Topic 4 Higher Flashcards
(11 cards)
1
Q
When is electrolysis uses to extract metals?
A
- when the metal is more reactive than carbon
2
Q
Describe how to conduct a titration.
A
- measure 25 cm^3 of the acid using a pipette and add to a conical flask
- fill the burette with the alkali and record the starting volume
- add an indicator to the conical flask
- slowly add the alkali to the acid until a color change occurs
- swirl while you add the alkali
- repeat and calculate a mean
3
Q
What is a strong acid?
A
An acid that completely ionizes in water
4
Q
Why does a stronger acid have a higher ph than a weaker acid?
A
- the stronger acid ionizes completely
- the weak acid only partially ionizes
- meaning there is a higher concentration of H+ ions in the solution of the strong acid
5
Q
What is oxidation?
A
The loss of electrons
6
Q
What is reduction ?
A
The gain of electrons
7
Q
How can you produce a soluble salt?
A
By reacting an acid with an insoluble salt
8
Q
What are some examples of insoluble salts?
A
- metal oxides
- metal hydroxides
- carbonates
9
Q
Explain the process to produce a soluble salt from an insoluble salt.
A
- add an acid to the insoluble salt
- add the insoluble salt in excess to ensure all the acid reacts
- filter off the excess insoluble salt
- conduct crystallization to form crystals of the soluble salt
10
Q
When is oxygen produced at the positive electrode?
A
- when the ionic solution does not contain a halide ion
11
Q
When is hydrogen produced at the negative electrode?
A
When the.metal in the solution is more reactive than hydrogen
