Gr12 test yourself

Ball A is projected vertically upwards at a velocity of 16 m∙s-1 from the ground. Ignore the effects of air resistance. Use the ground as zero reference.

1.Calculate the time taken by ball A to return to the ground.(2)
2.Sketch a velocity-time graph for ball A.(2)

Show the following on the graph:

(a) Initial velocity of ball A (1)
(b) Time taken to reach the highest point of the motion (1)
(c) Time taken to return to the ground (1)

ONE SECOND after ball A is projected upwards, a second ball, B, is thrown vertically downwards at a velocity of 9 m∙s-1 from a balcony 30 m above the ground. Refer to the diagram below.
Calculate how high above the ground ball A will be at the instant the two balls pass each other. (6)

The letters A to D in the table below represent four organic compounds.
Use the information in the table to answer the questions that follow.
1.1.Write down the:
1. Letter that represents a ketone [1]
2.Structural formula of the functional group of compound C [1]
3.General formula of the homologous series to which compound A belongs [1]
4.IUPAC name of compound A [3]
5.IUPAC name of compound B [2]
1.2.Compound D is a gas used in cigarette lighters
1.To which homologous series does compound D belong? [1]
2.Write down the STRUCTURAL FORMULA and IUPAC NAME of a structural isomer of compound D [4]
3.Is the isomer in QUESTION 1.2.2 a CHAIN, POSITIONAL or FUNCTIONAL isomer? [1]
1.3.Compound D reacts with bromine (Br2) to form 2-bromobutane. Write down the name of the:
1.Homologous series to which 2-bromobutane belongs [1]
2.Type of reaction that takes place [1]
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The flow diagram 1 below shows two organic reactions. The letter P represents an organic compound.

Physical Sciences BREAK 1.0's photo.

Use the information in the flow diagram to answer the questions that follow. Write down the:
1.Type of reaction of which Reaction 1 is an example (1)
2.STRUCTURAL FORMULA of the functional group of ethyl propanoate (1)
3.IUPAC name of compound P (1)
Reaction 2 takes place in the presence of an acid catalyst and heat. Write down the:
4.Type of reaction of which Reaction 2 is an example (1)
5.NAME or FORMULA of the acid catalyst (1)
6.STRUCTURAL FORMULA of the alkene (2)

Physical Sciences BREAK 1.0's photo.

Write down the: Diagram 2
1.STRUCTURAL FORMULA of the monomer that is used to prepare the above polymer (2)
2.Type of polymerisation reaction (ADDITION or CONDENSATION) that is used to prepare this polymer (1)
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Physical Sciences BREAK 1.0's photo.

Four compounds of comparable molecular mass are used to investigate the effect of functional groups on vapour pressure. The results obtained are shown in the table below.

1.Define the term functional group of an organic compound. (2)

2.Which ONE of the compounds (A, B, C or D) in the table has the:

2.1.Highest boiling point

(Refer to the vapour pressures in the table to give a reason for the answer.)

2.2.Weakest intermolecular forces (1)

2.3.Refer to the type of intermolecular forces to explain the difference between the vapour pressure of compound A and compound B. (3)

2.4.The vapour pressures of compounds C and D are much lower than those of compounds A and B. Name the type of intermolecular force in A and B that is responsible for this difference. (1)

2.5.Briefly explain the difference in vapour pressure between compound C and compound D (2)

2.6.During a combustion reaction in a closed container of adjustable volume, 8 cm3 of compound A (butane) reacts in excess oxygen according to the following balanced equation:

2C4H10(g) + 13O2(g) → 8CO2(g) + 10H2O(g)

If the initial volume of the oxygen in the container was 60 cm3, calculate the TOTAL volume of the gases that are present in the container at the end of the reaction. All the gases in the container are at the same temperature and pressure. (5)

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Published by Chipa Maimela

2019 Science and Technology SA Blog Award runner 2017 MTN Award Business Incubation runner 2017 MTN Award Best education solution 2016 Science and Technology SA Blog Award runner 2019/2020 NSTF SOUTH 32 Award nominee View all posts by Chipa Maimela