Metals
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What are the properties of metals ?
Shiny Malleable Good conductors of heat and electricity
Why is it important we recycle metals ?
They are finite in nature
What is metallic bonding ?
The force of attraction between positively charged ions and delocalised electrons
What is an alloy?
Is a mixture of two or more elements, at least one of which is a metal
What do alloys have in comparison to pure elements ?
Different physical properties and are often more useful that pure metals
What is brass an alloy of ?
70% copper 30% zinc
What is 18 carat gold an alloy of?
75% gold 25% copper/other metals
What is the chemical formula for potassium permanganate ?
KMnO4
What does a metal + oxygen produce ?
Metal oxide
What metals do not readily react with oxygen ?
Mercury Silver Gold
What does a metal + water produce?
Metal hydroxide + hydrogen
Most metals don’t react with water but what do?
Only group 1 and group 2
Why do alkali metals have to be stored under oil?
They react violently with water
What do metal + acid produce?
Salt + hydrogen
What metals do not react with dilute acid?
Copper Mercury Silver Gold
What is oilrig ?
Oxidation is loss Reduction is gain
What metals react with oxygen to form metal oxide ? (11)
Potassium Sodium Lithium Calcium Magnesium Aluminium Zinc Iron Tin Lead Copper
What metals react with water to form metal hydroxide and hydrogen? (5)
Potassium Sodium Lithium Calcium Magnesium
What metals react with acid to form a metal salt and hydrogen ?(10)
Potassium Sodium Lithium Calcium Magnesium Aluminium Zinc Iron Tin Lead
How can less reactive metals (copper, Mercury, silver, gold) be found?
Uncombined in the earths crust
What is the equation for the extraction of unreactive metals by heat alone ?
Metal oxide > metal+oxygen
What type of reaction are the extractions of metals from ores ?
Reduction.
How can slightly more reactive metals be removed from their oxides ?
By heating with carbon or carbon monoxide
Give 2 examples of unreactive metals that can be extracted from their oxide by heating alone ?
Mercury and silver