GCSE - Gcse Chemistry - Endothermic And Exothermic Reactions 2 Solution

Q.1.

Bond breaking is an...

Q.2.

Bond making is an...

Q.3.

On an energy level diagram, the products of an exothermic reaction will be...

Q.4.

Electrolysis requires energy to make it work. This means it is...

Q.5.

Thermal decomposition is...

Q.6.

If a reaction is endothermic overall, what does this tell us about the bonds broken and made during the reaction?

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There are equal amounts of energy required to break and make the bonds in the reaction
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There is a lot of energy used for both making and breaking bonds
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There is less energy used in breaking the bonds of the reactants than required to make the bonds of the products
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There is more energy used in breaking the bonds of the reactants than required to make the bonds of the products

Q.7.

Pick the correct combination of information for an exothermic reaction.

Q.8.

Neutralisation is...

Q.9.

ΔH is the energy change for the reaction. To calculate this...

Q.10.

Which of the following observations indicate an endothermic reaction?

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The temperature of the decaying grass in the compost maker was considerably above the outside temperature
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Hydrogen peroxide and hydrazine react so explosively and energetically that they are used to power rockets into space
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The mixture bubbled vigorously and the temperature dropped by 40°C
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A red glow spread through the mixture and the temperature increased by 10°C