Metals And Non Metals Flashcards
What are the exceptions of these properties
The alkali metals (group 1) Because: Their soft Have low melting points Low densities
Also Mercury as it is a liquid at room temperature which is unusual for a metal
Metals and symbols
Copper CU zinc ZN aluminium AL Iron FE Silver AG gold AU
Properties of metals
Electrical conductors Heat conductors Shiny Sonorous Ductile Malleable High melting points Hard and dense
What are the non metal properties
Low melting points
Brittle
Poor heat conductors
Poor electrical conductors
Non metals exceptions
Carbon, in the form of graphite, is a good electric producer
Carbon i the form of diamond Is very hardened has a high melting point
What is an alloy
An alloy is a mixture of metals
Metals are heated till molten and mixed together
They have different properties to when they were metals alone
What are 3 example of alloys(name + what their made up of+ use of this alloy)
Brass - composition : copper+ zinc use: musical instruments
Bronze - composition : tin+ copper use: statues
Stainless steal - composition : iron+ chromium + nickel use: knifes
What is corrosion
Corrosion is an undesirable process where by a metal changes to its oxide or some other compound by combing with oxygen from air
Eg gold and silver do not corrode copper be ones coated with a green coloured substance on exposure to air
What is rusting
Rusting is the corrosion of IRON
FORMS ON THE Surface of iron (or steel) when exposed to air or wate r
It turns into hydrated iron oxide which is a SOFT CRUMBLY BROWN substance which flakes off leaving the next layer of iron to rust
How to prevent rusting
Greasing
Painting
Give metal a shock ie.passing a small electrical current through
Galvanising
Coating with a material that prevent oxygen and water from getting to the metal
What is the activity series
This series describes the rate at which metals react with substances like water and acid
Some metals are more reactive
The series shows that the most reactive metals will be at the top of the series and the least reactive will be at the bottom of the series
What is the activiypty series
CATS MAKE ZEBRAS CRY CALCIUM ca MAGNESSIUM mg ZINC zn COPPER cu
