Pure substances and mixtures

1. PURE SUBSTANCES AND
MIXTURES
NATURAL SCIENCE
3RD OF PRIMARY

2. PURE SUBSTANCE
• A pure substance is formed only by one substance.
Example: water, salt

3. MIXTURES
• A mixture is something formed by two or more
substances
• There are two kinds of mixtures
• HOMOGENEOUS MIXTURES
• HETEROGENEOUS MIXTURES

4. HOMOGENEOUS MIXTURE
• In this kind of mixture, you can’t distinguish the
components
• Examples:
Puree Coffee Milkshake
Chocolate Cold tomato soup Orange juice

5. HETEROGENEOUS MIXTURE
• In this kind of mixture, you can distinguish all the
components
• Examples:
Salad Fruit salad
Paella
Milk and cereals Chickpeas

6. STATES OF MATTER

7. QUESTIONS
• What’s the name of a substance formed only by one
component?
• What’s the name of a subtance formed by two
substances in which you can distinguish them?
• Is milkshake a homogeneous or a heterogeneous
mixture?
• Is paella a homogeneous or a heterogeneous mixture?
• Is salad a homogeneous or a heterogeneous mixture?

8. ACTIVITIES
1. Classify these substances in mixtures or pure
substances.
2. Classify these mixtures in homogeneous or
heterogeneous
GOLD – SALAD – ORANGE JUICE – WATER – CHOCOLATE – SALT -
MILKSHAKE – CHOCOLATE – FRUIT SALAD - COLD TOMATO SOUP –
ORANGE JUICE – SALAD – PAELLA – PUREE - COFFEE

9. JOURNAL
• Write and draw three examples of heterogeneous
mixture and three of homogeneous mixture.