Chapter 4: Ionic Compounds

Question 1

What’re polyatomics?

Answer 1

A charged ion composed of 2+ atoms covalently bonded.

Question 2

Ionic compounds are made up of ___.

Answer 2

A metal and a non-metal

Question 3

If a substance has more than one charge, _____

Answer 3

aa ROMAN NUMERAL is used to indicated the oxidation number of the cation.

Question 4

To indicate the number of atoms of each element present in a compound, chemists use _____

Answer 4

Subscripts

Question 5

Carbonate

Answer 5

(CO3)2-

Question 6

Sulfate

Answer 6

(SO4)2-

Question 7

Nitrate

Answer 7

(NO3)1-

Question 8

Phosphate

Answer 8

(PO4)3-

Question 9

Hydroxide

Answer 9

(OH)1-

Question 10

Ammonium

Answer 10

(NH4)1+

Question 11

Ionic compounds characteristics (6)

Answer 11

1. Atoms GAIN/LOSE ELECTRONS to form a compound
2. Rigid crystal lattice
3. Have high melting/ boiling points
4. Conduct electricity when dissolved in water
5. Highly soluble in water
6. Solid at room temp.

Question 12

Covalent compounds characteristics

Answer 12

1. Atoms SHARE ELECTRONS to form a compound.
2. Low melting/boiling points
3. Don’t conduct electricity when dissolved in water
4. Solubility varies in water
5. Solid, liquid, or gas at room temp.

Question 13

Writing the NAME of an ionic compound

Answer 13

1. Write cation first, straight name no change

2. Write anion with -ide

Question 14

Writing the FORMULA of an ionic compound

Answer 14

1. Write elements w/ oxidation states
2. Criss-cross superscripts (NO CHARGE) -> subscripts
3. Check if reducible with common factor

Question 15

Do compounds have a charge?

Answer 15

No, they’re neutral after being criss-crossed.

Question 16

Ionic charge for periodic table groups

Answer 16

+1, +2, TRANSITION METALS, +3,+4, -3, -2, -1, -