Chapter 4 - Acids & Redox Flashcards
(8 cards)
1
Q
What are redox reactions?
A
When one substance is oxidised and another is reduced
2
Q
What is reduction and oxidation in terms of oxidation numbers?
A
Reduction = decrease in oxidation number
Oxidation = increase in oxidation number
3
Q
What reaction is always a redox reaction?
A
ACID + METAL -> SALT + HYDROGEN
4
Q
What is a disproportionation reaction?
A
Specific type of redox reaction where species are simultaneously reduced and oxidised to form two different products
5
Q
What side is the e- in a half equation?
A
LOSS of electrons = right side
GAIN of electrons = left side
6
Q
How do you work out harder half equations?
A
- Work out the change in oxidation number for the element that is not oxygen or hydrogen
- Balance that element and add electrons
- Add water molecules to balance the oxygen
- Add hydrogen ions to balance the hydrogen
7
Q
How do you calculate percentage uncertainty?
A
(Uncertainty/volume measured) x 100
8
Q
What is an alkali?
A
Releases OH- ions in an aqueous solution
