Unit 3 Flashcards
1
Q
acid
A
- pH less than 7
- forms H+ ions in water
- higher concentration of hydrogen ions, more acidic
2
Q
base
A
- reacts with an acid to produce salt and water
- alkali is a base that is soluble in water
- forms OH- ions in water
3
Q
litmus
A
- red in acid
- blue in alkaline
4
Q
methyl orange
A
- red in acid
- yellow in others
5
Q
phenolpthyalein
A
- colourless in acid
- pink in alkaline
6
Q
acid + metal oxide
A
salt + water
7
Q
acid + metal
A
salt + hydrogen
8
Q
acid + metal carbonae
A
salt + water + carbon dioxide
9
Q
electrolysis
A
electric current is passed through an electrolyte ( dissolved ionic compound )
10
Q
cations
A
- positive
- attract to negative cathode
- gain electrons (reduction)
11
Q
anions
A
- negative
- attracted to positive anode
- lose electrons (oxidation)
12
Q
electrolysis in salt solution
A
consider ions in water
13
Q
at the cathode
A
hydrogen gas produced if the metal is more reactive than hydrogen
14
Q
uses of chlorine
A
- bleach
- plastics
- kill bacteria
15
Q
uses of hydrogen
A
- margarine
- fertilisers
- fuel
