NC 8th Science 8.P.1 Review

Front

What indicates a chemical reaction has occurred when two clear solutions are mixed?

Back

An increase of volume in the beaker.

Front

Why are hydrogen peroxide (H₂O₂) and water (H₂O) different compounds?

Back

Hydrogen peroxide contains one more oxygen than water.

Front

What is a balanced chemical equation?

Back

A balanced equation has the same number of each type of atom on both sides. Example: 2H2 + O2 → 2H2O.

Front

What does a subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of that element in the compound.

Front

In a chemical reaction, if you start with 6 atoms of carbon (C), how many should be in the products?

Back

6 atoms of carbon (C).

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a reaction.

Front

What is a product in a chemical reaction?

Back

A substance that is formed as a result of a chemical reaction.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond.

Front

What is an example of a physical change?

Back

Melting ice is a physical change.