Evidence of Chemical Reactions/density review

Front

What is density?

Back

Density is the mass of a substance divided by its volume, usually expressed in grams per cubic centimeter (g/cm³).

Front

Why do some substances float on water?

Back

Substances float on water because they are less dense than water.

Front

What happens to air molecules when they are heated?

Back

When air molecules are heated, they separate and move apart.

Front

What is evidence of a chemical reaction?

Back

Evidence of a chemical reaction includes signs that a new substance has formed.

Front

How do you calculate density?

Back

Density = Mass / Volume.

Front

If a rock has a mass of 14 g and a volume of 2 cm³, what is its density?

Back

7 g/cm³.

Front

What is the volume of an object that displaces 6.0 ml of water?

Back

The volume of the object is 6.0 ml.

Front

What is a chemical reaction?

Back

A chemical reaction is a process where substances (reactants) are transformed into new substances (products).

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.