Elements, compounds and mixtures - Eduqas

1

What is meant if a chemical substance is described as 'pure'?

2

Which of the following is a property of a compound?

3

Air contains nitrogen, oxygen and argon gas. What term can be used to describe air?

4

How do the melting points of pure and impure substances differ?

5

Which piece of apparatus in a melting point experiment is most likely to cause skin burns if touched?

6

A chemist is making a medicine. Why is it important to use a formulation?

7

Which of the following would you NOT find in the formulation for a processed food?

8

Which of the following is seawater?

9

How many types of atom are present in a mixture of oxygen and carbon dioxide gases?

10

A student heats up solid X. It starts to melt at 35°C, and finishes melting at 40°C. What does this tell you about solid X?