Stogs GCSE Interleaving Energetics M

In an exothermic reaction...

• energy is taken in and the surroundings get colder.

• energy is taken in and the surroundings get warmer.

• energy is given out and the surroundings get warmer.

• energy is given out and the surroundings get colder.

To break a chemical bond...

• energy must be supplied.

• energy must be released.

Calorimetry can be used to measure the energy given off when a substance burns.

• True

• False

Which of these can be used to measure the energy change when a chemical reaction takes place?

• Change in colour.

• Change in mass.

• Change in temperature.

In an exothermic reaction, the products are at...

• a lower energy than the reactants.

• a higher energy than the reactants.

In an endothermic reaction, the energy released when bonds are formed is...

• less than the energy used in breaking old bonds.

• greater than the energy used in breaking old bonds.

The same reaction is carried out with and without a catalyst. Which line on the graph shows the reaction with a catalyst?

• Line 1

• Line 2

If a reaction mixture increases in temperature during a reaction...

• the reaction is endothermic.

• the reaction is exothermic.

• no new chemical bonds have formed.

Energy is needed in a chemical reaction to...

• break bonds.

• form new bonds.

In an endothermic reaction, the products are at...

• a lower energy than the reactants.

• a higher energy than the reactants.