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Endothermic and Exothermic Reactions 1
When ammonium nitrate is added to water, an endothermic reaction occurs and the temperature falls.

Endothermic and Exothermic Reactions 1

Endothermic and exothermic reactions transfer energy with the surroundings. This GCSE Chemistry quiz helps you spot energy changes and interpret simple reaction profiles.

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Fascinating Fact:

In an endothermic reaction, more energy is taken in to break bonds than is released when new bonds form. The overall energy change is positive.

In GCSE Chemistry, energy changes help classify reactions as endothermic or exothermic. You compare the energy of reactants and products, and you may use reaction profiles to show activation energy and overall energy transfer.

Key Terms

  • Endothermic: A reaction that takes in energy from the surroundings, often causing the temperature to fall.
  • Exothermic: A reaction that releases energy to the surroundings, often causing the temperature to rise.
  • Activation Energy: The minimum energy needed for particles to react when they collide.

Frequently Asked Questions

What is the difference between endothermic and exothermic reactions?

Endothermic reactions take in energy from the surroundings, while exothermic reactions release energy to the surroundings. You often observe this as a temperature decrease or increase.

How can you tell if a reaction is endothermic in an experiment?

A reaction is likely endothermic if the temperature of the reaction mixture falls and energy is absorbed from the surroundings, assuming no external heating is used.

What does a reaction profile show in GCSE Chemistry?

A reaction profile shows the energy change during a reaction, including the activation energy and whether products are higher or lower in energy than reactants.

Try These Related Quizzes

1 .
In an exothermic reaction...
energy is absorbed from the surroundings and the temperature increases
energy is released to the surroundings and the temperature of the surroundings increases
energy is absorbed from the surroundings and the temperature of the surroundings decreases
energy is released to the surroundings and the temperature of the surroundings decreases
In some cases this is obvious but in others it would need extremely sensitive equipment to detect the temperature rise
2 .
In an endothermic reaction...
energy is absorbed from the surroundings and the temperature increases
energy is released to the surroundings and the temperature of the surroundings increases
energy is absorbed from the surroundings and the temperature of the surroundings decreases
energy is released to the surroundings and the temperature of the surroundings decreases
You can ususally feel the decrease in temperature by touching the outside of the reaction vessel
3 .
When an exothermic reaction takes place, the reaction mixture gives out heat because...
more energy is released when new bonds are formed than is taken in when existing bonds in the reactants are broken
the radiation energy produced by the reaction has to be got rid of via diffusion
energy is always absorbed in a chemical change which makes new substances
in an exothermic change, the products are less stable than the reactants
When bonds are broken, energy is released and vice-versa
4 .
When ammonium nitrate is added to water, an endothermic reaction occurs and...
nothing changes
the temperature of the reaction mixture falls
the temperature rises
heat is given out
This is a key characteristic of endothermic reactions
5 .
Which of the following reactions is exothermic?
Photosynthesis
Combustion
Ethanoic acid + sodium carbonate
Ammonium nitrate + water
Combustion gives out large amounts of energy
6 .
Where will the products be in relation to the reactants in an endothermic energy diagram?
Lower
Higher
The same level
An energy level diagram doesn't show levels
This shows that the products of an endothermic reaction contain a greater amount of energy than the reactants i.e. energy has been taken in by the reaction mix
7 .
Energy change in a chemical reaction is represented by the symbol...
ΔE
H
ΔH
ΔT
The Ä sign is the Greek capital letter delta and means 'change in'
8 .
ΔH is negative for what type of reactions?
Endothermic
Oxidation
Displacement
Exothermic
On an energy level diagram, the energy contained in the bonds of the products is less than that of the reactants
9 .
ΔH is positive for what type of reactions?
Endothermic
Oxidation
Displacement
Exothermic
On an energy level diagram, the energy contained in the bonds of the products is greater than that of the reactants
10 .
Energy changes in chemical reactions are measured in...
Joules
kJ
kJ/mol
kWh
kJ/mol = kilojoules per mole
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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