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Chemistry 11 Review Unit 4 Chemical Change

Review Unit 4 Chemical Change of 9

Name ___________________________

Unit 4 Review – Chemical Change 1. Balance the following equations:

a. NO + H2O NH3 + O2

b. (NH4)2Cr2O7 + AlCl3 Al2(Cr2O7)3 + NH4Cl

c. C17H36 + O2 CO2 + H2O

d. Co + H2SO4 Co2(SO4)3 + H2

e. P4 + Cl2 PCl3

f. H3PO4 + Ba(OH)2 Ba3(PO4)2 + H2O

g. Al(CH3COO)3 Al + C + H2 + O2

2. Complete, balance and classify the following equations as synthesis,

decomposition, single replacement, double replacement, neutralization or combustion.

a. Al + Zn(NO3)2 Reaction Type _______________________________

b. C6H14 + O2 Reaction Type _______________________________

c. Na3PO4 + Ca(NO3)2 Reaction Type _______________________________

d. Mg(H2PO4)2 Reaction Type _______________________________

e. Cl2 + KI Reaction Type _______________________________

f. Al + F2 Reaction Type _______________________________



g. Zn + Cu(ClO3)2 Reaction Type _______________________________ h. Co(NO3)3 + (NH4)2C2O4

Reaction Type _______________________________ i. C12H25OH + O2

Reaction Type _______________________________

j. Sr(OH)2 + HNO3 Reaction Type _______________________________

k. V + O2 (Assume combining capacity of V is 5+) Reaction Type _______________________________

l. Rb3AsO4 Reaction Type _______________________________

m. CsOH + H3PO4 Reaction Type _______________________________

n. Ni(NO3)2 + (NH4)3PO4 Reaction Type _______________________________

o. Al + H2CO3 Reaction Type _______________________________

p. MgSO4 + AgNO3 Reaction Type _______________________________



3. State whether each of the following are exothermic or endothermic.

a. HCl + 432 kJ H + Cl Answer ___________________________

b. C12H22O11 + 12 O2 12CO2 + 11H2O + 5638 kJ Answer ___________

c. H2O(l) H2O(g) Answer ___________________________

d.

Answer ___________________________

e. C + D CD ∆H= +65.7 kJ Answer ___________________________

f. E + F G + ∆H= - 437 kJ Answer ___________________________

4. In an exothermic reaction, the surroundings get (warmer/cooler) _________________________.

5. Define enthalpy

6. Why does a light stick glow brighter when it is heated? 7. Which reaction will be faster? 6M HCl with zinc or 3 M HCl with zinc WHY?

Ener

gy (k

J)

Reaction Proceeding

A + B

AB



8. Use the following Potential Energy Diagram to answer the questions below:

a) Determine the Activation Energy for the forward reaction..._______________kJ b) Determine the Activation Energy for the reverse reaction...._______________kJ c) What is the Enthalpy Change ( H ) for the forward reaction?.._______________kJ d) What is the Enthalpy Change ( H ) for the reverse reaction?.._______________kJ e) The forward reaction is _____________thermic. f) The reverse reaction is ______________thermic. g) Which species or set of species forms the Activated Complex?______________ h) What is the formula for the activated complex? ___________________ 9. State the meaning of Activation Energy

0

20

40

60

80

100

Progress of Reaction

AB + C

ABC

A + BC

0



1.21.00.80.60.40.20.00

50

100

150

200

250

300

Progress of Reaction

Potential Energy

0

AB + C

ABC

A + BC

10. Use the following Potential Energy Diagram to answer the questions below: a) Determine the Activation Energy for the forward reaction...

_________________kJ b) Determine the Activation Energy for the reverse reaction....

_________________kJ c) What is the Enthalpy Change ( H ) for the forward reaction?..

_________________kJ d) What is the Enthalpy Change ( H ) for the reverse reaction?..

_________________kJ e) The forward reaction is _____________thermic. f) The reverse reaction is ______________thermic. g) Which species or set of species forms the Activated Complex?

________________ 11. Given the balanced equation:

2 Si4H10 (l) + 13 O2 (g) 8 SiO2 (aq) + 10 H2O (g)

a) What volume of oxygen (STP) is required to react with 204.0 g of Si4H10?



b) What mass of SiO2 is formed when 345.0 g of H20 are formed?

c) How many molecules of H2O are formed when 17.92 L of O2 are used at STP?

d) What is the concentration of 25.0 mL SiO2 if 250.0 mL of 1.78M Si4H10 is reacted?

12. Given the balanced equation:

Al2C6 + 6 H2O 2 Al(OH)3 + 3CH4 (g)

a) If 34.5 grams of Al2C6 is mixed with 72.0 grams of water, which reactant is in excess? Show by calculations.

b) If 34.5 grams of Al2C6 is mixed with 72.0 grams of water, what mass of Al(OH)3 is formed?



c) If 34.5 grams of Al2C6 is mixed with 72.0 grams of water, what volume of CH4 is formed at STP? 13. Given the equation: 4 NH3 + 5 O2 4 NO + 6 H2O

When 51.0 grams of NH3 is burned in an excess of oxygen, 52.65 g of water are produced.

a) Calculate the theoretical yield of H2O.

b) Calculate the % yield of H2O.

14. Given the equation: N2 + 3 H2 2 NH3

When 4.0 grams of hydrogen is combined with an excess of nitrogen, a 92% yield of NH3 is obtained. a) Calculate the theoretical yield of NH3

b) Calculate the actual yield of NH3



15. Given the balanced equation:

3 HCl(aq) + Fe(OH)3 (aq) 3 H2O(l) + FeCl3 (aq)

a) 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 ]

b) What mass of Fe(OH)3 is needed to completely react with 10.0 mL of 0.50M HCl solution?

c) What volume of 0.50M HCl is required to titrate a 21.36 gram sample of iron (III) hydroxide?



16. Given the following balanced equation, answer the questions below it.

2C6H14(l) + 19O2(g) 12CO2(g) + 14H2O(l)

a. If 299.05 g of C6H14 is mixed with 920.0 grams of oxygen gas, which reactant is limiting? (2 marks) Answer _______________________

b. How much is the other reactant in excess?

Answer _______________________

unit 4 review – chemical changekprimatesta.weebly.com/.../3/1/0/23103960/unit4reviewkey.pdf ·...

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