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Chemistry 11
Unit 4 Review Package
CHEMISTRY 11
UNIT 4 - CHEMICAL REACTIONS & STOICHIOMETRY - REVIEW PACKAGE
BALANCING EQUATIONS & CLASSIFYING REACTION
1. Balance and classify the following chemical reactions (PLO-D3)
a. ___KNO3 → ___KNO2 + ___O2
Reaction Type:
b. ___CaC2 + ___O2 → ___Ca + ___CO2
Reaction Type:
c. ___C5H12 + ___O2 → ___CO2 + ___H2O
Reaction Type:
d. ___K2SO4 + ___BaCl2 → ___KCl + ___BaSO4
Reaction Type:
e. ___KOH + ___H2SO4 → ___K2SO4 + ___H2O
Reaction Type:
f. ___Ca(OH)2 + ___NH4Cl → ___NH4OH + ___CaCl2
Reaction Type:
g. ___C4H9S + ___O2 → ___CO2 + ___SO2 + ___H2O
Reaction Type:
h. ___C15H30 + ___O2 → ___CO2 + ___H2O
Reaction Type:
i. ___BN + ___F2 → ___BF3 + ___N2
Reaction Type:
j. ___(NH4)2Cr2O7 + ___AlCl3 → ___Al2(Cr2O7)3 + ___NH4Cl
Reaction Type:
k. ___C17H36 + ___O2 → ___CO2 + ___H2O
Reaction Type:
l. ___Co + ___H2SO4 → ___Co2(SO4)3 + ___H2
Reaction Type:
m. ___P4 + ___Cl2 → ___PCl3
Reaction Type:
n. ___H3PO4 + ___Ba(OH)2 → ___Ba3(PO4)2 + ___H2O
Reaction Type:
Chemistry 11
Unit 4 Review Package
BALANCING EQUATIONS & CLASSIFYING REACTION & PREDICT PRODUCTS
2. Classify, complete AND balance the following chemical equations. Include abbreviations (s, l, aq, g).
(PLO-D3)
a. ___Ni(s) + ___Cu(NO3)2(aq) → ________________________
b. ___Fe(s) + ___O2(g) → ________________________
c. ___NaCl(s) → ________________________
d. ___ H2SO4(aq) + ___NaOH(aq) → ________________________
e. ___C4H10(l) + ___O2(g) → ________________________
f. ___Ag(s) + ___Cl2(g) → ________________________
g. ___Fe(s) + ___AgCl(aq) → ________________________
h. ___AgNO3(aq) + ___BaCl2(aq) → ________________________
i. ___BaCO3(aq) + ___Sr(OH)2(aq) → ________________________
j. ___C2H5OH(l) + ___O2(g) → ________________________
k. ___HNO3(aq) + ___KOH(aq) → ________________________
l. ___Al(s) + ___Zn(NO3)2(s) → ________________________
m. ___Na3PO4(aq) + ___Ca(NO3)2(s) → ______________________
n. ___Mg(H2PO4)2 → ________________________
o. ___Al + ___F2 → ________________________
Al+3
p. ___Sr(OH)2(aq) + HNO3(aq) → ________________________
Reaction Type:
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Reaction Type:
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Reaction Type:
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Reaction Type:
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Reaction Type:
Chemistry 11
Unit 4 Review Package
ENERGY OF REACTIONS:
3. Define the following terminology (PLO-D4)
a. Enthalpy:
b. Endothermic:
ΔH : Positive or Negative
c. Exothermic:
ΔH : Positive or Negative
4. Classify the following reactions as either endothermic or exothermic (PLO-D4)
a. 2C + O2 → 2CO2 + heat
b. N2O4 + heat → N2 + 2O2
c. AB + C → CB + A + 56.9kJ/mol
d. AB + CD → AD + BC
∆H = -256.4kJ/mol
e. 2HCl + 432 kJ/mol → H2 + Cl2
5. Draw the potential energy diagram for the reactions below (PLO-D4)
Energy (kJ/mol)
a. C12H22O11 + 12O2 → 12CO2 + 11H2O + 5638 kJ/mol
5676 kJ/mol
38 kJ/mol
Reaction proceeds
Chemistry 11
Unit 4 Review Package
Energy (kJ/mol)
b. C + D → CD
∆H = +65.7 kJ/mol
90.7 kJ/mol
25 kJ/mol
Reaction proceeds
6. Convert the following ∆H notation equations into thermochemical equations using the smallest coefficients
possible. (PLO-D4)
a. ½ B(s) + 3/2 H2O(g) → ¼ B2H6(g) + 3/4 O2(g)
b. ⅙ P4(s) + ½ Cl2(g) → ⅓ PCl3(s)
∆H = 762 kJ/mol
∆H = -613 kJ/mol
c. NH3(g) + 3/2 N2O(g) → 2N2(g) + 3/2 H2O(l)
∆H = -505 kJ/mol
7. Convert the following thermochemical equations into ∆H notation using the smallest whole number
coefficients possible. (PLO-D4)
a. ⅓ Cu(s) + ⅓ H2(g) + ⅓ O2(g)→ ⅓ Cu(OH)2(s) + 225 kJ/mol
b. 389 kJ/mol + ⅕ Sb4O6(s) + 3/5 C(s) → 2/5 Sb(s) + 3/5 CO(g)
c. F2(s) + ½ O2(g) → OF2(g) + 22 kJ/mol
Chemistry 11
Unit 4 Review Package
8.Use the given equation to answer the following questions (PLO-D4)
C12H22O11 + 12O2 → 12CO2 + 11H2O + 5638 kJ/mol
a. How much heat is released during the formation of 9.6 moles of CO2?
b. How much heat is released during the formation of 0.036 moles of H2O?
c. If 23.76 g of CO2 are produced, how much heat is released?
STOICHIOMETRY I:
9. Given the following balanced equations, solve the stoichiometric problems (PLO-D5)
a. Ammonia combines with oxygen gas in the following reaction:
4 NH3 + 5O2 → 6H2O + 4NO
i. How many moles of NH3 are needed to combine with 3.57 moles of O2 gas?
ii. If 1.5 grams of NO is produced in the above reaction, how many grams of NH3 were
reacted?
Chemistry 11
Unit 4 Review Package
b. For the double replacement reaction:
3Na2CO3 + 2FeCl3 → 6NaCl + Fe2(CO)3
i. How many grams of NaCl will be produced from the reaction of 0.080moles of Na2CO3 with
excess FeCl3?
ii. How many grams of FeCl3 would be needed to react with 4.2g of Na2CO3?
c. For the following reaction:
2 Si4H10 (s) + 13 O2 (g) à 8 SiO2 (s) + 10 H2O (g)
i. What volume of oxygen (STP) is required to react with 204.0 g of Si4H1?
ii. What mass of SiO2 is formed when 345.0 g of H20 are formed?
iii. How many molecules of H2O are formed when 17.92 L of O2 are used at STP?
iv. How many moles of Si4H10 are needed to just react with 1.204 x 1026 molecules of oxygen?
Chemistry 11
Unit 4 Review Package
d. For the following balanced equation:
3 HCl(aq)
+
Fe(OH)3 (aq) à
3 H2O(l) +
FeCl3 (aq)
i. It takes 19.56 mL of 0.50 M HCl to titrate a 25.0 mL sample of a solution of Fe(OH)3.
Calculate the [Fe(OH)3]?
ii. What mass of Fe(OH)3 is needed to completely react with 10.0 mL of 0.50M HCl solution?
iii. What volume of 0.50M HCl is required to titrate a 21.36 gram sample of iron (III)
hydroxide?
e. For the following balanced equation:
3Mg + 2AlCl3 → 3MgCl2 + 2Al
i. How many grams of MgCl2 would be formed if 50.0mL of 0.200M AlCl3 is reacted with
excess Mg?
ii. How many mL of 0.150M AlCl3 would be needed to react completely with 2.00g of Mg?
Chemistry 11
Unit 4 Review Package
STOICHIOMETRY II:
10. Given the following balanced equations, solve the stoichiometric problems (PLO-D5)
a. In a chemical reaction 6.92g of Fe2S3 is combined with 4.54g of oxygen gas.
2Fe2S3 + 9O2 → 2Fe2O3 + 6 SO2
i. Which reactant is the LIMITING reagent?
ii. How many grams of the EXCESS reactant will be left over after the reaction is complete?
iii. How many grams of Fe2O3 can be formed in this reaction?
b. Ca3(PO4)2 + 6 SiO2 + 10C → P4 + 6CaSiO3 + 10CO
What mass of P4 will be produced when 41.5g of Ca3(PO4)2, 26.3g of SiO2, and 7.80g of C are
reacted according to the following balanced equation?
Chemistry 11
Unit 4 Review Package
c. Given the balanced equation:
Al2C6
+ 6 H2O à 2 Al(OH)3 + 3CH4 (g)
i. If 34.5 grams of Al2C6 is mixed with 72.0 grams of water, which reactant is in
excess? Show by calculations.
ii. If 34.5 grams of Al2C6 is mixed with 72.0 grams of water, what mass of Al(OH)3 is
formed?
iii. If 34.5 grams of Al2C6 is mixed with 72.0 grams of water, what volume of CH4 is
formed at STP?
d. Given the equation:
4 NH3 + 5 O2 à 4 NO + 6 H2O
When 51.0 grams of NH3 is burned in an excess of oxygen, 52.65 g of water are
produced.
i. Calculate the theoretical yield of H2O.
ii. Calculate the % yield of H2O.
Chemistry 11
Unit 4 Review Package
e. Given the equation:
N2 + 3 H2 à 2 NH3
When 4.0 grams of hydrogen is combined with an excess of nitrogen, a 92% yield of NH3 is
obtained.
i. Calculate the theoretical yield of NH3
ii. Calculate the actual yield of NH3
f. For the following reaction:
4Al + 3O2 → 2Al2O3
i. How many grams of aluminum oxide, Al2O3, would be expected to form in the reaction of
15.0g Al with 18.43g of oxygen gas?
ii. If the actual yield of Al2O3 produced in the reaction was only 22.4g Al2O3, what would the
PERCENT YIELD of the reaction be?