This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Hier is die antwoorde op die vrae: 7. Complete the following sentences: a) Your sister has been given a very expensive bracelet. It is shiny and the metal looks similar to the expensive metal covering some spoons. It is probably made of silver. b) You have found some electric wire. It has a shiny orange colour. The metal is most probably copper. 8. Which of these materials are non-metals? Clay, polymers, fabric, oxygen. 9. Which of these objects will be attracted to a magnet? Iron nail. 10. a) Why would you not make water pipes from silver? Silver is too expensive and too soft for water pipes. b) What metal would you choose to make water pipes? Copper or galvanized steel. 11. You see a man painting a metal fence. Besides making his fence look very nice, why else do you think he would be painting it? Painting the fence prevents rust (corrosion) by protecting the metal from moisture and oxygen. 12. Metals are good conductors of heat. Name one metal object that conducts heat when being used. A cooking pot or frying pan. 13. What happens to clay when it is fired? When clay is fired, it becomes hard, strong, and waterproof. 14. Explain why fillers are added to paint. Fillers are added to paint to increase its volume, improve consistency, and reduce cost. 15. Fill in the missing words: a) Stitching is the use of thread to join two materials. b) Weaving is making something by interlacing threads over and under each other. 16. Name the three methods used below to make baskets, hats or mats. Weaving, coiling, plaiting/braiding. 17. Name two methods used to make baskets. Weaving and coiling. 18. a) Explain how plaster of Paris changes when water is added to it. When water is added to plaster of Paris, it undergoes a hydration reaction, forming gypsum, which then sets and hardens. b) Explain what plaster of Paris is used for. Plaster of Paris is used for casts for broken bones, moulds, sculptures, and decorative elements. c) State two properties of plaster of Paris that people look for when using it. It sets quickly and hardens to a smooth finish. 3 done, 2 left today. You're making progress.