Biology S1 Exam Review set 3

Front

Units of measurement that are combinations of SI units are called __________ units.

Back

Derived units.

Front

What is the formula to calculate density?

Back

Density = Mass/Volume.

Front

One gallon (3785 mL) of gasoline has a mass of 2540 g. What is the density of gasoline?

Back

0.671 g/mL.

Front

The number of protons in an atom’s nucleus is its __________.

Back

Atomic number.

Front

Who was the first to refer to matter as being made of discrete particles?

Back

Democritus.

Front

In atomic notation, Z represents the number of __________ in an atom.

Back

Protons.

Front

What is the atomic mass of an element?

Back

The weighted average mass of an element's isotopes.

Front

What is the difference between mass and weight?

Back

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

Front

What is an isotope?

Back

Atoms of the same element with different numbers of neutrons.

Front

What does the term 'molar mass' refer to?

Back

The mass of one mole of a substance, usually expressed in grams per mole (g/mol).