GCSE - Gcse Chemistry - Endothermic And Exothermic Reactions 1 Solution

Q.1.

In an exothermic reaction...

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energy is absorbed from the surroundings and the temperature increases
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energy is released to the surroundings and the temperature of the surroundings increases
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energy is absorbed from the surroundings and the temperature of the surroundings decreases
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energy is released to the surroundings and the temperature of the surroundings decreases

Q.2.

In an endothermic reaction...

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energy is absorbed from the surroundings and the temperature increases
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energy is released to the surroundings and the temperature of the surroundings increases
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energy is absorbed from the surroundings and the temperature of the surroundings decreases
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energy is released to the surroundings and the temperature of the surroundings decreases

Q.3.

When an exothermic reaction takes place, the reaction mixture gives out heat because...

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more energy is released when new bonds are formed than is taken in when existing bonds in the reactants are broken
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the radiation energy produced by the reaction has to be got rid of via diffusion
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energy is always absorbed in a chemical change which makes new substances
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in an exothermic change, the products are less stable than the reactants

Q.4.

When ammonium nitrate is added to water, an endothermic reaction occurs and...

Q.5.

Which of the following reactions is exothermic?

Q.6.

Where will the products be in relation to the reactants in an endothermic energy diagram?

Q.7.

Energy change in a chemical reaction is represented by the symbol...

Q.8.

ΔH is negative for what type of reactions?

Q.9.

ΔH is positive for what type of reactions?

Q.10.

Energy changes in chemical reactions are measured in...