RedOx

Question 1

OIL RIG stands for

Answer 1

Oxidation
Is
Loss
Reduction
Is
Gain

Question 2

rules of oxidation states

Answer 2

1. sum of oxidation numbers in a neutral compound is 0
2. sum of oxidation numbers in an ion is equal to the charge of the ion
3. oxidation number of an uncombined element is 0
4. oxidation number of oxygen is -2 except in peroxides where it’s -1
5. oxidation number of hydrogen is +1 except in hydroxides it’s -1
6. fluorine always -1 so in oxygen diflouride oxygen is -2

Question 3

metals lose/gain electrons to form a … ion by undergoing oxidation

Answer 3

lose
positive

Question 4

non metals lose/gain electrons to form a … ion by undergoing reduction

Answer 4

gain
negative

Question 5

how to work out oxidising reagent

Answer 5

oxidises another species whilst being reduced

Question 6

how to work out reducing reagent

Answer 6

reduces another species whilst being oxidised

Question 7

steps to writing half equation

Answer 7

1. check element we are focusing on is balanced
2. balance oxidation numbers
3. add water to balance the O or H
4. add H+ or OH- to balance charges

Question 8

in reduction which side does electrons go on

Answer 8

Right

Question 9

in oxidation which side does electrons go on

Answer 9

Left

Question 10

steps to combining half equations

Answer 10

1.multiply half equations by a factor so number of electrons in each half equation is the same
2. add equations together then cancel out electrons
(like simultaneous equations)

Question 11

disproportionation reaction

Answer 11

disproportionation reaction is a type of redox reaction where the same element in one substance is both oxidized and reduced at the same time.