3.1.1 - chemicals and observations Flashcards
formula for water
H2O
formula for ammonia
NH3
formula for hydrochloric acid
HCl
formula for nitric acid
HNO3
formula for sulphuric acid
H2SO4
formula for methane
CH4
formula for sodium hydroxide
NaOH
formula for potassium hydroxide
KOH
formula for ammonium hydroxide
NH4OH
formula for carbon dioxide
CO2
formula for carbon monoxide
CO
formula for sulphur dioxide
SO2
what are the diatomic elements
- bromine
- oxygen
- chlorine
- iodine
- hydrogen
- nitrogen
- fluorine
what pH is acid when using universal indicator and what colours could it be?
1 - 6
weak acid (3-6) - YELLOW
strong acid (1-3) - RED
what pH is neutral when using universal indicator and what colour would it be?
7
would be GREEN
what pH is alkali when using universal indicator and what colours could it be?
8 - 14
weak alkali (8-11) - LIGHT BLUE
strong alkali (11-14) - DARK BLUE/PURPLE
what colour would methyl orange turn in an acid?
red
what colour would methyl orange turn in a neutral substance?
yellow
what colour would methyl orange turn in an alkali?
yellow
what colour would phenolphthalein turn in an acid?
colourless
what colour would phenolphthalein turn in a neutral substance?
colourless
what colour would phenolphthalein turn in an alkali?
pink
what would happen if you added an acid to an alkali in methyl orange?
yellow -> orange
what would happen if you added an alkali to an acid in methyl orange?
red -> orange
what would happen if you added an acid to an alkali in phenolphthalein ?
pink -> colourless
what would happen if you added an alkali to an acid in phenolphthalein ?
colourless -> pale pink
what colour would red litmus turn in an acid?
red
what colour would red litmus turn in a neutral solution?
stays red
what colour would red litmus turn in an alkali?
blue
what colour would blue litmus turn in an acid?
red
what colour would blue litmus turn in a neutral substance?
stays blue
what colour would blue litmus turn in an alkali?
blue
