Chapter 23

Question 1

Reduction is..

Answer 1

The gain of electrons/decrease oxidation numbe

Question 2

Oxidation is…

Answer 2

Loss of electrons / increase in oxidation number

Question 3

What is an oxidising agent?

Answer 3

Takes electrons from oxidised species

Question 4

What is a reducing agent?

Answer 4

Species which adds electrons to species being reduced

Question 5

What does a voltaic cell do?

Answer 5

Convert chemical energy into electrical energy

Question 6

What happens if two half cells mix?

Answer 6

Electrons flow in uncontrollable way and heat energy is released

Question 7

In an ion half cell what electrode is used?

Answer 7

Inert metal, platinum.

Question 8

Which electrode loses electrons in a cell?

Answer 8

The one with the more reactive metal, negative electrode

Question 9

Which electrode in a cell gains electrons?

Answer 9

The less reactive metal, positive electrode

Question 10

Standard conditions in cells

Answer 10

1moldm-3
298k
100kPa

Question 11

What is the electrode potential of a hydrogen electrode?

Answer 11

0V

Question 12

What does a more negative E value mean?

Answer 12

• Greater tendency to loose electrons and be oxidised
• Less tendency to gain electrons and be reduced

Question 13

The more positive E Value means?

Answer 13

• The greater the tendency to gain electrons and be reduced
• The less the tendency to lose electrons and become oxidised