Chemistry 8462: Chemical Changes Topical Past Paper Questions

This question is about materials used to make bicycles. Figure 6 shows a bicycle. Figure 6 Table 3 shows information about two materials used to make bicycle frames. Table 3 Evaluate the use of aluminium alloy and of bamboo for making bicycle frames. Evaluate use of aluminum allo…

This question is about electrolysis. Aluminium is manufactured by electrolysing a molten mixture of aluminium oxide ( $ Al_{2}O_{3} $) and cryolite ( $ Na_{3}AlF_{6} $). 1 Complete the half equation for the reaction occurring at the negative electrode. [1 mark] $$ Al^{3+}~\mathrm…

This question is about acids and alkalis. 1 Explain why the pH of an acid depends on: • the strength of the acid • the concentration of the acid. [4 marks] لـ 2 A student titrated 25.00 cm $ ^{3} $ of hydrochloric acid with 0.100 mol/dm $ ^{3} $ barium hydroxide solution. Table 2…