Chemical Changes and Structure
Chemical Formulae and Balanced Equations NAT 5
Homework Two
1. Which of the following gases does not exist as diatomic molecules?
A
Nitrogen
B
Oxygen
C
Fluorine
D
Neon
2. Which of the following exists as diatomic molecules?
A
Carbon monoxide
B
Carbon tetrachloride
C
Nitrogen trihydride
D
Sulfur dioxide
3. The formula for calcium oxide is
A
Ca2O2
B
CaO2
C
Ca2O
D
CaO
4. The formula for magnesium hydroxide is
A
MgOH
B
Mg(OH)2
C
Mg2OH
D
Mg2(OH)2
5. The formula for potassium sulfate is
A
P2SO3
B
K2SO4
C
P2SO4
D
K2S
6. The formula for zinc(III)chloride is
A
Zn3Cl3
B
ZnCl3
C
Zn3Cl
D
ZnCl
7. What is the name of the compound with the formula Ag2O?
A
Silver(I) oxide
B
Silver (II) oxide
C
Silver(III) oxide
D
Silver(IV) oxide
8. What is the charge on the zinc ion in the compound zinc phosphate
Zn3(PO4)2?
A
2+
B
3+
C
2−
D
3−
9. What is the charge on the chromium ion in CrCl3?
A
1+
B
1-
C
3+
D
3-
10. Write the ionic formula for the following compounds
(a) Sodium oxide
(b) Magnesium carbonate
(c) Ammonium sulphate
(d) Lithium bromide
(e) Potassium dichromate
(f) Lithium hydroxide