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Chapter 3: Molecules, Compounds and Chemical Equations Name____________________________
Q1. Complete the following table
Formula Name Name Formula
CuO copper (II) oxide hydrocyanic acid HCN
NH 4 OH (^) barium carbonate
Pb(NO 3 ) 2 Potassium acetate
HNO 2 (aq) nitrous acid Lithium hydride LiH
Na 2 SO 3 potassium hydrogenphosphae
P 4 O (^10) Carbon monoxide
Mg(ClO 3 ) 2 Sodium nitride
Li 3 P (^) lithium phosphide Magnesium sulfide
N 2 O 4 Nickel (II) chloride
FeCO 3 Lead (II) chloride (^) PbCl 2
Ag 2 SO (^4) Aluminum sulfate
CCl (^4) carbon tetrachloride Sulfur tetrafluoride
SO 3 Silver sulfide
HClO 4 (aq) Potassium dichromate
NH 4 Br Lithium carbonate (^) Li 2 CO 3
Ca(OH) (^2) calcium hydroxide Carbon disulfide
NO 2 Nitrogen trichloride
CO 2 Phosphoric acid
HF(aq) Acetic acid (^) HC 2 H 3 O 2
Q2. Balance the following Chemical Equations:
(A) _____ CaC 2 (s) + _____H 2 O( l ) โ _____ Ca(OH) 2 (aq) + _____ C 2 H 2 (g)
(B) _____ P 4 O 10 + _____ H 2 Oโ ______ H 3 PO 4
(C) 2 C 3 H 8 O 3 + 7 O 2 โ 6 CO 2 + 8 H 2 O
or ___ C 3 H 8 O 3 + 7/2_ O 2 โ 3 CO 2 + 4 H 2 O
(D) _____ C 4 H 10 ( l ) + _____ O 2 (g) โ _____ CO 2 (g) + _____ H 2 O(g)
(E) ___ Al + ___ N 2 โ ___ Al 2 N 3
(F) 4_ NaN 3 โ 2 Na + 3 N 2
(G) ___ C 3 H 5 N 3 O 9 โ ___ CO 2 + ___ N 2 + ___ H 2 O + ___ O 2
Q3. Write balanced equations for the following chemical reactions
a. Solid mercury (II) nitrate on heating decomposes to form mercury (II) oxide, Oxygen gas and nitrogen dioxide gas.
2 Hg(NO 3 ) 2 (s) ๏ 2 HgO (s) + O 2 (g) + 4 NO 2 (g)
b. Dihydrogen monosulfide gas reacts with iron (III) hydroxide to form solid iron (III) sulfide and water.
c. Copper metal reacts with hot nitric acid to form copper (II) nitrate, nitrogen dioxide gas and water.
d. Solid calcium hydroxide reacts with hydrochloric acid to form aqueous calcium chloride and water.
Ca(OH) 2 (s) + 2 HCl (aq) ๏ CaCl 2 (aq) + 2 H 2 O (l)
e. Solid iron reacts with Oxygen gas to form solid Iron (II) oxide
f. Butane gas (C 5 H 12 ) reacts with Oxygen gas to form Carbon dioxide gas and water
Q4. Calculate the percent composition of each element in Al(NO 3 ) 3
Al: 12.67% N: 19.73% O: 67.60%
