Topic 3 - Chemical Changes Flashcards
1
Q
Acids in solution contains:
A
- Sources of H+ ions
2
Q
Alkali in solution contains:
A
- Sources of OH- ions
3
Q
Effects of acid and alkalis on:
- Litmus
A
Acid:
- Blue litmus turns red
Alkali:
- Red litmus turns blue
4
Q
Effects of acid and alkalis on:
- Methyl Orange
A
Acid:
- Turns red
Alkali:
- Remains orange
5
Q
Effects of acid and alkalis on:
- Phenolphthalein
A
Acid:
- Remains colourless
Alkali:
- Turns pink
6
Q
Core Practical: Investigate the change in pH
A
- Measure dilute HCl into a conical flask using a pipette
- Add calcium oxide or calcium hydroxide and swirl until reaction completion
- Record solution pH
- For litmus paper, use a glass rod to extract a sample
- Repeat with varying spatula amounts (1-10) of solid and consistent HCl volume.
7
Q
Dilute
A
- Small amount of substance relative to volume of solvent
8
Q
Concentrated
A
- Large amount of substance relative to volume of solvent
9
Q
Weak acid
A
- Partial dissociation into ions in solution
10
Q
Strong acid
A
- Full dissociation into ions in solution
10
Q
Base
A
- Reacts with an acid to form a salt and water only
11
Q
Acid + Metal→
A
- Salt + Hydrogen gas
12
Q
Acid + Metal Oxide→
A
- Salt + Water
13
Q
Acid + Metal Hydroxide→
A
- Salt + Water
14
Q
Acid + Metal Carbonate→
A
- Salt + Carbon Dioxide gas + Water
