Question 1

Which of the following best describes a spontaneous reaction?

Accepted Answer

A reaction that occurs naturally under certain conditions without continuous energy input.

Question 2

Which equation represents a spontaneous process as shown in the study material?

Accepted Answer

$$\mathrm{Glucose} + 6\ \mathrm{O}_2 \rightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O}$$

Question 3

Which of the following statements is TRUE regarding spontaneity and reaction rate?

Accepted Answer

Spontaneity does not determine the speed of a reaction.

Question 4

Which process is nonspontaneous under standard conditions?

Accepted Answer

Photosynthesis in plants.

Question 5

A student places a lump of coal in air at room temperature. What can be said about the spontaneity and rate of the reaction?

Accepted Answer

The reaction is spontaneous but may occur extremely slowly.

Question 6

Which of the following best describes a nonspontaneous process?

Accepted Answer

A process that requires a constant outside energy source to proceed.

Question 7

Which of the following is an example of a spontaneous process at room temperature?

Accepted Answer

Melting of ice at 25 $$^\circC.$$

Question 8

Which of the following statements about equilibrium and spontaneity is correct?

Accepted Answer

Spontaneous reactions form products at equilibrium without continuous energy input.

Question 9

Which of the following real-life processes is spontaneous?

Accepted Answer

Rusting of iron in moist air.

Question 10

Which process is correctly matched with its spontaneity under standard conditions?

Accepted Answer

Melting of ice at 25 $$^\circC$$: spontaneous

Question 11

Which of the following best explains why photosynthesis is considered nonspontaneous?

Accepted Answer

It requires a constant input of energy from sunlight.

Question 12

Which of the following is a correct statement about the dissolution of salt in water at room temperature?

Accepted Answer

It is a spontaneous process.

Question 13

Which of the following is NOT a characteristic of a spontaneous process?

Accepted Answer

It always occurs rapidly.

Question 14

Which of the following processes is spontaneous and exothermic?

Accepted Answer

Combustion of glucose in cellular respiration.

Question 15

A chemical reaction occurs only when a constant supply of electricity is provided. This reaction is:

Accepted Answer

Nonspontaneous

Spontaneous vs. Nonspontaneous Reactions in Chemistry

Study Guide - Practice Questions