C15 Using our resources

Question 1

alloy

Answer 1

a mixture of two or more elements, at least one of which is a metal

Question 2

carbon steel

Answer 2

alloy of iron containing controlled, small amounts of carbon

Question 3

galvanised

Answer 3

iron or steel objects that have been protected from rusting by a thin layer of zinc metal at their surface

Question 4

neutralisation

Answer 4

the chemical reaction of an acid with a base in which a salt and water are formed. If the base is a carbonate or hydrogen carbonate, carbon dioxide is also produced in the reaction

Question 5

polymer

Answer 5

a substance made from very large molecules made up of many repeating units

Question 6

rusting

Answer 6

the corrosion of iron

Question 7

sacrificial protection

Answer 7

an effective way to prevent rusting whereby a metal more reactive than iron (such as zinc or magnesium) is attached to or coated on an object

Question 8

stainless steel

Answer 8

a chromium-nickel alloy of steel which does not rust

Question 9

steel

Answer 9

alloys of iron with carbon and/or other elements. The properties of steel depend on the type and amounts of elements added

Question 10

thermosetting polymer

Answer 10

polymer that can form extensive cross-linking between chains, resulting in rigid materials which are heat-resistant

Question 11

thermosoftening polymer

Answer 11

polymer that forms plastics which can be softened by heating, then remoulded into different shapes as they cool down and set