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- 1. Multiple Choice
What is a saturated solution?
A solution in which more solute can be added
A solute that has no more space to dissolve a solvent
A solvent in which there is no more space there to dissolve the solute
- 2. Fill in the Blank
For filtration, the particles of the insoluble solid should be ________________ than the holes in the filtering device.
- 3. Multiple Choice
Sieving is used for separating two substances with ________________________ sizes.
A. Different
B. Same
C. Similar
D. Both A nd C
- 4. Multiple Choice
What can increase the solubility of a solvent?
Letting it standstill
By keeping the solvent in the freezer
By decreasing the solvent
By heating the solvent
- 5. Fill in the Blank
A machine that reaps and cleans the crop
- 6. Multiple Choice
Explain the following-
Winnowing-
Beating the crop to separate grains from stalks
Separating grains from the chaff by river
Putting the grains in shallow pits and evaporate them
Separating grains from the chaff by wind
- 7. Multiple Choice
Evaporation is _________________ of condensation
similar
friend
operation
opposite
enemy
- 8. Multiple Choice
Find which is the oldest way of separating salt and seawater
By putting the seawater in a basket and picking up salt
By using filtration
By collecting seawater in shallow pits and letting the water condense
By collecting seawater in shallow pits and letting the water evaporate
- 9. Multiple Choice
What is happening in the following picture
Tea being separated from tea leaves
Putting the tea into the container
Tea used for filtration
Tea being strained
- 10. Fill in the Blank
Solvent + solute=
- 11. Multiple Choice
Define the following-
Solubility-
The ability of a substance to sit still
The ability of a substance to be stirred
The ability of a substance to get dissolved
The ability of a substance to decantate
- 12. Fill in the Blank
When is the separation of substances necessary?
- 13. Multiple Choice
Define-
Sieving
This method is used to differentiate substances that are of different sizes.
This method is used to separate substances that differ in weight.
This method is used to separate substances that are of different sizes.
- 14. Multiple Choice
Handpicking can only be done when the impurities are of different
sizes
colors
weight
height
- 15. Multiple Choice
Define supernatant
The liquid above the decant is called supernatant
The liquid above the filtrate is called supernatant
The liquid above the sediment is called supernatant
The pure liquid after distillation is called supernatant
- 16. Multiple Choice
Bullocks are needed for
Winnowing
Hand picking
Threshing
Sieving
- 17. Multiple Choice
Materials needed for doing evaporation and condensation activity at home?
Saltwater, tub, spoon, gas
Metal plate, refrigerated water, freshwater, container
Gas stove, kettle, metal plate, a pair of tongs, container, burner, pondwater
Seawater, Gas stove, kettle, metal plate, a pair of tongs, container, burner,
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