Chemistry Review 1

Front

What is density?

Back

Density is the mass of an object divided by its volume. It determines whether an object will float or sink in a fluid.

Front

If an object sinks in water, what can we conclude about its density?

Back

The object is denser than water.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, which cannot be reversed.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence includes color change, gas production, odor change, or temperature change.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Front

What is the product of the reaction 2H₂ + O₂ → ?

Back

The product is 2H₂O.

Front

What happens to particles during a chemical change?

Back

Particles rearrange to form new substances.

Front

What is the role of temperature in physical changes?

Back

Temperature changes can cause physical changes, such as melting or boiling.

Front

What is the formula for sulfuric acid?

Back

The formula for sulfuric acid is H₂SO₄.