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- 1. Multiple Choice
What happens during all endothermic changes?
A gas is produced.
Solids melt.
The temperature decreases
There is a colour change.
- 2. Multiple Choice
Solid sodium carbonate is added to vinegar in a beaker and stirred.
The water in the watch glass freezes.
Which statement about the reaction explains why the water freezes?
It is a redox reaction.
It is an endothermic reaction.
It is catalysed by sodium carbonate.
It is thermal decomposition.
- 3. Multiple Choice
Which temperature changes occur during exothermic and endothermic reactions?
A
B
C
D
- 4. Multiple Choice
The diagram shows how the temperature change is measured when magnesium powder reacts with dilute hydrochloric acid. Thermometer reading before adding magnesium powder = 20.6 °C Thermometer reading after adding magnesium powder = 32.4 °C Which statement is correct?
The reaction is endothermic and gives out heat.
The reaction is endothermic and takes in heat.
The reaction is exothermic and gives out heat.
The reaction is exothermic and takes in heat.
- 5. Multiple Choice
Which statement about chemical reactions is not correct?
A higher temperature increases the rate of an endothermic reaction.
Chemical energy is converted into thermal energy in an endothermic reaction.
Temperature decreases in an endothermic reaction and there is an increase in chemical energy.
Temperature increases in an exothermic reaction because there is an increase in thermal energy.
- 6. Multiple Choice
Methane reacts with oxygen, releasing heat. Which statement explains the energy changes in this reaction?
Chemical energy is changed into thermal energy.
Energy is made in the reaction.
The heat released increases the temperature of the surroundings.
The reaction is endothermic.
- 7. Multiple Choice
Which statement describes an exothermic reaction?
It gives out thermal energy.
It needs energy to start it.
It neither gives out nor takes in energy.
It takes in energy.
- 8. Multiple Choice
Which change must take place in an endothermic reaction?
Bubbles of gas are released.
The mass decreases.
The temperature decreases.
The temperature increase
- 9. Multiple Choice
The initial and the final temperatures of four different reactions are recorded. Which reaction is the most exothermic?
A
B
C
D
- 10. Multiple Choice
The energy level diagram for a reaction is shown.
Which statement is correct?
X is the energy change of the reaction.
Y is the activation energy of the reaction.
The energy change of the reaction is larger than the activation energy of the reaction.
The reaction is exothermic.
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