Alkanes

Question 1

When the length of the carbon chain increases why does the mpt and bpt also increases

Answer 1

. Number of electrons increases
. Strength of induced-dipole-dipole increases

Question 2

When the carbon chain becomes more branched why does the bpt and mpt decrease

Answer 2

. Molecules cannot pack together as closely so less surface contact
. Weaker and fewer induced dipole dipole interactions

Question 3

Whats the formula of complete combustion

Answer 3

alkane + oxygen = carbon dioxide + water

Question 4

Whats the formula for incomplete combustion

Answer 4

alkane + oxygen = carbon monoxide + water

Question 5

Why is carbon monoxide deadly

Answer 5

It prevents the Fe2+ ion in haemogoblin in red blood cells from binding with oxygen and the body tissue becomes starved of oxygen

Question 6

How does carbon monoxide affect the planet

Answer 6

its a toxic gas

Question 7

How does nitrogen oxides affect the planet

Answer 7

Adds to acid rain and destruction of forests

Question 8

How does sulphur dioxide affect the planet

Answer 8

Adds to acid rain

Question 9

How does carbon dioxide affect the planet

Answer 9

These prevent heat from escaping the atmosphere and lead to increases in temperatures on Earth( Climate change)

Question 10

Define radical substitution

Answer 10

A type of substitution reaction in which a radical replaces a different atom or groups of atoms

Question 11

Define radical

Answer 11

A species with an unpaired electron

Question 12

What are the reactants/ reagents of radical substitution

Answer 12

Cl2, Br2 or I2

Question 13

What are the conditions of radical substitution

Answer 13

Ultraviolet radiation

Question 14

What are the names of the 3 steps of radical substitution

Answer 14

1) Initiation
2) Propagation
3) Termination

Question 15

Whats a limiting factor of radical substitution

Answer 15

Further substitution