Science - Metals and Materials Flashcards
What are the properties of metals
Lustre (metals shiny when fresh cut)
Malleable (metals can be bent or hammered to new shape)
Ductile (metals can be stretched into thin wires)
Sonorous - metals make a sound when hit
What good conductors do metals have
Heat and electricity
What is the reactivity series for metals
(least reactive)
Potassium
Sodium
Lithium
Calcium
Magnesium
Aluminium
Zinc
Iron
Nickel
Tin
Copper
Silver
Gold
(most reactive)
What is corrosion
When metals are exposed to the environment they can deteriorate or corrode which is called oxidation
Oxidation in metals form ________
Metal Oxides
What is rust
A reddish orange powder of hydrated iron oxide
What does it need for iron to rust
Water and oxygen
The more ________ a metal is the _____ it could rust
reactive, less
What is some protection from rusting
Iron can be coated over by plastic, paint, oil, chrome plating or a layer of zinc (galvanization) for iron to rust less.
What is word equation for reactions of metals with acid
Metal + acid (arrow) Metal salt + hydrogen gas
What is word equation for reaction of metals with oxygen
metal + oxygen (arrow) metal oxide
Count to 10 in organic
Methane
Ethane
Propane
Butane
Pentane
Hexane
Heptane
Octane
Nonane
Decane
What are hydrocarbons
a molecule made completely of nly carbon and hydrogen atoms
What are organic compounds
Where all compounds are made up of 1 or more carbon atoms7
What are polymers
Large molecules made of many repeating units called monomers
What do different repeating monomers create
Different polymers and different plastics
What are thermosetting polymers
Plastics that arent affected by heat once they have been formed which makes these plastics difficult to recycle
What is thermoplastic polymers
Plastics that become soft or mouldable when heated and the process of heating can be repeated continuously which makes it easy to recycle.
What is polyvinylchloride used for
made from vinyl chloride monomer and used for car seats and wire insulation
What is polythene used for
high density polythene for containers and low density polythene for insulation
What is polystyrene used for
used for food containers, disposable cutlery, foam packaging
What is polycarbonate’s qualities
Tough, transparent and heat resistant
What is polypropylene used for
used for kayaks, bottles and clothes
What is polyester used for
used for fabrics, rope and moulded parts
What is nylon used for
In fibre form it is used for clothing and rope.
