Matter and Energy Practice

1) Dynamite explodes in the destruction of a building

• exothermic
• endothermic

2) An ice cube melts (the ice cube needs to use/absorb energy for this to happen)

• exothermic
• endothermic

3) Two substances react and the temperature goes from 25 degrees celsius to 12 degrees celsius

• exothermic
• endothermic

4) Two substances react and the temperature goes from 25 degrees celsius to 40 degrees celsius

• exothermic
• endothermic

5) 2 grams of salt is mixed into 10 grams of water. How many grams will the mixture be?

6) 5 grams of magnesium is reacts with 5 grams of oxygen. How many grams of magnesium oxide will be produced?

5) A chemical reaction occurs and the temperature decreases from 30 degrees celsius to 15 degrees celsius

• exothermic

• endothermic

6) A piece of metal is heated and it glows red hot

• exothermic

• endothermic

7) Water vapor condenses into liquid water on a cold surface

• exothermic

• endothermic