Chemicals in Industry

Question 4:A Form 4 student found his bicycle tyre punctured on his way home from school. Then, he went to the workshop to repair his tyres. When the mechanic was repairing the tyre, the student discovered that the rubber tube of the tyre he was holding has different elasticity compared to the coagulated latex in … Read more

Question 3:Superconductor alloys have many uses now and in the future. Photograph 3 shows one of the uses of superconductor alloy in Maglev trains.(a) How is a superconductor alloy used in the construction of the Maglev train?(b) Give two other uses of superconductor alloys in daily life.(c) In your opinion, can the superconductor alloy be … Read more

Question 1:Photograph 1 shows two objects. (a) What is the type of alloy used to manufacture P and Q? (b) Give two other uses of the alloy used to manufacture P and Q. (c) Why is a bronze block stronger than a copper block? (d) In your opinion, can the alloy which is used to … Read more

Question 1:Name two natural polymers and synthetic polymers and their monomers. Answer: Question 2:Compare the properties of natural rubber and vulcanised rubber. Answer: Question 3:Describe how vulcanised rubber is produced from natural rubber. Answer:Heating natural rubber with sulphur• Natural rubber is heated at a temperature between 100°C to 150°C at high pressure • 3% to … Read more

Question 1:What is the main component in glass and ceramic? Answer:Glass: silica Ceramic: clay Question 2:State three applications of glass and ceramic. Answer:Glass:• to make laboratory apparatus such as beakers and conical flasks • to make cooking utensils such as glass pot, casserole dish • to make food container such as glass bottle Ceramic:• to … Read more

Question 1:Give two examples of alloy containing copper metal. Answer:Bronze / Brass / Duralumin Question 2:Draw the arrangement of atoms in an alloy and a pure metal, then relate the arrangement of the atoms to the properties of pure metal. Answer: • Pure metal: atoms in the pure metal are arranged in an orderly manner … Read more

Question 3:Table 1 shows the characteristics of plastic A and plastic B.Table 1(a) State the type of plastic A and B. [2 marks](b) State one example of plastic A and B. [2 marks](c) Which plastic can be recycled? [1 mark](d) Which plastic is suitable to make as the handle of an iron? [1 mark]Answer:(a)A: ThermoplasticB: … Read more

Question 1:Table 1.1 shows two types of product made of rubber.(a) Complete Table 1.1. [4 marks]Table 1.1(b) Table 1.2 shows the characteristics of plastic A and plastic B.Table 1.2In Table 1.2, state the type of plastic A and plastic B. [2 marks]Answer:(a) (b)