Module #5: Counting Molecules and Atoms in Chemical Equations

Question 1

Decomposition

Answer 1

A reaction that changes a compound into its constituent elements

Question 2

Formation Reaction

Answer 2

A reaction that starts with two or more elements and produces one compound

Question 3

(Complete) Combustions

Answer 3

A reaction in which O~2 is added to a compound containing carbon and hydrogen, producing CO~2 and H~2O

Question 4

What does an atom’s mass in ‘amu’ tell you?

Answer 4

An atom’s mass in amu tells you how many grams it takes to have one mole of those atoms.

Question 5

What does ‘amu’ stand for?

Answer 5

Atomic Mass Unit

Question 6

Mole

Answer 6

A specific number of atoms or molecules equal to 6.02 × 10^23.
Analogous to a dozen.

Question 7

What does a molecule’s mass in ‘amu’ tell you?

Answer 7

A molecule’s mass in amu tells you how many grams it takes to have one mole of those molecules.

Question 8

What does the coefficient to the left of a substance in a chemical equation represent?

Answer 8

The coefficient tells you how many moles of that substance are used in the equation.

Question 9

Avogadro’s number

Answer 9

The number 6.022 × 10^23 indicating the number of atoms or molecules in a mole of any substance

Question 10

Incomplete combustion

Answer 10

When a substance that contains hydrogen and oxygen burns in an environment with a limited amount of oxygen.
Carbon dioxide is not produced, instead plain carbon or carbon monoxide is produced.