Chemistry Review Units 1-3

Front

How many significant digits does the number 0.002020400 have?

Back

7 significant digits.

Front

What is the name of the compound LiCl?

Back

Lithium chloride.

Front

What is the variable that you measure to see a change in your experiment?

Back

Dependent variable.

Front

Which number on the diagram represents the atomic mass?

Back

15.

Front

What is an example of a physical change?

Back

Cutting a sandwich in half.

Front

Define significant digits.

Back

Significant digits are the digits in a number that contribute to its precision.

Front

What is the difference between an independent variable and a dependent variable?

Back

The independent variable is manipulated, while the dependent variable is measured.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is a chemical change?

Back

A chemical change results in the formation of new substances.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume.