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Chemistry

2 answers:

ad-work [718]4 years ago

6 0

Answer: Option (d) is the correct answer.

Explanation:

Kinetic energy is defined as the energy obtained by an object due to its motion.

It is known that in a gas, particles move rapidly from one place to another. Hence, molecules of a gas will have high kinetic energy.

So, when there is decrease in kinetic energy of particles of a gas then the particles will come closer to each other and force of attraction between them increases resulting into liquid form.

Thus, we can conclude that the statement they move more slowly, causing the forces of attraction holding them together to increase, resulting in a liquid best explains what happens when the kinetic energy of particles in a gas state decreases.

Nadusha1986 [10]4 years ago

3 0

The correct answer among the choices presented above is the last option. When the kinetic energy of particles in a gas decreases, the particles<span> move more slowly, causing the forces of attraction holding them together to increase, resulting in a liquid.</span>

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$\rm {Cr_2O_7}^{2-} + 6 \; Fe^{2+} + \underbrace{\rm 14\; H^{+}}_{\text{From}\atop \text{Acid}}\to 2\; Cr^{3+} + 6\; Fe^{3+} + 7\; H_2 O$ .

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Consider the oxidation state on each of the element:

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Each Fe atom: increases by 1 (oxidation).

Changes in oxidation states shall balance each other in redox reactions. Thus, for each Cr atom on the left-hand side, there need to be three Fe atoms.

Assume that the coefficient of the most complex species $\rm Cr_2O_7^{2-}$ is 1. There will be two Cr atoms and hence six Fe atoms on the left-hand side. Additionally, there are going to be seven O atoms.

Atoms are conserved in chemical reactions. As a result, the right-hand side of this equation will contain

two Cr atoms,
six Fe atoms, and
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O atoms seldom appear among the products in acidic environments; they rapidly combine with $\rm H^{+}$ ions to produce water $\rm H_2O$ . Seven O atoms will make seven water molecules. That's fourteen H atoms and hence fourteen $\rm H^{+}$ ions on the product side of this equation. Hence the balanced equation. Double check to ensure that the charges on the ions also balance.