EOT Revision

Which of the following is/are false statement(s) about entropy?

• It is a measure or randomness of a system.

• Entropy of a gas is greater than that of a solid.

• The greater the disorder in a system, the smaller the entropy.

• Dissolving a solid in a solvent, increases the entropy of the system

• B & C

For which of the following reaction is/are there a decrease in entropy?

I) I2 (g) → I2 (s)

II) 2 O3 (g) → 3 O3 (g)

III) 2 K (s) + H2O (l) → 2 KOH (aq) + H2 (g)

• I

• II

• III

For a spontaneous exothermic reaction, which of the following statement(s) is/are true?

I) ΔG has a -ve value.

II) ΔH has a -ve value.

III) The reaction will have a decrease in entropy.

• I

• II

• III

The change in concentration of a reactant or a product per unit of time is known as _________?

An unstable arrangement of atoms that represents a transition state is known as

At a certain temperature, the equilibrium constant for the reaction: H2 +Cl2 ⇌ 2 HCl is K. The equilibrium constant for the reaction for the reaction: 1/2 H2 + 1/2 Cl2 ⇌ HCl is ______?

• K/2

• 2 

• 1/K

•  K^2

• √K

A system is at equilibrium when the rate of the forward reaction is equal to the rate of the reverse reactions.

• True

• False

A student dropped a piece of magnesium ribbon in a flask containing some hydrochloric acid at room temperature. The student observed the experiment for ten minutes but noticed that no reaction occurred. List the three Conditions that must be met for a reaction to occur.

If a process is endothermic and the process creates more order than existed before, the process is________?

• always spontaneous

• never spontaneous

• spontaneous at high temperatures

• spontaneous at low temperatures

Without consulting entropy tables, predict the sign of ΔS for the following process:

Pb(s) +Cl2(g) → PbCl2(s)

• ΔS > 0

• ΔS < 0

• ΔS = 0

• More Information is needed to make a reasonable prediction