IGCSE Exothermic and Endothermic Reactions

What term is given to a reaction that releases heat energy to the surroundings?

• ectothermic

• endothermic

• exothermic

• ecstatic

Which is an example of an exothermic reaction?

• photosynthesis

• melting

• electrolysis

• burning

When magnesium reacts with acid, the temperature rises from 25°C to 51°C. This shows that the reaction is

• ectothermic

• endothermic

• exothermic

• ecstatic

In this energy profile, the products have a ................ energy level than the reactants. Therefore, this is an ............ reaction.

• higher.....exothermic

• lower..... exothermic

• higher.....endothermic

• lower..... endothermic

How do we know that this represents an exothermic reaction?

• The products have more energy than the reactants

• The products have less energy than the reactants.

Which is wrongly labelled?

• reactants

• products

• overall energy change

• activation energy