5 - Chemical changes Flashcards
1
Q
Metal (oxide & hydroxide) + acid = ?
A
Salt + hydrogen
2
Q
Acid + carbonate = ?
A
Salt + water + carbon dioxide
3
Q
Reactive (alkali) metal + acid = ?
A
Salt + hydrogen (gas), leaving an alkaline solution
4
Q
How do we extract metals from ores?
A
Ores are rocks that we extract metals from. The metals are usually chemically bonded to other elements, most commonly oxides. Metals must be reduced to remove the oxygen.
5
Q
Which metals are extracted by electrolysis?
A
Metals that cannot be displaced by carbon as they are more reactive than it.
6
Q
What is a salt?
A
A compound formed when hydrogen in an acid is replaced by metal ions
7
Q
What are bases?
A
Compounds that can neutralise acids.
8
Q
What are some examples of strong acids?
A
- Hydrochloric
- Nitric
- Sulfuric
9
Q
What are some examples of weak acids?
A
- Carboxylic
- Citric
- Carbonic
