IGCSE Chemistry - Energy Changes

What is an exothermic reaction?

• A chemical reaction that increases in temperature.

• A chemical reaction that decreases in temperature.

• A chemical reaction that causes a decrease in temperature.

• Something that involves your spine.

What is an endothermic reaction?

• A chemical reaction that causes an increase in temperature.

• A chemical reaction that causes a decrease in temperature.

• A chemical reaction that heats up.

• A chemical reaction that cools down.

Which processes are done in endothermic and exothermic reactions?

• Bond breaking: Endothermic / Bond forming: Exothermic

• Bond breaking: Exothermic / Bond forming: Endothermic

• Both are bond breaking processes

• Both are bond forming processes

Is the ΔH positive or negative here?

• Positive

• Negative

True or false: Endothermic reactions give out energy.

• True

• False

True or False: Endothermic reactions take in energy.

• True

• False

True or false: Exothermic reactions give out energy.

• True

• False

Is the ΔH positive or negative here?

• Positive

• Negative