(4) chemical changes Flashcards
what is the name of a reaction between an acid and a base
neutralisation reaction
acid + metal ->
salt + hydrogen
metal + water ->
metal hydroxide + hydrogen
acid + carbonate ->
salt + water + carbon dioxide
acid + metal oxide ->
acid + metal hydroxide ->
salt + water
where is carbon in the reactivity series
in between magnesium and zinc
magnesium
CARBON
zinc
where is hydrogen in the reactivity series
in between iron and copper
iron
HYDROGEN
copper
why is gold mined in its elemental form
it is so unreactive it is found as the metal itself
why can a molten ionic compound be electrolysis but a solid ionic compound cannot
in a solid ionic compound the ions are in fixed positions and cannot move
in a molten ionic compound the ions can move freely and conduct electricity
in aqueous solutions containing H+ ions and metal ions, what is most often formed at the anode
hydrogen
in electrolysis, non metals are attracted to the ________ electrode
positive
because they form negative ions
what is the test for chlorine
it will bleach damp litmus paper white
what is the test for hydrogen
it will make a squeaky pop with a lit splint
what is the test for oxygen
it will relight a glowing splint
when is cryolite used and why
it is used in electrolysis to extract aluminium
it is mixed with aluminium oxide to lower the melting point
