question7

Study the illustrations of the diagrams below and answer the questions which follow. 7.1 Define the term compound. (2) 7.2 Choose from the different diagram illustrations above ONE that best describes each of the following substances. Write down the letter only. 7.2.1 Diamond (1) 7.2.2 Carbon dioxide (1) 7.2.3 Helium (1) 7.2.4 Magnesium (1) 7.2.5 … Read more

7.1 The diagram below shows different points on a longitudinal wave. 7.1.1 Write down the labels for A, B and C. (3) 7.1.2 Does this type of wave require a medium to propagate? Write down: YES or NO (1) 7.2 The diagram shows TWO sound waves measured for the same time interval. 7.2.1 Which ONE … 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

A learner is investigating a certain phenomenon of light. He viewed red light through a single slit and observed the pattern that was formed on a screen. He repeated the experiment using blue light and observed the pattern on a screen again. 7.1 Name the phenomenon that the leaner is investigating. (1) 7.2 Draw separate … Read more