Name:__________________________ Toronto High School SCH4U - Test#2 Knowledge/ Thinking/Inquiry Communication Understanding 15 7 12 Fall /2016 Ms. S. Nikoudad
Application Total 10 44 Knowledge: [……………/15] 1-An increase in temperature:
a) Lowers the activation energy b) Increases the number of collisions c) Increases the population of molecules that can overcome the activation barrier
d) b and c e) a and c 2- Consider the following experimental results, which of the following factors would account for the lower
rate in Experiment 1? A. Temperature B. nature of reactants C. surface area of Cu D. concentration of acid 3- Which of the following actions would not change the rate of a reaction?
a) increasing the concentration of the reactants b) increasing the available surface area of a reactant c) using different reactants d) removing heat from the reaction e) none of the above
4- Consider the following potential energy diagram: The energy interval that represents the activation energy for this reaction is:
A. I B. II C. III D. IV 5- Which of the following equations shows the correct thermochemical equation for the heat of formation of
CO (g) ? 6- Which of the following are necessary for successful collisions to occur?
I :Favorable geometry
A. I only II :Sufficient energy
B. I and II only III :Large ∆H
C. II and III only D.I, II, and III 7- For each of the following situations, determine the effect on the rate of reaction (Circle the correct choice)
and state which of the 5 factors affecting rate of reaction are being changed. [4]
A block of wood is cut into smaller pieces before being burned in a fire. (1.5) (2.5) 8. Use the thermo chemical equations shown below to determine the enthalpy for the reaction: (5)
HCl(g) + NaNO2(s) → HNO2(l) + NaCl(s)
2NaCl(s) + H2O(l) → 2HCl(g) + Na2O(s) ΔH = 507 kJ NO(g) + NO2(g) + Na2O(s) → 2NaNO2(s) ΔH = -427 kJ NO(g) + NO2(g) → N2O(g) + O2(g) ΔH = -43 kJ 2HNO2(l) → N2O(g) + O2(g) + H 2O(l) ΔH = 34 kJ given the following reactions: Thinking/Inquiry: [……………../7] 1-The complete combustion of 1.00 mol of sucrose, C12H22O11, releases 5641 kJ of energy. How many
grams of sucrose is needed to change the temperature of 750 g water from 11 to 33 C?
C12H22O11(s) + 24O2(g) → CO2(g) + 11H2O(l) (………./4) 2-The complete combustion of 1.00 mol of an unknown compound, XYZ, releases −5641 kJ of energy
XYZ(s) + 12O2(g) → 12CO2(g) + 11H2O(l) (………./3) Use the enthalpy change of this reaction, and enthalpies of formation from the table, to determine the enthalpy
of formation of the unknown compound. Communication: [……………/12] 1- For the following pair of substances state which would have a higher rate of reaction and explain
why (refer to the 5 factors that affect rate, and explain why that factor affects the rate of reaction) (……/3)
3g of salt dissolved in a solution of 1M (1 mole/L) hydrochloric acid versus 3g of salt dissolved in a solution
of 0.1M (0.1 moles/L) hydrochloric acid. 2- What is a catalyst? What is the effect of adding a catalyst on the rate of reaction? Explain what happens in
the reaction to cause this effect. (………../2) 3- State two reasons why some collisions may not result in a chemical reaction. (.……...../2)
Reason I:
Reason II: 4- What is the meaning of “enthalpy of formation”? (……../2) 5-Calculate the enthalpy change from bond energies for the following reaction: (3)
? + + Application: […………../10] 1-An endothermic reaction is given as below: (…………/2)
XZ + YBD XBD + YZ
a) Draw the structure of the activated complex for this reaction. (1)
b) Within the activated complex, show/name the bonds which are stronger than other bonds in the compound. (1) 2-Calculate the value of ∆Ho for the following reactions using the table of standard enthalpy of formation.
Assume all reactants and products are in the gaseous state. (Show all your work) (…………/2)
CH3CH2CH3 + 5 O2 → 3 CO2 + 4 H2O 3-Use the following data to : (…………/6)
a) calculate the rate law equation ,including all exponents, rate constant and its unit for the system.
(4 marks) b) Calculate reaction rate when [NO]=[H2]=0.20 mol/L. (1 mark) c) What is the over all order? (1 mark) Good Luck

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