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Question
Match the following.
| 1. | Element | Made up of molecules |
| 2. | Compound | Impure substance |
| 3. | Colloid | Settles down on standing |
| 4. | Suspension | Pure substance |
| 5. | Mixture | Made up of atoms |
Match the Columns
Solution
| 1. | Element | Pure substance |
| 2. | Compound | Made up of atoms |
| 3. | Colloid | Made up of molecules |
| 4. | Suspension | Settles down on standing |
| 5. | Mixture | Impure substance |
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The constituents of a mixture are present in
- a fixed ratio
- a variable ratio,
- the ratio of 2: 1
- none of these
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Define the term: Element
Give reason: Graphite is used to make a lead of the pencils.
Find the atomicity of the Following molecule:
Acetic Acid
Indicate whether the following statement is true or false:
Molecules can exist independently.
Write the names of elements from the following symbol:
Br
Select the correct answer to the statement given below:
A non-metal which exists in the liquid state.
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
What are elements? What are they made of?
