topic 4 - chemical changes Flashcards
1
Q
pH scale
A
0-7-14
red-green-purple
acid-neutral-alkali
2
Q
acid + base
A
salt + water
3
Q
strong acids
A
all acid particles dissociate to release h+ ions
4
Q
weak acids
A
only some dissociate
5
Q
acid + metal oxide
A
salt + water
6
Q
acids + metal hydroxide
A
salt + water
7
Q
acid + metal carbonate
A
salt + water + co2
8
Q
the reactivity series
A
potassium sodium lithium calcium magnesium carbon zinc iron hydrogen copper
9
Q
redox reactions
A
oxidation is the loss of electrons
reduction is the gain of electrons
10
Q
electrolysis
A
current passed though an electrolyte and two elements are split and formed
11
Q
electrolysis in aqueous solutions
A
hydrogen will be produced if the metals is more reactive than hydrogen
if halide ions are present (cl, br, I) they will be formed or else oxygen will be formed
