2.4 Acids and Redox

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

What do all acids contain ?

Back (Answer)

Contain H+ ions, which are released when dissolved.

Front (Question)

What do all alkali’s contain ?

Back (Answer)

Contain OH- ions, which are released when dissolved.

Front (Question)

What is a strong acid ?

Back (Answer)

Fully dissociates all of the H+ ions in a solution. E.g. Hydrochloric acid (HCl)

Front (Question)

What is a weak acid ?

Back (Answer)

Partially dissociates, so only releases a few H+ ions in. solution. E.g. Ethnic acid (CH3COOH)

Front (Question)

What does a metal base produce when reacting with an acid ?

Back (Answer)

Metal + acid = salt + hydrogen

Front (Question)

What does a metal oxide/hydroxide produce when reacting with an acid ?

Back (Answer)

Metal oxide/hydroxide + acid = salt + water

Front (Question)

What does a metal carbonate produce when reacting with an acid ?

Back (Answer)

Metal carbonate + acid = salt + water + carbon dioxide

Front (Question)

What does an alkali produce when reacting with an acid ?

Back (Answer)

Alkali +acid = salt + water

Front (Question)

What is a neutralisation reaction ?

Back (Answer)

When an acid and a base react to form a salt and water. The H+ ions are replaced with metal or ammonium ions.

#10

Front (Question)

Example of neutralisation reaction

Back (Answer)

HCl + NaOH = NaCl + H20

#11

Front (Question)

Ionic equation for neutralisation reaction

Back (Answer)

H+ + OH- = H20

#12

Front (Question)

What is oxidation ?

Back (Answer)

Oxidation is the loss of electrons /gain on oxygen.

#13

Front (Question)

What is reduction ?

Back (Answer)

Reduction is gain of electrons / loss of oxygen.

#14

Front (Question)

Oxidation number rule 1: in terms of atoms

Back (Answer)

An atom in an element has an oxidation number of 0. (Na = 0)

#15

Front (Question)

Oxidation number rule 2: in terms of simple ions.

Back (Answer)

In all simple ions, the oxidation number is always the charge of the ion. (Cl- = -1)

#16

Front (Question)

Oxidation number rule 3: in terms of compounds

Back (Answer)

In a compound, the sum of the oxidation numbers is 0. (MgO=0)

#17

Front (Question)

Oxidation number rule 4: in terms of fluorine

Back (Answer)

Fluorine in a compound has an oxidation number of -1. (KF= -1)

#18

Front (Question)

Oxidation number rule 5: in terms of hydrogen

Back (Answer)

Hydrogen in a compound has an oxidation number of +1 unless it is in a metal hydride, where it is -1.

#19

Front (Question)

Oxidation number rule 6: in terms of oxygen

Back (Answer)

Oxygen in a compound has an oxidation number of -2, unless it is bonded to fluorine or in a peroxide. (F20, H2O2)

#20

Front (Question)

Oxidation number rule 7: in terms of charge of ions in a compound

Back (Answer)

The sum of the oxidation numbers in a compound ion equals the charge of the ion. (CO3 2- = -2)

#21

Front (Question)

Oxidation number rule: roman numerals

Back (Answer)

Roman numerals indicate the oxidation number of the element but no sign is displayed. (Cu (II)SO4)

#22

Front (Question)

How to work out percentage error ?

Back (Answer)

Error/ Amount x 100 Need to multiply by 2 is there is two measurements.

#23

Front (Question)

What is a redox reaction ?

Back (Answer)

Redox reactions involve reduction and oxidation together. If one happens so does the other.

#24

Front (Question)

What is a titration reaction used for ?

Back (Answer)

Used to measure volume of one solution that reacts with exactly with another solution. Used to find the concentration of a solution, identify unknown chemicals and find the purity of a substance.