Exam #2

Question 1

You would name CaSO4

Answer 1

Calcium Sulfate

Question 2

When elements in group 7A form ions, they are likely to

Answer 2

Gain 1 electron

Question 3

The molar mass of Fe is

Answer 3

55.85 g/mol

Question 4

The mass of one atom of magnesium is

Answer 4

24.31 amu

Question 5

What is the formula for tin (IV) carbonate

Answer 5

Sn (CO3)2

Question 6

What is the formula for the ammonium ion?

Answer 6

NH4

Question 7

What is the polyatomic ion name for PO4 (3-)

Answer 7

Phosphate ion

Question 8

What is the mass in grams of 0.54 mil BaSO4?

Answer 8

126 g

0.54 mol x molar mass BaSO4

Question 9

Which is not a diatomic molecule?

Answer 9

CO2

Question 10

Which is a diatomic molecule?

Answer 10

F2, Cl2, N2, H2

Question 11

Which of the following compounds is not an acid?

Answer 11

CH4

Question 12

Which compounds are acids?

Answer 12

Hl, HCl, HF

Question 13

Which molecule is incorrectly matched with its name?

Answer 13

NCl3; nitrogen chloride

Real name: nitrogen trichloride

Question 14

Name H2SO4

Answer 14

Sulfuric Acid

Question 15

Name SiH4

Answer 15

Silicon tetrahydride

Question 16

Name HNO3

Answer 16

Nitric Acid

Question 17

Name CO2

Answer 17

Carbon dioxide

Question 18

Suppose in a balanced equation the term 5 Ni3 (PO4)2 appears. How many atoms of nickel are represented?

Answer 18

15 atoms

Question 19

What will the charge on nickel metal with the formula Ni3 (PO4)2?

Answer 19

2+

Question 20

Naming compounds rule #1: Combination of 2 non metals

Answer 20

1. No prefix on the first word (element)

2. Second word uses “di-tri” prefixes

Question 21

Naming compounds Rule #2: Binary Ionic compounds (metal & non metal)

Answer 21

1. 1st word - name of metal

2. 2nd word - root of metal’s name + “ide”

Question 22

Naming compounds Rule #3: Nomenclature

Answer 22

Roman numerals give the cation’s charge for metals that can have one of several charges.