x

Question 1

oxidation number of uncombined element

Answer 1

0

Question 2

combined hydrogen oxidation element

Answer 2

+1

Question 3

combined oxygen oxidation element

Answer 3

-2

Question 4

ion of element oxidation element

Answer 4

ionic charge

Question 5

oxidising agent

Answer 5

gain of electrons

Question 6

reducing agent

Answer 6

loss of electrons

Question 7

what are voltaic cells

Answer 7

• electrochemical cell

- converts chemical energy into electrical energy

Question 8

what do half-cells contain?

Answer 8

chemical species present in a redox half- equation

Question 9

standard electrode potential definition

Answer 9

e.m.f of a half- cell connected to a standard hydrogen half-cell under standard conditions of 298K, solution concentrations of 1 moldm-3, and a pressure of 100kPa

Question 10

the more negative the E value

Answer 10

greater the reactivity of a metal in losing electron

Question 11

the more positive the E value

Answer 11

• greater the reactivity of a non-metal in gaining electrons

Question 12

what are the charge carriers in the wire

Answer 12

electrons

Question 13

what are the charge carriers in the salt bride

Answer 13

ions

Question 14

most negative system

Answer 14

• greater tendency to be oxidised

- lose electrons

Question 15

most positive system

Answer 15

• greater tendency to be reduced

- gain electrons

Question 16

state the limitations of predictions for feasibility based on E values

Answer 16

• reactivity may have a slow rate with high activation energy
• concentration may not be 1 modm-3, changing the E value