C1 : Elements Compounds and Mixtures

Question 1

Periodic Table

Answer 1

The periodic table shows us the elements
There are around 100 elements
In an element, all the atoms are the same
Each element has a symbol, every symbol starts with a capital letter

Question 2

Compounds

Answer 2

Compounds contain two or more different elements chemically combined in a fixed proportion
Compounds usually have totally different properties to the elements that they’re made from

Question 3

What happens if we want to separate a compound back into its elements

Answer 3

We have to use a chemical reaction to do this

Question 4

Mixture

Answer 4

In a mixture, we have different elements or compounds not chemically combined together

Question 5

What if we want to separate a mixture

Answer 5

We use physical techniques rather than chemical reactions
e.g (filtration, crystillation, distillation)

Question 6

Molecules

Answer 6

A molecule has any elements chemically joined