Unit 1:1

Question 1

cations

Answer 1

majority are derived from metal atoms.
Positive

Question 2

anions

Answer 2

negative

Question 3

-IDE
-ATE

Answer 3

1. 2 elements
2. 2 elements +oxygen

Question 4

Naming covalent compounds

Answer 4

Mono-
Di-
Tri-
Tetra-
Penta-
Hexa-
Hepta-
Octa-
Nona-
Deca-

Question 5

Oxidation

Answer 5

The addition of oxygen
Removal of hydrogen
Loss of electrons (becoming more positive)

Question 6

Reduction

Answer 6

Removal of oxygen
The addition of hydrogen
Gain of electrons (becoming more negative)

Question 7

REDOX reaction

Answer 7

Reaction in which both oxidation and reduction take place

Question 8

Oxidation number

Answer 8

the number of electrons that needs to be added or taken away in order to become neutral

Question 9

Oxidising agent

Answer 9

when it is reduced

Question 10

Reducing agent

Answer 10

when it is oxidised

Question 11

Oxidation rules

Answer 11

Oxidation number = +2,+3…

1. An uncombined element (H2) has oxidation state -0

In a compound:
2. Cations & Anions (single atoms) have oxidation state equal to the charge.

3. Sum of oxidation states in a compound =0
4. Sum of oxidation states in an ion = the charge of the ion
5. Group 1&2 ions have oxidation state equal to group number
6. Oxygen is -2 except in peroxides/superocides, fluorine
7. The most electronegative atom is given the negative oxidation state.
8. Oxidation states are never higher that the group number