Y8: Thermal Decomposition

• Chemistry
• Lower Secondary (Key Stage 3)

Y8: Thermal Decomposition

Match the energy stores to the descriptions.

The energy stored in hot objects.

The energy stored in objects that are stretched or compressed.

The energy stored in moving objects.

The energy stored in objects above the ground.

The energy stored in food, fuels and batteries.

Kinetic

Chemical

Thermal

Elastic

Gravitational potential

Which of these statements is NOT TRUE about combustion reactions?

1. Oxygen is a reactant
2. An oxide is produced
3. Heat is produced
4. Oxygen is produced

C+O​2​​→CO​2​​

Is this a decomposition reaction?

1. Yes
2. No

Is this a decomposition reaction?

1. Yes
2. No

Is this a decomposition reaction?

1. Yes
2. No

Is this a decomposition reaction?

1. Yes
2. No

Is this a decomposition reaction?

1. Yes
2. No

Is this a decomposition reaction?

1. Yes
2. No

Is this a decomposition reaction?

1. Yes
2. No

Is this a decomposition reaction?

1. Yes
2. No

In a decomposition reaction a compound breaks down.

1. True
2. False

Every decomposition reaction has 2 or more products.

1. True
2. False

In a decomposition reaction there is only one reactant.

1. True
2. False

In a decomposition reaction the total number of atoms of each element is the same in the reactants and products.

1. True
2. False

one

two

compound

compounds

oxide

carbon

dioxide

thermal

Y

Y

Y

Y

N

N

N

N

Explain why this is a decomposition reaction.

What type of reaction is this?

1. Decomposition
2. Combustion
3. Neither

What type of reaction is this?

1. Decomposition
2. Combustion
3. Neither

What type of reaction is this?

1. Decomposition
2. Combustion
3. Neither

What type of reaction is this?

1. Decomposition
2. Combustion
3. Neither

What type of reaction is this?

1. Decomposition
2. Combustion
3. Neither

What type of reaction is this?

1. Decomposition
2. Combustion
3. Neither

What type of reaction is this?

1. Decomposition
2. Combustion
3. Neither

What type of reaction is this?

1. Decomposition
2. Combustion
3. Neither