Question

Answer the following questions :


1) Air is an example of homogeneous mixture. Give reasons.

2) What is sublimation? What is a sublimate?

3) What do you mean by desirable changes and undesirable changes? Give one example of each.

4) What is an element?

5) Name a non-metal which is lustrous. ​

Answer 1

Answer:

• Air is a homogeneous mixture because it is made up of several different gases. The air we breathe has a composition of 78.09% nitrogen, 20.95%...
• Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. ... Sublimation has also been used as a generic term to describe a solid-to-gas transition (sublimation) followed by a gas-to-solid transition (deposition).
• Desirable changes are those changes which we want to occur. These changes are useful for us. For example : ripening of fruits , germination of seeds , change in season etc. Non desirable or Undesirable changes are those changes which we do not want to take place.
• An element is a substance that cannot be broken down into any other substance. There are about 100 elements, each with its own type of atom. Everything in the universe contains the atoms of at least one or more elements. The periodic table lists all the known elements, grouping together those with similar properties.
• Diamond and iodine are two exceptions and are lustrous non-metal.

Explanation:

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