sch4u chemistry final examination - sunway · pdf filematriculation programme sch4u chemistry...

PARTS Category Answer Mark Distribution A Knowledge and Understanding On Page 2 20%, allow 35 minutes B Communication

In Exam

20%, allow 20 minutes C Thinking and Investigation 40%, allow 40 minutes D Application 20%, allow 25 minutes

100%, 120 minutes

Canadian International Matriculation Programme

SCH4U CHEMISTRY FINAL EXAMINATION

Date: Tuesday, June 9, 2015

Time: 11:30 AM – 1:30 PM

Length: 2 Hours

Teachers: Ms. Kimberley Gagnon & Ms. Véronique Turpin

Student Name: Period:

INSTRUCTIONS 1. Circle your teacher’s name above.

2. Check that your examination has 18 typed pages, including the cover page.

3. Answer Part A on the Answer Sheet provided on Page 2 and Parts B, C & D on this exam.

4. You may use a scientific calculator.

5. Chemistry Periodic Table, Standard Reduction Table and Equations are provided separately

on Pages 17 and 18. Tear this last sheet off the exam for easy referral.

6. There are four parts to the exam. Read instructions to each part carefully.

STRUCTURE/EVALUATION

TOTAL

For awesome teacher use only

Part A Performance Level

Part B Performance Level

Part C Performance Level

Part D Performance Level

Overall Performance Level

Percentage

= 4 3 2 1 R 25

4 3 2 1 R

4 3 2 1 R

4 3 2 1 R

4 3 2 1 R

%

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14. a b c d e

15. a b c d e

16. a b c d e

17. a b c d e

18. a b c d e

19. a b c d e

20. a b c d e

21. a b c d e

22. a b c d e

23. a b c d e

24. a b c d e

25. a b c d e

Part A: Circle the Answers to Multiple Choice Questions Here

1. a b c d e

2. a b c d e

3. a b c d e

4. a b c d e

5. a b c d e

6. a b c d e

7. a b c d e

8. a b c d e

9. a b c d e

10. a b c d e

11. a b c d e

12. a b c d e

13. a b c d e

PART A: Knowledge & Understanding (allow 35 minutes)

Instructions:

Identify the letter of the choice that best completes the statement or answers the questions. Circle the answer on the Answer Sheet on Page 2.

−

Part B: Communication: (allow 20 minutes)

Instructions: Answer four (4) of the following 5 questions ONLY. If you attempt all four CIRCLE the questions you want marked otherwise the first four will be marked. Show your thinking and use a combination of words, symbols, diagrams and pictures to express your ideas.

1. Alcohols are generally produced from the fermentation of fruit with yeast or the hydration of an

alkene. Alcohols are widely used as solvents in drugs and perfumes. Some alcoholic compounds are:

Compound Number

Alcohol Name Molecular Formula

1 Propanol CH3CH2CH2OH 2 Methanol CH3OH 3 Butanol CH3CH2CH2CH2OH 4 Ethanol CH3CH2OH

The compounds in order of increasing solubility in water is _, , , and _. Explain how you know.

2. Draw the Lewis Diagram of ��3 �𝑟 �𝐶�3. Make sure to indicate the lone pair of

electrons, specify shape, and whether the molecule is polar.

3. The following reaction is an example of homogeneous equilibrium

H2(g) + I2(g) 2HI(g)

Explain what happens to the system when a small amount of HI(g) is added to the system?

4. Explain why the following redox reaction does not happen spontaneously.

Au(s) + Mg2+(aq) → Au3+(aq) + Mg(s)

5. Create a simple potential energy diagrams for the following reaction:

S(s) + O2 (g) → SO2 (g) ∆H°r = -296.6 kJ Ea = 100 kJ

Part C: Thinking/Investigation: (allow 40 minutes)

Instructions: Answer six (6) of the following 7 questions ONLY. If you attempt all six CIRCLE the questions you want marked otherwise the first six will be marked. Write the answer in the space provided. If the question requires mathematical calculations, show all of your work. Answer all questions with the correct units and number of significant figures.

1. Calculate the heat of reaction for the following equation given equations (1), (2), and (3).

4NH3(g) O2(g) 4NO2(g) 6H2O(g)

(1) N2(g) H2(g) NH3(g)

Hf 46.15 kJ

(2) N2(g) O2(g) NO2(g) Hf 33.81 kJ

(3) H2(g) O2(g) H2O(g) Hf 241.6 kJ

2. Complete the following table, based on the following equilibrium system.

2Cl2(g) 2H2O(g) 4HCl(g) O2(g) H 133 kJ

Stress Equilibrium shift

increase in temperature

increase in hydrogen chloride

increase in pressure

removal of oxygen gas

addition of a catalyst

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3. 0.566 mol of NO2(g) is placed in a 1.00 L container. After the following equilibrium is established, the

container is found to contain 0.500 mol of NO. What is the equilibrium constant for this reaction?

2NO2(g) 2NO(g) O2(g)

4. a. Write the ground state electronic configuration for bromine, Br.

b. Draw the energy level diagram for bromine.

c. State the four quantum numbers for the bromines outermost electron.

(_ , _, _,_ )

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5. Draw and label the electrochemical cell (galvanic cell) given the

following:

In your diagram, label:

◦ anode & cathode

Al(s) │ Al3 ║Cu2 │ Cu

(aq) (aq) (s) ◦ choice of electrolytes

◦ direction of electron flow

◦ cations & anions

◦ oxidation and reduction half-cells

Also calculate:

◦ overall cell potential calculation

◦ overall redox reaction for the cell.

6. Complete the following table:

IUPAC Name Structure Name of Compound

3-methylbutan-2-ol

alcohol

N-ethyl-N-isopropylpentanamine

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7. Draw the products produced in the following diagram and then state what type of reaction it is (i.e.

addition).

Part D: Application: (allow 25 minutes)

Instructions: Answer four (4) of the following 5 questions ONLY. If you attempt all five CIRCLE the questions you want marked otherwise the first four will be marked. If the question requires mathematical calculations, show all of your work. Answer all questions with the correct number of significant figures (digits).

1. Vinegar is 5.0% acetic acid (ethanoic acid). If Ka for acetic acid (ethanoic acid) is 1.8 x 10-5, what is the pH of vinegar?

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Tests Conducted Observations Organic Compound

Beaker A -added bromine in water

- yellow solution changed to a colourless solution

Beaker B -added KMnO4

- purple solution changed to a brown precipitate

Beaker C -the mixture was separated and then distilled

- smelled very fruity

Beaker D - lit the compound on fire

- lots of black soot was produced

Beaker E -added K2Cr2O7/acidified

- showed no changes in colour

2. Quicklime, CaO, is widely used in the building and steel industries. In the past, lime was

difficult to transport because of its exothermic reaction with water. Several ships caught on fire when water leaked in and reacted with the lime.

CaO(s) H2O(l) Ca(OH)2(aq) H –65.2 kJ/mol

If 10.0 g of quicklime is added to a 500 mL sample of water, what would the final temperature of the solution be?

Assumptions

◦ all the quicklime dissolved in the water so there is no change in volume of water ◦ no heat was lost to the surroundings ◦ the initial temperature of both the water and the quicklime was 25.0°C

◦ cH2O= 4.19 J/g°C

3. Uh oh! In the lab, Adnan and Wilson have 5 unlabeled beakers on their desk. Each contain different

organic chemicals. What will they do to escape Ms. Turpin and Ms. Kim’s wrath?

Ah ha! They decide to carry out some organic chemistry reactions to determine what is in them. The following tests were conducted and Adnan and Wilson recorded their observations. Help them determine which compound is in each beaker.

Hint! Possible Answers:

◦ butanol

◦ cyclohexene

◦ butylethanoate

◦ methylbenzene

◦ 2-methylpentane-2-ol

?

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4. A galvanic cell was constructed by connecting a nickel electrode into 1.20 M nickel (II) sulphate

solution to a chromium electrode that was dipping into a solution containing Cr3+ ions at an

unknown concentration. The potential of the cell was measured to be 0.552 V, with the chromium

serving as the anode. What was the concentration of Cr3+ ions in the solution of unknown

concentration?

5. Chemistry is all around us and is the very foundation of life as we know it. In the space below, state ONE chemistry related topic from our SCH 4U course and explain the science behind it. Next, briefly mention its implications in technology (or industry) and its impact on society and the environment.

State your topic :

Explain the science :

Technology :

Society :

Environment :

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BLANK PAGE

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�

Data and Formulae

Thermochemistry

� = ��∆�

∆� = −�

∆� = �∆�𝑟

∆� = ∆� − �∆�

° °

∆� = �∆��(��) − �∆��(��)

Electrochemistry 0.0592

Ecell = Ecell - 𝑛

G = -nFEcell

logQ

1F = 96500 C = 1mole 𝑒 −

Q = It

𝐼𝑡 � =

𝐹

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