Unit 1-2 Chemistry Final exam

He

N2

NH3

O2

There are three molecules; each molecule is made of 2 nitrogen atoms and 1 hydrogen atom.

There are two molecules; each molecule is made of 3 nitrogen atoms and 3 hydrogen atoms.

There are two molecules; each molecule is made of 1 nitrogen atom and 3 hydrogen atoms.

There are 2 molecules; each molecule is made of 3 NH atoms

The water is in the gaseous state because the molecules are close together and have strong attractive forces between them.

The water is in the solid state because the molecules are close together and have strong attractive forces between them.

The water is in the solid state because the molecules are far apart and have weak attractive forces between them.

The water is in the gaseous state because the molecules are far apart and have weak attractive forces between them.

Each fluorine atom contains 9 protons, 9 neutrons, and 9 electrons.

Each fluorine atom contains 9 protons, 19 neutrons, and 9 electrons.

Each fluorine atom contains 9 protons, 10 neutrons, and 10 electrons.

Each fluorine atom contains 9 protons, 10 neutrons, and 9 electrons.

They are found in the nucleus of an atom

They are repelled by other electrons.

They are attracted to the protons of the nucleus.

They are found in the orbitals of electron shells.

Helium

Carbon

Oxygen

Barium

All three elements have the same number of valence electrons.

All three elements have the same reactivity.

All three elements have a different number of valence electrons.

All three elements have a different number of energy shells.

Cesium

Argon

Carbon

Iodine

Carbon

Krypton

Magnesium

Germanium

Lithium has more protons, so it attracts its valence electrons closer to the nucleus.

Lithium has more energy levels, so its valence electrons are further away from the nucleus.

Hydrogen has fewer protons, so it attracts its valence electrons closer to the nucleus.

Hydrogen has fewer energy levels, so its valence electrons are further away from the nucleus.

Nitrogen, Fluorine, Neon, Silicon

Silicon, Neon, Fluorine, Nitrogen

Silicon, Nitrogen, Fluorine, Neon

Neon, Fluorine, Nitrogen, Silicon

NH3

CO2

CH4

CaBr2

1, 4, 1, 1

1, 2, 5, 1

1, 4, 5, 1

2, 2, 5, 2