Chemical changes Flashcards
What forms metal oxides?
Metal+oxygen
What is the type of reaction because the metals gain oxygens?
Oxidation
OIL RIG
Oxidation is loss of electrons, Reduction is gain of electrons
What happens when metals react with other substances?
Metal atoms form positive ions
What is the order of reactivity?
Potassium, Sodium, Lithium, Calcium, Magnesium, Zinc, Iron, Copper
Potassium’s reaction with water
Violent
Sodium reaction with water
Very wuick
Lithium reaction with water
Quick
Calcium reaction with water?
More slow
Calcium reaction with dilute acid
very wuick
Magnesium reaction with dilute acid
quick
Zinc reaction with dilute acid
Fairly slow
Iron reaction with dilute acid
More slow
Copper reaction with dilute acid
Very slow
what can a more reactive metal do to a less reactive metal?
Displace it from a compound
Where is gold found
In the earth
What are most metal found as?
compounds that require chemical reactions to extract the metals
How are metals less reactive that carbon extracted
By reduction with carbon
What do acids and metals react to form?
Salt and hydrogen
What are reactions between acids and metals called
Redox reactions
What are acids neutralised by and what does it form?
Alkalis and bases to form salts and water
what are acids neutralised by to produce salts water and carob dioxide
Metal carbonates
How are soluble salts made?
Reacting acids with a solid insoluble substance( metals, metal oxides, hydroxides, carbonates
Why is the ionic equation of a neutralisation reaction?
H+ + OH- -> H2O
What is a strong acid?
Completely ionised in aqueous solution
What is a weak acid?
Partially ionised in aqueous solution
