AQA GCSE Chemistry 4.5 Energy changes overview quiz quiz

It increases

It decreases

It stays the same

It first rises then falls

Combustion of methane in a plentiful supply of air

Thermal decomposition of a carbonate

Neutralisation

A self-heating hand warmer

Higher in energy than the reactants

At the same energy as the reactants

Lower in energy than the reactants

Above the activation energy

The energy released when a reaction finishes

The overall difference in energy between the reactants and the products

The energy stored in the products

The minimum energy colliding particles need for a reaction to occur

It lowers the activation energy by providing an alternative pathway

It raises the activation energy

It lowers the energy of the products

It increases the overall energy change of the whole reaction profile

Exothermic, because energy is released as bonds break

Endothermic, because energy must be supplied

Neither, no energy is involved

It depends on the temperature

Bonds made minus bonds broken

Bonds broken plus bonds made

Bonds broken minus bonds made

Bonds made divided by bonds broken

$+200$ kJ

$+3800$ kJ

$-3800$ kJ

$-200$ kJ

The reaction is endothermic

The reaction is exothermic

No reaction occurs

The reaction needs a catalyst

To speed up the reaction

To reduce heat loss and give more accurate results

To force the reaction to become exothermic instead of endothermic

To measure the volume of gas

A sports injury cold pack

A fridge

A self-heating hand warmer

An endothermic instant cooler

The overall energy change

The energy of the products

The mass of the reactants

The activation energy