Chemistry- AOS2

Question 1

Redox

Answer 1

redox refers to the movement of electrons through oxidation and reduction reactions

Question 2

Oxidation

Answer 2

loss of electrons
-will always occurs at the anode
(an ox)

Question 3

Reduction

Answer 3

Gains of electrons
-will always occurs at the cathode
(red cat)

Question 4

Oxidant/oxidising agent

Answer 4

chemical species which causes oxidation but is **itself being reduced ** and undergoing reduction reaction
-causes but does not undergo oxidation

Question 5

Reductant/reducing agent

Answer 5

chemical species which **causes another chemical to undergo reduction **but is **itself being oxidised **
-causes but does not undergo reduction

Question 6

electrode

Answer 6

part of a galvanic cell which conducts electrons located in each half cell at the site of oxidation and reduction
-if not a metal: will use inert material (platinum or graphite)
-will be submerged in electrolytic solution

Galvanic cell

Question 7

electrolyte

Answer 7

usually a solution which provides the path for the flow of electrons or ions inside the cell and between half-cells
located in each half cell
-provides ions in solution to complete circuit

Question 8

salt bridge

Answer 8

1. allow each half cell to maintain its neutrality to prevent polarisation
   -acts as an internal circuit to migrate cations to cathode and anions to anode
   -**balances charge **in each half cell
2. **seperates oxidant and reductant **from reacting directly= forces electrons to travel through circuit
3. **completes circuit **
4. *is inert in the galvanic cell to prevent reaction with consituents of either half-cell

Question 9

half-cells

Answer 9

two half-cells make up a whole single galvanic cell where each cell will either undergo oxidation at the anode and the other will undergo reduction at the cathode
-each will contain electrode, electrolytic solution and an external circuit to ocnnect the both

Question 10

Galvanic cell

Answer 10

cell consisting of two half-cells which undergo a spontaneous redox reaction to convert **chemical energy to electrical energy **

Question 11

primary cell

Answer 11

type of galvanic cell which undergoes redox and a type of battery which cannot be recharged and is discarded
ex. button, dry cell

Question 12

seconday cell

Answer 12

type of galvanic cell which undergoes redox and a type of battery which can be recharged

Question 13

Galvanometer

Answer 13

able to measure and detect electrical current

Question 14

Cathode

Answer 14

site of reduction

Question 15

Anode

Answer 15

site of oxidation