M. Rahman C1 TOPIC 4 1) Why are gold and platinum found in the ground as uncombined elements? Answers Unreactive-don’t react with oxygen.

M. Rahman C1 TOPIC 4 2) A rock which contains enough metal to be economically viable to extract is called… Answers Ore

M. Rahman C1 TOPIC 4 3) The process by which iron extracted from iron oxide on an industrial scale is? a) Electrolysis b) Reduction by carbon Answers Reduction by carbon Bonus: Why Expert answer; Below carbon in reactivity series so does not require electrolysis. Avoid electrolysis when possible because requires a lot of energy and is expensive

M. Rahman C1 TOPIC 4 4) Reactive metals in rocks are mainly found with … a)Chlorine b) Oxygen c) Carbon dioxide Answers b) Oxygen

M. Rahman C1 TOPIC 4 5) Name two metals found uncombined in the earth crust Answer Any two from Gold, silver, platinum

M. Rahman C1 TOPIC 4 6) Why are some metals found uncombined? Answer Unreactive

M. Rahman C1 TOPIC 4 7) Reduction is…. Answer Loss of oxygen

M. Rahman C1 TOPIC 4 8) Oxidation is ….. Answer gain of oxygen

M. Rahman C1 TOPIC 4 9) What are the two methods of extracting metals from their ore… Answer Electrolysis Heating with carbon (reduction)

M. Rahman C1 TOPIC 4 10) What determines the method used for extraction of metals. a)Reactivity b) Conductivity c) How strong it is Answer a) Reactivity.

M. Rahman C1 TOPIC 4 11) Which of the following metals are extracted using Electrolysis. a)Aluminium b)Copper c) Iron Answer a) Aluminium

M. Rahman C1 TOPIC 4 12) Why is aluminium not extracted by heating with carbon? Answer Aluminium above carbon in reactivity series. So carbon cannot take an oxygen away from a metal (aluminium) which is more reactive

M. Rahman C1 TOPIC 4 13) Why would you not use electrolysis to extract iron. Answer Electrolysis uses a lot of energy and more expensive. No need to use it when it is not required

M. Rahman C1 TOPIC 4 14) Which of the following metals are the most reactive. a)Platinum b) Potassium c) Zinc Answer a) Potassium

M. Rahman C1 TOPIC 4 15) Give three properties of metals (3). Answer a)Strong b) Malleable c) Good conductor of heat and electricity

M. Rahman C1 TOPIC 4 16) Why is aluminium used for aeroplanes (2) Answer Low density Corrosion resistance.

M. Rahman C1 TOPIC 4 17) Why is copper used for electrical cables (2). Answer Good conductor of electricity. Has high melting point.

M. Rahman C1 TOPIC 4 18) Why is copper used for pipes in plumbing (2). Answer Does not react with water-so no corrosion.

M. Rahman C1 TOPIC 4 19) Why are gold and silver used for Jewellery Answer a)Soft-so can be easily shaped b)Shiny-looks good.

M. Rahman C1 TOPIC 4 20) Why are gold and silver used for Jewellery Answer a)Soft-so can be easily shaped b)Shiny-looks good.

M. Rahman C1 TOPIC 4 21) Describe the structure of metals (3). Regular arrangement of identical atoms. The layers of atoms can slide over each other, which makes them malleable and easily shaped

M. Rahman C1 TOPIC 4 22) How can metals like iron be made stronger? Answer Convert into an alloy

M. Rahman C1 TOPIC 4 23) Define an alloy. Answer A mixture of two or more metals or a metal and non- metal.

M. Rahman C1 TOPIC 4 24) Explain why alloys are strong? Answer Alloys are made up of atoms of different sizes. This upsets the layers. The layers cannot slide past each other, making alloys harder.

M. Rahman C1 TOPIC 4 25) Give an example of smart alloy, describing its properties. Answer Nitinol-shape memory alloy. It is an alloy of nickel and titanium. If you bend it, it will go back to its original shape when heated.

M. Rahman C1 TOPIC 4 26) Give at least three advantages of recycling metals. Answer 1)There is a limited amount of metals in the earth-recycling conserves that. 2)Saves energy, since mining and extraction require huge amounts of energy 3) Costs less because energy costs money. 4) Reduces the amount of rubbish that goes into landfills. 5) Less pollution because less fossil fuels burnt to provide energy.

M. Rahman C1 TOPIC 4 27) Give one disadvantages of recycling metals. Answer Recycling is not free- cost involved in collecting, transporting sorting and processing metals