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Question
Indicate whether the following statement is true or false:
All elements are artificially prepared
Options
True
False
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Solution
False
Correct Statement: All elements are made up of a limited number of basic substances
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RELATED QUESTIONS
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 ?
Define: Compounds
Give one example for the following types of mixtures:
liquid-gas homogenous mixture
Mention three gaseous elements and write their molecular formulae
Find the atomicity of the Following molecule:
Calcium Chloride
Indicate whether the following statement is true or false:
A compound is made up of just one kind of atom
Complete the statement with the correct words.
Acid’s are chemicals which are _____ in taste and derived from plants and ________.
Write the names of elements from the following symbol:
Cu
Give two example of elements.
