Year 11 Mock revision

6

Electrolysis plays an important part in extracting some metals from their ores e.g. ______________ and in purifying others e.g ___________ . (see diagrams in hints).
a) Define what is meant by the term electrolysis. 
Electrolysis is __________________  of a substance using an _____________ current 
Which metals are obtained from their ores by electrolysis. 
Reactive metals at the ________  of the reactivity series (above ___________) .

Other Answer Choices:

electric

top

copper

carbon

aluminium

decomposition

5

 Write balanced, ionic equations to show the electrode reactions which occur when copper is purified. 
At the anode (where ______________  takes place) Cu → Cu²⁺ + 2e⁻ At the  ____________ (Where reduction takes place) Cu²⁺ + 2e⁻ → Cu)
The mass of the cathode will ______________less than the mass of the anode will _____________ as impurities accumulate below the anode as ___________ .

Other Answer Choices:

decrease

increase

oxidation

sludge

cathode

1

The particles that are responsible for the conductivity of electricity in metals are ______________  The particles that are responsible for the conductivity of electricity in electrolytes are _________ 
The electrolysis of dilute sulphuric acid using inert electrodes produces two gases as products. 

Name a material which could be used as the electrodes in this experiment. _____________
  Name the gas formed at the  anode ___________ (4OH⁻→ O₂ + 2H₂O + 4e⁻)
Name the gas formed at the cathode _____________ .( 2H⁺ + 2e⁻ → H₂)

Other Answer Choices:

hydrogen

oxygen

electrons

Graphite

ions

4

 The term is used to describe a reaction which gives out heat is _______________ .
b) When drops of water are added to anhydrous copper sulphate heat is given out. 
Describe what would be observed during this reaction.
The __________ solid would turn blue 
The addition of water to anhydrous copper sulphate is called Hydration
The anhydrous copper sulphate can be heated to remove the water of hydration so this reaction is an example of a _______________  reaction.
The forward and reverse reactions are not, however, both occurring at the same rate so this is not an example of ____________  equilibrium.

Other Answer Choices:

Exothermic

reversible

white

dynamic

8

 Temperature changes in chemical reactions
Heat is also given out during the reaction of sodium hydroxide with hydrochloric acid. 
Give a balanced symbol equation for this reaction.
NaOH + HCl → _________  + H₂O. 
The reaction of an acid with an alkali is called ___________________ .
The __________  reaction of zinc with copper sulphate solution also gives out heat. Describe what would be observed during this reaction. 
The _________  zinc would become coated with red/ __________ copper metal. 
The _________  copper sulfate solution colour fades and zinc disappears
The formula for this _________________  and redox reaction is
Zn + CuSO₄ → __________  + Cu

Other Answer Choices:

brown

ZnSO₄

redox

Neutralisation

blue

grey

NaCl

displacement

1

Changing conditions for the Haber process
N₂ + 3H₂ ⇌ 2NH₃
Exothermic in the forward direction.

NH₃ is removed
N₂ is added
H₂ is added
Pressure is increased (4:2)
Temperature decreased
NH₃ is added
N₂ is removed
H₂ is removed
Pressure is decreased
higher temperature
Fe Catalyst added

Shifts equilibrium to the left
Shifts equilibrium to the right
No change

1

Solid lead (II) bromide does not conduct when solid as the _________ are not free to move in the electrolyte.

This is described as oxidation because the Bromide ions have lost ______________ .

Other Answer Choices:

ions

electrons

1

https://www.sciencephoto.com/media/718050/view/electrolysis-of-molten-lead-bromide
Pb²⁺ + ________  → _______ 
The product would be ___________  coloured lead liquid.

Other Answer Choices:

Pb

silver

2e⁻

3

Note answer to 3 sig figs.
a) _______ (RFM = 18)
b) _______ (RFM = 58)
c) _______ (RFM = 17)

Year 11 Mock revision

Changing conditions for the Haber processN₂ + 3H₂ ⇌ 2NH₃Exothermic in the forward direction.

Changing conditions for the Haber processN₂ + 3H₂ ⇌ 2NH₃Exothermic in the forward direction.

Changing conditions for the Haber process
N₂ + 3H₂ ⇌ 2NH₃
Exothermic in the forward direction.

Changing conditions for the Haber process
N₂ + 3H₂ ⇌ 2NH₃
Exothermic in the forward direction.