What are elements? What are they made of?

One Line Answer

Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.
It is made of entirely from one type of atom.

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Chapter 3 Matter Around Us
Evaluation | Q V. 9. | Page 39

Fill in the blank

A pure substance has definite.................. and constant ..............

Fill in the blank

Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.

Is food that we eat a mixture ?

What are the advantages of chromatography?

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 compound used as common salt is

Differentiate between the terms –
elements, compounds & mixtures.

Write the names of elements from the following symbol:

Xe

The diagram represents fractional distillation for the separation of mixtures. Answer the following :

Can two immiscible liquids be separated by this process?
Separation of liquids by this process is based on which physical property?
If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
Give a reason for the above answer.
State the purpose of the fractionating column in the apparatus.

Name the element which is used in toothpaste to strengthen our teeth.