How many type of particles is a pure substance made up of?

Answer:

The rate of effusion for a gas is inversely proportional to the square-root of its molecular mass (Graham's Law). The gas with the lowest molecular weight will effuse the fastest. The lightest, and therefore fastest, gas is helium.

Explanation:

Note that the point at which oxygen changes from liquid to gas is 90k. See the attached graph.

To plot the data, we can use a line graph with temperature (T) on the x-axis and density (d) on the y-axis. Here is a plot of the data:

From the plot, we can see that the density of oxygen decreases as the temperature increases. At around 90 K, there is a significant drop in density, indicating a change in state from liquid to gas. We can circle this temperature as the point at which oxygen changes from liquid to gas.

Therefore, we can circle the temperature 90 K as the point at which oxygen changes from liquid to gas.

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A wave is defined as a disturbance which transfer energy and momentum from one point to another in a medium. They are mainly of two types, they are longitudinal and transverse.

The distance travelled by the wave during one complete oscillation is defined as the wavelength. The SI unit of wavelength is meter (m). It can also be defined as the distance between two successive crests or troughs of a wave.

The number of oscillations of a wave per unit time is frequency and the time needed to form one complete wave is called the period.

The total number of waves = 6

Period (T) = 60/6 = 10 s

The wavelength of the wave = 10 m

Frequency = 1/T = 1 / 10 = 0.1 Hz

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Explanation:

Refer to pics.............

According to the molar concentration, if the student needs 250 ml of the diluted solution, 50 ml of the original solution should be used and in second case 0.29 liters of the solution should be used.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in second  formula gives volume= 0.36/1.25=0.288 liters. and in case of 2 solutions it is calculated as, M₁V₁=M₂V₂ and on substitution gives V₁=0.1×250/0.5=50 ml.

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The given reaction between FeS and oxygen gas giving ferric oxide and sulphur dioxide can be balanced as follows:

[tex]\rm 4 FeS+ 7O_{2} \rightarrow 2Fe_{2}O_{3} + 4SO_{2}[/tex]

The balanced chemical equation of a reaction represent the perfect stoichiometry of all the reactants and products. It must obey the law of conservation of mass.

Hence, the total mass in the reactant side must be equal to the total mass in the product side. The given reaction between ferrous sulphide and oxygen gas giving sulphur dioxide and ferric oxide can be balanced as written above.

Here, 4 moles of FeS reacts with 7 moles of O₂ giving 2 moles of Fe₂O₃ and 4 moles of SO₂ gas. Here each element has the same number in both reactants side and product side.

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grouping elements into s, p, d, and f blocks allows us to predict the chemical and physical properties of elements based on their electron configurations and periodic table positions.

The periodic table's s, p, d, and f blocks refer to the arrangement of electrons in the atom's outermost energy level (valence shell), and they are related to the element's type and properties in several ways.

Atomic size increases from right to left within a period and from top to bottom within a group.

Ionization Energy: The energy required to remove an electron from an atom is referred to as ionisation energy.

Electronegativity: The ability of an atom to attract electrons towards itself in a chemical bond is measured by electronegativity.

Reactivity: An element's reactivity is determined by the number of valence electrons it possesses. Because the s-block elements have one or two valence electrons, they are extremely reactive.

Chemistry: Ionic compounds are formed by s-block elements with nonmetals, whereas covalent compounds are formed by p-block elements.

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Explanation:

Using mole-mole relationship

If 6 moles of HNO3 will give 2 moles of H20

That means,

1 mole of HNO3 will give 1/3 moles of H20

Therefore,

29 mole of HNO3 will give [(1/3) x 29] moles

= 29/3 moles

= 9.67 moles

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Thanks.

Explanation:

Refer to pic.............

Answer:

To determine the formula mass of the gas, we can use the ideal gas law:

PV = nRT

where P is the pressure of the gas, V is the volume of the container, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas in Kelvin.

First, we need to convert the given temperature of 27°C to Kelvin:

T = 27°C + 273.15 = 300.15 K

Next, we can rearrange the ideal gas law to solve for the number of moles of gas:

n = PV/RT

where P = 300.0 kPa, V = 25.0 L, R = 8.31 J/(mol·K), and T = 300.15 K.

n = (300.0 kPa)(25.0 L)/(8.31 J/(mol·K) x 300.15 K) ≈ 30.12 mol

Now, we can calculate the molar mass (formula mass) of the gas using its mass and the number of moles:

molar mass = mass / number of moles

where the mass is given as 96.0 g.

molar mass = 96.0 g / 30.12 mol ≈ 3.19 g/mol

Therefore, the formula mass of the gas is approximately 3.19 g/mol.

Explanation:

Answer:

3.19

Explanation:

Answer: 3045.07 K

Explanation:

T=PV/nR  = 10.00 X 100 / (4.0 X 0.821) =

The reaction was spontaneous and results in a standard free energy shift of 61.5 kJ.

We define the normal state of any solid or liquid material as the most solid region of that material at the a stress of one bar at any given temperature.For instance, water's standard condition for a temperature of 10 C is ice at the a tension of one bar, and for a temperature of +10 C is liquid at the a compression of one restaurant.

India's average temperature for 2021 was 25.93 ° Celsius, a little increase from 25.78 degrees Centigrade the year before.In that year, the minimum temperature was 20.9 °C.

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The correct answer is

a. It is inversely proportional to the temperature of the gas.

What is Mass?

Mass is a fundamental physical property of matter that determines the weight and force of an object in a gravitational field. It is the amount of matter in an object, and is typically measured in units such as kilograms or grams. The mass of an object is constant and does not change with location, while weight can vary depending on the gravitational force at a given location. Mass is also a measure of the inertia of an object, which is its resistance to a change in motion.

This question relates to the gas laws, specifically the relationship between pressure, volume, temperature, and number of moles of a gas. According to Boyle's Law, when the number of moles of a gas is held constant, pressure and volume are inversely proportional to each other.

However, the question states that volume and number of moles are held constant, so this relationship doesn't apply. Instead, we need to consider Charles's Law, which states that at constant pressure and number of moles, the volume of a gas is directly proportional to its temperature.

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Answer:

I think it is true

Explanation:

I just answer this question

Element X has an electronegativity of 2. 5 and Y has an electronegativity of 9. X is a metal and Y is a non-metal.

The correct answer is option a.

Element X has a lower electronegativity than Element Y, which means that Element X is a metal and Element Y is a nonmetal.

The capacity of an atom to draw electrons towards itself when it establishes a chemical connection with another atom is measured as electronegativity. It is a fundamental feature of atoms and is commonly measured on the Pauling scale, which provides numerical values ranging from 0.7 (for the least electronegative element, cesium) to 4.0 (for the most electronegative element, uranium) (for the most electronegative element, fluorine).

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The bond energy of each carbon-oxygen double bond in carbon dioxide is 188 kJ/mol.

What is Bond Energy?

Bond energy, also known as bond dissociation energy, is the amount of energy required to break a chemical bond between two atoms in a molecule or compound. It is defined as the energy released or absorbed when a chemical bond is formed or broken.

The bond energy of each carbon-oxygen double bond in carbon dioxide can be determined by using the total bond energy of the products and the bond energies of the other bonds involved in the reaction.

The reaction for the formation of carbon dioxide from carbon and oxygen is:

C(s) + O2(g) → CO2(g)

The total bond energy of the products (CO2) in the reaction is given as 1256 kJ. The bond energy of the carbon-oxygen double bond (C=O) in carbon dioxide can be determined by subtracting the bond energies of the other bonds involved in the reaction from the total bond energy of the products.

First, we need to determine the bond energies of the other bonds involved in the reaction. The bond energy of the carbon-carbon triple bond (C≡C) in molecular nitrogen is 946 kJ/mol, and the bond energy of the oxygen-oxygen double bond (O=O) in molecular oxygen is 498 kJ/mol.

The balanced equation tells us that one mole of CO2 is formed from one mole of C(s) and one mole of O2(g). Therefore, the total bond energy of the products in the reaction can be expressed as:

Total bond energy = (Bond energy of C=O bond) + (Bond energy of C≡C bond) + (Bond energy of O=O bond)

1256 kJ/mol = (Bond energy of C=O bond) + 946 kJ/mol + 498 kJ/mol

Solving for the bond energy of the carbon-oxygen double bond (C=O) in carbon dioxide:

Bond energy of C=O bond = Total bond energy - Bond energies of other bonds

Bond energy of C=O bond = 1256 kJ/mol - 946 kJ/mol - 498 kJ/mol

Bond energy of C=O bond = 188 kJ/mol

Therefore, the bond energy of each carbon-oxygen double bond in carbon dioxide is 188 kJ/mol.

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Answer:

1. P4 + 6Cl2 → 4PCI3; already balanced

2. 25.5 moles Cl2

Explanation:

1. The chemical equation for the reaction of phosphorus with chlorine gas to produce phosphorus trichloride is:

P4 + 6Cl2 → 4PCI3

The equation is already balanced

2. The equation shows that 6 moles of chlorine gas are required to produce 4 moles of phosphorus trichloride.

set up a proportion:

6 moles Cl2 / 4 moles PCI3 = x moles Cl2 / 17 moles PCI3

solve for x:

x = (6 moles Cl2 / 4 moles PCI3) x 17 moles PCI3

x = 25.5 moles Cl2

Therefore, 25.5 moles of chlorine gas are required to produce 17 moles of phosphorus trichloride.

Answer:

25.5 moles of Cl₂ required

Explanation:

2P + 3Cl₂ --> 2PCl₃

Since, the stoichiometry (molar ratio) of the reaction is 2 : 3 : 2,

thus, number of moles of Cl₂ = 3/2 × number of moles of PCl₃

∴ number of moles of Cl₂ required is 25.5 moles

Both releasing HCl, CO, and phosgene gas into the air and releasing vinyl chloride can have harmful effects on the environment and human health.

What is high concentration ?

High concentration refers to a large amount or a high proportion of a substance in a given mixture or environment. The specific threshold for what constitutes a high concentration depends on the context and the particular substance involved.

What is EPA ?

The Environmental Protection Agency (EPA) is an independent agency of the United States federal government, established in 1970 to protect human health and the environment. The EPA is responsible for setting and enforcing regulations related to air and water quality, waste management, hazardous materials, and other environmental issues.

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By using the ideal gas law to solve this problem and we get the volume of the container is approximately 1383 liters.

What is ideal gas law?

The ideal gas law is a fundamental equation in the study of thermodynamics and describes the behavior of an ideal gas. The ideal gas law relates the pressure (P), volume (V), number of moles (n), and temperature (T) of a gas:

                           PV = nRT

The ideal gas law assumes that the gas particles have negligible volume and do not interact with each other, except through elastic collisions. While real gases deviate from this ideal behavior at high pressures and low temperatures, the ideal gas law is still a useful approximation for many practical applications.

We can use the ideal gas law to solve this problem:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to convert the temperature to Kelvin:

770.56 K = 497.41 °C + 273.15

T = 1043.56 K

Next, we can plug in the values and solve for V:

V = (nRT)/P

V = (3.7522 mol)(0.08206 L·atm/(mol·K))(1043.56 K)/(7.25 atm)

V ≈ 1383 L

Therefore, the volume of the container is approximately 1383 liters.

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Wool and polystyrene, which trap air, are effective insulators. Aluminum and other metals are excellent heat conductors. A thermos keeps things cold for longer by limiting the flow of heat.

It is common to employ insulators like glass, plastic, rubber, air, and wood. Insulators protect us from the potentially dangerous consequences of electricity flowing via conductors. Voltage levels in electrical circuits can occasionally be extremely high.

Ceramics, wood, rubber, plastic, and rubber are effective insulators. They are frequently employed in the construction of cooking tools, like as saucepan handles, to prevent heat from rising and burning the cook's hand.

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Answer:

Below

Explanation:

1 mole = 6.022 x 10^23 particles

4.25 x 10^26 atoms / 6.022 x 10^23 atoms/ mole = ~ 706 moles

Answer:

0.085049833

Explanation:

use the formula n=number of particles/Avogadro's number and find the value of n which is miles and then use the formula n=mass/molar mass. The molar mass you multiply the mass number of oxygen by 2

molar mass= 32g/mol

Avogadro's number=6.02*10^23

number of particles=1.6*10^21

Part 1: C represents the compound carbon dioxide (CO2),  in the given diagram of the question .

Part 2: One process that could release carbon dioxide into the air is combustion, which occurs when organic compounds (such as fossil fuels) react with oxygen in the air to produce carbon dioxide and water. Other processes that can release carbon dioxide include volcanic eruptions, natural decay of organic matter, and respiration by living organisms.

Part 3: The elements that form carbon dioxide, namely carbon and oxygen, are conserved during the carbon cycle. This is because carbon is constantly being exchanged between the atmosphere, oceans, and land through processes such as photosynthesis, respiration, and decomposition. When plants undergo photosynthesis, they take in carbon dioxide from the atmosphere and use it to build their biomass, incorporating carbon into their structures. When animals eat plants or other animals, they consume this carbon and release carbon dioxide back into the atmosphere through respiration. When organisms die, their bodies decompose and release carbon back into the environment. In this way, carbon is constantly being recycled through the carbon cycle.

The formation of carbon dioxide from the recycling of carbon occurs during cellular respiration, which is the process by which living organisms break down organic compounds (such as glucose) to release energy. During cellular respiration, carbon-based molecules are oxidized, or combined with oxygen, to produce carbon dioxide as a waste product. This carbon dioxide can then be released back into the atmosphere or taken up by plants through photosynthesis.

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Answer:

To determine the number of atoms in 0.28 moles of Beryllium (Be), we need to use Avogadro's number, which is 6.022 x 10^23 atoms per mole.

First, we can calculate the number of moles of Beryllium (Be) in 0.28 moles by multiplying it by Avogadro's number:

0.28 moles x 6.022 x 10^23 atoms/mole = 1.68496 x 10^23 atoms

Therefore, there are approximately 1.68 x 10^23 atoms in 0.28 moles of Beryllium (Be).

Explanation:

A) To calculate the total bond energy, we need to know the bonds broken and formed in the reaction. In this case, the reactants are C₂H₄ and H₂, and the product is C₂H₆.

Reactants:

C₂H₄ has one C=C bond and four C-H bonds. Total bond energy

= (1 x 614 kJ/mol) + (4 x 413 kJ/mol) = 2462 kJ/mol

H2 has one H-H bond. Total bond energy

= 1 x 436 kJ/mol = 436 kJ/mol

Products:

C₂H₆ has six C-H bonds and one C-C bond.

Total bond energy

= (6 x 413 kJ/mol) + (1 x 348 kJ/mol) = 2862 kJ/mol

Total energy = reactant energy - product energy = (2462 kJ/mol + 436 kJ/mol) - 2862 kJ/mol = 36 kJ/mol

Therefore, the total bond energy for the reaction is 36 kJ/mol.

B) The reaction is exothermic because the total energy is negative (-36 kJ/mol). This means that energy is released when the reaction occurs.

C) The formation of C-C bond releases energy (348 kJ/mol), and the breaking of C=C bond requires energy input (614 kJ/mol). The formation of four C-H bonds releases energy (4 x 413 kJ/mol = 1652 kJ/mol), and the formation of two additional C-H bonds releases more energy (2 x 413 kJ/mol = 826 kJ/mol). The breaking of one H-H bond requires energy input (436 kJ/mol).

The total energy released by the formation of new bonds is greater than the energy required to break the old bonds, resulting in an exothermic reaction.

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The periodic chart is a tabular collection of chemical elements arranged according to atomic number, starting with hydrogen and going up to oganesson, which has the greatest atomic number.

In the periodic table, also referred to as the periodic chart of the (chemical) elements, the chemical elements are organised in rows and columns. It is frequently used in physics, chemistry, and other academic fields and is widely recognised as a sign of chemistry.

This is a visual representation of the periodic law, which states that the properties of molecular elements depend approximately periodically on their atomic numbers. There are four roughly rectangular "pieces" that make up the table's top.

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The formation of two new compounds that may or may not be accompanied by color change and precipitation is a sign of a double replacement reaction.

In a double replacement reaction, two reactants exchange ions to create two new products with the same kind of chemical bonds. Typically, a precipitate is formed by one of the products. Double displacement reactions take the form:

AB + CD → AD + CB

Double replacement reactions can involve reactants with ionic or covalent bonds, but ionic molecules are more frequently involved in the kind of reaction. Double replacement reactions can involve bases and acids. The solvent is often water.

The reaction between silver nitrate and sodium chloride in water serves as an illustration of a double replacement reaction. Ionic substances include sodium chloride and silver nitrate. In aqueous solution, both reactants disperse into their ions. The sodium ion takes up the nitrate anion to make sodium nitrate, whereas the silver ion picks up the sodium's chloride ion to form silver chloride. Both of the products are ionic compounds, just like the reactants. Due to its limited solubility in water, silver chloride precipitates from solution.

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Answer:

Explanation: 2  KBr +  Cl2 --> 2KCl + Br2  (single replacement or single displacement depending on your textbook)

3 Mg  + Fe2O3  --> 3 MgO  + 2 Fe  Single replacment

Both sides have to equal each other so you need 2 in front of KBr to have 2 K and 2 Br,  you need 2 infront of KCl to have 2 of each.  Its because of the Cl2 and Br2 in the equation.

Because you have a 2 in Fe2O3 you put the 2 in front of Fe.  Because you have a 3 after the O in Fe2O3 you put a 3 in front of MgO.  Because you put the 3 in front of MgO you put a 3 in front of Mg.  

You have to have the same number before and after the -->

48.92 g of CaCO3 decomposes to produce 10.94 L of CO2 at STP.

Carbonic salt of calcium is called Calcium Carbonate.

CaCO3(s) → CaO(s) + CO2(g)

Molar mass of CaCO3 is 100.09 g/mol, so we calculate the number of moles of CaCO3 present as:

48.92 g CaCO3 ÷ 100.09 g/mol = 0.488 mol CaCO3

0.488 mol CO2 are produced

As volume of 1 mole of ideal gas at standard temperature and pressure (STP) is 22.4 L, hence we calculate volume of CO2 produced at STP as:

0.488 mol × 22.4 L/mol = 10.94 L

Therefore, 48.92 g of CaCO3 decomposes to produce 10.94 L of CO2 at STP.

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Ammonia and phosphoric acid are the reactants for the reaction 9, for the formation of Ammonium Phosphate.

What are ionic reactions?

Ionic reaction is the reaction of ions that are anions and cations to form a compound in a medium in which they are dissolved. When ions of water-soluble salts interact with each other in aqueous medium results in the formation of water-insoluble salts.

9) 3NH₃ + H₃PO₃ → (NH₄)₃PO₄

10) CaCO₃ + HCl → CaCl₂ + H₂CO₃

11) SnO₂ + HCl → SnCl₂ + H₂O

12) Ca(OH)₂ + HNO₃ → Ca(NO₃)₂ + H₂O

13) C₃H₅O(COOH)₃ + 3KOH → C₃H₅O(COOK)₃ + 3H₂O

14) 2Mg + C₃H₅O(COOH)₃ → (C₃H₅O(COO)₃)Mg₂ + H₂

15) H₃PO₄ + 3KOH → K₃PO₄ + 3H₂O

Therefore, Ammonia and phosphoric acid are the reactants for the reaction 9, for the formation of Ammonium Phosphate.

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