C7 Redox

Question 1

Mineral

Answer 1

A naturally occurring substance of which rocks are made

Question 2

Melt

Answer 2

A solid changes to a liquid at the melting point

Question 3

Ore

Answer 3

A naturally occurring mineral from which a metal can be extracted

Question 4

Oxidation

3 definitions

Answer 4

1) a reaction in which oxygen is added to an element or compound
2) a reaction involving the loss of electrons from an atom, molecule or ion
3) a reaction in which the oxidation number of an element is increased

Oxidation is brought about by an oxidising agent and happens at the anode

Question 5

Reduction

3 definitions

Answer 5

1) a reaction in which oxygen is removed from a compound
2) a reaction involving the gain of electrons by an atom, molecule or ion
3) a reaction in which the oxidation number of an element is decreased

Reduction is brought about by a reducing agent and happens at the cathode

Question 6

Reactivity series

Answer 6

Different metals have different reactivities. The order of the reactivities is called the reactivity series

Question 7

Extraction

Answer 7

Metals are extracted from their ores by a process of reduction. Carbon can be used to do this if the metal is below carbon in the reactivity series

Question 8

Redox reaction

Answer 8

A reaction when reduction and oxidation take place at the same time. They always involve electron transfer

Question 9

Oxidising agents

Answer 9

The chemicals doing the oxidising. They themselves get reduced in the reaction.
E.g oxygen

Question 10

Reducing agents

Answer 10

The chemicals doing the reducing. They themselves will get oxidised in the reaction.
E.g carbon monoxide

Question 11

Metal

Answer 11

An element that is shiny, conducts heat and electricity, can be beaten into thin sheets (malleable) or drawn into wires (ductile) is probably a metal. They usually have high melting and boiling points and high densities. Metals burn in oxygen to form neutral or alkaline oxides