Ch 4: Redox Reactions

Question 1

conjugate redox pair

Answer 1

an oxidising agent and its corresponding reducing agent e.g Cu2+/Cu

Question 2

oxidant/oxidising agent

Answer 2

a chemical series which accepts one or more electrons in redox reaction. an oxidant causes another substance to be oxidised, and in the process the oxidant is reduced.

Question 3

oxidation

Answer 3

1. a reaction in which oxygen is a reactant. the addition of oxygen to find oxides, such as combustion reactions.
2. process by which a chemical series loses electrons. electrons on right of equation. an increase in elements oxidation number during the reaction

Question 4

oxidation number

Answer 4

a number assigned to an atom in a compound or as a free element, which represents the charge that the atom would have if it was an ion. oxidation rules are used to determine oxidation numbers. used to identify a redox reaction.

Question 5

oxidised

Answer 5

the loss of electrons or an increase in oxidation number. electrons written on right of equation.

Question 6

redox reaction

Answer 6

electron transfers from the reducing agent to the oxidising agent. the oxidation number of one reactant will increase and the other oxidation number of the reactant will decrease

Question 7

reduced

Answer 7

gain of electrons or a decrease in oxidation number. when a substance is reduced, electrons are on the left of the equation

Question 8

reducing agent

Answer 8

a reaction which causes a reactant to gain electrons or for its oxidation number to decrease. itself is oxidised and loses electrons for its oxidation number to increase

Question 9

reductant/reducing agent

Answer 9

a reactant which causes another reactant to be reduced, it iself is oxidised.

Question 10

reduction

Answer 10

the process whereby a species gains electrons or decreases in oxidation number. electrons on left of arrow.