acids, atmosphere and salts Flashcards
1
Q
acid + carbonate -> ?
A
salt + water + carbon dioxide
2
Q
observations in an acid + carbonate reaction
A
carbonate disappears, fizzing
3
Q
test for carbon dioxide
A
limewater -> turns cloudy
4
Q
acid + base -> ?
A
salt + water
5
Q
observation in an acid + base reaction
A
base disappears
6
Q
how can you obtain pure, dry, salt crystals from a salt solution
A
- heat the solution until crystals start to form
- leave to crystalise
- filter
- pat dry with filter paper
7
Q
define ‘acid’
A
H+ donor
8
Q
define ‘base’
A
H+ accepter
9
Q
formula of ammonia
A
NH3
10
Q
formula of ammonium
A
NH4+
11
Q
percentage of nitrogen in the air
A
78%
12
Q
percentage of oxygen in the air
A
21%
13
Q
percentage of argon in the air
A
0.9%
14
Q
percentage of carbon dioxide in the air
A
0.04%
15
Q
how to measure percentage of oxygen
A
react with another element
-the air gradually decreases in volume until all of the oxygen has been added to the metal
