SASS Chem P3 Planning Compilation

_______________________________________________________________________________________________________________________________________________________________________________________ Page 1 ST ANDREW’S SECONDARY SCHOOL NAME CLASS DATE CHEMISTRY 6092 PRACTICAL PAPER – PLANNING Compilation from other schools’ prelim papers 1 CHANGKAT CHANGI SECONDARY SCHOOL (2020) According to Chemistry textbooks, the rate of a reaction can be affected by the reactivity of the metal used. (a) Outline a method that you could use to determine the reactivity of metals on the rate of reaction. You are only provided with samples of copper, iron, magnesium and zinc metal. You can assume all the apparatus and reagents normally found in a school laboratory are available. You should include in your answer the measurements / observation you would take / make, and explain how your measurements / observation would show how the reactivity of metals used would affect the rate of a reaction. You may wish to use a labelled diagram to illustrate your answer. [4] (b) What is / are the variable(s) that should be kept constant in your method? [2] 2 CHUNG CHENG HIGH SCHOOL (YISHUN) (2020) A sample of copper(II) oxide powder is mixed with some carbon powder. Given 10 g of the contaminated sample, outline a method by which the percentage purity of copper(II) oxide in the sample can be determined. You can assume all the apparatus and reagents normally found in a school laboratory are available. In your method you should note any assumptions that you make, include the measurements you would take and explain how you would use your results to determine the percentage purity of copper(II) oxide in the sample. You may wish to use a labelled diagram to illustrate your answer. [5] 3 DAMAI SECONDARY SCHOOL (2020) Sodium carbonate is thermally stable while sodium hydrogencarbonate decomposes on heating. 2NaHCO3 ® Na2CO3 + CO2 + H2O You are given 1 g of an impure solid sample of sodium hydrogencarbonate which contains sodium carbonate as the only impurity. Without using any other chemicals, outline a method to determine the percentage by mass of sodium hydrogencarbonate present in the sample. In your method you should note any assumptions that you make, include the measurements you would take and explain how you would use your results to determine the percentage by mass of sodium hydrogencarbonate in the provided sample. You can assume all the apparatus normally found in a school laboratory are available. [6]

_______________________________________________________________________________________________________________________________________________________________________________________ Page 2 4 GREENRIDGE SECONDARY SCHOOL (2020) Copper(II) sulfate crystals have the formula CuSO4.xH2O. Plan an experiment to determine the value x in the formula above