Chemistry

Question 1

Define a compound
Give an example

Answer 1

One type of molecule which contains more than one kind of atom

Calcium carbonate
Carbon dioxide
Potassium maganate

Question 2

Define a mixture
Give an example

Answer 2

Contain more than one kind of molecule

Air

Question 3

Explain the difference between atoms, molecules and elements

Answer 3

Atoms - the smallest particles; ie the building blocks of all substances
Molecules - atoms chemically bound together
Elements - contain only one sort of atom

Question 4

What is the equation for atomic mass?

Answer 4

The mass of one atom of the element ÷ the mass of one atom of hydrogen

Question 5

How do you work out the mass of a molecule?

Answer 5

Add the atomic masses of the atoms present together.
For example carbon dioxide is made of 1 atom of carbon and 2 atoms of oxygen
Therefore 12 + (2 x 16)
= 44