Exercise

Sort the following into homogeneous and heterogeneous mixture:
Cereal in milk, blood, salt and water, air, smog, rain, soil, orange juice, sand and water, lemonade, fruit salad, cookies and carbonated water.
What fraction of the total is the homogenous mixture and the heterogeneous mixture? Find the ratio of homogeneous mixture to the heterogeneous mixture. 

Solve the given crossword puzzle.

Across:

4. The scientific name for a substance that dissolves in the solvent.

5. Dissolving can be sped up by doing this.

6. Forms when a solvent evaporates from a saturated solution.

8. Formed when a solute dissolves in a solvent.

10. Formed when two or more atoms join together chemically.

12. Made from different substances that are not chemically joined.

15. Used to separate 2 liquids when one has a different boiling point than the other (two words)

16. A substance made from two or more different elements that have been chemically joined.

17. Used to separate a solid mixed with a liquid.

19. A solution that contains only a small amount of solute is said to be this.

Down:

1. Consists of atoms all with the same proton number.

2. Adding more solute to a solution will make it more_____.

3. Used to separate a solid dissolved a liquid when you want to collect both the solid and the liquid. 

7. The technique used to separate a mixture of 2 or more coloured pigments.

9. Substances that dissolve are said to be_____.

11. The technique used to recover a solid dissolved in a liquid.

13. The liquid that dissolves solutes.

14. A solution will become this when no more solute will dissolve into it.

18. Substances that do not dissolve are said to be_____.

A teacher explained the various separation techniques to her students. Now in order to test them that how well they understood the concept, she made them do an activity.
A sample of mixture A and B was provided to the group A and group B of the students respectively. They were asked to apply their knowledge and come up with a plan to separate the components of these mixtures. The following are the components of the two mixtures:

Mixture A : Water, sulphur and iron filings.

Mixture B : Rice, sugar and husk.

Can you help students to separate the constituent of two mixtures?

Lemonade is prepared by mixing lemon juice and sugar in water. You want to add ice to cool it. Would you add ice to the lemonade before or after dissolving sugar? In which condition would it be possible to dissolve more sugar? Give reason in support of your answer.

Complete the crossword puzzle with the help of the given clues.

Down

1. The process used to separate grains from stalks.

3. The process of changing water into water vapour.

4. A solution in which no more solute can dissolve at a given temperature.

Across

2. The substances that remains in the filter paper.

5. The process of changing water vapour back into liquid water.

6. The substance that flows through the filter paper.

7. A mixture of solute and solvent.

Can we separate mud from muddy water using a sieve? How small should the pores of the sieve be to do this? Use a cloth as a sieve and try to do this.

After using the filter paper to filter water what do you find.

Look at the table given below:

Which parts of the magnet are the poles?

A toy car (made of soft iron) and two bar magnets are arranged as shown in the figure. What would happen if magnet 'A' moved towards the car as shown in the figure?