Bronze is a mixture of

(a)(i) What is the common name given to the group VII elements?

(ii) Name the hydrides of the first two elements in group VII.

(iii) State three chemical properties of group VII elements.

(b) Copy and complete the following table:

(c)(i) Define each of the followinc processes: I. nuclear fission; II. nuclear fusion.

(ii) Give one use of each process in (c)(i).

(d)(i) List three types of radiation that are produced during radioactivity.

(ii) Arrange the radiations listed in

(d)(i) in order of increasing: I. penetrating power; II. ionizing power.

(a)(i) Define each of the following terms: I. normal salt. II. acid salt.

(ii) Tetraoxosulphate (VI) acid and sodium hydroxide react to produce salt and water. Write a balanced chemical equation fir the formation of: I. a normal salt; II. an acid salt.

(b)(i) Explain briefly the term acid-base indicator.

(ii) Copy and complete the following table.

(iii) For each of the following titrations, state the most suitable indicator: I. strong acid against strong base; II. strong acid against weak base; iii. weak acid against strong base.

(c) Baking soda and hydrochloric acid react according to the following equation:

NaHCO\(_{3(aq)}\) + HCI\(_{(aq)}\) ---> NaCl\(_{(aq)}\) CO\(_{2(g)}\) + H\(_2\)O\(_{(l)}\). Calculate the mass of baking soda that would produce 10g of ccrbon (IV) oxide. [H = 1.00, C = 12.0, 0 = 16.0, Na = 23.0]

(d) Give a reason why a given mass of sodium hydroxide pellets cannot be used to prepare a standard solution.

NaHCO\(_3\) + HCI --> NaCI + CO\(_2\) + H\(_2\)O

84g NaHCO\(_3\)  --> 44g CO\(_2\)

Xg --> 10g CO\(_2\)
Xg = \(\frac{84 \times 10}{44}\)

= 19.09g

= 19.1g.

(d) give a reason why a given mass of sodium hydroxide pellets cannot be used to prepare a standard solution: Sodium hydroxide absorbs water/deliquescent and absorbs carbon IV oxide from air/and this would make mass taken unreliable/add to its mass.

(a)(i) Define the term standard electrode potential.

(ii) State three factors that affect the discharge of ions during electrolysis.

(iii) State two functions of a salt bridge in an electrochemical cell.

(b) Describe briefly what happens when a solution of copper (II) tetraoxosulphate (VI) is electrolyzed using copper electrodes.

c) Calculate the mass of copper deposited at the cathode when a current of 0.2A is passed through a solution of copper (II) tetraoxosulphate (VI) for 35 minutes using copper electrodes. [H = 1.00, O = 16.0, S = 32.0, Cu = 64.0, IF = 96,500C]

(d)(i) State three characteristics of a catalyst.

ii) Name one manufacturing process in which each of the following metals is used as catalyst: I. iron; II. nickel; Ill. platinum.
c-NA