P1000, P200, and P20 are the sizes of the micropipettes and have a range of volumes measured are 100 - 1000 μl, 20 - 200 μl, and 0.5 - 20 μl.
Hence, the P1000 micropipette can measure 680 μl, but P200 cannot measure 2 μl accurately.
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what is the molar mass of a substance that has a mass of 40 grams and a molar amount of 0.8 moles
Answer:
The molar mass is 0.02 g/mol
Explanation:
The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).
[tex]M=\frac{n}{m}[/tex]
We are given
[tex]m=40[/tex] g
[tex]n=0.8[/tex] mol
Substituting our values into the equation gives us
[tex]M=\frac{0.8}{40}[/tex]
[tex]M=0.02[/tex] g/mol
which types of catalysis can increase the rate of a chemical reaction? [select all that apply]group of answer choicesnuclearhomogeneouselectrolyticheterogeneousenzymaticintramolecular
The type of catalysis that can increase the rate of chemical reactions is homogenous electrolytic.
What is catalysis?A catalyst is a compound that can affect the speed of a reaction. However, after the reaction takes place or is completed, the substance can return to its original form in the same or a fixed amount. So that
A homogenous electrolytic is a type of catalyst that functions to accelerate chemical reactions.
A catalyst is a substance that speeds up a reaction without undergoing a chemical change, by lowering the activation energy (Ea). In addition to accelerating, the catalyst can also slow down the reaction rate which is then called the term inhibitor.
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the formula mass of a compound is 108 g/ mole, what is the mass for 1.00 mole of this compound? g ( only input a number as your answer)
If the formula mass of a compound is 108 g/mole, then the mass of 1.00 mole of this compound will be 108 g.
The mass of a compound can be determined by its formula mass and tnumberunt of moles of the compound. For example, if the formula mass of a compound is 108 g/mole, then the mass of 1.00 mole of this compound will be 108 g/mole x 1.00 mole, which equals 108 g. This means that for 1.00 mole of this compound, the mass will be 108 g.
To determine the mass for a different quantity of moles, simply multiply the formula mass by the number of moles.
For example, if the number of moles was 2.00, the mass of the compound would be 108 g/mole×2.00 moles, which equals 216 g. Similarly, if the number of moles was 0.50, the mass of the compound would be 108 g/mole×0.50 moles, which equals 54 g.
Therefore, the mass of a compound can be determined by its formula mass and the number of moles of the compound. For example, if the formula mass of a compound is 108 g/mole, then the mass of 1.00 mole of this compound will be 108 g.
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2. What were the independent, dependent, and control variables in your investigation?
Type your answer here:
3. Write a hypothesis based on observations and scientific principles.
Type your answer here:
Experimental Methods
1. What tools did you use to collect your data?
Type your answer here:
2. Describe the procedure that you followed to conduct your experiment.
Type your answer here:
Data and Observations
1. Record your observations.
Type your answer here:
Conclusions
1. What conclusions can you draw about whether a visual, auditory, or tactile stimulus resulted in the shortest reaction time? Write an evidence-based claim.
Type your answer here:
2. Write a testable question that could be used to further investigate the topic of stimulus response time.
Type your answer here:
60 points
The scientific method is used by biologists and other scientists to pose inquiries about the natural world.
The first step in the scientific method is an observation, which prompts a question from the scientist. They then develop a theory—a verifiable explanation—that responds to the query.
A controlled experiment is a scientific test that is carried out under predetermined circumstances, meaning that only one (or a small number of) variables are altered at a time while all other variables are held constant. The element that differs between the experimental and control groups—in this case, the volume of water—is referred to as the independent variable. The response tested in an experiment to establish if a treatment had an impact is known as the dependent variable.
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Sodium reacts violently in chlorine gas to form sodium chloride. If 2.5 mol of Na and 1.1 mol of Cl2 are placed in a flask and allowed to react, how much sodium chloride could be formed?2Na + Cl2→ 2NaClA) 2.5 mol because the amount of product is determined by the limiting reactant, sodiumB) 3.6 mol because the moles of reactants must equal the moles of productsC) 2.4 mol because 2 mol NaCl form for each 3 mol of reactants that reactD) 2.2 mol because the amount of product is determined by the limiting reactant, chloride
If the 2.5 mole of Na and 1.1 mol of Cl₂ .The sodium chloride could be formed is D) 2.2 mol because the amount of product is determined by the limiting reactant, chloride.
The balanced equation is :
2Na + Cl₂ -----> 2NaCl
The moles of the Na = 2.5 mol
The moles of the Cl₂ = 1.1 mol
1 mole of the Cl₂ react with the 2 moles of the Na
The moles of the Na = 2 × 1.1
The moles of the Na = 2.2 mol
Thus, the Cl₂ is the limiting reactant.
The mole of the NaCl = 2 × 1.1
The mole of the NaCl = 2.2 mol.
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what molecules allosterically downregulate pyruvate dehydrogenase
Pyruvate dehydrogenase (PDH) is allosterically downregulated by a number of molecules.
NADH: An increase in the concentration of NADH can inhibit PDH, as it competes with pyruvate for binding to the active site of the enzyme.
Acetyl-CoA: An increase in the concentration of acetyl-CoA can also inhibit PDH, as it acts as an allosteric inhibitor.
ATP: An increase in the concentration of ATP can also downregulate PDH, as ATP acts as an allosteric inhibitor.
Phosphorylation of the PDH complex by kinases, such as PDK1, can also lead to its inactivation and downregulation.
These molecules act to reduce the activity of PDH by altering its shape or interfering with substrate binding, thus reducing the rate of pyruvate molecules oxidation and promoting anaerobic metabolism.
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which of the following is not major peak in the ms of isopentanea-43b-72c-60d-29e-57
The option (a), is not the major peak in the ms of isopentane
Isopentane, also called methylbutane or 2-methylbutane, is branched-chain saturated hydrocarbon (an alkane) with five carbon atoms, with formula C5H12 or CH(CH3)2(C2H5). Isopentane is extremely volatile and extremely flammable liquid at room temperature and pressure.
Isopentane is a colorless liquid with an alcohol or gasoline-like odor. It is used as a solvent, and as blowing agent in making plastics.
The most intense peak in the mass spectrum is the base peak & is given the value of 100 & intensities of other peaks are expressed relative to this. The base peak in most of the cases is due to molecular ion and is helpful in determining the molecular weight of the compound
The difference between isopentane and neopentane structure is that isopentane consists of four-membered carbon chain with single methyl group that was attached to this chain at second carbon atom. On other hand, neopentane contains four methyl groups attached to carbon atom at centre
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what do you think would be the effect of firing a neutron into one of 100 atoms of uranium-235?
When a neutron is fired into one of 100 atoms of uranium-235, it can cause a chain reaction.
Uranium-235 is an isotope of uranium that is fissile, meaning it can undergo nuclear fission. When a neutron collides with a uranium-235 nucleus, it causes the nucleus to become unstable and break apart into two smaller nuclei and several additional neutrons. These additional neutrons then go on to collide with other uranium-235 nuclei, causing them to undergo fission as well, releasing more neutrons in the processThis process of neutron-induced fission can continue, releasing large amounts of energy in the form of heat and light, as well as radiation. The chain reaction can be controlled or made to stop by adding or removing neutrons from the system, making the neutron to nucleus collision less likely to occur.In a nuclear power plant, the chain reaction is controlled and the heat generated by the fission reactions is used to produce steam, which drives turbines to generate electricity. In a nuclear weapon, the chain reaction is uncontrolled, resulting in a much larger release of energy in a much shorter period of time.
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An object with a mass of 1609 kg is accelerating at a rate 32 m/s when a net force that is acting on the object
The net force acting on an object with a mass of 1609 kg is accelerating at a rate 32 m/s² is 51488 N
What is a net force?The vector sum of the forces exerted on a particle or object is known as the net force. The original forces' impact on the motion of the particle is replaced by the net force, which is a single force.
For an object at rest or moving in constant motion, there is no net force acting on the object.
However, a net force acts on an object when it is accelerating.
The net force acting on an object with a mass of 1609 kg is calculated below:
Net force = mass * acceleration
Net force - 1609 * 32
Net force = 51488 N.
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a liter of water was found to contain 10 mg of benzene (c6h6). what is the concentration of benzene in molarity (m)?
The concentration of benzene in molarity (M) is calculated by dividing the amount of benzene (10 mg) by its molar mass (78.11 g/mol). This gives a concentration of 0.128 M.
To calculate the concentration of benzene in molarity (M), you need to divide the amount of benzene (10 mg) by its molar mass (78.11 g/mol). This gives the concentration of benzene as 0.128 M. The molar mass of a substance is the mass of one mole of the substance, which is equal to Avogadro's number of molecules of the substance.
In this case, one mole of benzene is equal to 78.11 g, and 10 mg of benzene is equal to 0.128 moles. Therefore, dividing 10 mg by 78.11 g/mol gives 0.128 moles, which is equal to 0.128 M.
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lidocaine is a common local anesthetic used to relieve minor pain, itching, and burning. the molecule has 4 double bonds and 1 ring. how many hydrogen atoms would be in lidocaine formula, c14h?n2o?
The Lidocaine formula contains 22 hydrogen atoms.
The chemical formula for Lidocaine is C14H22N2O. The 'C' represents carbon, 'H' represents hydrogen, 'N' represents nitrogen, and 'O' represents oxygen. Based on the formula, there are 14 carbon atoms, 22 hydrogen atoms, 2 nitrogen atoms, and 2 oxygen atoms. In total, the number of hydrogen atoms in the formula is 22.
The chemical formula represents the types and numbers of atoms present in a molecule, but not its 3D structure or exact arrangement of atoms. Lidocaine works by blocking nerve impulses and numbing the area it is applied to, making it a common local anesthetic used in various medical procedures.
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a solution is prepared by combining 5.00 ml of 4.8x10-4 m nascn solution, 2.00 ml of 0.21 m fe(no3)3 solution and 13.00 ml of 0.3 m hno3. calculate the analytical concentrations of scn-. group of answer choices
The analytical concentration of SCN⁻ in the solution is 1.47 x 10⁻⁴ M.
The final concentration of the negatively charged ion SCN⁻ in the solution can be calculated by using the equation of dilution formula, which states that the product of the initial concentration (C1) and volume (V1) of the first solute added, plus the product of the initial concentration (C2) and volume (V2) of the second solute added, is equal to the product of the final concentration (C3) and the total volume (V3) of the solution.
C1V1 + C2V2 = C3V3
Where:
C1 = initial concentration of NaSCN (4.8 x 10^-4 M)
V1 = volume of NaSCN (5.00 mL)
C2 = initial concentration of Fe(NO3)3 (0.21 M)
V2 = volume of Fe(NO₃)₃ (2.00 mL)
C3 = final concentration of SCN⁻
V3 = total volume of solution (5.00 mL + 2.00 mL + 13.00 mL = 20.00 mL)
Rearranging the equation:
C3 = (C1V1 + C2V2) / V3
C3 = (4.8 x 10⁻⁴ M × 5.00 mL + 0.21 M × 2.00 mL) / 20.00 mL
C3 = 1.47 x 10⁻⁴ M
So, the analytical concentration of SCN⁻ in the solution is 1.47 x 10⁻⁴ M.
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ozone is made up of ----- oxygens and is formed when ---- question 2 options: two, oxygen gas reacts with sunlight and mechanical discharges in the atmosphere three, oxygen gas reacts with sunlight and electrical discharges in the atmosphere. two, nitrogen gas reacts with uv light and electrical discharges in the atmosphere. three, oxygen gas reacts with uv light and mechanical discharges in the cryosphere.
Ozone is made up of three oxygens and is formed when two, oxygen gas reacts with sunlight and electrical discharges in the atmosphere.
Ozone is an important component of the Earth's atmosphere as it helps to protect us from the harmful ultraviolet (UV) radiation from the Sun. It is formed when oxygen molecules in the atmosphere are split apart by UV radiation, resulting in two oxygen atoms that then combine with an oxygen molecule to form ozone. This process is known as photochemical smog and occurs mainly in the lower atmosphere. Ozone is also formed in the upper atmosphere from electrical discharges from lightning, and from chemical reactions between nitrogen oxides and hydrocarbons.
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which of the following is a set of allotropes of the same element? select all that apply 1. graphite, tungsten carbide 2. water, ice 3. no, no2, n2o 4. o2, o3 5. aluminum, aluminum oxide
O₂ and O₃ are allotropes of the same element.
There are a number of different allotropes of oxygen that have been discovered. The most common form is molecular oxygen which is also known as dioxygen and triplet oxygen.
It is found in substantial quantities in the atmosphere of our planet. The extremely reactive ozone is still another factor (O₃). Naturally, it only lasts for a very little period of time on the surface of the earth.
The presence of a significant amount of UV radiation produces an atmosphere in low Earth orbit that contains 96% of the oxygen in its atomic form. This atmosphere exists in outer space.
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a 1 liter aluminum cylinder at 5 degrees celsius is filled to the brim with gasoline at the same temperature. if the aluminum and gasoline are warmed to 65 degrees celsius, how much of the gasoline spills out?
If the aluminum and gasoline are warmed to 65 degrees Celsius, the gasoline will expand due to the increase in temperature.
The amount of gasoline that spills out will depend on the coefficient of linear expansion of the aluminum, which is approximately 2.3x10-5 K-1.
This means that for every degree Celsius increase in temperature, the volume of the aluminum cylinder will increase by 2.3x10-5. Thus, for a 10 degree Celsius increase from 5 degrees Celsius to 65 degrees Celsius, the volume of the cylinder will increase by 0.0023 liters. This means that approximately 0.0023 liters of gasoline will spill out.
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1. The volume of blood plasma in adults is 3.1 L The density of blood plasma is 1.03 g/cc: How many pounds of blood plasma are there in the average adult body? (Hint: You can use the density of as a conversion factor once You convert to units of volume).
The average adult body has 3.1 litres of blood plasma with a density of 1.03 g/cc.
What is blood plasma?About 55% of the total volume of blood in a human being is made up of blood plasma, a yellowish fluid.
How do you determine it?We must multiply the volume by the density to determine the weight of the blood plasma in pounds before converting the result.
The volume is first converted from litres to cubic centimetres as follows: 1,000 ml/liter times 3.1 litres equals 3,100 cc.
The weight in grammes is then calculated by dividing the volume in cc by the density in g/cc: 3,100 cc times 1.03 g/cc equals 3,193 g.
The weight in grammes is then converted to pounds as follows: 4,54 g/lb / 3,193 g = 7.01 lb.
As a result, the average adult's body has about 7.01 pounds of blood plasma.
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a balloon with a volume of 8.73 l contains 0.321 moles of helium gas. what is the density of the gas?
The density of the helium gas is: 0.147 g/l
What is density?
It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
The formulas and the procedures we will use are:
d = m/vn = m / MWWhere:
v= volumed= densitym= massn = molesMW = molecular weightInformation about the problem:
n= 0.321 molMW(he) = 4.003 g/molm = ?v = 8.73 ld = ?Applying the mole(n) formula and clearing the mass we get:
m(he) = 0.321 mol * 4.003 g/mol
n(he) = 1.284 g
Applying the density formula we get:
d = m /v
d = 1.284 g/8.73 l
d = 0.147 g/l
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suppose you found out that i = 3.11 for some unknown acid. what could you conclude about the dissociation of the acid? how many hydrogen atoms can dissociate from the acid?
With a pKa of 3.11, the unidentified acid is partially dissociated in solution, which means that some of the hydrogen atoms in the solution are no longer bound to the acid.
the molecule's atoms have split apart to create hydrogen ions (H+) and the matching anion. There are 0.0498 moles of hydrogen ions that have dissociated. The strength of an acid in solution is determined by the ionization constant (pKa). The strength of the acid increases with decreasing pKa, which means that it dissociates more easily and generates more hydrogen ions (H+) in solution. A greater pKa value, on the other hand, indicates that the acid is weaker and less likely to dissociate.
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Question: The important hormone adrenaline, which has been seen in shows like Firefly and The Big Bang Theory, is synthesized in our bodies by what type of chemical reaction? a. Elimination b.SN_1 c. Sn_2 d. None of the above
The body's fight-or-flight response is triggered by adrenaline. Airways widen as a result of this reaction, giving the muscles the oxygen they require to either fight or flee danger.
Adrenaline also causes blood arteries to constrict, rerouting blood away from important muscle groups like the heart and lungs and toward them instead. a metallopeptide containing PtCl2 and coordinated platinum to the N epsilon-(DL-2,3-diaminopropionyl)-D-lysine residue [D-Lys(DL-A2pr)] at position 6, was 50 times more than that of the natural hormone. SB-95, [DL-A2pr(Sal2Cu)]6, Arg5, D-Lys[DL-A2pr(Sal2Cu)]6, D-Ala10] Rats' ovulation was completely inhibited by LH-RH at a dose of 3 micrograms when copper(II) was coordinated to the salicylideneimino moieties produced by the condensation of salicylaldehyde with D-Lys(DL-A2pr)6. Nal(2) is 3-(2-naphthyl)alanine, Pal(3) is 3-(3-pyridyl)alanine, The membrane receptors of rat pituitary and human breast cancer cells exhibited strong affinity for the majority of metallopeptide analogues of LH-RH.
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Below are the balanced equations for the reactions in
Parts 1–3. Review the results of your experiments and look closely over the mole ratios of the chemical reactions. Do your experiments reflect the stoichiometric, molar amounts indicated by the reactions? Discuss this using the evidence from your experiments.
Cu(NO3)2 (aq) + 2NaOH(aq) —> Cu(OH)2 (s) + 2NaNO3 (aq) Note: Cu(OH)2 is a blue precipitate.
FeSO4 (aq) + 2NaOH(aq) —> Fe(OH)2 (s) + Na2SO4 (aq) Note: Fe(OH)2 is a dark green precipitate.
Fe(NO3)3 (aq) + 3NaOH(aq) —> Fe(OH)3 (s) + 3NaNO3 (aq)
Note: Fe(OH)3 is a red-
orange precipitate.
The reactants in the aqueous solutions gave rise to a precipitate.
What are the precipitates?We have to note that when we have two reactants that are in the aqueous states and then the reaction of the two substances that are in the aqueous state would lead us to the formation of a solid product, we can say that there have been the formation of a precipitate.
In this case we can see that experiments all led to the formation of the precipitates and that the stoichiometric of the precipitates agrees with the reaction.
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How can you successfully measure 100. of water using the given devices?
Which one of the following?
O Create a length relationship on the can using the following method: Use the ruler to measure the length of the juice can from top to bottom, place a mark that represents the ratio (100. mL water/300. mL can) of the length of the can, and then fill the can to this mark with water to make your cake with the required 100 mL of water.
O Create the conversion factor 300. mL /z oz using the following method: Fill the juice can with water, and pour all of it into the measuring cup. Read the equivalent number of z oz on the cup to create a ratio between 300. mL of water and z oz of water. Use this ratio as a conversion factor (300. mL /z oz) to find the number of ounces required to make your cake.
O Create the formula 100. mL/300. mL × w oz using the following method: Fill the 2-cup (16-oz) measuring cup to capacity, and then pour water into the juice can to fill it. Note the volume remaining in the measuring cup (w oz), and use the formula 100. mL water/300. mL can× w oz of water to make your cake.
O Create the conversion factor z oz/300. mL using the following method: Fill the juice can with water, and pour all of it into the measuring cup. Read the equivalent number of z oz on the cup to create a ratio between 300. mL of water and z oz of water. Use this ratio as a conversion factor (z oz/300. mL ) to find the number of ounces required to make your cake.
The correct option to successfully measure 100 mL of water using the given devices is: O Create a length relationship on the can using the following method:
Use the ruler to measure the length of the juice can from top to bottom, place a mark that represents the ratio (100 mL water/300 mL can) of the length of the can, and then fill the can to this mark with water to make your cake with the required 100 mL of water. Hence option A is correct.
With this technique, a visual reference is made on the can itself. The can must be filled to the designated level, which represents the required amount of water (100 mL). Using this method, the necessary volume may be measured directly without the use of converters or other tools.
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Which one of the solution is more diluted 2M or 3M
2M is more preferable and acceptable
consider polonium metal, the only metal under to exhibit the simple cubic crystal structure at stp conditions. what is the maximum diameter of sphere, in pm, that would fit perfectly within the interstitial space (empty space) in the middle of the simple cubic unit cell? the atomic radius of polonium is 190 pm (picometers).
The maximum diameter of a sphere polonium metal that would fit perfectly within the interstitial space of a simple cubic unit cell can be calculated as the distance between two opposite corners of the unit cell, which is equal to the edge length of the unit cell. The edge length of the simple cubic unit cell can be calculated as follows:
Edge length = 2 * atomic radiusEdge length = 2 * 190 pm = 380 pmTherefore, the maximum diameter of the sphere polonium metal that would fit perfectly within the interstitial space of the simple cubic unit cell of polonium is 380 pm.
About Polonium MetalPolonium Metal was used in nuclear experiments with elements such as beryllium which release neutrons when bombarded by alpha particles. In printing and photographic equipment, polonium is used in devices that ionize air to dissipate electrostatic charge buildup.
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What can be said about the differences between the two types of water?A. There are no differences between the two types of water. B. Tap water is more acidic than bottled water. C. Bottled water is more acidic than tap water, D. There is not enough information to determine a conclusion
The difference between in the two types of the water is the correct option is : C. Bottled water is more acidic than tap water
The Pure water has a pH of 7 and that is considered as the neutral because it is neither the acidic nor the basic qualities. The pH scale ranges from the 0 to 14 . Th epH value which is less then the 7 is considered as the acidic in nature. The pH value greater than the 7 is said to be basic in nature. The pH value of the 7 is the neutral value it means the water is neither the acidic nor the basic.
Thus, Bottled water is more acidic than tap water and the tap water is safer than the bottled water.
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how many joules of energy must be removed from 126 g of water at 24oc to form ice at –15oc?
The answer is 153.7 kJ.1 g of water requires 100 calories to heat from its freezing point of 0 C to its boiling temperature of 100 C.
The latent heat of vaporization is what is causing this. To raise the temperature of 40 grams of water by 50 degrees, we must figure out how much heat is being absorbed. Mg delta is equivalent to Celsius. 40 grams of mass is equal to 1 into 50 points, which equals 2000 calories or 478.5 joules. Latent heat of vaporization is the amount of heat required to vaporize water into steam. As a result, the steam at 100°C contains greater heat.
Find the amount of heat needed to change 100.
100 C vapor to 0 C water
q \s4 \s= \sm \s⋅ \sΔ \sH \sv \s= \s50.0 \sg \s⋅ \s2257 \sJ \sg \s= \s112850 \sJ
5. Calculate the amount of heat needed to transform 100 C of vapor into 120 C of vapor:
q \s5 \s= \sm \s⋅ \sc \sv \sa \sp \so \sr \s⋅ \sΔ \sT \s= \s50.0 \sg \s⋅ \s2.09 \sJ \sg \s⋅ \s∘ \sC \s⋅ \s( \s120 \s∘ \sC \s− \s100 \s∘ \sC \s) \s= \s2090 \sJ
Consequently, the total heat needed is
q \sT \sO \sT \sA \sL \s= \sq \s1 \s+ \sq \s2 \s+ \sq \s3 \s+ \sq \s4 \s+ \sq \s5 \s= \s152696.5 \sJ \s= \s153.7 \sk \sJ
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Is Nickel (iii) sulfide Ionic or molecular/covalent?
Based on the nature of the chemical bonds present in the compound, Nickel (iii) sulfide is an ionic compound.
What are ionic compounds?
A chemical compound known as an ionic compound is one in which ions are bound together by electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions—known as cations and anions—the molecule is generally neutral.
In the compound nickel (iii) sulfide, the compound contains ionic bonds formed from positive nickel(iii) ions and the sulfide ion.
Hence, the compound is an ionic compound.
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An exce of Al and 6. 0 mom of Br2 are reacted according to the equation How many mole of AlBr3 will be formed auming 100% yield
An excess of Al and 6. 0 mol of Br₂ are reacted according to the equation. There would be 4 moles of AlBr₃ will be formed asuming 100% yield.
First we should write the equation for the reaction between Al and Br₂ is:
2Al + 3Br₂⇒ 2AlBr₃
The reactant has excess aluminum so bromine would be the limiting reagent.
From the equation we know that 2 moles of aluminum reacted with 3 moles of bromine produce 2 moles of AlBr₃. so with unitary method we can calculate the moles of AlBr₃.
Moles AlBr₃ = 2/3 x moles Br
Moles AlBr₃ = 2/3 x 6. 0 moles
Moles AlBr₃ = 4 moles.
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The solubility of CuCl2(s) would ______ with increasing solvent temperature.
CuCl2(s) would be more soluble as the solvent temperature rose.
What happens to a solid substance's solubility when the temperature rises?The average kinetic of the solutes increases along with the solution's temperature. As a result, the molecules have a lower ability to bind together and dissolve more easily. Therefore, when temperature rises, solid states become more soluble.
Do temperature fluctuations affect solubility?Temperature affects a given solute's potential to dissolve in some kind of a particular solvent. The permeability of liquids and particles rises with temperature. Similar to liquids, gases become less soluble as temperature rises.Dissolution rate of the solute will consequently increase as temperature rises.
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