This document discusses pure substances and mixtures. A pure substance is composed of only one substance, while a mixture is composed of two or more substances. Mixtures can be either homogeneous, where the components cannot be distinguished, or heterogeneous, where the components can be distinguished. Common homogeneous mixtures include solutions like coffee, milkshakes, and orange juice. Common heterogeneous mixtures include mixtures like salads, fruit salads, and paellas where the individual components are visible.

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.