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| Question | Answer |
| Melting point | The temperature at which something melts. |
| Monomer | A small molecule that can be joined to make others in long chains to make it a polymer. |
| Branched chain | A chain of carbon atoms with short branches. |
| Polymerise | The joining together of lots of small molecules called monomers to form a long chain molecule called a polymer. |
| Crystalline polymer | A polymer with crystals lined up in a regular way as in a crystal. |
| Crude oil | A dark, oily liquid found in the Earth, which is a mixture of hydrocarbons. |
| Hydrocarbon | A compound of hydrogen and carbon only. Ethane is a hydrocarbon. |
| Fraction | A mixture of hydrocarbons with similar boiling points that have been separated from crude oil by fractional distillation. |
| Fractional distillation | The process of separating crude oil into groups of molecules with similar boiling points called fractions. |
| Chemical synthesis | Making a new chemical by joining together simpler chemicals. |
| Material | The polymers, metals, glasses and ceramics that we use to make all sorts of objects and structures. |
| Properties | The physical and chemical characteristics of a chemical are what make it different from other chemicals. |
| Polymer | A material made of very long molecules formed by joining lots of small molecules called monomers together. |
| Natural | A material that occurs naturally but may need processing to make it useful, such as silk, cotton and leather. |
| Mixture | Two or more different chemicals, mixed but not joined chemically. |
| Synthetic | A material made by a chemical process, not naturally occurring. |
| Tectonic plates | Giant slabs of rock that make up the Earths outer layer. |
| Magnetic | A material that is attracted to a magnet. For example, iron is magnetic. |
| Sedimentary rock | Rock formed from layers of sediment. |
| Grains | A small particle of a substance, for example, grains of sand. |
| Erosion | The movement of solids at the Earths surface cause by wind, water, ice, gravity and living organisms. |
| Evaporation | The change in state from a liquid to a gas. |
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