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10 examples of evaporation in daily life with explanations?
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
why is evaporation called a surface phenomena
The ratio of specific charge of a proton and alpha particle is
why do the doctors advise to put strips of wet cloth on thr forehead of a person having high fever?
When 3.2 g of Sulphur is vaporized at 450oC and 723 mm pressure, the vapors occupy a volume of 780 ml. What is the molecular formula of sulphur vapours under these conditions? Calculate the vapor density also.
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..
The temperature remains constant during the boiling of water even though heat is supplied continously.Why?
Is SMELL a matter or not.
if yes,explain how?
why evaporation is called surface phenomenon?
explain why,ice at 0 degree celcius more effective in cooling than water at the same temperature?
during evaporation,particles of a liquid change to vapours only
A) from the surface
B) from the bulk
C) from both surface and bulk
D) neither from surface not from bulk
Describe an activity to show that particles of matter are continuously moving.
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
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
why do we see water droplets on the outer surface of a glass containing ice cold water
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
what are the characteristics of the particles of matter???
How to show the sublimation of ammonium chloride???
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.
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.
Define latent heat of fusion
how can show that particles matter have spaces between them?
Describe the process of sublimation and its applications.
(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 ?
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?
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
why do trees acquire more leaves during summer?
ice is a solid at 0 degrees celsius but water is a liquid at room temperature. why?
1. Why should curd and sour substances not be kept in brass and coppervessels?
why does food cooks faster on pressure cooker?
give reason water at room temperature is a liquid
A wooden table should be called a solid give reason
(d) petrol alcohol kerosene oil Water
iron powder and sulphur powder were mixed together and divided into two parts A and B.When part A was heated strongly over a burner,then a substance C was formed.Then part B was not heated at all.When dilute HCl was added to substance C,then gas D was evolved and when dilute HCl was added to part B then gas E was evolved
1)what type of substance is B?
2)what type of substance is C?
3)name the gas D and E?
4)state one characterstic property of gas D?
5)write one test to identify gas E?
PLEASE PLEASE ANSWER FAST,....IMPORTANT ....AND URGENT TOO
(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.
Kelvin scale temperature is regarded as better then celcius scale. assign reason.
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
what are the disadvantages of evaporation?
name the solute and solvent of tincture of iodine
what are the advantages and disadvantages of evaporation
what type of clothes should we wear in summer why
Explain with the help of activity the particulate nature of matter.
how to download exam idea book for class9
which of the following solutions will show tyndall effect?
starch solution , sodium chloride solution, tincture iodine , air
describe an activity to show that matter is composed of particles
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
4 substances that sublime
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
Why the boiling is known as the bulk phenomenon ?
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
How will you justify that ice , water and steam are the three states of a substance and not different substances?
how can we seperate mixture of iodine and ammonium chloride
why should we wear cotton clothes in summer?
ICE AT 0 DEGREE CELCIUS APPEARS COLDER TO THE MOUTH THAN WATER AT 0 DEGREE CELCIUS.WHY?
how does applying pressure help in liquefaction of a gas?
why is a sponge compressible even though it is a solid???
a gas exerts pressure on the walls of the container?why?how?
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