Separation of substances Worksheet-13

Separation of substances Worksheet-13

Crossword:

1. The process of crushing of the harvested stalks using bullocks.
2. The method which is used to separate the unwanted substance present in smaller quantities.
3. If the components are of different sizes, they can be separated by this method.
4. The change of state from gas to liquid form.
5. Cottage cheese is obtained by this method.
6. Mixture of solute and solvent.
7. The ability of a substance to dissolve in a liquid.
8. The process used to separate pebbles and stones from sand at construction sites.

Sequencing:

Arrange the steps in a sequenced manner to perform an experiment to separate mixture of sand and salt.

9. Take the mixture of salt and sand in a test tube. Add water to it and shake it well.
10. Now only salt solution remains in the test tube.
11. Heat the salt water till all the water changes into steam, leaving the salt behind.
12. Salt dissolves in water, whereas sand does not.
13. Sand can be separated using a filter paper.

Arrange the steps in a sequenced manner to separate a mixture of sand and water by filtration with observation and conclusion.

14. Keep this filter paper cone inside the funnel. Place the funnel into the flask.
15. It is observed that sand is retained in the filter paper but water passes through.
16. Fold the piece of filter paper twice to make a cone.
17. Sand and water are separated by filtration.
18. Pour the mixture into the flask through the funnel.

True/False:

1. Sieving is a method used in some homes to separate wheat bran from flour.
2. Manual threshing is done by holding a pile of crop and beating it on a rock.
3. In process of sieving, blowing air causes the paper bits to flow away from heavier rice grains.
4. To remove unwanted harmful particles or unwanted substances, hand-picking method is useful.
5. Separation of substance is done by obtaining ghee by churning milk.
6. The liquid above the sediments is called sedimentary.
7. The process by which two substances are separated by passing the mixture through a filtering device called sedimentation.
8. The separated chaff is used as fodder for cattle.
9. To obtain salt, sea water is collected in shallow pits and allowed to stand.
10. Water and salt both can be separated from salt water by the process of condensation.
11. Changing of a liquid into gaseous form is called evaporation.
12. The factors that can increase the solubility of a solute are stirring and steaming.

Answer:

1. Threshing
2. Winnowing
3. Evaporation
4. Condensation
5. Filtration
6. Solution
7. Solubility
8. Sieving
9. Take the mixture of salt and sand in a test tube. Add water to it and shake it well.
10. Salt dissolves in water, whereas sand does not.
11. Sand can be separated using a filter paper.
12. Now only salt solution remains in the test tube.
13. Heat the salt water till all the water changes into steam, leaving the salt behind.
14. Fold the piece of filter paper twice to make a cone.
15. Keep this filter paper cone inside the funnel. Place the funnel into the flask.
16. Pour the mixture into the flask through the funnel.
17. It is observed that sand is retained in the filter paper but water passes through.
18. Sand and water are separated by filtration.

Answer: True/False

1. True
2. True
3. False
4. True
5. False
6. False
7. False
8. True
9. True
10. False
11. True
12. False