Exothermic and Endothermic Reactions

Some chemical reactions give out or take in (a)   as heat.

• energy
• temperature

What is an exothermic reaction?

• a reaction that takes in energy from the surroundings

• a reaction that gives out energy to the surroundings

What is an endothermic reaction?

• a reaction that takes in energy from the surroundings

• a reaction that gives out energy to the surroundings

How does an exothermic reaction affect the temperature of the surroundings?

• The temperature of the surroundings increases.

• The temperature of the surroundings decreases.

How does an endothermic reaction affect the temperature of the surroundings?

• The temperature of the surroundings increases.

• The temperature of the surroundings decreases.

If an exothermic reaction was taking place in a test tube, would the test tube feel hot or cold?

• hot

• cold

If an endothermic reaction was taking place in a test tube, would the test tube feel hot or cold?

• hot

• cold

What type of reaction gives out energy?

• endothermic reaction

• exothermic reaction

What type of reaction takes in energy?

• exothermic reaction

• endothermic reaction

What holds the atoms in a molecule together?

• chemical bonds

• chemical glue