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Question
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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Solution
Use of a sieve to separate the components of a mixture of solids is based on the difference in the size of the components.
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Name the main metal present in the following:
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Give four examples of non-metallic elements.
Why is it named so?
Fill in the blank:
________ and _______ are pure substances.
Fill in the blank
A pure substance has definite _______ and constant _________.
Write true or false
All pure substances have characteristic melting and boiling points.
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 |
Why is filtration a better technique than sedimentation and decantation ?
Write the differences between elements and compounds and give an example for each.
