Question:
Convert the following temperatures:
a. -78.0 °C to Kelvins
b. 775 K to °C
c. 489 K to °C
d. 24 °C to kelvins
Answer:
(a) 195 K (b) 502 °C (c) 216 °C (d) 297 K
Matter in Our Surroundings
Q 2.
What do you mean by change in state?
Q 3.
What is SI unit of temperature? Give mathematical relation also.
Q 4.
Why is light not considered matter?
Q 5.
Which of the following are matter?
Chair, Air, Love, Smell, Hate, Almonds, Thought, Cold, Cold drinks, Smell of perfume
Q 6.
What are the differences between boiling and evaporation?
Q 7.
Define transpiration.
Q 8.
What is evaporation? Why does evaporation cause cooling?
Q 9.
How matter is classified in terms of physical state?
Q 10.
Define the term Volatile Liquid.
Q 11.
What do you mean by the following terms:
a. Evaporation
b. Sublimation
c. Condensation
Q 12.
Define Latent Heat of Fusion and Latent Heat of vaporisation.
Q 13.
Which state of matter is most easily compressible?
Q 14.
What are the ways a gas can be liquefied?
Q 16.
What do you mean by the term Volume?
Q 17.
Our own bodies contain examples of all three states of matter. Can you identify these?
Q 18.
How can matter change its state?
Q 19.
List any five physical properties of liquids.
Q 20.
Explain compressibility in gases with an example?
Q 21.
Why solids cannot be compressed like gases?
Q 22.
How matter is classified in terms of composition?
Q 23.
Arrange the following substances in increasing order of intermolecular force of attraction: water, sugar, oxygen
Q 24.
Why do diffusion become faster at higher temperatures?
Q 25.
What is the physical state of water at the following temperatures? (a) 25 °C (b) 0 °C (c) 100 °C
Q 26.
Define evaporation.
Q 27.
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 28.
What are the characteristics of matter?
Q 29.
Convert the following temperature to Celsius scale: (a) 300 K (b) 573 K
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.
What factors affect the rate of evaporation?
Q 39.
Convert the temperature of 573 K to the Celsius scale.
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 the usual name for the following :Heat required to change the state of a substance without changing the temperature.
Q 42.
The Kelvin scale temperature is 0 K. What is the corresponding Celsius scale temperature ?
Q 43.
(a) Define the term 'latent heat of vaporisation' of a liquid. What is the value of the latent heat of vaporisation of water ?
(b) Draw a labelled diagram of the experimental set-up to study the latent heat of vaporisation of water.
Q 44.
What is meant by saying that the latent heat of vaporisation of water is 22.5 x
Q 45.
What is the scientific name of particles which make up matter ?
Q 46.
What is the general name of : (a) rigid form of matter ? (b) fluid forms of matter ?
Q 47.
Give reasons to justify: (a) Water at room temperature is a liquid. (b) An iron almirah is solid.
Q 48.
Convert the temperature of 373°C to the Kelvin scale.
Q 49.
Name the process by which a drop of ink spreads in a beaker of water.
Q 50.
Write the relation between Kelvin scale and Celsius scale of temperature.
