Science Combined 0653: C8. Acids, bases and salts Topical Past Paper Questions

A student investigates solid zinc carbonate. When heated, zinc carbonate breaks down to make zinc oxide and carbon dioxide gas. ## Procedure The student: step 1 records in Table 3.1 the mass of a clean dry test-tube $M_{1}$ step 2 adds solid zinc carbonate to the test-tube step 3…

(a) A student investigates the reaction between aqueous sodium hydroxide, NaOH, and dilute hydrochloric acid, HCl. The apparatus is shown in Fig. 4.1. Fig. 4.1 (i) Write the balanced symbol equation for the reaction shown in Fig. 4.1. Include state symbols. (ii) State the colour…

(a) Fig. 5.1 is a pie chart showing the composition of clean air. Fig. 5.1 Identify the gases in clean air by completing the key for the pie chart shown in Fig. 5.1. Key (c) Carbon dioxide is a gas. (i) Carbon dioxide forms during the thermal decomposition of calcium carbonate. C…