SENIOR CERTIFIC ATE/ NATIONAL SENIOR CERTIFICATE GRADE 12 - Western Cape

SENIOR CERTIFICATE/ NATIONAL SENIOR CERTIFICATE

GRADE 12

PHYSICAL SCIENCES: CHEMISTRY (P2) NOVEMBER 2020

MARKS: 150 TIME: 3 hours

This question paper consists of 15 pages and 4 data sheets.

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Physical Sciences/P2

2 SC/NSC

DBE/November 2020

INSTRUCTIONS AND INFORMATION

1.

Write your examination number and centre number in the appropriate spaces

on the ANSWER BOOK.

2.

This question paper consists of TEN questions. Answer ALL the questions in

the ANSWER BOOK.

3.

Start EACH question on a NEW page in the ANSWER BOOK.

4.

Number the answers correctly according to the numbering system used in this

question paper.

5.

Leave ONE line between two subquestions, e.g. between QUESTION 2.1 and

QUESTION 2.2.

6.

You may use a non-programmable calculator.

7.

You may use appropriate mathematical instruments.

8.

Show ALL formulae and substitutions in ALL calculations.

9.

Round off your FINAL numerical answers to a minimum of TWO decimal

places.

10.

Give brief motivations, discussions, etc. where required.

11.

You are advised to use the attached DATA SHEETS.

12.

Write neatly and legibly.

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Physical Sciences/P2

3 SC/NSC

DBE/November 2020

QUESTION 1: MULTIPLE-CHOICE QUESTIONS

Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A?D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E.

1.1

Which ONE of the following is the general formula for the alkanes?

A CnH2n B CnH2n-2

C CnH2n+2

D CnH2n+2O

(2)

1.2

The EMPIRICAL FORMULA of hexanoic acid is ...

A C3H6O2 B C6H6O2

C C6H12O2

D C3H6O

(2)

1.3

Which ONE of the following is the CORRECT structural formula for

METHYL ETHANOATE?

H O

HC C O H A

HC H

H

H O

H

CH C C O C H

O

H H

BH C O C C H

H H

O

H H

DH C O C C H

H

H

H H

(2)

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Physical Sciences/P2

4 SC/NSC

DBE/November 2020

1.4

Zinc (Zn) granules react as follows with EXCESS hydrochloric acid solution,

HC(aq):

Zn(s) + HC(aq) ZnC2(aq) + H2(g)

Which ONE of the following combinations of volume and concentration of HC(aq) will result in the highest INITIAL reaction rate for the same mass of zinc granules used? (Assume that the zinc granules are completely covered by the acid in all cases.)

VOLUME HC(aq) (cm3)

A

50

B

100

C

200

D

200

CONCENTRATION HC(aq) (moldm-3)

0,5

1,0

0,1

0,5

(2)

1.5

The role of a catalyst in a chemical reaction is to increase the ...

A yield.

B activation energy.

C heat of reaction.

D rate of the reaction.

(2)

1.6

Consider the equilibrium represented by the balanced equation below:

2CrO

2 4

(aq)

+

2H+(aq)

Cr2O

2 7

(aq)

+

H2O()

H < 0

Which ONE of the following changes to the equilibrium will favour the forward reaction?

TEMPERATURE

A

Decrease

B

Decrease

C

Increase

D

Increase

1.7

The

conjugate

base

of

HPO

2 4

is ...

A OH

B

PO

3 4

C

H2PO

4

D H3PO4

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pH

Increase

Decrease

Increase

Decrease

(2)

(2)

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Physical Sciences/P2

5 SC/NSC

DBE/November 2020

1.8

Which ONE of the following reactions will proceed spontaneously under

standard conditions?

A Ni2+(aq) + H2(g) Ni(s) + 2H+(aq)

B Br2() + 2C (aq) 2Br (aq) + C2(g)

C 2Fe3+(aq) + 2I (aq) 2Fe2+(aq) + I2(s)

D 2Cu+(aq) + Pb2+(aq) 2Cu2+(aq) + Pb(s)

(2)

1.9

The simplified diagram below represents an electrochemical cell used for the

PURIFICATION of copper.

P

Q

Electrolyte

Which ONE of the graphs below represents the CHANGE IN MASS of electrodes P and Q during the purification process?

A

B

Q

P

P

Q

mass

mass

time

time

C

D

Q

P

P

Q

mass

mass

1.10

time Eutrophication in water is caused by ... A algal bloom. B bacterial nitrogen fixation. C an increase in plant nutrients. D a depletion of oxygen concentration.

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time

(2)

(2) [20]

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