9.1 Consider the redox reaction given below. 9.1.1 Define oxidation reaction in terms of electron transfer. (2) Write down the: 9.1.2 Formula of the reducing agent. (2) 9.1.3 Reduction half reaction (2) 9.2 Consider the redox reaction below: 9.2.1 Determine the oxidation number of nitrogen (N) in . (2) 9.2.2 Balance the above chemical equation … Read more
The types of electromagnetic radiation are arranged according to frequency in the tablebelow. 8.1 How are electromagnetic waves generated? (1) 8.2 What type of electromagnetic radiation has the highest energy? (1) 8.3 Explain the answer to QUESTION 8.2. (2) 8.4 A certain type of electromagnetic radiation has a wavelength of 600 x 10-10 m. 8.4.1 … Read more
8.1 Consider the chemical reaction below: 8.1.1 Define a base according to a Lowry-Bronsted theory. (2) 8.1.2 Write down ONE conjugate acid-base pair in the equation. (1) 8.1.3 Is the reaction mixture ACIDIC or ALKALINE at the completion of the reaction? Give a reason for your answer. (2) 8.1.4 Write down the formula of a … Read more
Experiments were done to investigate the effect of temperature on the speed of sound.One person beat a drum while another person, who was standing 50 m away from thesound source, recorded the time travelled by the sound. They performed the experiment at different temperatures at different times of the day.They recorded their findings in the … Read more
Study the two transverse waves, P and Q, as shown below. 6.1 Write down ONE difference and ONE similarity between wave P and wave Q. (2) 6.2 For wave pattern P, write down: 6.2.1 Two points that are out of phase (1) 6.2.2 The amplitude of the wave (1) 6.3 Define the term frequency of … Read more
A skateboarder, starting from the top of a ramp 4,5 m above the ground, skates downthe ramp, as shown in the diagram below. The mass of the skateboarder and his boardis 65 kg. Ignore the effects of friction. 5.1 Define the term gravitational potential energy in words. (2) 5.2 Calculate the gravitational potential energy of … Read more
Two cars, A and B, are moving at speeds of 15 m·s-1 and 30 m·s-1 in the samedirection. They are side by side when both drivers observe an obstruction ahead ofthem, as shown in the diagram below. Both drivers apply their brakes and accelerate at –4,5 m·s-2 until both cars come torest. Ignore the reaction … Read more
The diagram below shows the positions of an athlete at different time intervals during arace. 3.1 Distinguish between motion with uniform velocity and uniformly accelerated motion. (4) 3.2 What type of motion (motion with uniform velocity or uniformly accelerated motion) is represented by the following intervals? 3.2.1 A to B (1) 3.2.2 B to C … Read more
The fertiliser ammonium sulphate ((NH4)2SO4) is produced from the reaction ofsulphuric acid (H2SO4) and ammonia (NH3) according to the balanced equation: 2 kg of sulphuric acid and 58,82 moles of ammonia are available to produce thefertiliser. 7.1 Define the term limiting reagent. (2) 7.2 Calculate the maximum mass of ammonium sulphate that can be produced … Read more
6.1 Methyl propanoate is an organic compound with the following percentagecomposition: 54,55% C ; 9,09% H ; 36,36% O The molar mass of the compound is 88 g∙mol-1. 6.1.1 Define the term empirical formula. (2) 6.1.2 Determine, by calculation, the empirical formula. (6) 6.1.3 Determine the molecular formula. (2) 6.2 Learners prepare a solution of … Read more