question10

10.1 The experimental set-up below is used in a Grade 10 class to demonstrate the electrical conductivity of a sodium chloride solution. 10.1.1 Define the term electrolyte. (2) 10.1.2 Write down the formula of ions present in this set-up. (1) 10.1.3 What will happen to the brightness of the bulb in the set-up above if … Read more

10.1 A small, metal sphere A carrying a charge of +2 x 10-9 C is placed on aninsulated stand. 10.1.1 How does the number of electrons compare with the number of protons in sphere A? Choose from LESS THAN, GREATER THAN or EQUAL TO. (1) 1013 electrons are now added to sphere A 10.1.2 Calculate … Read more

10.1 The mining industry contributes towards the South African economy. Gold is one of the minerals that is being mined in South Africa. 10.1.1 Write down the name of the location of the major mining activity in South Africa. (1) The following chemical reaction occurs during the final steps in the recovery process of gold. … Read more

Two identical insulated spheres, X and Y, suspended by threads from a ceiling, areheld at a small distance apart, as shown in the diagram below. Sphere X carries a charge of + 4 x 10-18 C, while sphere Y has an excess of30 electrons. 10.1 Calculate the magnitude of the charge on sphere Y. (3) … Read more

10.1 A learner sets up the circuit below to investigate the relationship between current and potential difference across the ends of a conductor. She closes the switch and records the ammeter and voltmeter readings. She repeats the experiment three times; each time she increases the number of cells in the circuit. Then she reads and … Read more

Two points, P and T, are situated 3 mm apart in the electric field of positive charge Q, as shown below 10.1 Draw the electric field pattern around charge Q. (2) The magnitude of the electric field at point P is 4 x 106 N·C-1 and at point T themagnitude is 2,5 x 105 N·C-1. … Read more

Gold and iron extraction are important mining processes in South Africa. Refining takesplace according to the following reactions: Gold is dissolved using cyanide ions (CN–) to extract it from the ore: 4Au(s) + 8NaCN(aq) + 2H2O(ℓ) + O2(g) → 4NaAu(CN)2(aq) + 4NaOH(aq) Iron(lll)oxide is burned in a furnace in the presence of CO: Fe2O3(s) + … Read more