Chemical Changes Revision

Burning wood is a

• chemical change

• physical change

Melting butter for popcorn is a

• chemical change

• physical change

Salt dissolved in water is a

• physical change

• chemical change

What does it mean when there is a physical change?

• Matter has change from one substance into another.

• Matter has change on the molecular level

• A new substance has been formed.

• Matter has changed size, shape or form.

A cup of water is left outside for two days. When it was checked there was only half a cup left. What happened?

• evaporation; chemical change

• condensation; physical change

• evaporation; physical change

• condensation; chemical change

Complete the following word equation:
metal + acid  $\rightarrow$  

• salt + water

• salt + hydrogen

• salt + water + carbon dioxide

Complete the following word equation:
metal carbonate + acid  $\rightarrow$  

• salt + hydrogen

• salt + water + carbon Dioxide

• salt + water

What products are produced when we react an acid with an alkali?

• salt + carbon dioxide + water
• salt + hydrogen
• salt + water
• salt + water + hydrogen

Salts that are made with hydrochloric acid are called ______________.

• chlorides
• sulfates
• nitrates
• carbonates

Salts that are made with nitric acid are called ______________.

• chlorides
• sulfates
• nitrates
• carbonates