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प्रश्न
Give the symbols of: Carbon, calcium, copper, chlorine, cobalt, argon.
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उत्तर
Carbon is C, Chlorine is Cl, Calcium is Ca, Cobalt is Co Copper is Cu, Argon is Ar.
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संबंधित प्रश्न
Classify the following substances into compounds and mixtures:
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
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 |
Is food that we eat a mixture ?
Give three differences between metals and non-metals.
Give two examples of the following.
Non-metals which are solids
Answer the following question:
When iron is mixed with sulphur at room temperature, it does not form a compound. Why?
Tick (√) the correct alternative from the choice given for the following statement
The hardest naturally occurring substance
Write the names of elements from the following symbol:
Cu
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
