Electrochemistry

Question 1

When an atom has lost an electron, it is said to have been _____________

Answer 1

oxidized

Question 2

When an atom has gained an electron, it is said to have been _____________

Answer 2

reduced

Question 3

Since both reduction and oxidization reactions happen at the same time, they are commonly referred to as _______ reactions

Answer 3

redox

Question 4

Mnemonic to remember which gains and losses

Answer 4

OIL RIG

Question 5

Donates electrons and becomes oxidized.

Answer 5

reducing agent

Question 6

Accepts electrons and becomes reduced.

Answer 6

oxidizing agent

Question 7

elements that are __________ on the activity series are more likely to donate electrons

Answer 7

higher

Question 8

elements that are __________ on the activity series are more likely to receive electrons

Answer 8

lower

Question 9

Occur without the need of additional energy input, result in liberation of electric energy

Answer 9

Spontaneous reactions

Question 10

Require the input of electrical energy to proceed

Answer 10

non-spontaneous reactions

Question 11

The order of the activity series is based on the ____________ ___________ values of most metals from most negative to most positive

Answer 11

electrical potential

Question 12

Useful in identifying red/ox agents

Answer 12

Oxidation number

Question 13

the oxidation state of any pure element in its natural state is _________

Answer 13

zero

Question 14

the oxidation number of a monatomic ion is equal to its ________

Answer 14

charge

Question 15

the oxidation number of oxygen is ______ except in __________ where it is ______

Answer 15

-2, peroxides, -1

Question 16

the oxidation number of hydrogen is ______ except in __________ where it is ______

Answer 16

+1, metal hydrides, -1

Question 17

the oxidation number of halogens is always ______ unless they form compounds with oxygen (except fluorine its always ______)

Answer 17

-1

Question 18

Alkali metals have an ON value of _______

Answer 18

+1

Question 19

Alkaline metals have an ON value of _______

Answer 19

+2

Question 20

the sum of oxidation numbers in a _________ molecule is always zero

Answer 20

neutral

Question 21

the sum of oxidation numbers in a charged molecule is the ______________

Answer 21

charge of the molecule

Question 22

Every redox reaction consists of a ______________ half and a _______________ half

Answer 22

oxidation, reduction

Question 23

ALthough the conservation of mass is upheld, redox reactions must also conserve _____________

Answer 23

charges

Question 24

A spontaneous redox reaction can be used to generate a flow of electrons called a ______________ or _________________ cell

Answer 24

galvanic, voltaic

Question 25

______________ cells are used to harness the energy of a redox reaction. This is done by physically seperating the chemicals into two _____________

Answer 25

galvanic, half-reactions

Question 26

The electrons generated by the _______________ half-reaction must flow through a _______________ before they can be used in the ________________ half-reaction

Answer 26

oxidation, conductor, reduction

Question 27

Allows the flow of ions to prevent a charge build up and completes the circuit

Answer 27

Salt bridge