A test tube containing a straight chain organic acid X, ethanol and a catalyst is heated in a water bath as illustrated below. Organic compound Y is produced according to the following equation: 2.1 Give a reason why the test tube is heated in a water bath instead of directly over the flame. (1) … Read more
1.1 Which ONE of the following is the structural formula of the functional group of the KETONES? 1.2 Which ONE of the formulae below represents an ALKANE? A C2H4 B C5H10 C C14H30 D C8H14 (2) 1.3 Consider the organic compound below. The IUPAC name of this compound is … A 2,3-dimethyl … Read more
10.1 In the simplified AC generator below, the coil is rotated clockwise. 10.1.1 In which direction does the induced current flow in the coil?Choose from: X to Y or Y to X. (1) 10.1.2 On which principle or law is the working of the generator based? (1) 10.1.3 State the energy conversion that takes place … Read more
Learners perform an experiment to determine the emf (ε) and the internal resistance (r)of a battery using the circuit below. 9.1 Which variable has to be kept constant in the experiment? (1) 9.2 Refer to the graph. 9.2.1 Write down the value of the internal resistance of the cell. (2) 9.2.2 Calculate the emf of … Read more
The battery in the circuit diagram below has an emf of 12 V and an internal resistanceof 0,5 Ω. Resistor R has an unknown resistance. 8.1 What is the meaning of the following statement?The emf of the battery is 12 V. (2) The reading on the ammeter is 2 A when switch S is OPEN. … Read more
Three small identical metal spheres, P, S and T, on insulated stands, are initiallyneutral. They are then charged to carry charges of -15 x 10-9 C, Q and +2 x 10-9 Crespectively, as shown below. The charged spheres are brought together so that all three spheres touch each otherat the same time, and are then … Read more
The diagram below, not drawn to scale, shows a vehicle with a mass of 1 500 kgstarting from rest at point A at the bottom of a rough incline. Point B is 200 m verticallyabove the horizontal. The total work done by force F that moves the vehicle from point A to point B in … Read more
4.1 Define the term momentum in words. (2) 4.2 Will the girl-roller-skate combination move TO THE RIGHT or TO THE LEFT after the parcel is thrown?NAME the law in physics that can be used to explain your choice of direction. (2) The total mass of the roller skates is 2 kg. 4.3 Calculate the mass … Read more
In a competition, participants must attempt to throw a ball vertically upwards pastpoint T, marked on a tall vertical pole. Point T is 3,7 m above the ground. Point T may,or may not, be the highest point during the motion of the ball. One participant throws the ball vertically upwards at a velocity of 7,5 … Read more
A block, of mass 8 kg, is placed on a rough horizontal surface. The 8 kg block, which isconnected to a 2 kg block by means of a light inextensible string passing over a lightfrictionless pulley, starts sliding from point A, as shown below. 2.1 State Newton’s Second Law in words. (2) 2.2 Draw a … Read more