chem.

Is ice melting a chemical or physical change?

• physical
• chemical
• radiation 
• all of the above

What happens when metal is rusting?

• It evaporates.
• A physical change happens.
• Nothing happens.
• A chemical change happens.

How many elements are there in the periodic table?

• 24
• 12
• 118
• 34

What is a chemical change?

• A new substance is formed.
• The odor changes.
• The color changes.
• all of the above.

Ripping paper IS A chemical change.

• True
• False

Do all chemical reactions occur at the same rate?

• mabye
• yes
• no
• none of the above.

Why can't we see a chemical reaction?

• because they occur at an atomic level.
• because they happen to fast
• because they are boring. 
• no reason.

Is fire igniting oil a chemical reaction?

• yes.
• no.
• mabye.
• all of the above.

 Fire can cause a chemical reaction.

• True
• fase

Witch one is a chemical reaction?

• wood burning.
• A car exploding.
• water putting fire out.
• all of the above.