Chem Test Practice In Class

Elements are made of 

• many types of atoms 
• the periodic table
• one type of atom 
• molecules 

Two or more atoms chemically bonded together are called a

• atom
• element
• molecule
• mixture

What is the picture displayed?

• atom

• element molecule

• compound molecule

How many Hydrogen atoms are in Water (H2O)

• 1
• 2
• 3
• 4

Are these molecules also compounds?

• YES

• NO

A change in which NEW substances are formed.

• Chemical change
• Physical change
• Casual change
• Formal change

Ripping up paper ...

• Chemical Change
• Physical Change

An explosion occurs ...

• Chemical Change
• Physical Change

What happens when a substance undergoes a physical change?

• Some physical properties change, but the substance keeps its identity.

• No physical properties change, and the substance keeps its identity.

• Some physical properties change, and the substance changes its identity.

• No physical properties change, but the substance changes its identity.

What is an example of a physical change?

• having less ash than the paper that was burned to form it

• ice forming and then melting back into water

• rust having a different identity than the iron it forms on

• the irreversible reaction of vinegar and baking soda