Test yourself GR11

Posted: March 12, 2016 in Uncategorized

Consider the following molecules and answer the questions that follow.

Consider the following molecules and answer the questions that follow.
A.NH3
B.CO2
C.C2H2
D.H20
E.BH3
Which molecule:
1.1.1 Contains a triple bond? [1]
1.2 Is trigonal planar? [1]
1.3 Is angular in shape and contains a centre atom with two lone pairs? [1]
2.Which TWO molecules can form a dative covalent bond with a hydrogen ion? [2]
1. Draw a Lewis structure of the CO2 molecule. [2]
2 Briefly explain why the bonds shown in your answer to
QUESTION .1 are considered to be “polar covalent”. Refer to the difference in electronegativity of the atoms involved. [4]
[11]

During a mountain climbing exercise, Ferial, mass 50 kg, is suspended from an inelastic piece of nylon rope, fixed to a vertical cliff at X on the cliff. She pushes her legs against the cliff so that they make an angle of 45° with the cliff, as indicated in figure. The angle that the rope makes with the cliff is 20°.
Point Y is in equilibrium.
2.1 Explain what is meant by Point Y is in equilibrium. [1]
2.2 Draw a FORCE DIAGRAM showing all the forces acting on point Y. [3]
2.3 Determine by means of ACCURATE CONSTRUCTION and MEASUREMENT.
(use the scale 10 mm: 50 N and indicate at least TWO angles):
2.3.1 The magnitude of the force which the rope exerts on her.[4] 2.3.2 The magnitude of the force exerted by her legs. [4]
[12]

Physical Sciences BREAK 1.0's photo.

A 6 kg block on a horizontal rough surface is joined to a 2 kg block by a light, inelastic string running over a frictionless pulley. The frictional force between the 6 kg block and the table is 11,76 N. A downwards force of 2 N is applied to the 2 kg block as indicated in the diagram below.
1. State Newton’s Second Law of motion in words. (2)
2.Draw a free-body diagram showing ALL the forces acting on the 6 kg block.(4)
3.Calculate:
3.1. The magnitude of the acceleration of the 6 kg block. (5)
3.2.The magnitude of the tension (T) in the string connecting the two blocks.(2)

4. The rough surface is replaced by a smooth frictionless surface.
How will this change affect the answer in QUESTION 3.1? Write only INCREASES, DECREASES or REMAINS THE SAME. (1)[14]

Physical Sciences BREAK 1.0's photo.
Comments
  1. www.mbaliehz@gmail.com says:

    1.1 c
    1.2 A
    1.3 A
    2. E
    Sent from my BlackBerry®

    Like

  2. Sakwa Gladys says:

    1.1 C
    1.2. E
    1.3 B

    Like

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