Chapter 3

Question 1

What is the average mass of a molecule or formula unit?

Answer 1

Formula mass

Question 2

To calculate formula mass we find the sum of atomic masses of all atoms in the chemical ____________.

Answer 2

Formula

Question 3

The mass in grams of 1 mole of its molecules or formula units is it’s what?

Answer 3

Molar mass

Question 4

A pure compound always consist of the same elements combined in the same proportions by ________.

Answer 4

Mass

Question 5

A pure compound can express molecular composition as percent by _________.

Answer 5

Mass

Question 6

The formula showing the simplest ratio of moles of atoms of each component is what?

Answer 6

Empirical formula

Question 7

What is the formula showing the exact number of atoms of each element in a compound?

Answer 7

Molecular formula

Question 8

For the empirical formula we need a ________ number.

Answer 8

Whole

Question 9

We need to do an experiment to find the molar mass of the empirical ____________.

Answer 9

Formula

Question 10

What depicts the kinds of reactants and products and their relative amounts in a reaction?

Answer 10

Chemical equations

Question 11

The numbers in front of the chemicals of the chemical equation are called what?

Answer 11

Stoichiometric coefficients

Question 12

The letters (s), (g), and (l) in the chemical equations are the ____________ states of the compounds.

Answer 12

Physical

Question 13

Because of the principle of the conservation of mass an equation must be what?

Answer 13

Balanced