TWO HYDROGEN ATOMS COMBINE TO FORM HELIUM ATOMS RESULTING IN THE FORMATION OF...

The empirical formula of polyethylene can be determined by converting the given percentages of carbon (C) and hydrogen (H) into grams. To find the grams of each element, we assume a 100.0 g sample of polyethylene.

For carbon:

Mass of carbon = 86.0% × 100.0 g = 86.0 g

For hydrogen:

Mass of hydrogen = 14.0% × 100.0 g = 14.0 g

Therefore, in a 100.0 g sample of polyethylene, there are 86.0 grams of carbon and 14.0 grams of hydrogen.

The empirical formula of a compound represents the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula, we need to find the ratio of carbon to hydrogen in terms of moles.

First, we convert the masses of carbon and hydrogen into moles using their respective molar masses. The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of hydrogen is approximately 1.008 g/mol.

Number of moles of carbon = 86.0 g / 12.01 g/mol ≈ 7.162 mol

Number of moles of hydrogen = 14.0 g / 1.008 g/mol ≈ 13.89 mol

Next, we divide the number of moles of each element by the smallest number of moles to get a simplified ratio.

Carbon: Hydrogen ≈ 7.162 mol : 13.89 mol ≈ 1 : 1.939

Since we want to express the ratio in whole numbers, we multiply both sides by 2 to get a whole number ratio.

Carbon: Hydrogen ≈ 2 : 3.878

Rounding to the nearest whole number, we find that the empirical formula of polyethylene is CH₂.

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Answer:

Carbon dioxide and water I believe because it is a combustion reaction

Answer:

It would most likely just change their color

Explanation: The frequency of dark-coloured moths increased at that time, an example of industrial melanism. Later, when pollution was reduced, the light-coloured form again predominated. ... The dark-coloured or melanic form of the peppered moth

If pollution near factories was reduced, then this situation increased the frequency of white moths.

Industrial melanism is an evolutionary feature associated with the increase of dark moths in industrial polluted areas.

In conclusion, if pollution near factories was reduced, then this situation increased the frequency of white moths.

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Answer:

Fe(s) + Cu^2+(aq) ---> Fe^2+(aq) + Cu(s)

Explanation:

The ionic equation shows the actual reaction that took place. It excludes the spectator ions. Spectator ions are ions that do not really participate in the reaction even though they are present in the system.

For the reaction between iron and copper II nitrate, the molecular reaction equation is;

Fe(s) + Cu(NO3)2(aq)----> Fe(NO3)2(aq) +Cu(s)

Ionically;

Fe(s) + Cu^2+(aq) ---> Fe^2+(aq) + Cu(s)

In 4.38 × 10^21 molecules of water, there are approximately 0.073 moles.

To calculate the number of moles, we can use Avogadro's number, which states that 1 mole of a substance contains 6.022 × 10^23 molecules. So, by dividing the given number of molecules (4.38 × 10^21) by Avogadro's number, we can find the number of moles.

Now, let's explain the process in detail. Avogadro's number is a constant that represents the number of particles (atoms, molecules, etc.) in one mole of a substance. It is approximately 6.022 × 10^23. Therefore, if we divide the given number of molecules by Avogadro's number, we can determine the number of moles.

In this case, we divide 4.38 × 10^21 molecules by 6.022 × 10^23 molecules/mole, resulting in approximately 0.073 moles.

Significant figures play an important role in reporting the answer. The given number of molecules has three significant figures (4, 3, and 8), so our answer should be reported with three significant figures as well. Therefore, the number of moles is approximately 0.073.

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The value of S2 is S₂ = 2.1 g/L.Approximately 2.1 g of the gas will dissolve in 2 L of water at 0.6 ATM, assuming the temperature remains constant.

To determine the amount of gas that will dissolve in 2 L of water at 0.6 ATM, we can use Henry's law, which states that the solubility of a gas is directly proportional to the partial pressure of the gas above the liquid.

According to Henry's law, the solubility of a gas can be represented as:S₁/P₁ = S₂/P₂,,where S₁ and S₂ are the solubilities of the gas at the respective pressures P₁ and P₂.Given that 7 g of the gas dissolves in 1 L of water at 2.0 ATM, we can consider this as our initial condition, denoted by S₁/P₁.

Now, we need to find the solubility at 0.6 ATM in 2 L of water, denoted by S₂/P₂.Since the temperature remains constant, we can assume that the solubility of the gas does not change. Therefore, we can rewrite the equation as:

S₁/P₁ = S₂/P₂,

Substituting the known values, we have:

(7 g/1 L)/(2.0 ATM) = S₂/(0.6 ATM),

Solving for S₂, we get:

S₂ = (7 g/1 L) * (0.6 ATM)/(2.0 ATM),

S₂ = 2.1 g/L.

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Answer:

a. Beryllium,

b. Nitrogen

Explanation:

Most similar to strontium is beryllium, they both are in the 2d group.

Least similar to strontium  is nitrogen. Strontium is a metal in the 2d group, Nitrogen is non-metal in the 15th group

Answer:

B. Zinc burns in the air.

Explanation:

A chemical property of an element is known as the property of that specific element that is apparent or visible when the element has gone through a chemical reaction with other substances or elements under investigation.

In this case, the correct answer is option B which is " Zinc burns in the air" because it shows zinc to react chemically with air which then changes its properties.

The others are just physical properties of zinc

Answer: The four main components of the earth system may be described briefly in the ... as energy is transformed from one form to another in performing work, heat is ... of solar radiation received (and re-emitted) at different points on the earth's surface. ... In general, cycles occur in closed systems; at the global scale, many systems

Explanation:

Explanation:

filling air inside an empty o2 medal containers, if air is added, the air inside, creates volume inside.

due to heat, weather,... depending on what indoor or outdoor storage said containers r placed in,;

So, I can't give you an answer, due to lack of details..sorry...

Answer:

0.10 amps

Explanation:

Answer:

In the basic version, students learn about the atom, its structure, the particles. ... They will also learn how to calculate the atomic mass and find the number of protons, neutrons, and electrons. In the advanced version, students learn about isotopes and ions.

Answer:

1.Consists of solid rock

Explanation:

Answer:

The answer would be A. Consists of solid rock

(a) Van der Waal's forces. Van der Waal's forces are weak electrostatic interactions between non-polar molecules.

These weak forces arise from the fluctuating dipoles within the molecules, which cause temporary charges to develop and attract each other. This attraction leads to the formation of weak intermolecular bonds, which are mainly responsible for the attraction between non-polar molecules. These forces are weak in comparison to other intermolecular forces, such as hydrogen bonding and ionic bonds, but are still important for the stability of non-polar molecules and their ability to dissolve in other non-polar solvents.Van der Waals forces are attractive intermolecular forces between molecules caused by the fluctuating dipole moments of molecules.

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complete question:The attraction that non-polar molecules have for each other is primarily caused by —

(a) Van der Waal's forces (b) Difference in electronegativities

(c) Hydrogen bonding (d) High ionisation energy​

0.6 is the equilibrium constant for the given reaction.

To calculate the equilibrium constant (K) for the given reaction, we need to use the molar concentrations of the reactants and products at equilibrium. The equilibrium constant expression is given by:

\(K= [H_{2}O]^{2} / ([H_{2}^{2} * [O_{2}])\)

Given the moles of H2, O2, and H2O in the 8.1 L container, we can convert them to molar concentrations by dividing the number of moles by the volume:

[H2] = 1.83 moles / 8.1 L

[O2] = 2.33 moles / 8.1 L

[H2O] = 3.95 moles / 8.1 L

Substituting these values into the equilibrium constant expression, we have:

K = \((3.95 / 8.1)^{2}\) / (\((1.83 / 8.1)^{2}\) * (2.33 / 8.1))

Evaluating this expression and rounding to one decimal place, we find the equilibrium constant to be:

K ≈ 0.6

Therefore, the equilibrium constant for the given reaction is approximately 0.6.

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Answer:

~ 3.5 x 10^21

Explanation:

Mole weight of Ca Cl2   ( from periodic table ) = ~~ 111 gm

.645 gm / 111 gm / mole   X  6.022 x 10^23  =

We need 10.7 g of KClO3 to produce 6.5 g of KCl. Protons and neutrons have approximately the same mass, which is about 1 amu, so the atomic mass of an element is roughly the sum of the number of protons and neutrons in its nucleus.

What is Atomic Mass?

Atomic mass is the mass of an atom of a chemical element. It is usually expressed in atomic mass units (amu) or in grams per mole (g/mol). The atomic mass of an element is determined by the number of protons and neutrons in the nucleus of an atom.

The balanced chemical equation for the reaction of KClO3 producing KCl is:

2KClO3 → 2KCl + 3O2

We can see from the equation that 2 moles of KClO3 produce 2 moles of KCl. We need to calculate how many moles of KCl are produced from 6.5g of KCl, and then use the mole ratio to find the amount of KClO3 needed.

First, we need to convert the mass of KCl to moles:

moles of KCl = mass of KCl / molar mass of KCl

= 6.5g / 74.55 g/mol

= 0.0872 mol

From the balanced equation, we know that 2 moles of KClO3 produce 2 moles of KCl. Therefore, to find the moles of KClO3 needed to produce 0.0872 mol of KCl, we can use the following proportion:

2 mol KClO3 / 2 mol KCl = x mol KClO3 / 0.0872 mol KCl

Solving for x, we get:

x = 0.0872 mol KClO3 x (2 mol KClO3 / 2 mol KCl)

= 0.0872 mol KClO3

Finally, we can convert the moles of KClO3 to grams using its molar mass:

mass of KClO3 = moles of KClO3 x molar mass of KClO3

= 0.0872 mol x 122.55 g/mol

= 10.7 g

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Answer:

can only be determined experimentally.

Explanation:

In the early days of inorganic chemistry, the structure of complex ions remained a mystery hence the name ''complex''.

These ions appear to have structures that defied accurate elucidation. However, by diligent laboratory investigation, Alfred Werner was able to accurately determine the structure of cobalt complexes. As a result of this, he is regarded as a pathfinder in coordination chemistry.

Hence, the structure of complex ions can only be determined experimentally.

Answer:

c. can only be determined experimentally

Explanation:

It is not possible to know for certain the structure of a complex ion on the basis of stoichiometry or by the electrical charges on the components. The structure of the resulting complex ion can only be known by experiment.

Answer:

4 millllllermeeters jb

Answer:

Explanation:

a) AgCl(s) in 0.025 M NaCl

Equation:  AgCl(s) ⇄ Ag⁺ (aq) + Cl⁻ (aq)

Initial conc :    S            O               O

equili conc :    O            S                S

                  NaCl(s) ⇒ Na⁺ (aq) + Cl⁻ (aq)

Initial conc :  0.025      0           0

equili conc :     0          0.025    0.025

Therefore the concentration:  Ag⁺ = 6.4 * 10^-9 M,  Cl⁻  = 0.025 M

attached below is the detailed solution of the

Answer: soil

Explanation:

Soil is composed of various substances in varying proportion.

An example of a heterogeneous mixture is soil as it composed of different phases while all the other 3 substances are composed of single phase.

Heterogeneous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogeneous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogeneous mixtures are distinctly visible . There are two types of heterogeneous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.

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The letter A represents the dispersion forces as a kind of intermolecular force. Option A

We know that a concept map can be regarded as the framework that is used to be able to organize  facts and then be able to pass across an information. Thus a concept map is a tool that helps in the explanation of facts.

Given that we can see from the concept map that the compound is not composed of ions and there are no permanent dipoles that can be seen in the molecule, the simple meaning is that there is no kind of intermolecular interaction that involves the attraction of the oppositely charged ions in the compound and this would correspond to the dispersion forces.

In this kind of dipole attraction, it is the intermittent shifts in the electron cloud that leads to the attraction.

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The response that includes all the items listed below that are pure substances is: B. 2, 4.

In chemistry, a substance is a type of matter that has a specific composition and distinct chemical and physical properties. It is a form of matter that cannot be separated into other types of matter by physical means, such as filtration or distillation. A substance can be either an element or a compound. An element is a type of substance made up of only one type of atom, such as gold, oxygen, or carbon. A compound, on the other hand, is a substance made up of two or more different elements that are chemically combined in a fixed ratio, such as water or carbon dioxide.

Here,

Both steam and oxygen are pure substances. Steam is composed of water molecules, which are a compound with the chemical formula H2O. Oxygen is an element and is composed of molecules with the chemical symbol O2.

Orange juice, ocean water, and vegetable soup are not pure substances because they are mixtures of different compounds and/or elements. Orange juice is a mixture of water, sugars, acids, and other compounds found in oranges. Ocean water is a mixture of water, salts, and other dissolved substances. Vegetable soup is a mixture of water, vegetables, and other ingredients.

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The word equation is;

Two molecules of potassium + 2 molecules of water ---> 2 molecules of potassium hydroxide + one molecule of hydrogen

A word equation is a way of representing a chemical reaction using words instead of chemical symbols and equations. It describes the reactants and products of a chemical reaction using their names or common terms, and indicates the physical states and any conditions required for the reaction to occur.

However, word equations can be useful for understanding the basic concepts of chemical reactions and for communicating them in a simple and understandable way.

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Answer:

the emission or transmission of energy in the form of waves or particles through space or through a material medium.

The volume of the gas at STP would be 23.93 liters.

The volume of gas at STP (Standard Temperature and Pressure), we need to use the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature. First, we need to calculate the number of moles of gas in the initial sample. We can use the formula n = PV/RT, where P is the initial pressure, V is the initial volume, R is the gas constant, and T is the initial temperature.
n = (2.31 atm) x (25.15 L) / [(0.0821 L atm/mol K) x (201 + 273.15 K)]
n = 1.067 moles

Now, we can use the molar volume of gas at STP, which is 22.4 L/mol, to calculate the volume of gas at STP.
V = n x 22.4 L/mol
V = 1.067 moles x 22.4 L/mol
V = 23.93 L
Therefore, the volume of the gas at STP would be 23.93 liters.

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There are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

To determine the number of water molecules in the given volume of water, we need to use the relationship between mass, volume, and molar mass of water.

First, we need to find the mass of water in the bottle:

Mass = Density * Volume

Mass = 0.967 g/mL * 499.8 mL = 483.9 g

Next, we need to convert the mass of water to moles using the molar mass of water. The molar mass of water (H2O) is approximately 18.015 g/mol.

Moles = Mass / Molar mass

Moles = 483.9 g / 18.015 g/mol = 26.88 mol

Finally, we can calculate the number of water molecules using Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules = Moles * Avogadro's number

Number of molecules = 26.88 mol * (6.022 x 10^23 molecules/mol) = 1.62 x 10^25 molecules

Therefore, there are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

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