Pure substances and mixtures

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 Classify these substances in mixtures or pure substances . 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.