Exothermic and endothermic

What is an exothermic reaction? A reaction in which...

• thermal energy is set free.

• thermal and light energy are set free.

• thermal energy is needed.

• thermal and light energy are needed.

What is an endothermic reaction? A reaction in which...

• light energy is set free.

• light and heat are set free.

• light is needed.

• heat is needed.

What is activation energy? The energy needed to...

• start an exothermic reaction.

• start an endothermic reaction.

• make a reaction stop.

• make something glow.

What is an oxidation? A reaction with...

• nitrogen.

• carbon dioxide

• oxygen

• fire

When something burns, it always reacts with...

• nitrogen

• oxygen

• carbon dioxide

• hydrogen

When a candle burns, this is

• an exothermic reaction.

• an endothermic reaction.

• an oxidation.

• none of these

When fireworks explode, this is...

• an oxidation.

• an exothermic reaction.

• an endothermic reaction.

• none of these.

When a toast is toasted, it is...

• an endothermic reaction.

• an exothermic reaction.

• a chemical reaction.

• a physical change.

To see if something contains (enthalten) carbon dioxide, you do this test:

• glowing splint test.

• lime water test.

• silver nitrate.

• squeaky pop test.

What do you see in the lime water test when there is no carbon dioxide? The water turns...

• brown

• cloudy

• yellow

• green