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Question
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
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Solution
On heating, sugar powder is charred and becomes black while salt does not char. When dissolved in water, the salt solution will conduct electricity because it is ionic while sugar solution will not conduct electricity because it is covalent.
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ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
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Acetic acid
Fill in the blank:
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What is such a particle called ?
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Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Draw the diagrams representing the atomic structures of the following: Neon
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The smallest particle of matter that can exist by itself is ______.
Define the following term with an example.
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State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Define the following term with an example.
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- Rutherford’s atomic model
- Thomson’s atomic model
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