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Endothermic and Exothermic Reactions 2
Glow sticks are applications of exothermic reactions.

Endothermic and Exothermic Reactions 2

Endothermic and exothermic reactions also link to reversible reactions and equilibrium. This GCSE Chemistry quiz helps you predict how temperature changes affect the position of equilibrium.

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Fascinating Fact:

Reversible reactions can be exothermic in one direction and endothermic in the other. Changing temperature can shift the position of equilibrium.

In GCSE Chemistry, reversible reactions reach a dynamic equilibrium in a closed system when forward and reverse reactions happen at the same rate. Temperature changes can favour the endothermic or exothermic direction, shifting the equilibrium position and changing the amounts of reactants and products.

Key Terms

  • Reversible Reaction: A reaction where products can react to form the original reactants, shown with a double arrow.
  • Dynamic Equilibrium: When forward and reverse reactions occur at the same rate, so overall amounts stay constant in a closed system.
  • Closed System: A setup where reactants and products cannot enter or leave, allowing equilibrium to be established.

Frequently Asked Questions

How does temperature affect equilibrium in GCSE Chemistry?

Temperature affects equilibrium by favouring the endothermic direction when temperature increases and favouring the exothermic direction when temperature decreases, shifting the equilibrium position.

What does dynamic equilibrium mean in a reversible reaction?

Dynamic equilibrium means the forward and reverse reactions continue happening, but at the same rate, so the concentrations of reactants and products stay constant in a closed system.

Why do reversible reactions need a closed system to reach equilibrium?

A closed system is needed because if products escape or reactants enter, the concentrations keep changing, so the forward and reverse reaction rates cannot balance to form equilibrium.

Try These Related Quizzes

1 .
Neutralisation is...
an endothermic reaction
a physical reaction
an exothermic reaction
an oxidation reaction
The temperature of the products of a neutralisation reaction is higher than the temperature of the reactants
2 .
ΔH is the energy change for the reaction. To calculate this...
add the reactants' energy to the products' energy
subtract the reactants' energy from the products' energy
divide the reactants' energy by the products' energy
subtract the products' energy from the reactants' energy
Products - reactants is +ve for endothermic reactions and -ve for exothermic reactions
3 .
Bond making is an...
endothermic process
exothermic process
exciting process
eltothermic process
Energy is given out when bonds are formed
4 .
Bond breaking is an...
endothermic process
exothermic process
exciting process
eltothermic process
Energy is required to break bonds
5 .
Electrolysis requires energy to make it work. This means it is...
an endothermic reaction
an exothermic reaction
an eltothermic reaction
a chemical reaction
Electrolysis requires a supply of electrical energy from a DC circuit
6 .
Thermal decomposition is...
an exothermic reaction
an endothermic reaction
a common reaction
an energy rich reaction
Thermal decomposition requires heat energy to break substances down
7 .
Pick the correct combination of information for an exothermic reaction.
°C ↑ ΔH +ve
°C ↑ ΔH -ve
°C ↓ ΔH +ve
°C ↓ ΔH -ve
ÄH is the symbol used to represent the energy change
8 .
On an energy level diagram, the products of an exothermic reaction will be...
higher than the reactants
the same level as the reactants
on a different diagram to the reactants
lower than the reactants
This shows us that the products have less energy than the reactants, because energy has been transferred to the surroundings
9 .
Which of the following observations indicate an endothermic reaction?
The temperature of the decaying grass in the compost maker was considerably above the outside temperature
Hydrogen peroxide and hydrazine react so explosively and energetically that they are used to power rockets into space
The mixture bubbled vigorously and the temperature dropped by 40°C
A red glow spread through the mixture and the temperature increased by 10°C
It is not so much the bubbling that shows this is endothermic, that can happen in exothermic reactions, but rather the temperature drop. That indicates that heat energy has been lost from the reacting mixture
10 .
If a reaction is endothermic overall, what does this tell us about the bonds broken and made during the reaction?
There are equal amounts of energy required to break and make the bonds in the reaction
There is a lot of energy used for both making and breaking bonds
There is less energy used in breaking the bonds of the reactants than required to make the bonds of the products
There is more energy used in breaking the bonds of the reactants than required to make the bonds of the products
Remember, energy changes in chemical reactions are all about bond breaking and bond making
You can find more about this topic by visiting BBC Bitesize - Exothermic and endothermic reactions

Author:  Kate Gardiner (Chemistry Educator & GCSE Quiz Writer)
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