Ph and indicators Flashcards
Colour of Methyl orange in Acid, Neutral, Alkali
Red, yellow, yellow
Colour of Phenolphthalein in Acid, Neutral, Alkali
Colourless, colourless, pink
Colour of Red litmus in Acid, Neutral, Alkali
Red red blue
Colour of Blue Litmus in Acid, Neutral, Alkali
Red blue blue
How do you know that two solutions with different pHs would give a neutral solution
If the pHs are equidistant from pH7
Eg. pH2 and pH12
4 most abundant gases in air
Nitrogen - 78%
Oxygen - 21%
Argon - 0.96%
Carbon Dioxide - 0.04%
During combustion metals form
metal oxides
During combustion common non-metals form
non-metal dioxides
What can you observe when Magnesium reacts with oxygen
Bright white light with a white powder formed
what pH are non-metals
acidic
What can you observe when sulphur reacts with oxygen
blue flame
What is an acid
H+ ion or proton donor
What is an alkali
OH- ion donor
Common bases
All metal oxides and hydroxides
Ammonium oxides and hydroxides
Formula for Hydrochloric acid
HCl -
Formula for Sulfuric acid
H2SO4 2-
Formula for Nitric acid
HNO3 -
Formula for Phosphuric Acid
H3PO4 3-
What pH do all salts have
neutral
Formula for Hydrobromic acid
HBr -
Acid and metal general equation
Acid + metal -> salt + hydrogen
Acid + alkali (or base) general equation
Acid + alkali -> Salt + water
How are bases and alkalis different
Alkalis are soluble bases
Acid + carbonates general equation
Acid + carbonate -> salt + water + carbon dioxide
What is metallic bonding
the electrostatic force of attraction between positive metal ions and a delocalised sea of electrons
What is ionic bonding
the electrostatic force of oppositely charged ions
What is the Giant Metallic Structure like
Positive ions in formation
For a group one metal: same number of electrons than ions
for a group three metal: three times the number of electrons than ions
