CBSE Class 3 Science Worksheet M

Mixture- means two or more materials mixed up together

Solution- is a mixture of solute and solvent, when the solute dissolves in the solvant.

Separating mixture

There are different ways to separate mixtures.

1. By sieving-Separating the big bits from the small bits.
2. By filtering- Separating solid bits from liquid.
3. By evaporation-Separatingsoluble solids from water.

Separating a mixture of salt, sand and water

There are three steps to separate salt, sand and water.

Step 1- Filter

Step 2- evaporate

Step 3- condense

Reversible and Irreversible changes

A reversible change is when a material changes back to how it was before.

An Irreversible change is when a material turns in to a completely new and different material. The new material cannot be changed back in to what it was before.

Summary questions for section seven

Choose the correct

1.Which one of the following is different from the other?

A.Iron       B.Steel      C. Aluminum

2.The same poles ___________ each other.

A.repel     B.attract    C. both

3.A north and south pole ___________ each other.

A .attract    B. repel

4.Which of the following is reversible change?

1. water turns in to snow
2. wood and paper turn in to ash
3. adding vinegar in to water

5.Which one of the following is irreversible change?

1. Iron rust
2. Melting iron
3. Mixing rice and tomatoes

Fill in the blank space

1. A magnet has __________ and ___________ poles.
2. An __________________ is when a material turns in to a completely new and different materials.
3. Dissolving a solute in water makes a _________________.
4. Cooking an egg is an ___________________ change.
5. ______________ exerts force on other magnetic materials.
6. ______________ is a type of strong magnet.
7. _____________ is a material changes back to how they were before.

Give short answer

1. Write the three steps of separating salt, sand and water.
2. ____________________
3. ____________________
4. _____________________

2. Write two examples for solutions.

__________________________________________

___________________________________________

3. Write the three ways of separating a mixture.
4. ________________ 2. __________________________ 3. ___________________
5. Write some examples of reversible change.
6. _________________________________________
7. _________________________________________
8. _________________________________________
9. Give some examples of things that can dissolve in water.
10. _______________ 2. _____________________ 3. _________________
11. Write two types of magnet.

___________________ ________________________

4. Write some examples of material that are not attracted by a magnet.
5. ______________________     4. _________________________
6. ______________________     5. __________________________
7. _______________________   6. ___________________________
8. Write some examples of irreversible changes.
9. _________________________________
10. _________________________________
11. _________________________________

Define the following terms

1.What is sieving?

__________________________________________________________________

2. What is evaporation? __________________________________________________________________

3. What is filtering? __________________________________________________________________

4. What is reversible change? _________________________________________________________________

5. What is solution? ________________________________________________________________

6. What is irreversible change? ________________________________________________________________

 Explain for the following question

1. Assume you have a mixture of gravel and glitter. How would you separate them?

____________________________________________________________________

2. What do you call a solid that does not dissolve in water?

____________________________________________________________________

3. How can you separate salt from a solution of salt and water?

____________________________________________________________________

4. What happens to sugar if you add it in to a cup of tea?

____________________________________________________________________

5. Assume you evaporate some water by heating it, how can you turn it back in to a liquid?

____________________________________________________________________