Metals, acids and salts Flashcards
Metal reaction with acid
Acid + metal —> salt + hydrogen
Some metals reactions with water
Metal + water —> metal hydroxide + hydrogen
Metals that react vigorously with water
Potassium, sodium, lithium, calcium
Metals that react with steam
Magnesium, zinc, iron
Metals that don’t react with water or steam
Copper
Oxidation
Gain of oxygen
Reduction
Loss of oxygen
Oxidation reaction
The substance that OXIDISES the metal and is REDUCED is the OXIDISING agent
Reduction reaction
The substance that REDUCES the metal and is OXIDISED is called the REDUCING agent.
Strongest acid / weak acid pH
0-3/3-6
Neutral pH water
7
Weakly alkali / strongly alkali
8-10 / 11-14
Universal indicator colours
Spectrum
Red in acid
Green in neutral
Purple in alkali
Litmus paper
Red in acid
Purple in neutral
Blue in alkali
Phenolphthalein
Colourless in acid
Bright pink in alkali