chemical changes Flashcards
metal oxide
a compound formed when a metal ionically bonds with oxygen
reactivity series
the order of elements in terms of their reactivity
acid
a substance that released H+ ions and has a pH below 7
base
a substance that neutralises an acid having a pH above 7
alkali
a type of soluble base. a metal hydroxide. Releases OH- ions
neutralisation
when an acid reacts with a base to produce a salt and water
carbonates
Ionic compounds containing carbon and oxygen
salt
ionic compound formed when acid and base reacts
soluble
a substance that dissolves
insoluble
a substance that doesn’t dissolve
indicator
a substance that changes colour when pH changes
electrolysis
splitting up an ionic substance using electricity
molten
turned into a liquid
solution
dissolves in water
suitable indicators for titrations
methyl orange ~ acid: red, alkali: yellow
litimus ~ acid : red, alkali : purple
why shouldn’t we use universal indicators for titrations?
universal indicators change from colour to colour (a mixture of colours) when doing titrations we want a sudden colour change
what do metal and oxygen make?
metal + oxygen —> metal oxide
what do metal and water make?
metal + water —> metal hydroxide + hydrogen
what metal and acid make?
metal + acid —> salt + hydrogen
what does metal carbonate + acid make?
metal carbonate + acid —> salt + water + carbon dioxide
what does a metal oxide and acid make?
metal oxide + acid —> salt + water
test for chlorine
chlorine bleaches damp litmus paper, turning it white
hydrogen test
squeaky pop, with a lighted splint
test for oxygen
oxygen will relight a glowing splint
why does the anode need to be continuously replaced?
oxygen is produced in the anode which is made of carbon
this carbon reacts with the oxygen to produce carbon dioxide
