Chemistry

Matter in Our Surroundings

Question:

What is the scientific name of particles which make up matter ?

Answer:

Atoms or Molecules
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Matter in Our Surroundings

Q 1.

Define matter.

Q 2.

What do you mean by change in state?

Q 3.

Why is light not considered matter?

Q 4.

What is SI unit of temperature? Give mathematical relation also.

Q 5.

Define transpiration.

Q 6.

What is evaporation? Why does evaporation cause cooling?

Q 7.

Which of the following are matter?
Chair, Air, Love, Smell, Hate, Almonds, Thought, Cold, Cold drinks, Smell of perfume

Q 8.

Define the term Volatile Liquid.

Q 9.

Which state of matter is most easily compressible?

Q 10.

How matter is classified in terms of physical state?

Q 11.

Define Density.

Q 12.

How can matter change its state?

Q 13.

What are the ways a gas can be liquefied?

Q 14.

What do you mean by the following terms:
a. Evaporation
b. Sublimation
c. Condensation

Q 15.

What do you mean by the term Volume?

Q 16.

Define Latent Heat of Fusion and Latent Heat of vaporisation.

Q 17.

List any five physical properties of liquids.

Q 18.

Our own bodies contain examples of all three states of matter. Can you identify these?

Q 19.

Arrange the following substances in increasing order of intermolecular force of attraction: water, sugar, oxygen

Q 20.

What are the differences between boiling and evaporation?

Q 21.

Why solids cannot be compressed like gases?

Q 22.

Explain compressibility in gases with an example?

Q 23.

How matter is classified in terms of composition?

Q 24.

Define evaporation.

Q 25.

The mass per unit volume of a substance is called density (density=mass/volume). Arrange the following in order of increasing density:
Air, Exhaust from chimneys, Honey, Water, Chalk, Cotton and Iron.

Q 26.

What is the physical state of water at the following temperatures? (a) 25 °C (b) 0 °C (c) 100 °C

Q 27.

Why do diffusion become faster at higher temperatures?

Q 28.

Convert the following temperature to Celsius scale: (a) 300 K (b) 573 K

Q 29.

What are the characteristics of matter?

Q 30.

Why does the temperature of a substance remain constant during melting and boiling even when heat is being supplied to it continuously?

Q 31.

In which case evaporation of water will be faster i.e. near the sea or far away from the sea.

Q 32.

Define the following terms:
a. Melting point
b. Freezing point
c. Boiling point

Q 33.

Why does steam cause more severe burns than boiling water, though both are at the same temperature?

Q 34.

How vapour is different from gases? Give examples of each.

Q 35.

Which of the following state does not exist at room temperature conditions: a) Solids b) Liquids c) Gas d) Plasma

Q 36.

Why do gases diffuse rapidly?

Q 37.

Why is ice at 273 K more effective in cooling than water at the same temperature?

Q 38.

Convert the temperature of 573 K to the Celsius scale.

Q 39.

What factors affect the rate of evaporation?

Q 40.

A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Q 41.

Give reasons to justify: (a) Water at room temperature is a liquid. (b) An iron almirah is solid.

Q 42.

What are the conditions for 'something' to be called 'matter' ?

Q 43.

The Kelvin scale temperature is 0 K. What is the corresponding Celsius scale temperature ?

Q 44.

What is the scientific name of particles which make up matter ?

Q 45.

Write the relation between Kelvin scale and Celsius scale of temperature.

Q 46.

Give reasons for the following observations. The smell of hot sizzling food reaches you several meters away, but to get smell from cold food you have to go close.

Q 47.

Explain with an experiment to show gases do not have fixed shape or volume.

Q 48.

What causes evaporation?
OR
Explain evaporation and its cooling effect in terms of kinetic energy of particles.

Q 49.

Is smell of garlic or perfume a matter?

Q 50.

Why do solids expand a bit on heating and contract a bit on cooling?