Chemical Formulas and Chemical Compounds

What follows an element's symbol in a chemical formula to indicate the number of atoms of that element in one molecule of the compound?

• charge sign

• superscripted number

• number in parentheses

• subscripted number

The chemical formula for an ionic compound represents one

• formula unit

• ion

• molecule

• cation

What is the correct notation for a calcium ion whose outer shell is a full octet?

• Cal+

• Ca²+

• Cal-

• Ca²-

Tags

NGSS.HS-PS1-1

What is the correct name for the NO3 ion?

• nitrate

• nitrite

• nitride

• nitrogen oxide

What is the correct formula for copper(I) cyanide?

• CuCy

• CuCy₂

• CuCN

• Cu₂CN

Tags

NGSS.HS-PS1-2

What is the correct name for the acid CH3COOH?

• carbonic acid

• carbonate acid

• acetic acid

• acetous acid

What is the correct name for the compound P₂C14?

• phosphorus chloride

• phosphorus tetrachloride

• diphosphorus chloride

• diphosphorus tetrachloride

What is the correct formula for the compound made of magnesium and nitrogen?

• Mg₂N3

• Mg3N₂

• MgN₂

• MgN

Tags

NGSS.MS-PS1-1

Oxidation numbers are used to indicate the

• charge on an ion

• number of atoms or ions in a compound

• type of bond holding particles together in a compound

• distribution of electrons among the bonded particles in a compound

Tags

NGSS.HS-PS1-1

Atoms have an oxidation number of zero in a(n)

• pure element

• acid

• ionic compound

• molecular compound

Tags

NGSS.HS-PS1-1