Term
| Different ways to group materials |
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Definition
| natural/man-made, metals/non-metals/ solids, liuids and gases |
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Term
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Definition
| cooking pans, building materials, containers |
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Term
| Different uses for copper |
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Definition
| cooking pans, electric wires |
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Term
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Definition
| Stockings, clothes, fibres for carpets |
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Term
| Different uses for polystyrene |
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Definition
| Plastic cups, yogurt pots, ball-point pens |
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Term
| Different materials used for clothes |
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Definition
| cotton, wool, nylon, polyester |
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Term
| Different materials used for cooking vessels |
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Definition
| stainless steel, aluminium, glass, ceramic |
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Term
| Different materials used for doors, window frames, chairs/tables |
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Definition
| Wood, steel, glass, plastic (PVC) |
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Term
| Different materials used for containers/packaging |
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Definition
| Plastic, wood, glass, steel, paper, cardboard |
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Term
| Property: Flammability? Examples |
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Definition
| Ability to catch fire easily, e.g. paper, oil, nylon |
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Term
| Property: Hardness? Examples |
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Definition
| Ability to resist wear, impacts, e.g. concrete, steel |
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Term
| Property: Strength? Examples |
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Definition
| Ability to resist large forces, e.g. concrete, steel |
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Term
| Property: Elastic? Examples |
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Definition
| Ability to return to original shape after being stretched--, e.g. rubber, lycra |
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Term
| Property: Thermal conductivity? Examples |
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Definition
| Ability to let heat flow easily through the material, e.g. copper, all metals |
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Term
| Property: Electrical conductivity? Examples |
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Definition
| Ability to let current flow easily through the material, e.g. copper, all metals |
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Term
| Property: Corrosion resistance? Examples |
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Definition
| For metals: does not react chemically with other substances, e.g. stainless steel, gold |
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Term
| Property: Flexibility? Examples |
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Definition
| Ability to bend without breaking- plastic |
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Term
| Property: Heat resistance? Examples |
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Definition
| Ability to withstand high temperature without damage-ceramic, concrete |
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Term
| Property: Wear resistance? Examples |
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Definition
| Durable, e.g. ceramics, concrete, steel |
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Term
| What is concrete made of? |
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Definition
| Cement and aggregate (sand + pebbles) |
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Term
| How can the properties of concrete be changed? |
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Definition
| By changing the type of aggregate, i.e. finer or larger particles |
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Term
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Definition
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Term
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Definition
| Steel = carbon+iron; Solder= lead and |
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Term
| What is added to steel to make it corrosion resistant (stainless steel) |
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Definition
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Term
| What is added to steel to make it resistant to wear? |
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Definition
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Term
| What is added to steel to make it stronger? |
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Definition
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Term
| What happens when steel is heated up and cooled down quickly (i.e. quenched? |
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Definition
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Term
| How can polystyrene be made a better heat insulator? |
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Definition
| Heat it up so it expands, trapping more air for insulation |
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Term
| How can fibres be made better at insulation? |
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Definition
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Term
| What does the strength of a structure depends on? |
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Definition
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Term
| What shapes make a structure stronger? |
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Definition
| Triangles, T and H shaped girder tubes, corrugation (folded in ridges like cardboard) |
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Term
| How can materials for soft-furnishing and curtains be made less flammable? |
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Definition
| Treat them with flame-proofing chemicals. |
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Term
| What happens to flame-proofed materials when they are washed? |
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Definition
| Flame-proofing material is often washed out. |
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Term
| What toxic fume is produced when carbon-containing material burn? |
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Definition
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Term
| C-What does it do to your body? |
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Definition
| Combines with haemoglobin in red blood cells which stops blood carrying oxygen. |
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Term
| What toxic fume is produced when polyurethane burn? |
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Definition
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Term
| C-What does it do to your body? |
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Definition
| Affects the nervous system |
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Term
| What toxic fume is produced when PVC burns? |
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Definition
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Term
| C-What does it do to your body? |
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Definition
| Burns the lining of the lungs |
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Term
| What can damage materials? |
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Definition
| Weather, corrosion, pests, heat and impact. |
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Term
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Definition
| Gradual breakdown of a metal due to a chemical reaction at its surface. |
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Term
| What can be done to protect wood from the weather? |
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Definition
| Water-proofing (varnishing), painting, packaging. |
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Term
| What can be done to protect metals against corrosion? |
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Definition
| Painting, metal-plating, packaging |
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Term
| What can be done to protect wood from pests? |
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Definition
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Term
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Definition
| Covering a metal with a layer of another metal using electricity |
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Term
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Definition
| Covering steel or iron with a layer of zinc, protects against corrosion |
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Term
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Definition
| Using electricity to thicken the oxide layer on aluminium, protects against corrosion |
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Term
| C- What is the economic consequence of corrosion? |
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Definition
| Cost of replacing corroded parts, loss of production, additional labour costs, cost of protection. |
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