U1-1-2 - Ion-electron and Redox Equations
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When copying equations from the ECS, which one gets reversed?
Higher one gets reversed (OR read equations anticlockwise)
What’s wrong with this redox equation? Ni(s) + SO42−(aq) + 2H+(aq) + H2O(l) ⟶ Ni2+(aq) + SO32−(aq) + H2O(l) + e–
Any of: Still has electrons/charges not balanced Water present on both sides
What must be done before these equations can be added up? Na(s) ⟶ Na+(aq) + e− Cl2(g) + 2e− ⟶ 2Cl−(aq)
Electrons must be balanced (top equation x2) (This is done to balance the charges in the redox equation.)
How do you finish writing this type of equation? Sn3+ ⟶ Sn2+
Add required no. of electrons to the more positive side. Sn3+ + e− ⟶ Sn2+
How would you proceed?
Balance non-oxygen atoms
How would you proceed?
Balance oxygen atoms by adding required no. of H2O molecules
How would you proceed?
Balance no. of H atoms by adding required no. of H+ ions
How would you proceed?
Add required no. of electrons to the more positive side to balance the charges
Suggest a use of oxidising agents
Any of: * Kill fungi and bacteria * Inactivate viruses * Break down coloured compounds (bleaches)
Dichromate and permanganate ions are strong oxidising agents in ________ solutions.
acidic
The reaction below only works if acid is added. Why?
Acid provides H+ ions needed for the reaction