Subject: STEM
Grade: 10
Ionic and covalent Compounds
Book reference: Stoichiometry
Name: ----------------------------------------------
Date:
/
/
Part A: Molecular Mass Calculation
1. Calculate the molecular mass of Acetic Acid, HC2H3O2.
2. Calculate the formula unit mass of Ammonium Chromate, (NH4)2CrO4.
3. Calculate the molecular mass of glucose, C6H12O6.
2019/2020
Page 1
Part B: Mole calculation
Calculate the mass in grams of 1.16 x 1022 molecules of nitrogen gas, N2
Calculate the number of entities in 0.641 g of oxygen gas, O2
Part C: Percent Composition
Calculate the percent composition of each element in the following compound:
Acetic Acid
HC2H3O2
Page 2
Part D: Empirical Formula Calculation
Given the following percent compositions, determine the empirical formula of the
following compound: 54.5% carbon, 9.15% hydrogen, and 36.3% oxygen
Page 3
Part F: Balancing Chemical Equations
Balance the following chemical equations (write the chemical formulas in #10
then balance):
1.
Fe
2.
Al
3.
+
FeCl3
----->
FeCl2
O2
----->
Al2O3
Na2CO3 +
C
+ N2
4.
FeS
O2
5.
IBr
6.
Cl2
7.
AgNO3
----->
8.
HClO4
+
9.
HCl
+
+
+
----->
NH3
+
NaCN
Fe2O3
+
----->
HOH
+
----->
----->
AgNO2
P4O10
+
HCl
+
----->
Mg(OH)2 ----->
CO
SO2
NI3
+
+
NH4Br
HClO
O2
H3PO4
MgCl2
+
Cl2O7
+
HOH
10. Sodium hydroxide + Hydrochloric acid -----> sodium chloride + water
Page 4
Part G: Single Replacement Reactions
Given the following Activity Series:
Li > K > Ba > Sr > Ca > Na > Mg > Al > Mn > Zn > Fe > Cd > Co > Ni > Sn > Pb > (H) > Cu > Ag > Hg > Au
Given the following Active Metals:
Li > K > Ba > Sr > Ca > Na
Complete the products of the following reactions, then balance the
equation (If no reaction write NR):
----->
1.
Cu(s)
+
Al(NO3)3 (aq)
2.
Al(s)
+
Cu(NO3)2 (aq) ----->
3.
Au(s) +
4.
Ca(s)
5.
Mn(s)
H2SO4 (aq)
+
+
H2O (l)
H2O (l)
----->
----->
----->
Page 5
Part H: Double Replacement Reactions
Given the following Solubility Rules for Ionic Compounds:
Compounds containing the following ions are generally soluble in water:
1. Alkali metal ions and ammonium ions, Li+, Na+, K+, NH4+
2. Acetate ion, C2H3O23. Nitrate ion, NO34. Halide ions (X), Cl-, Br-, I- (AgX, Hg2X2, and PbX2 are insoluble exceptions)
5. Sulfate ion, SO4 2- (SrSO4, BaSO4 , and PbSO4 are insoluble exceptions)
Compounds containing the following ions are generally insoluble in water:
6. Carbonate ion, CO32- (see rule 1 exceptions which are soluble)
7. Chromate ion CrO42- (see rule 1 exceptions which are soluble)
8. Phosphate ion PO43- (see rule 1 exceptions which are soluble)
9. Sulfide ion, S2- (CaS, SrS, BaS, and rule 1 exceptions are soluble in water)
10. Hydroxide ion, OH- [Ca(OH)2 , Sr(OH)2 , Ba(OH)2 , and rule 1 exceptions are soluble)
Complete and balance the following reactions using the above solubility table (write no reaction or NR if both
products are soluble or a covalent compounds is not formed)
1. ___ AlCl3 (aq) + ___ K2CO3 (aq) ----->
2. ___ NiSO4 (aq) + ___ Li3PO4 (aq) ----->
3. ___ NaCl (aq) + ___ AgNO3 (aq) ----->
4. ___ H2SO4 (aq) + ___ NaOH (aq)
----->
5. ___ H3PO4 (aq) + ___ Ba(OH)2 (aq) ----->
Page 6
Part I: Mole-Mole Stoichiometry
Tungsten occurs in the important mineral scheelite (Calcium tungstate), which is
converted to tungstic acid. Tungsten is then extracted from tungstic acid by the
following (unbalanced) reaction:
H2 +
H2WO4

W
+
H2O
How moles of hydrogen is needed to prepare 6 moles of elemental tungsten?
Phosphoric acid can be made by the following (unbalanced) reaction:
H2O
+
P4O10

H3PO4
How many moles of Phosphoric acid can be prepared from the combination of 5
moles of Tetra-phosphorus dec-oxide with excess water?
Page 7
Part N: Multiple Choice Chapters 8,9,10
____1. Which of the following is equal to one mole of substance?
(A) 6.02 x 1023 sodium atoms, Na
(B) 6.02 x 1023 chlorine molecules, Cl2
(C) 6.02 x 1023 sodium chloride formula units, NaCl
(D) 6.02 x 1023 chloride ions, Cl 1(E) A & B are both correct
(F) C & D are both correct
(G) all of the above are correct
____2. Which of the following represents 1 mole of ozone gas, O3?
(A) 6.02 x 1023 ozone molecules
(B) 48.0 g ozone gas
(C) 22.4 L ozone gas at STP
(D) all of the above
(E) none of the above
_____3. What is the molecular mass of mercurous nitrate, Hg2(NO3)2 ?
(A) 463.2 g/mol
(B) 477.2 g/mol
(C) 511.2 g/mol
(D) 525.2 g/mol
(E) 649.2 g/mol
(F) none of the above
_____4. If 0.125 mol of S combines with 0.250 mol of O, what is the empirical formula of
sulfur oxide?
(A) SO
(B) SO2
(C) SO4
(D) S2O
(D) S4O
_____ 5. The insulating material Styrofoam is a polymer of styrene. Find the molecular
formula of styrene given its percentage composition:
92.25% Carbon, 7.75% hydrogen.
The approximate molar mass is 104 g/mol.
(A) C1H1
(B) C1H8
(C) C1H12
(D) C8H8
(E) C12H1
Page 8
_____6. What is the term that expresses the simplest whole number ratio of atoms in a
molecule, or ions in a formula unit?
(A) chemical formula
(B) simplest formula
(C) molecular formula
(D) empirical formula
(E) mass ratio composition
(F) percentage composition
_____7. Which of the following is evidence for a chemical reaction?
(A) a gas is detected
(B) a precipitate is formed
(C) a colour change is observed
(D) an energy change is noted
(E) both B & C are correct
(F) all are correct
(G) none of the above
_____8. What is the term for a compound that releases hydrogen ions when dissolved in
water?
(A) acid
(B) aqueous acid
(C) base
(D) aqueous base
(E) none of the above
______9. The product(s) of a neutralization reaction is (are)
(A) water
(B) aqueous acid
(C) aqueous base
(D) salt
(E) aqueous acid and aqueous base
(F) aqueous acid and water
(G) salt and water
(H) aqueous base and water
(I) aqueous acid, water, aqueous base
(J) none of the above
______10. Ethane, C2H6, burns to give carbon dioxide and water. What is the
coefficient of oxygen gas need to balance the reaction:
(A) 5
(B) 7
(C) 10
(D) 14
(E) none of the above
Page 9
Use the following choice in questions 11-15 to classify each of the following chemical
equations (unbalanced):
A.
B.
C.
D.
E.
F.
Combination (or synthesis)
Decomposition (or analysis)
Single replacement
Double Replacement
Neutralization
Combustion
_____11.
C5H12
+
_____12.
K
+
_____13.
Al(OH)3
+
_____14.
Zn
HCl
_____15.
+
S
CO2

HNO3

KClO3

O2
H2O
K2S


KCl
+
Al(NO3)3
ZnCl2
+
+
+
H2O
H2
O2
Answwers:
1.g
2. d
11. f 12. a
3. d
13. e
4. b
14.c
5. d 6.d 7.f
8.b
9.g
10.b
15.b
Page 10