Decomposition reactions

Question 1

What is a decomposition reaction?

Answer 1

A reaction where a single compound breaks down into two or more simpler substances.

Question 2

True or False: Decomposition reactions always require heat.

Answer 2

False

Question 3

Fill in the blank: The general equation for a decomposition reaction is AB → ____ + ____.

Answer 3

A + B

Question 4

What type of energy is often required to initiate a decomposition reaction?

Answer 4

Heat, light, or electricity

Question 5

Give an example of a thermal decomposition reaction.

Answer 5

Decomposition of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2) when heated.

Question 6

What is electrolysis?

Answer 6

A decomposition reaction driven by an electric current.

Question 7

Multiple Choice: Which of the following is a decomposition reaction? A) 2H2 + O2 → 2H2O B) CaCO3 → CaO + CO2 C) NaCl + AgNO3 → NaNO3 + AgCl

Answer 7

B) CaCO3 → CaO + CO2

Question 8

True or False: Decomposition reactions can only produce elements.

Answer 8

False

Question 9

What is the process of breaking down hydrogen peroxide (H2O2) into water and oxygen called?

Answer 9

Decomposition reaction

Question 10

Fill in the blank: Decomposition reactions can be classified into _____ types.

Answer 10

three

Question 11

What are the three types of decomposition reactions?

Answer 11

Thermal, electrolytic, and photolytic

Question 12

What is a photolytic decomposition reaction?

Answer 12

A reaction where light energy causes a compound to decompose.

Question 13

Give a real-world example of a photolytic decomposition reaction.

Answer 13

Decomposition of silver chloride (AgCl) in sunlight.

Question 14

True or False: All decomposition reactions are endothermic.

Answer 14

False

Question 15

What does it mean if a decomposition reaction is endothermic?

Answer 15

It absorbs heat from the surroundings.

Question 16

Multiple Choice: Which of the following is NOT a product of the decomposition of water? A) Hydrogen B) Oxygen C) Carbon D) None of the above

Answer 16

C) Carbon

Question 17

What is the role of a catalyst in a decomposition reaction?

Answer 17

It speeds up the reaction without being consumed.

Question 18

Fill in the blank: The decomposition of ammonium dichromate produces chromium(III) oxide, nitrogen gas, and _____.

Answer 18

water

Question 19

What is the significance of decomposition reactions in the environment?

Answer 19

They are crucial for recycling nutrients and breaking down organic matter.

Question 20

True or False: Decomposition reactions can only occur in laboratory settings.

Answer 20

False

Question 21

What happens during the decomposition of organic matter?

Answer 21

Microorganisms break down complex organic compounds into simpler substances.

Question 22

Multiple Choice: Which of the following is a common use of decomposition reactions? A) Combustion B) Fertilizer production C) Food preservation

Answer 22

B) Fertilizer production

Question 23

What is a common household product that undergoes a decomposition reaction?

Answer 23

Baking soda (sodium bicarbonate) when heated.

Question 24

Fill in the blank: The decomposition of sodium bicarbonate produces sodium carbonate, _____, and _____ when heated.

Answer 24

water, carbon dioxide

Question 25

What is the chemical equation for the thermal decomposition of potassium chlorate?

Answer 25

2KClO3 → 2KCl + 3O2

Question 26

True or False: Decomposition reactions can be spontaneous.

Answer 26

True