CI-Nitrogen chemistry

Question 1

What kind of bond does N2 have? How does this affect its properties?

Answer 1

Triple covalent
unreactive

Question 2

2 types of compounds nitrogen is incorporated into in order to be useful

Answer 2

Fertilisers-plant growth
NH3-Haber process

Question 3

Shape of NH3

Answer 3

Pyrimidal, 107 degrees

Question 4

Shape and bond angle of NH4+

Answer 4

Tetrahedral, 109.5

Question 5

name and appearance of N20

Answer 5

Dinitrogen (I) oxide, colourless gas

Question 6

Where does N2O come from

Answer 6

Bacteria in soil

Question 7

Name and appearance of NO

Answer 7

Nitrogen (II) oxide, colourless gas

Question 8

Where does NO come from

Answer 8

car exhausts-> high T+ P in engine, N and O from air
Lightning

Question 9

Name and appearance of NO2-

Answer 9

Nitrogen (IV) oxide, brown gas (toxic)

Question 10

Where does NO2 come from?

Answer 10

Oxidation of NO in air

Question 11

Name the two nitrate ions
NO3-
NO2-

Answer 11

Nitrate (v)
Nitrate(III)

Question 12

Shape of
NO3-
NO2-

Answer 12

NO3-= trigonal planar
3 bonding sets of electrons
NO2-= non linear
2 bonding pairs, 1 lone pair

Question 13

How to test for NO3- ions

Answer 13

Add NaOH
Add Devarda’s alloy
warm gently
test gases with damp red litmus paper
Positive result- gas evolved turns damp red litmus paper blue (NH3 formed)

Question 14

How to test for NH4+ ions

Answer 14

Add NaOH
NH4+ +OH–> NH3+H2O
Warm gently
Test gas with damp red litmus paper
Positive result- gas evolved turns damp red litmus paper blue (NH3 formed)