Unit 4 Compounds Review

Metals become positive as they give away electrons to create compounds with nonmetals, so they are called

• cations

• anions

• iosotopes

• acids

Nonmetals receive electrons when they form compounds with metals, giving them an overall negative charge, therefore, they are called

• cations

• anions

• isotopes

• acids

How many hydrogen atoms are in this compound; HC₂H₃O₂

• 8

• 3

• 5

• 4

Answer explanation

add all of the hydrogen atoms together (subscripts follow the atoms they go with) and if you do not see a subscript behind an atom then it is understood to be 1).

Tags

NGSS.MS-PS1-1

What type of compound is K₃P?

• ionic

• covalent

Answer explanation

K (potassion) is a metal, so this is an ionic compound formed with a metal and nonmetal or 2 ions.

What type of compound is Cl₂?

• ionic

• covalent

Answer explanation

This is a compound between 2 chlorine atoms, and chlorine is a nonmetal, so this is a covalent bond.

What type of compound is NH₄Cl?

• ionic

• covalent

Answer explanation

NH4 is ammonia, a polyatomic ION which forms ionic bonds with other elements to form an ionic compound.

Tags

NGSS.HS-PS1-3

What type of compound is Copper (II) Oxide?

• ionic

• covalent

Answer explanation

Copper is a metal (a transition metal) and Metals form ions when bonding with nonmetals (like oxygen) so this is an ionic compound.

What is the name of this compound: Na₂O

• disodium monoxide

• sodium (I) oxide

• sodium oxide

• sulfuric acid

Answer explanation

Sodium and oxygen form an ionic bond. The names for ionic compounds include the name of the metal and the name of the nonmetal with the ending changed to -ide. NO PREFIXES for ionic compounds.

Tags

NGSS.MS-PS1-1

What is the name of this compound: CF₄

• carbon fluoride

• carbon tetrafluoride

• monocarbon tetrafluoride

• carbofluoric acid

Answer explanation

This is an ionic compound, so the name will include the greek prefixes used to indicate the number of each type of element. The exception to that is that the first element will not have mono- in front of it if there is only one of those, just leave the name as is instead.

What is the name of this compound: Cu₂S₃

• copper (III) sulfide

• dicopper trisulfide

• copper sulfide

• copper (II) sulfide

Answer explanation

First realize this is an ionic compound because copper is a metal and sulfur is a nonmetal. Next, notice that copper is a transition metal so it will have a Roman numeral listed behind it in the compound name to indicate its charge. Looking at the subscripts, you can see that oxygen (which has a 2- charge) will have 3 atoms in this compound, so there are 6 total negative charges (3 x 2 =6). There must also be 6 total positive charges and since the subscript is a 2 for Copper, its charge must be a 3+ (2 x 3 =6). So we use the (III) behind copper in the name to indicate its charge.

Tags

NGSS.MS-PS1-1