2. Purity & Formulations

Question 1

What is a pure substance?

Answer 1

A pure substance can be:

. A SINGLE ELEMENT - eg a pure silicon rod or

. A SINGLE COMPOUND - eg Sodium Sulphate

Question 2

A PURE SUBSTANCE IS:

Answer 2

A pure substance is NOT MIXED WITH ANY OTHER SUBSTANCE

Question 3

Is s substance pure? A easy way to measure this is by measuring …

Answer 3

Is a substance pure … measure its boiling or melting point

Question 4

How to you know if a substance is PURE?

Answer 4

A pure substance has a:

FIXED MELTING POINT & A FIXED BOILING POINT

Question 5

IMPURE SUBSTANCES DO WHAT …

Answer 5

Impure substances … MELT & BOIL at a RANGE OF TEMPERATURES

Question 6

What is a FORMULATION?

Answer 6

A Formulation is:

A COMPLEX MIXTURE

It has been DESIGNED for a purpose

The QUANTITIES are carefully measure so we have the correct PROPERTIES that we need

EG of FORMULATIONS ARE :

FUELS, PAINTS, MEDICINES, ALLOYS, FERTILIZERS, CLEANING PRODUCTS