Science Unit 6D: Reversible and irreversible changes

Mixing materials with water or another liquid

Learning objective: mixing materials can cause them to change.

When we make changes to materials by dissolving them in water or another liquid we can sometimes reverse the change. For example, adding salt to water can be reversed by evaporation. Some materials react with a certain liquid (chemical reaction) to make a new material. For example, a new material (concrete) is made by mixing cement with water. You cannot get the cement back once it has been mixed with the water. Other solids may react with a liquid to produce a gas which escapes as bubbles.

If we can change the material back it is called a reversible change, if we cannot change the material back it is called an irreversible change.

What will happen to each of these materials when you mix them water or another liquid?

	1. Water + baking soda	Score

	2. Lemon juice + baking soda	Score

	3. Vinegar + baking soda	Score

	4. Water + salt	Score

	5. Lemon juice + salt	Score

	6. Vinegar + salt	Score

	7. Water + iron filings	Score

	8. Lemon juice + iron filings	Score

	9. Vinegar + iron filings	Score

Click "Finished" to get your score Your score is

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