Chapter 4, Acids And Redox

Question 1

Define an acid

Answer 1

A proton donor

Question 2

Define a strong acid

Answer 2

Liquid that fully dissociated/ionises in water

Question 3

Define a weak acid

Answer 3

Liquid that partially dissociates/ionises in water

Question 4

Define a base

Answer 4

A proton acceptor

Question 5

What is an alkali?

Answer 5

A soluble base that produces OH‐ ions

Question 6

How is a salt formed?

Answer 6

When some ot all H+ ions are eeplaced by metal ions or ammonium ions

Question 7

What is reduction?

Answer 7

Gaining of electrons
Loss of oxygen
Decrease in oxidation number
Addition of hydrogen

Question 8

What is oxidation?

Answer 8

Losing of electrons
Gaining of oxygen
Increase in oxidation number
Loss of hydrogen

Question 9

What are the rules for oxidation number?

Answer 9

Uncombined elements 0
Group 1, +1
Group 2, +2
Hydrogen +1 with Group 1 it’s -1
Oxygen -2 with peroxide -1 with flourine +2

Question 10

What is the oxidation number for NaCl?

Answer 10

+1, -1

Question 11

What is disproportionation?

Answer 11

When the same element is both oxidised and reduced in the same reaction

Question 12

What element has been oxidised and reduced?

2KBr + F > Br + 2KF
2 2

Answer 12

Br has been oxidised
F has been reduced

Question 13

Describe how to prepare a standard solution

Answer 13

Accurately weigh out the amount of substance using a 2dp balance.
Completely dissolve the solute in distilled water.
Move contents from beaker to volumetric flask add rinsing to flask.
Use dropping pipette to add water to flask until it reaches the graduation line