Please select a subject first
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Fill in the blank:
_________ is a process to obtain a very pure form of a solid dissolved in a liquid.
Concept: undefined >> undefined
Give one word answer
The process of transferring the clean liquid after the solid settles at the bottom of the container
Concept: undefined >> undefined
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Fill in the blank
A pure substance has definite _______ and constant _________.
Concept: undefined >> undefined
Fill in the blank
Use of a __________ to separate the components of a mixture of solids is based on the difference in the size of the components.
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Fill in the blank.
_________ is used when the constituents of a mixture of solids have a difference in their weights.
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Write true or false
All pure substances have characteristic melting and boiling points.
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Match the columns.
| Column A | Column B |
| 1. To separate grain from chaff | a. filtration |
| 2. To seperat sawdust from water | b. sedimentation and decantation |
| 3. To separate iodine from sodium chloried | c. winnowing |
| 4. To separate iron fillings from sand | d. sublimation |
| 5.It is used to separate sand and water | e.magnetic separation |
| f. handpiicking |
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Differentiate between the following.
solution and suspension
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How can you separate iron metal from non-magnetic impurities ?
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Name the substance you will add to speed up sedimentation.
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Why is filtration a better technique than sedimentation and decantation ?
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What is centrifugation ? Also write the principle on which it works.
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Define chemical reaction.
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State four conditions necessary for chemical reactions to take place.
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Differentiate between in Chemical reaction and chemical equation.
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Fill in the blank:
The substances which undergo chemical change are called _______
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Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
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Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Concept: undefined >> undefined
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Concept: undefined >> undefined
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Concept: undefined >> undefined
