What is corrosion?
Chemical reaction between a metal and the environment which can affect its appearance and strength
Word equation for rust
iron + oxygen + water –> hydrated iron
Scientifc name for rust
Hydrated iron (III) oxide
What type of reaction is rusting?
Oxidation reaction
What 3 ways can be used to prevent rusting?
- Physical barriers
- Galvanisation
- Sacrifical protection
What 3 things can be coated to iron or steel to prevent it rusting?
- Paint
- Oil or grease
- Plastic
Useful properties of copper
- conducts electricity well
- malleable
- conducts heat well
- unreactive
What is an alloy of copper and zinc?
Brass
What are metals reacting with in the environment when they corrode?
- Oxygen
- Water
Examples of metal alloys
- gold
- steel
- aluminium
What are ceramics?
Ceramics are non-metal solids with high melting points that arent made from carbon-based compounds
What type of glass is commonly used in kitchenware and chemical glassware?
Pyrex
2 types of glass ceramics
- soda lime glass
- pyrex
Conditions to produce low density poly(ethene)
- moderate temperatures
- catalyst
- high pressure
Uses of LDPE
- bags
- bottles
How are clay ceramics made?
By shaping a wet clay and then heating in a furnace using a mould
Examples of clay cermaics
- pottery
- bricks
What are composites?
Composites are made of one material embedded in another
Name the raw material that is common to both soda-lime glass and borosillicate glass
Sand (SiO2)
Examples of composites
- wood
- concrete
- fibreglass
What are the 2 materials in composites?
- matrix (binder)
- reinforcement
What is the matrix in concrete?
cement
Uses of HDPE
- water tanks
- drainpipes
What are thermosoftening polymers?
Thermosoftening polymers contain individual polymer chains entwined together with weak forces between these chains.
