Combustion of Alcohols

Question 1

The trend in the number of bonds and the change in mass

Answer 1

The higher the number of bonds the less mass change, this is due to all tests having the same amount of time spent being burnt, and due to more bonds more energy must be used to break them, this reduces the mass less as there are more bonds

Question 2

The way that the experiment can be repeated

Answer 2

is by using a ruler to keep the same measurements

Question 3

The use of a draft screen

Answer 3

So as much energy is transferred to a copper container

Question 4

Safety precautions

Answer 4

remove highly flammable materials
Wear goggles for your eyes

Question 5

variables that must be controlled

Answer 5

the timing of which the burner is burning
the height of the copper container
the volume of water in the copper container

Question 6

The mass of the lid should be included

Answer 6

The lids mass will not change, only the alcohol, meaning that you can still measure the mass change