Matter in Our Surroundings — Science STD 9 — Question

Which of the following can be called a suspension?

Water purified by the process of evaporation and condensation can contain:

In which case the rate of evaporation is higher:
(1) A test tube filled with water.
(2) China dish filled with water.

The kinetic energy is proportional to temperature, thus evaporation:

The smell of hot sizzling food reaches you several meters away, but to get the smell of the cold food you have to go close.Which property of matter does this activity show:

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is:

1. krypton.
2. kerosene.
3. Carbon steel.
4. Carbon dioxide.

A sample of NH₃ molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:

The element which is not common between the compounds called baking soda and soda ash is:

You are given the following substances with their boiling and melting points.

Substance	Boiling Point (ºC)	Melting Point (ºC)
A	-183	-219
B	445	119
C	78	-15

Point out the physical states of A, B and C at room temperature (30°C).

Naphthalene can be separated for sand:

1. By sublimation.
2. By distillation.
3. By crystallisation.
4. By using water as solvent.