Ionic Bonding, Properties And Electrolysis Page 2
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1
2Electrolysis 1
20. Why do ions go to the oppositely
They are attracted due to the opposite
charged electrode?
charges
21. Where do negatively charged ions go
The positive electrode
during electrolysis?
22. Where do positively charged ions go
The negative electrode
during electrolysis?
An electric current is passed through an
ionic compound either when molten, or
23. Describe the process of electrolysis
dissolved in solution, breaking the
compound into elements.
The solution formed when electrolysis is
24. What is an electrolyte?
carried out on molten or dissolve ionic
compounds
Electrolysis 2
25. Write a half-equation for the reduction
+
–
Na
+ 2e
Na
of sodium
26. What affects which the products
formed during electrolysis at each
The reactivity of the elements involved
electrode?
27. What happens to ions at the positive
Oxidation – the ions lose electrons
electrode?
28. Write a half-equation for the oxidation
-
–
2Cl
Cl
+ 2e
2
of chlorine
29. What happens to ions at the negative
Reduction – the ions gain electrons
electrode?
Uses of electrolysis
Sodium hydroxide – soap production,
30. What are the products of electrolysis of
chlorine – bleach and plastics, hydrogen –
sodium hydroxide used form?
manufacturing margarine.
Electroplating objects e.g. with copper or
31. What is electrolysis used for?
silver
Hydrogen (negative electrode), chlorine
32. What are the products of electrolysis of
(positive electrode) and sodium hydroxide
sodium chloride?
(in solution)
Aluminium at the negative electrode
33. What forms during the electrolysis of
Oxygen at the positive electrode which
aluminium oxide?
then reacts with the carbon in the
electrode to form carbon dioxide
A chemical used in aluminium electrolysis
to lower the activation energy of the
34. What is cryolite?
reaction, so reducing the amount of energy
required
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