Honors Chemistry Unit 2 Test Review

Front

How many days are in 72 years? (Round to appropriate significant figures)

Back

26,000 days

Front

Atoms of isotopes of an element have different numbers of _____?

Back

neutrons

Front

Which temperature scale is only used in the United States?

Back

Fahrenheit

Front

Who discovered electrons?

Back

J.J. Thomson

Front

What is an atomic mass unit?

Back

1/12 the mass of a carbon-12 atom

Front

Define isotopes.

Back

Atoms of the same element with different numbers of neutrons.

Front

What is the significance of significant figures in calculations?

Back

They indicate the precision of a measurement.

Front

Explain the difference between mass and weight.

Back

Mass is the amount of matter in an object; weight is the force exerted by gravity on that mass.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume

Front

What is the difference between Celsius and Kelvin temperature scales?

Back

Celsius is based on the freezing and boiling points of water; Kelvin is an absolute scale starting at absolute zero.