Calcium carbonate reacts with hydrochloric acid. The reaction gives off carbon dioxide gas. Line X on the graph shows the volume of carbon dioxide formed against time when 100 cm3…

Which statements describe a role of mitosis?1 asexual reproduction2 growth of a cell3 repair of cells4 stem cell division Answer: 21) A 1 – mitosis does not involve a mate.…

Rearrange the formula = a/b=c/d+e/f e to make f the subject? Answer: 20) C a = c + eb d f Let us first solve the right hand side (RHS).…

A defibrillator provides an electric shock to a heart to restore its normal rhythm. The energy to do this is 125 J, at a steady voltage of 500 V, for…

What volume of a 0.10 mol dm–3 solution of NaOH is needed to neutralise 30 cm3 of a 0.20 mol dm–3 aqueous solution of a diprotic acid? Answer: 18) C…

Which of the following statements could describe the result of a single mutation of a gene coding for a protease enzyme in a fertilised human egg cell?1 A new allele…

Identify the correct products of electrolysis of the following electrolytes Answer: 14) C A important aspect you have to take into consideration before answering this question is the terms being…

Which of the following molecules are involved in both aerobic and anaerobic respiration in ahealthy human?1 carbon dioxide2 glucose3 lactic acid Answer: 13) B 1 – carbon dioxide is produced as…

The diagram represents the circular cross-section of an artery with external diameter d of 1.6 cm. The thickness t of the artery wall is 1 mm. What is the internal…