Galvanic cells as a source of energy

Question 1

Redox chemistry and galvanic cells

Galvanic cells

Answer 1

Galvanic cells are mechanism by which we can use chemical energy to generate electricity

Question 2

Oxidation is a ___ of electrons

Reduction is the ___ of electrons

Answer 2

loss

gain

Question 3

A substance is oxidised if an atom within it encounters an ______ in oxidation number
A substance is reduced if an atom within it encounters a ______ in oxidant number

Answer 3

increases

decreases

Question 4

Oxidant number rules
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-
-
-

Answer 4

• the oxidant number of an element is 0
• The oxidant number of h in a compound is always +1
• The oxidant number of o in a compound is -2
• The oxidant number of F in a compound is always -1

Question 5

Primary cells

Answer 5

These are not rechargeable because the products migrate away from the electrodes after the reaction

Question 6

In the electrochemical series look for the strongest oxidant….
and the strongest reduction….

Answer 6

• This substance on LHS closest to the top

- The substance on the RHS closest to the bottom

Question 7

Function of a salt bridge

Answer 7

balances the charge in the cell

Question 8

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-

Answer 8

• Electrodes made out of metal
• Electrodes made out of an inert electrode
• Electrodes made out of an inert electrode and a gas chamber

Question 9

What is the E°

Answer 9

is the maximum potential difference between two half cells. E° = E oxidant - E reductant

Question 10

The anode (-) is the electrode which _____ occur the ______ is the electrode which reduction (+)occurs

Answer 10

Oxidation

cathode