Chapter 18 Chemistry and Physics

What is the total number of atoms in the compound Ca(NO₃)₂?

• 2
• 9
• 3
• 5

Tags

NGSS.MS-PS1-1

What is the charge of oxygen in Na₂O?

• 4+
• 2+
• 2-
• 1-

If the elements in a compound are not equally sharing the electrons, the molecule will be ________.

• nonpolar
• polar
• ionic
• hydrate

What is the total number of atoms in the compound H₂O₂?

• 4
• 2
• 1
• 8

Tags

NGSS.MS-PS1-1

Why do noble gases NOT form compounds readily?

• They have empty outer energy levels.
• They have 7 electrons in the outer energy levels.
• They have no electrons.
• The outer energy level is completely filled with electrons.

Tags

NGSS.HS-PS1-1

The sum of the oxidation numbers in a neutral compound is always ___.

• one
• zero
• a negative number
• a positive number

The ___ tells you how many electrons an atom must gain, lose, or share to become stable.

• atomic mass
• atomic number
• oxidation number
• ionic number

How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?

• 4
• 8
• 18
• 6

Tags

NGSS.HS-PS1-1

A chemical bond that occurs when atoms share electrons is a(n) _______ bond.

• ionic
• covalent
• polyatomic
• magnetic

How many nitrogen atoms are present in one molecule of ammonium acetate, NH₄C₂H₃O₂?

• 12
• 1
• 7
• 4