The 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. There are two types of mixtures: homogeneous mixtures, where the components cannot be distinguished, and heterogeneous mixtures, where the components can be distinguished. Examples of homogeneous mixtures include milkshakes and purees, while examples of heterogeneous mixtures include salads and paellas.

1. PURE SUBSTANCES AND
MIXTURES
Natural Science 4th 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. 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?

7. 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

8. JOURNAL
 Write and draw three examples of
heterogeneous mixture and three of
homogeneous mixture.