3.4 - Atmosphere and Acids Flashcards
1
Q
Methyl Orange acidic colour
A
Red
2
Q
Methyl Orange neutral colour
A
yellow
3
Q
Methyl Orange alkaline colour
A
Yellow
4
Q
Phenolphthalein acidic colour
A
colourless
5
Q
Phenolphthalein neutral colour
A
colourless
6
Q
Phenolphthalein alkaline colour
A
Pink
7
Q
Red Litmus acidic colour
A
red
8
Q
Red Litmus neutral colour
A
red
9
Q
Red Litmus alkaline colour
A
blue
10
Q
Blue Litmus acidic colour
A
red
11
Q
Blue Litmus neutral colour
A
blue
12
Q
Blue Litmus alkaline colour
A
blue
13
Q
pH 0-2 colour
A
red
14
Q
pH 3-4 colour
A
orange
15
Q
pH 5-6 colour
A
yellow
16
Q
pH 7 colour
A
green
17
Q
pH 8-10 colour
A
light blue
18
Q
pH 11-13 colour
A
dark blue
19
Q
pH 14 colour
A
purple
20
Q
Percentage of nitrogen in air
A
78
21
Q
Percentage of oxygen in air
A
21
22
Q
Percentage of argon in air
A
0.96
23
Q
Percentage of carbon dioxide in air
A
0.04
24
Q
Equation for the percentage of oxygen in the air?
A
% O2 = initial vol - final vol / 100 x100
25
Reasons that % of O2 wasn't 21
- metal not heated for long enough
- leaky apparatus
26
What is element combustion
Element combustion is when an element reacts with oxygen to produce an oxide.
Element + Oxygen → Element oxide
26
What does a metal reacted with oxygen produce?
metal oxide
26
What does a non-metal reacted with oxygen produce?
non-metal dioxide
27
What are the three important combustions
1) 2Mg(s) + O2(g) → 2MgO(s)
2) S(s) + O2(g) → SO2(g)
3) 2H2(g) + O2(g) → 2H2O(l)
28
Observation of the reaction between magnesium and oxygen?
- bright white light
- white powder formed
29
Observation of the reaction between sulfur and oxygen?
blue flame
30
Observation of the reaction between hydrogen and oxygen?
squeaky pop
31
Charge on iron (II)
2+
32
Charge on iron (III)
3+
33
Charge on copper
2+
34
Charge on silver
1+
35
Charge on zinc
2+
36
Charge on lead
2+
37
What type of solution do metal oxides form?
Alkaline
38
What type of solution do non- metal dioxides form?
acidic
39
What steps could you take to find out whether an element was a metal or non-metal?
1. Combust it in oxygen
2. Dissolve the oxide formed
3. Check the pH of the solution with an indicator
40
Definition of an acid
H+ donor
41
Definition of an alkali
OH- donor
42
Definition of a base
H+ acceptor
43
What do have to do when multiplying polyatomic ions in chemical formulae?
USE BRACKETS
44
acid + base equation
Acid + Base → Salt + Water
45
Observation from an acid and base reaction?
The base disappears
46
acid + carbonate equation
Acid + Carbonate → Salt + Water + Carbon dioxide
47
Observations from acid and carbonate reaction?
- the carbonate disappears
- there is fizzing
