Yr 10 worksheets
10g5
Complete the rules:
RULES FOR IONIC SOLUTIONS
+ ANODE
Attracts – ions (‘Anions’)
If – ions are HALOGENS ie
chloride Clbromide Briodide Ithe __________ is produced.
If – ions are NOT HALOGENS
Eg sulphate SO42-,
nitrate NO3carbonate CO32__________ is produced.
- CATHODE
Attracts + ions (‘Cations’)
If + ions (metals) are
_______________________
K, Na, Ca, Mg, Zn, Fe
Then __________ is produced
If + ions (metals) are LESS
REACTIVE than hydrogen
Cu, Ag, Au
Then the _______ is produced
Compound
State
potassium chloride molten
aluminium oxide
molten
copper chloride
solution
sodium bromide
solution
silver nitrate
solution
potassium chloride solution
zinc sulphate
solution
Ions
Cathode (-) Anode (+)
K+ Cl-
potassium
chlorine
IONIC SOLUTIONS: At the CATHODE
Na+
H+
H
+
As HYDROGEN is
____ _________than
SODIUM, it is
discharged.
The _______ ions
stay in solution.
Write the half equation for reaction at CATHODE:
Na+
H+
HH+
Na+
IONIC SOLUTIONS: At the CATHODE
Na+
sodium ION, missing
1 electron
H+
hydrogen ION,
missing 1
electron
H
Hydrogen ATOM,
NEUTRAL
+
As HYDROGEN is LESS
REACTIVE than
SODIUM, it is
discharged.
The sodium ions stay
in solution.
Write the half equation for reaction at CATHODE:
which
ions?
Na+
H+
HH+
Na+
2H+ + 2e-
The reactivity series –
can be used to
determine what is
produced at the
cathode
H2
IONIC SOLUTIONS: At the ANODE – halogen compounds
Cl-
O
H
Cl
+
H
H
O
O
Cl
Cl-
Cl-
O
H
O
-
Cl
Cl
Cl-
H
If the – ion is a
HALOGEN (__, Br, __)
it is discharged and
chlorine (or _______
or ______) is given off.
__________ ions stay
in solution
Write the half equation for reaction at ANODE:
2Cl-
2e- + Cl2
IONIC SOLUTIONS: ANODE – non halogen compounds
NO3-
O
H
O
+
NO3H
O
NO3H
O
NO3-
O
H
NO3-
O
If the – ion is NOT a halogen (eg
nitrate, sulphate etc) then the
__________ ions from the water
are discharged to make WATER
and OXYGEN gas. The other ions
stay in solution.
H
Write the half equation for reaction at ANODE:
2OH-
2H2O + O2 + 4e-
1. Label the ions in the key boxes at the top
2. Fill in the blanks
3. Write the half equations at each electrode
4. Complete task sheets
Stick this in here
Electrolysis of Ionic
Solutions
The reactivity series can be used to
determine what is produced at the cathode
Activity 1 - Complete the rules:
RULES FOR IONIC SOLUTIONS
Activity 2 - Complete the table:
Support: Look at the reactivity table at the front of worksheet
Extension: exam questions to complete