TEST

Grade 12 Physical Sciences Exam

QUESTION 1

1.1 You can replace two forces, P and Q, with a single force of 7 N. If the magnitude of force P is 3 N, which one of the following can be the magnitude of force Q?

A 2 N

B 3 N

C 8 N

D 13 N

(2)

1.2 The formula of the organic product formed when methanol reacts with ethanoic acid is:

A C2H4O2

B C3H5O2

C C3H6O2

D C4H8O2

(2)

1.3 The fermentation of sugar solutions using enzymes in yeast can be represented as follows:

C6H12O6 (aq) + Enzymes → CO2 (g) + X

A Alkane

B Alcohol

C Ester

D Carboxylic acid

(2)

1.4 A bucket is at rest on a table. Which ONE of the following is the reaction force to the weight of the bucket, as described by Newton’s Third Law?

A Force of the table on Earth

B Force of the bucket on Earth

C Force of the bucket on the table

D Force of the table on the bucket

(2)

1.2 The formula of the organic product formed when methanol reacts with ethanoic acid is:

A C₂H₄O₂

B C₃H₆O₂

C C₃H₈O₂

D C₄H₈O₂

(2)

1.3 The fermentation of sugar solutions using enzymes in yeast can be represented as follows:

C₆H₁₂O₆ → CO₂ + X

A Alkane

B Alcohol

C Ester

D Carboxylic acid

(2)

1.4 A bucket is at rest on a table. Which ONE of the following is the reaction force to the weight of the bucket?

A Force of the table on Earth

B Force of the bucket on Earth

C Force of the bucket on the table

D Force of the table on the bucket

(2)

QUESTION 2

Two workers, Tyreeq and Joe, are moving two trolleys M and N connected by a light inextensible string.

2.1.1 State Newton’s Second Law of Motion in words. (2)

2.1.2 Draw a labelled free-body diagram of all the forces acting on trolley M. (5)

2.1.3 Calculate the acceleration of the system. (6)

2.1.4 Calculate the tension in the string. (1)

QUESTION 3

3.1 State the law of conservation of linear momentum in words. (2)

3.1.1 Say whether the total momentum of the system changes. (1)

3.1.2 Calculate the velocity of the 2 kg trolley after the spring expands. (6)

3.2.1 What is the total momentum of the system before the parcel is thrown? (2)

3.2.2 Calculate the velocity of the boat immediately after the parcel was thrown. (6)

QUESTION 4

4.1 Define the term projectile. (2)

4.2 Calculate the magnitude of the average force exerted on the ball by the wall. (3)

4.3 By considering the vertical motion of the ball, calculate the time it takes to reach the wall. (3)

4.4.1 Calculate the change in momentum of the ball due to the collision. (5)

4.4.2 Explain why the horizontal component of velocity remains constant. (2)

QUESTION 5

5.1 Give a balanced equation for the reaction that occurred in X. (2)

5.2 Explain, referring to the polarity of the reactants, why bromine gas dissolves completely in xylene. (2)

5.3 Give a balanced equation for the reaction in Y. (3)

5.4 Classify the type of reaction that occurs in Y. (2)

QUESTION 6

6.1 Give the IUPAC name of the compound. (2)

6.2 To what homologous series does this compound belong? (2)

6.3 Write the equation for the reaction with hydrogen and platinum catalyst. (2)

6.4 What is the name given to the reaction that takes place? (2)

6.5 What is the name of the product formed? (2)

QUESTION 7

7.1 Write down the molecular formula of pentane. (2)

7.2 Write the structural formula of propene. (2)

TOTAL: 100 MARKS

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