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10 examples of evaporation in daily life with explanations?
why is evaporation called a surface phenomena
why do the doctors advise to put strips of wet cloth on thr forehead of a person having high fever?
why does steam cause more severe burns than boiling water
liquids have lower density than water but ice floats on water why
what is the meaning of fixed volume
Differentiate between gas and vapour..
In which state of matter, diffusion is (a) fastest ,(b) slowest . explain?
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
which organelle is called 'digestive bag'?why is it so called?
why evaporation is called surface phenomenon?
Describe an activity to show that particles of matter are continuously moving.
why does the smell of the lighted incense stick reaches several metres away?
explain why,ice at 0 degree celcius more effective in cooling than water at the same temperature?
what is the effect of pressure on physical state of matter? explain with an example of gas
compare in tabular form, the properties of solid,liquids,and gases with respect: i)shape ii)volume iii)commpressibilty iv)diffusion v)fluidity or ridgidity
change of gaseous state directly to solid state without going through liquid state is known as__________________.
why do we see water droplets on the outer surface of a glass containing ice cold water
what are the characteristics of the particles of matter???
explain how human body maintains constant temperature of 37*C(degree celsius) even when outside temperature may be as high as 45*C(degree celsius)
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
why do we need pressure cooker to cook rice at hill stations
Explain why we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.
How to show the sublimation of ammonium chloride???
what is meant by saying that the latent heat of fusion of ice is 3.34 x 105 J/Kg ??
Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy, and density. Also, please compare these properties with solids, liquids and gases.
a compound is regarded as a pure substance while the mixture is not . assign the reason ?
Define latent heat of fusion
how can show that particles matter have spaces between them?
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
why do liquid have fixed volume but no fixed shape
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
why does the temperature of a substance remain constant during its melting point or boiling point ?
Q. Boiling point of water at hilly station like Nainital is lower than that of Delhi?
activity to show that gases are highly compressible than solids and liquids ?
examples of application of evaporation used in our daily life
do an activity to show that particles of matter are very small beyond our imagination
identify solute and solvent in 80%solutionof ethyl alcohol with water
why do trees acquire more leaves during summer?
Why is sodium light and iron hard in nature?
1. Why should curd and sour substances not be kept in brass and coppervessels?
state effect of 1) surface area 2) nature of the liquid on rate of evaporation
is it possible to liquify atmospheric gases ? if yes suggest a method
these question teacher has given for exam coming bt i dont know the answer because it is a difficult question pls expert help me otherwise my teacher will scold me and i will commit suicide pls answer pls
give reason water at room temperature is a liquid
Why does the level of water not change when salt is dissolved in water?
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
which one is the fast process?
(d) none of these
A wooden table should be called a solid give reason
(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, and density.
how does applying pressure help in liquefaction of a gas?
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
calculate the number of molecules in 4g of oxygen.
is rubber band a solid.then why it changes its shape on streaching
name the solute and solvent of tincture of iodine
what type of clothes should we wear in summer why
What is the physical state of water at 0 degree celsius?
Explain with the help of activity the particulate nature of matter.
advantages and disadvantges of transparent aluminum?
describe an activity to show that matter is composed of particles
what happens when a liquid is heated ?
how to download exam idea book for class9
Energy possessed by a body virtue of its motion is called Kinetic Energy.
What is the difference between Gas and Vapour?
State 2 characteristics of matter demonstrated by:
(b) brownian motion
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
4 substances that sublime
What is the process of gas directly changing into a solid called?
How will you justify that ice , water and steam are the three states of a substance and not different substances?
Why the boiling is known as the bulk phenomenon ?
why should we wear cotton clothes in summer?
justify these statements:-
1) sand is a solid.
2) nail polish remover evaporates faster than water.
ICE AT 0 DEGREE CELCIUS APPEARS COLDER TO THE MOUTH THAN WATER AT 0 DEGREE CELCIUS.WHY?
melting points of three substances are A,B,C are 52 degree,175 degree,80 degree. arrange them in the decreasing order of the interparticle force of attraction in each of them. give reason for your answer.
pleaseeee do helppp .......
The interparticle forces are the strongest in -
2) Ethyl Alcohol
3) Carbon dioxide
4) Sodium Bromide
a gas exerts pressure on the walls of the container?why?how?
What is continuous nature of matter?
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