Topic 5 (lots of questions)
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Examples of transition metals
Iron, copper, nickel, silver, and gold
Typical properties of transition metals
Malleability, high melting point, good conductor of electricity and heat ,hard,strong,shiny
Which transition metal is liquid at room temperature?
Mercury
Transition metals have high
densities
What is a catalyst
substance that speeds up the rate of a chemical reaction without being changed or used up
Catalyst in haber process
iron to make ammonia
Catalyst in contact process
Vanadium(V) oxide to make sulfuric acid
Transition metals make great
Catalysts
compounds of transition metals are…
colourful. The colour they are depends on the ions they contain
Pure metals are
Malleable due to the regular arrangement so layers can slide over each other. They aren’t useful so some used due to this
What is an alloy
mixture of metals or with a non metal
Why are alloys harder than pure metals?
the different sized atoms of the metals distort the layers in the structure, making it more difficult for them to slide over each other
Steel is…than iron
Harder and stronger as long as carbon is less than 1%
Properties of low carbon steel
easily shaped
Properties of high carbon steel
strong but brittle
Properties of stainless steel
Resistant to corrosion
On its own iron will
Rust/corrode quickly so adding steel helps
Bronze
copper and tin
Brass
copper and zinc
Gold alloys
combining gold with other metals creates the hardness required for an indirect restoration
Aluminium alloys
Used in aircraft as it has the low density of aluminium but is stronger.
Magnalium
aluminium and magnesium
What is a redox reaction?
an oxidation reaction paired with a reduction reaction
Metals can corrode in the presence of
Oxygen and water to form their metal oxides