physical and chemical change

Different changes

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1. Which substance can dissolve completely in water? 

Sand

Flour

Salt

2. Substances that dissolve in water are called 

solutions

insoluble

soluble

3. How could you separate a mixture of sand and salt? 

Mix with water, filter, and then evaporate

Mix with water, evaporate and then filter

Filter and then mix with water

4. Will the steam from seawater be salty? 

Yes

No

Some of the steam will be salty

5. Are melting, freezing, boiling, evaporating and condensing ALWAYS reversible changes? 

No

Yes

Only sometimes

6. Which of these is a reversible change? 

Metal rusting

Baking a cake

Freezing orange juice to make an ice lolly

7. Which of these is an irreversible change? 

Candle wax melting

Candle wax burning

Ice cream melting

8. What new materials are formed when a candle burns? 

Melted wax

Water and carbon dioxide and soot

No new materials are formed

9. How could you change burnt paper back into its original form? 

Cool it

Scrape off the soot

You can't

10. Which of these statements is FALSE? 

Freezing is not a reversible change

Heating a substance can cause both reversible and irreversible changes

Dissolving is a reversible change