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What do you mean by fluidity?
What is evaporation?
Why does a gas exert pressure?
What determines the state of a substance, whether it will be solid, liquid or gas?
Define specific heat of a substance.
Give Reasons for the Following:
Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
A gas fills completely the vessel in which it is kept?
Why do we see water droplets on the outer surface of a glass containing ice-cold water?
Why should we wear cotton clothes in summer?
Why does a desert cooler cool better on a hot dry day?
Differentiate between solids, liquids and gases with respect to : (a) fluidity (b) kinetic energy (c) density (d) shape (e) rigidity (f) compressibility.
How evaporation differs from boiling?
Differentiate between gas and vapour.
What are the characteristics of the particles of matter?
Give Reasons Only:
A. Water at room temperature is a liquid.
B. Naphthalene balls disappear with time without leaving any solid.
C. We can get smell of perfume several metres away.
What are the factors which affect the rate of evaporation? Explain.
A. What produces more severe burns, boiling water or steam?
B. For any substance, why does the temperature remain constant during the change of state?
A. Give two characteristic properties of a liquid.
B. Why does our palm feel cold when we put alcohol or perfume on it?
C. Give two factors which determine the rate of diffusion of a liquid in another liquid.
Draw a labelled diagram to show the sublimation of Ammonium chloride.
How will you show that, by applying pressure, particles of matter can be brought close together?
Show diagrammatically, the interconversion of the three states of matter.
Ice melts by absorbing heat. When it melts, its temperature remains the same. Where does the heat energy go?
2 ml of dettol is added to a beaker containing 500 mL of water and stirred. State four observations that you can make.
Water is kept in an earthen pot (matka) during summer. Why is it so?
In which state of matter, the process of diffusion is fastest:
Evaporation is called as:
During the evaporation process, the heat is:
Boiling process is a:
The state of matter which is found to be more stable at lower temperature:
The gas can be liquefied by:
Intermolecular forces of attraction are least effective in:
Evaporation of a liquid takes place at:
When water gets solidified into ice, then heat is:
Boiling of a liquid takes place at
Arrange the following in the increasing order of ‘forces of attraction’:
Which condition out of the following increase the evaporation of water.
The property to flow is unique to fluids. Which one of the following statements is correct?
What will be the correct sequence of temperature when 25°C, 46°C and 99°C are converted to the Kelvin scale?
Which is the correct statement?
Write true or false for the following statements:
The movement of tiny particles in a gas or liquid is called Tyndall effect.
The force of attraction between the constituent particles in any form of matter is known as inter-molecular force.
Solids are very rigid and cannot flow from one place to another.
The diffusion in liquids depends upon the thickness (viscosity) as well as on the chemical nature of the diffusing liquids.
The Celsius scale is an absolute temperature scale.
0°C = -273 K
-273°C = 0 K
The term vapour describes the gaseous state of a substance that normally exists as a liquid or solid.
Latent heat means the heat which can be seen easily.
Gases can be liquefied easily by applying pressure and reducing temperature.