Select Board & Class
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
arrange the gases present in the air in th increasing order of their boiling points.Which gas forms liquid first as the air is cooled?
why does the temperature of a substance remain constant during its melting point or boiling point ?
A piece of chalk can be broken into small pieces by hammering, but it is not possible in case of a piece of iron. explain.
activity to show that gases are highly compressible than solids and liquids ?
The temperature remains constant during the boiling of water even though heat is supplied continously.Why?
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
drop a crystal of copper sulphate into glass of hot water and another containing cold water.do not stir the solution.allow the crystals to settle at the bottom.what do you observe just above the so...
(a) Tabulate the
differences in the characteristics of states of matter.
(b) Comment upon the following: rigidity, compressibility, fluidity,
filling a gas container, shape, kinetic energy...
State the characteristic property of matter due to which it does not need a container for holding it.
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
what is the difference between evaporation and cooling
what type of clothes should we wear in summer why
Explain with the help of activity the particulate nature of matter.
what is matter
What is the difference between Gas and Vapour?
which organelle is called 'digestive bag'?why is it so called?
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
Why does the level of water not change when salt is dissolved in water?
4 substances that sublime
A student takes some water in a beaker and heats it over a flame for determining its boiling point. He keeps on taking its temperature readings. He would observe that the temperature of water:
Why the boiling is known as the bulk phenomenon ?
what does the diffusion of gases tell us about their particles
give one example of diffusion of gases in a liquid
How will you justify that ice , water and steam are the three states of a substance and not different substances?
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