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WorksheetsAQA GCSE CHEMISTRY - CHEMICAL CHANGES
Total questions: 48
Worksheet time: 24mins
When a metal is reduced by reaction with carbon, which element is removed from the compound?
Carbon
Oxygen
Hydrogen
Silver
What type of compound can undergo electrolysis?
Metallic
Giant covalent
Simple covalent
Ionic
Which electrode do the negatively charged ions move to?
Left
Cathode
Anode
Right
When you electrolyse a molten ionic compound, the product at the cathode is…
a metal
a non-metal
a mixture
a compound
What test and result shows that hydrogen has been produced?
Limewater turns cloudy
A glowing splint relights
It burns with a squeaky pop
Damp blue litmus paper turns red
When an electric current is passed through an electrolyte, the ions move to…
the magnets
the poles
the electrodes
the pipettes
What is made when an acid reacts with a base?
A salt and water only
A salt and carbon dioxide only
A salt and hydrogen only
A salt, hydrogen and carbon dioxide
Oxidation is the… (Higher Tier Question)
loss of electrons
gain of electrons
loss of protons
gain of protons
Most metals are found in the earth as…
elements
mixtures
compounds
atoms
What is an alkali?
An alkali is an acid by another name
An alkali is a base that is soluble in water
An alkali is a type of rock
An alkali is a base that is not soluble in water
Titration is a technique that is used to find the concentrations of…
metals and non-metals
acids and alkalis
acids and metals
alkalis and metals
Oxides are produced when a metal or a non-metal reacts with…
carbon
nitrogen
oxygen
hydrogen
What is special about an ionic compound when it is liquid or in solution?
The ions can move freely
The ions vibrate in a fixed position
The ions move backwards and forwards
The ions cannot move
Substances with a pH between 8 and 14 are…
metallic
alkaline
acidic
neutral
The special word for the positively charged electrode is…
the negative electrode
the cathode
the anode
the positive electrode
What equation is used to find out the concentration of a substance?
m is mass
c is concentration
m = c ∕ v
v = m × c
c = m ∕ v
c = v ∕ m
When a strong acid is in aqueous solution it is completely…
(Higher Tier Question)
electrolysed
ionised
reacted
harmful
What type of salt would you get in a reaction between an oxide and nitric acid?
A sulfate
A nitrate
A chloride
A carbonate
What ions are released by all alkalis and bases when they react with acids?
Hydrogen ion, 1+ charge
Hydrogen ion, 1- charge
Hydroxide ion, 1+ charge
Hydroxide ion, 1- charge
What is the name of the type of reaction between alkalis and acids?
Neutralisation
Deodorisation
Destruction
Fizzy
As pH decreases by 1 unit, the H+ ion concentration increases by a factor of…
(Higher Tier Question)
1
5
10
0
As an acid becomes stronger…
(Higher Tier Question)
More H+ ions disassociate
More OH- ions disassociate
The acid doubles
The H+ and OH- balance
Metals less reactive than carbon are extracted by…
reduction
electrolysis
distillation
cracking
When you electrolyse a molten ionic compound, the product at the anode is…
a metal
a non-metal
a mixture
a compound
Why is an indicator used in an acid/alkali titration reaction?
To show when pH7 is reached
To show the pH of the acid
To show the pH of the alkali
To see the colour change
Electrolysis is used as a method of purifying a metal when the metal is more reactive than…
oxygen
carbon
hydrogen
silver
The special word for ionic compounds that are able to conduct electricity is…
conductors
electrolytes
insulators
solutions
The special word for the negatively charged electrode is…
the negative electrode
the cathode
the anode
the positive electrode
When H+ ions react with OH- ions they produce…
air
oxygen
hydrogen
water
Substances with a pH between 1 and 6 are…
metallic
alkaline
acidic
neutral
For electrolysis to work the ionic compound must…
be a solid
be melted or dissolved in water
have a large surface area
be easy to separate
What type of salt would you get in a reaction between an oxide and sulfuric acid?
A sulfate
A nitrate
A chloride
A carbonate
In a neutralisation reaction, an acid's H+ ions react with…
OH+
OH-
H+
H-
Which electrode do the positively charged ions move to?
Left
Cathode
Anode
Right
Hydrochloric acid plus magnesium react to make…
magnesium oxide
magnesium chloride and water
magnesium chloride and hydrogen
hydrogen and water
Reduction is the…
(Higher Tier Question)
loss of electrons
gain of electrons
loss of protons
gain of protons
Which extraction method for purifying metals involves the use of electricity?
Reduction
Electrolysis
Distillation
Cracking
Substances with a pH of 7 are…
metallic
alkaline
acidic
neutral
When acids are neutralised by metal carbonates, what are the products?
A salt and water only
A salt, water and carbon dioxide
A salt and hydrogen only
A salt, hydrogen and carbon dioxide
What do you need to do in order to get solid salt crystals from a solution of a soluble salt?
Dilute the solution
Shake the solution
Filter the solution
Heat the solution gently
A soluble salt is…
a salt that dissolves in water
a salt that reacts with water
a salt that doesn’t dissolve in water
a salt that turns purple
Which extraction method for purifying metals involves the use of carbon?
Reduction
Electrolysis
Distillation
Cracking
What salt would you get if you added sodium hydroxide to hydrochloric acid?
Sodium sulfate
Sodium nitrate
Sodium chloride
Sodium and water
When metals are reduced by reaction with carbon, the products are a metal and…
oxygen
hydrogen
water
carbon dioxide
What are the products when an acid reacts with a metal?
A salt and water
A salt, water and carbon dioxide
A salt and hydrogen
A salt, hydrogen and carbon dioxide
The charges on the ions in copper(II) oxide are…
(Higher Tier Question)
Cu is 2+, O is 2−
Cu is 2−, O is 2+
Cu is 1+, O is 1−
Cu is 1-, O is 1+
What type of salt would you get in a reaction between an oxide and hydrochloric acid?
A sulfate
A nitrate
A chloride
A carbonate
An example of a strong acid is…
(Higher Tier Question)
hydrochloric acid
ethanoic acid
carbonic acid
benzoic acid
