Chemical Changes Flashcards
What is H₂SO₄?
Sulphuric acid
What is HCl?
Hydrochloric acid
What is HNO₃?
Nitric acid
What colour does methyl orange turn when in an acid?
Red
What colour does methyl orange turn when in an alkali?
Yellow
What colour does phenolphthalein turn when in an acid?
Colourless
What colour does phenolphthalein turn when in an alkali?
Pink
What happens if a solution has more hydrogen ions ?
It is more acidic; has a lower pH
Solute
a substance that dissolves in a liquid
Solvent
the liquid that the solute dissolves in
Solution
formed when a solute dissolves in a solvent
metal + acid ——>
salt + hydrogen
metal oxide + acid —–>
salt + water
metal hydroxide + acid —->
salt + water
metal carbonate + acid ——>
salt + water + carbon dioxide
Test for hydrogen gas
Lit splint; squeaky pop is produced if gas is present
Test for carbon dioxide
Limewater; will turn cloudy/milky
Test for oxygen
Glowing splint; splint will relight
Test for chlorine gas
Damp blue litmus paper; turn red then bleach
What is a pH meter?
a device that can indicate pH
