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HSC Chemistry production of materials

practise 4

practise 4 production of materials

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HSC Chemistry cd2p4-online

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practise 4

Question 1 Many people want combustion of fossil fuels phased out because: (A) their combustion generates greenhouse gases (B) their supplies are dwindling (C) their combustion contributes to acid rain (D) all of the above Question 2 The reaction below shows a redox reaction.

2 4 2 4Ca s +H SO aq H g +CaSO aq

What species is reduced? (A) Ca (B) H+

(C) H2

(D) Ca2+

Question 3 Which of the following is not a condensation polymer? (A) Nylon (B) Glucose (C) Protein (D) DNA Question 4 Which of the following cannot react with bromine quickly? (A) CH3CH=CH2

(B) CH3CH2CH=CHCH3

(C) CH3CH2OH (D) CH2=CH2



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Question 5 The equation shows a nuclear reaction.

214 214

82 83Pb Bi x

What is x? (A) 0

-1e (B) 0

1e (C) 1

-1e (D) 1

1e Question 6 Distinguish between the terms ‘oxidant’ and ‘reductant’. Question 7 In each of the following reactions, identify the oxidant and the reductant. (a) + 2+

2Ca s +2H aq Ca aq +H g

(b) + +

22Na s +2H aq 2Na aq +H g

(c) 2+ 3+2Al s +3Fe aq 2Al aq +3Fe s

(d) - -

2 2Cl g +2Br aq 2Cl aq +Br g

Question 8 For each of the equations in Question 7, state the direction of electron flow. (a) (b) (c) (d)



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Question 9 Write an equation to show a reaction in which silver ions are the oxidant (they get reduced) and zinc atoms are the reductant (they get oxidised). Question 10 Silver ornaments gradually develop a black coating of silver sulphide on the surface. One way of removing this coating is to wrap the ornament in aluminium foil and immerse it in an aqueous solution of sodium hydrogen carbonate. Write equations to show: (a) the oxidation of the aluminium (b) the reduction of the surface coating of silver sulphide (c) the full redox reaction for this process. Question 11 Pieces of copper metal are placed in a solution of silver nitrate. Silver is deposited in the solution. (a) Identify the more active metal. (b) Use a half equation to show oxidation. (c) Use a half equation to show reduction (d) Identify the oxidant. Question 12 Write balanced equations and state the oxidant and reductant in each case for the following metal extraction processes: (a) The extraction of lead from its ore, galena (lead sulfide). (b) The extraction of zinc from its ore, sphalerite (zinc sulfide).



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Question 13 (a) Assess the importance of plants in the production of polymers which can be of economic

importance to humans. (b) Identify a biopolymer and the technology used to produce it. Question 14 Ethanol is produced in an addition reaction of an alkene. (a) Name the alkene used in this process. (b) Write a balanced equation for the process. (c) Name the catalyst used in this process. (d) Why is a catalyst necessary for this reaction to proceed? Question 15 The two groups of polymers are addition polymers and condensation polymers. (a) Define each of the terms in italics. (b) Give an example of each type of polymer. Question 16 Radioactive isotopes are currently used in medicine and industry. (a) State one example of radioactive isotope used in medicine and explain how it is used in

relation to its properties. (b) State one example of radioactive isotope used in industry and explain how it is used in

relation to its properties. (c) What problems can be associated with using radioactive isotopes? (d) State ONE instrument that can be used to detect radioactivity?



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