Higher Only
Lemon juice can be described as a weak acid.
What is the pH value for a weak acid?
pH 1
pH 4
pH 7
pH 14
Did this page help you?
Lemon juice can be described as a weak acid.
What is the pH value for a weak acid?
pH 1
pH 4
pH 7
pH 14
Did this page help you?
What is the name of the gas made when zinc carbonate reacts with hydrochloric acid?
Carbon dioxide
Chlorine
Hydrogen
Oxygen
Did this page help you?
Which of these pH values shows the pH of a strong acid?
1
5
7
10
Did this page help you?
What is the name of the gas made when magnesium reacts with sulfuric acid?
Carbon dioxide
Carbon monoxide
Hydrogen
Oxygen
Did this page help you?
Calcium reacts with hydrochloric acid to form the salt, calcium chloride and another product.
calcium + hydrochloric acid → calcium chloride + ___________
What is the unknown product?
Water
Oxygen
Hydrogen
Carbon dioxide
Did this page help you?
A solution of hydrochloric acid is pH 2. The acid solution is diluted, and the pH is now 3.
By what factor is the acid solution diluted?
5
10
100
1000
Did this page help you?
Which diagram represents a strong, dilute acid?
Did this page help you?
A student added some sulfuric acid gradually to a solution of ammonia until it was in excess.
What happens to the pH during this reaction?
pH of ammonia at start | pH after addition of excess sulfuric acid | |
A | 11 | 7 |
B | 7 | 13 |
C | 11 | 2 |
D | 3 | 8 |
Did this page help you?
What is the ionic equation for neutralisation?
2H+ (aq) + OH- (aq) → H2O (l)
H+ (aq) + OH- (aq) → H2O (aq)
H+ (aq) + OH- (aq) → H2O (l)
2H2 + O2 → 2H2O
Did this page help you?
Zinc is extracted from zinc oxide by reduction.
zinc oxide + carbon → zinc + carbon dioxide
Which element acts a reducing agent during this process?
Hydrogen
Oxygen
Carbon
Zinc
Did this page help you?
Which statement correctly describes a strong acid?
Fully ionise in solution and have a high concentration of H+ ions
Fully ionise in solution and have a low concentration of H+ ions
Partially ionise in solution and have a high concentration of H+ ions
Partially ionise in solution and have a low concentration of H+ ions
Did this page help you?
Sodium hydroxide reacts with sulfuric acid.
__NaOH + __H2SO4 → __Na2SO4 + __H2O
Which numbers correctly balance the equation?
1, 2, 2, 1
2, 2, 1, 2
2, 1, 1, 2
1, 1, 2, 2
Did this page help you?
Sodium hydroxide reacts with hydrochloric acid. Sodium chloride and water are made.
What is the name of this type of reaction?
Neutralisation
Oxidation
Reduction
Thermal decomposition
Did this page help you?
Neutralisation occurs when acids react with alkalis.
What is the ionic equation for neutralisation?
H+ + OH− → H2O
H- + OH+ → H2O
H+ + OH+ → H2O
H- + OH− → H2O
Did this page help you?
Look at the equation.
CH4 + 2O2 → CO2 + 2H2O
Which substance is oxidised in this reaction?
CH4
CO2
H2O
O2
Did this page help you?
Look at the equation.
CH4 + 2O2 → CO2 + 2H2O
Which substance is the oxidising agent in this reaction?
CH4
CO2
H2O
O2
Did this page help you?
A student measures the pH of an acid and an alkali.
He adds magnesium metal to the acid and to the alkali.
What results should he expect?
Acid | Alkali | |||
pH | Reaction with magnesium | pH | Reaction with magnesium | |
A | Below 7 | No reaction | Above 7 | Magnesium fizzes |
B | Below 7 | Magnesium fizzes | Above 7 | No reaction |
C | Above 7 | Magnesium fizzes | Above 7 | No reaction |
D | Above 7 | No reaction | Above 7 | Magnesium fizzes |
Did this page help you?
Which equation represents neutralisation?
2H+ → H2
H2O → H+ + OH-
H+ + OH- → H2O
2OH- → O2 + H2
Did this page help you?
Magnesium reacts with copper oxide.
Magnesium oxide and copper are made.
magnesium + copper oxide → magnesium oxide + copper
Which substance is the reducing agent?
Copper
Copper oxide
Magnesium
Magnesium oxide
Did this page help you?
Which is the best explanation of a concentrated acid?
The acid is completely ionised in solution in water.
The acid is partially ionised in solution in water.
There is a large amount of acid and a small amount of water.
There is a large amount of water and a small amount of acid.
Did this page help you?
Magnesium powder reacts with copper(II) oxide. Magnesium oxide and copper are made.
Mg + CuO → MgO + Cu
Which substance is the reducing agent?
Magnesium
Copper oxide
Magnesium oxide
Copper
Did this page help you?
The equation shows a reaction that involves both oxidation and reduction.
Fe2O3 + 2Al → Al2O3 + 2Fe
Which statement about reduction is correct?
The gain of oxygen and the gain of electrons by a substance
The gain of oxygen and the loss of electrons by a substance
The loss of oxygen and the gain of electrons by a substance
The loss of oxygen and the loss of electrons by a substance
Did this page help you?
What is the best explanation of what is meant by a strong acid?
There is a large amount of acid and a small amount of water.
There is a small amount of acid and a large amount of water.
The acid is completely ionised in solution in water.
The acid is partially ionised in solution in water.
Did this page help you?
Which equation represents neutralisation?
4H+ → 2H2
H2O → 2H+ + O2–
H+ + OH– → H2O
O2 + H2 → H2O + O2–
Did this page help you?
A solution of sulfuric acid with a pH of 4 has a hydrogen ion concentration of 1 x 10-4 mol/dm3.
Another acid has a hydrogen ion concentration of 1 x 10-6 mol/dm3.
What is the pH of this acid?
2
3
5
6
Did this page help you?
A reaction took place between iron sulfate and magnesium.
iron(II) sulfate + magnesium → magnesium sulfate + iron
Which species has been oxidised?
Iron
Magnesium
Sulfur
None of the above
Did this page help you?
A displacement reaction occurs between zinc and copper chloride.
Which half equation correctly shows the change that zinc undergoes?
Zn2+(aq) + 2e- → Zn (s)
Zn (s) + 2e- → Zn2+ (aq)
Zn2+ (aq) → Zn (s) + 2e-
Zn (s) → Zn2+ (aq) + 2e-
Did this page help you?
A student investigates some acids.
She has a solution of hydrochloric acid of concentration 0.01 mol / dm3.
This solution has a pH of 2.
She increases the concentration of hydrochloric acid from 0.01 mol / dm3 to 0.1 mol / dm3.
What is the pH of this new solution?
0
1
3
12
Did this page help you?
Which statement about an oxidising agent is correct?
It gains oxygen in a reaction.
It is oxidised in a reaction.
It is reduced in a reaction.
It loses electrons in a reaction.
Did this page help you?
This is the balanced symbol equation for the reaction of copper oxide with carbon.
2CuO + C → 2Cu + CO2
What happens to the copper oxide in this reaction?
It is neutralised.
It is oxidised.
It is reduced.
It is thermally decomposed.
Did this page help you?