What are compounds? Give two examples.

Short/Brief Note

A compound is a pure substance that is formed when the atoms of two or more elements combine chemically in definite proportions.
Example : H₂O, NaCl,

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Chapter 3: Matter Around Us - Evaluation [Page 39]

Chapter 3 Matter Around Us
Evaluation | Q V. 11. | Page 39

Fill in the blank

In a _______ the substances are not combined chemically.

Write true or false

Handpicking can be used as a separation technique if the particle size of the constituents of the mixture is the same.

Name the elements present in Washing soda

What is the proportion of element present in the following compound?
NO₂

State the information obtained from the formula of a compound.

Assertion: Oxygen is a compound.

Reason: Oxygen cannot be broken down into anything simpler.

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 known to form the largest number of compounds.

Complete the table

The other name for potassium hydroxide is caustic potash.

A compound has a fixed ______.