Question

1. identify the following examples as elemental molecules, compound molecules, or mix

oxygen
carbon dioxide
nitric acid
hydrochioric acid
air
nitrogen

1. complete the following definitions.

a. an atom or element is a ________ substance that is made up of ________ atom.
b. an elemental molecule is made up of ____________________________ atoms that are __________________.
c. a compound molecule is made up of ____________________________ atoms that are __________________.

Explanation:

Step1: Recall definitions

An elemental molecule consists of atoms of the same element, a compound molecule has atoms of different elements, and a mixture contains different substances.

Step2: Analyze oxygen

Oxygen ($O_2$) has only oxygen atoms, so it is an elemental molecule.

Step3: Analyze carbon - dioxide

Carbon - dioxide ($CO_2$) has carbon and oxygen atoms, so it is a compound molecule.

Step4: Analyze nitric acid

Nitric acid ($HNO_3$) has hydrogen, nitrogen, and oxygen atoms, so it is a compound molecule.

Step5: Analyze hydrochloric acid

Hydrochloric acid ($HCl$) has hydrogen and chlorine atoms, so it is a compound molecule.

Step6: Analyze air

Air contains nitrogen, oxygen, carbon - dioxide etc., so it is a mixture.

Step7: Analyze nitrogen

Nitrogen ($N_2$) has only nitrogen atoms, so it is an elemental molecule.

for definitions:

Step1: Define atom/element

An atom or element is a pure substance that is made up of one type of atom.

Step2: Define elemental molecule

An elemental molecule is made up of two or more atoms that are of the same element.

Step3: Define compound molecule

A compound molecule is made up of two or more atoms that are of different elements.

Answer:

Oxygen: Elemental Molecule
Carbon dioxide: Compound Molecule
Nitric acid: Compound Molecule
Hydrochloric acid: Compound Molecule
Air: Mixture
Nitrogen: Elemental Molecule