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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
Differentiate between gas and vapour..
Asolution contain 16g of urea in 120g of solution. What is mass by mass percentage of solution .
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
is wind matter or non matter?
why evaporation is called surface phenomenon?
Describe an activity to show that particles of matter are continuously moving.
Particles in steam at 100 C have more energy than water at the same temperature. Why?
explain why,ice at 0 degree celcius more effective in cooling than water at the same temperature?
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
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???
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
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 happens when a liquid is heated ?
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.
In which state of matter, diffusion is (a) fastest ,(b) slowest . explain?
Define latent heat of fusion
change of gaseous state directly to solid state without going through liquid state is known as__________________.
how can show that particles matter have spaces between them?
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
which of the following solutions will show tyndall effect?
starch solution , sodium chloride solution, tincture iodine , air
why does the temperature of a substance remain constant during its melting point or boiling point ?
activity to show that gases are highly compressible than solids and liquids ?
Name the change of state during the following changes :
1. drying of wet clothes
2. melting of wax when kept in sunshine
3. melting of ice
4. formation of clouds
5. napthalene balls become smaller when kept in air
6. formation of snow
7. evaporation of water
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
the melting point of a substance is below the room temprature. predict its physical state.
why do trees acquire more leaves during summer?
List two differences and two similarities between colloids and suspension.
1. Why should curd and sour substances not be kept in brass and coppervessels?
Which of the following is the most accurate thermometer to determine the melting point of ice or boiling point of water and how?
1) 0.5 degree Celsius thermometer
2) Clinical or doctor's thermometer
3) 1 degree Celsius thermometer
4) Any of the above three
give reason water at room temperature is a liquid
a compound is regarded as a pure substance while the mixture is not . assign the reason ?
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
Give reason why we can easily move our hands in air but not through liquid or solid?
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.
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
is rubber band a solid.then why it changes its shape on streaching
Wet clothes dry up quickly in sun than in shade. Why?
name the solute and solvent of tincture of iodine
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
what type of clothes should we wear in summer why
is it possible to liquify atmospheric gases? if yes suggest a method?
Explain with the help of activity the particulate nature of matter.
with the help of a neat diagram explain the difference in arrangements of particlesin solids,liquids and gases.
describe an activity to show that matter is composed of particles
how to download exam idea book for class9
what is the meaning of fixed volume
What is the difference between Gas and Vapour?
State 2 characteristics of matter demonstrated by:
(b) brownian motion
why is heat energy needed to melt a solid what is this heat energy called
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
what is meant by saying that the latent heat of fusion of ice is 3.34 x 105 J/Kg ??
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
4 substances that sublime
how does applying pressure help in liquefaction of a gas?
How will you justify that ice , water and steam are the three states of a substance and not different substances?
What is the meaning of negligible force????
Why the boiling is known as the bulk phenomenon ?
Name the non- metal used in skin ointments
why should we wear cotton clothes in summer?
(a)If we break a piece of chalk, a wooden block, and an iron nail, we will observe that it is very difficult to break an iron nail, wooden block requires lesser force, while chalk can be broken easily. What can be concluded from these observations? (b)Though sponges can be compressed yet they are considered as solid. Give reasons. (c)Give an example of diffusion of solid in liquid.
ICE AT 0 DEGREE CELCIUS APPEARS COLDER TO THE MOUTH THAN WATER AT 0 DEGREE CELCIUS.WHY?
How many free surfaces do solids, liquids and gases have and why?
a gas exerts pressure on the walls of the container?why?how?
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