Table of Results Volume of Reactants Time, t Experiment Rate(s 1) (cm3) (s) AA Water BB 1 10 0 5 2 8 2 5 3 6 4 5 4 4 6 5 (a) Complete the Table of Results. (b) Write the ionic equation representing the reaction between thiosulphate ion and an acid. (c) Plot a graph of rate (1/t) of reaction as a function of a volume of sodium thiosulphate. (d) With the aid of the graph obtained in (c), comment on the relationship between concentration of sodium thiosulphate and the rate of reaction. (e) Use the data in (a) to find the value of a rate constant, k, given that rate of chemical reaction is expressed by Rate  k [S2O3^2-] [H^+]^2

1. Complete the Table of Results. (0 mk)
2. Calculate the atomic mass of metal M if the concentration of MOH is 5.6 g/dm³. (0 mk)
3. Write the ionic equation representing the reaction between thiosulphate ion and an acid. (0 mk)
4. Identify the element M in MOH. (0 mk)
5. Present your results in a tabular form. (6 mk)
6. Plot a graph of rate (1/t) of reaction as a function of a volume of sodium thiosulphate. (0 mk)
7. With the aid of the graph obtained in (c), comment on the relationship between concentration of sodium thiosulphate and the rate of reaction. (0 mk)
8. Use the data in (a) to find the value of a rate constant, k, given that rate of chemical reaction is expressed by Rate  k [S2O3^2-] [H^+]^2 (0 mk)

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Sample K is a simple salt in the laboratory, which contains one cation and one anion. Perform a systematic qualitative analysis experiment to identify the cation and the anion present in the sample based on the following tests and answer the questions that follow. i) Appearance of sample K ii) Action of heat on sample K in a test tube iii) Action of dilute sulphuric or hydrochloric acid on the solid sample iv) Action of concentrated sulphuric acid on the solid sample v) Flame test vi) Solubility of the sample vii) Confirmatory test for the anion viii) Confirmatory test for the cation (a) Prepare a relevant Table showing the qualitative analysis results. (b) What are the cation and anion present in the unknown sample? (c) Write the reaction equation to indicate what took place in test (vii)

1. Complete the Table of Results. (0 mk)
2. Prepare a relevant Table showing the qualitative analysis results. (0 mk)
3. Write the ionic equation representing the reaction between thiosulphate ion and an acid. (0 mk)
4. What are the cation and anion present in the unknown sample? (0 mk)
5. Write the reaction equation to indicate what took place in test (vii) (0 mk)
6. Plot a graph of rate (1/t) of reaction as a function of a volume of sodium thiosulphate. (0 mk)
7. With the aid of the graph obtained in (c), comment on the relationship between concentration of sodium thiosulphate and the rate of reaction. (0 mk)
8. Use the data in (a) to find the value of a rate constant, k, given that rate of chemical reaction is expressed by Rate  k [S₂O₃²⁻] [H⁺]. (0 mk)

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Sample K is a simple salt in the laboratory, which contains one cation and one anion. Perform a systematic qualitative analysis experiment to identify the cation and the anion present in the sample based on the following tests and answer the questions that follow. i) Appearance of sample K ii) Action of heat on sample K in a test tube

1. Appearance of sample K (0 mk)
2. Action of heat on sample K in a test tube (0 mk)

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