5.1-5.3 Redox reactions and Oxidation and reduction

Reduction

________ is a reaction in which an element, ion or compound gains electrons.

Copper ions

________ have been reduced as the oxidation state has decreased from +2 in Cu2+ to 0 in Cu and they have gainedelectrons:

Aluminium

________ in a compound usually has the oxidation state +3.

II

Iron can form ions with a 2+ charge, called iron (________) ions or a 3+ charge, called iron (III) ions.

Roman numeral

The ________ is the oxidation state of the element.

Transition elements

________ can bond in different ways by forming ions with different charges.

Oxidation

________ is a reaction in which an element, ion or compound loses electrons.

iron

When ________ reacts with oxygen to form ________ oxide, the formula depends on the oxidation state of the ________ ions.

Gain of electrons

Oxidation is Loss of electrons Reduction is ________.

Reduction

________ is gain of electrons, loss of oxygen.

Oxidation

________ is the loss of electrons, gain of oxygen.