7.2 Heat Energy Changes in Chemical Reactions

No description yet. This curated deck is ready for daily study.

Total cards: 22•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (22)

Front (Question)

Exothermic reaction

Back (Answer)

A reaction which gives out energy to the surroundings

Front (Question)

Explain how to spot an exothermic reaction

Back (Answer)

Exothermic reactions normally give out energy in the form of heat so there is a rise in temperature of the surroundings

Front (Question)

Endothermic reaction

Back (Answer)

A reaction which takes in energy

Front (Question)

Explain how to spot an endothermic reaction

Back (Answer)

Energy is normally taken in in the form of heat which causes a fall in temperature of the surroundings

Front (Question)

What can you use to show if a reaction is exothermic or endothermic

Back (Answer)

Reaction profiles

Front (Question)

Reaction profile of an exothermic reaction

Back (Answer)

Reactants have a higher energy than the products

Front (Question)

Reaction profile of an endothermic reaction

Back (Answer)

Reactants have lower energy than products

Front (Question)

What is the curve in a reaction profile

Back (Answer)

Activation energy

Front (Question)

Experiment to calculate the change in temperature of a reaction

Back (Answer)

1- Put a polystyrene cup into a large beaker of cotton wool. Add a known volume of your first reagent to the cup. Measure the initial temperature with a temperature probe. Then add your second reagent. 2- Put a lid on the cup 3- Record the maximum/minimum temperature and calculate the temperature change

#10

Front (Question)

Why is cotton wool added to the beaker in the energy change experiment

Back (Answer)

To give insulation to help limit energy transfer

#11

Front (Question)

Why should a lid be placed on the beaker in the energy change experiment

Back (Answer)

To reduce any energy lost by evaporation

#12

Front (Question)

Is breaking bonds exothermic or endothermic

Back (Answer)

Endothermic

#13

Front (Question)

Is making bonds exothermic or endothermic

Back (Answer)

Exothermic

#14

Front (Question)

Is dissolving salts in water exothermic or endothermic

Back (Answer)

It depends on the reactants used

#15

Front (Question)

Is dissolving ammonium choride in water exothermic or endothermic

Back (Answer)

Endothermic

#16

Front (Question)

Is dissolving calcium chloride in water endothermic or exothermic

Back (Answer)

Exothermic

#17

Front (Question)

Is a neutralisation reaction exothermic or endothermic

Back (Answer)

Mostly exothermic

#18

Front (Question)

State a neutralisation reaction which is endothermic

Back (Answer)

Ethanoic acid and sodium carbonate

#19

Front (Question)

Are displacement reactions exothermic or endothermic

Back (Answer)

Exothermic

#20

Front (Question)

Are precipitation reactions exothermic or endothermic

Back (Answer)

Exothermic

#21

Front (Question)

What does a positive energy change mean

Back (Answer)

The reaction is endothermic

#22

Front (Question)

What does a negative energy change mean

Back (Answer)

The reaction is exothermic