electrochemistry

Question 1

What is the oxidation number?

Answer 1

A number given to each atom or ion in a compound to keep track of how many electrons they have

Also known as oxidation state

Question 2

What does a positive oxidation number indicate?

Answer 2

Loss of electrons

Question 3

What does a negative oxidation number indicate?

Answer 3

Gain of electrons

Question 4

What is the oxidation number of any uncombined element?

Answer 4

Zero

Question 5

What is the oxidation number for Group 1 elements in compounds?

Answer 5

+1

Question 6

What is the oxidation number for Group 2 elements in compounds?

Answer 6

+2

Question 7

What is the oxidation number of fluorine in compounds?

Answer 7

-1

Question 8

What is the oxidation number of hydrogen in hydrides like NaH?

Answer 8

-1

Question 9

What is the oxidation number of oxygen in peroxides?

Answer 9

-1

Question 10

What is the oxidation number of oxygen in F2O?

Answer 10

+2

Question 11

What is the oxidation number of an element in a monoatomic ion?

Answer 11

Always the same as the charge

Question 12

What is the sum of the oxidation numbers in a neutral compound?

Answer 12

Zero

Question 13

What is the sum of the oxidation numbers in an ion?

Answer 13

Equal to the charge on the ion

Question 14

In a compound or ion, which element has the negative oxidation number?

Answer 14

The more electronegative element

Question 15

What is oxidation?

Answer 15

Gain of oxygen, loss of hydrogen, or loss of electrons

Question 16

What is reduction?

Answer 16

Loss of oxygen, gain of hydrogen, or gain of electrons

Question 17

What does the acronym OIL RIG stand for?

Answer 17

Oxidation Is Loss, Reduction Is Gain

Question 18

What is a redox reaction?

Answer 18

A reaction in which oxidation and reduction take place together

Question 19

What is a disproportionation reaction?

Answer 19

A reaction in which the same species is both oxidised and reduced

Question 20

What is an oxidising agent?

Answer 20

A substance that oxidises another atom or ion by causing it to lose electrons

Question 21

What happens to the oxidation number of an oxidising agent?

Answer 21

It decreases

Question 22

What is a reducing agent?

Answer 22

A substance that reduces another atom or ion by causing it to gain electrons

Question 23

What happens to the oxidation number of a reducing agent?

Answer 23

It increases

Question 24

How are Roman numerals used in chemistry?

Answer 24

To show the oxidation states of transition metals with multiple oxidation numbers

Question 25

What is the systematic name for FeCl2?

Answer 25

Iron(II) chloride

Question 26

What is the systematic name for HClO4?

Answer 26

Chloric(VII) acid

Question 27

What is the systematic name for NO2?

Answer 27

Nitrogen(IV) oxide

Question 28

What is the systematic name for Mg(NO3)2?

Answer 28

Magnesium nitrate

Question 29

What is the systematic name for K2SO4?

Answer 29

Potassium sulfate