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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
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 do the doctors advise to put strips of wet cloth on thr forehead of a person having high fever?
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 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..
why does food cooks faster on pressure cooker?
why evaporation is called surface phenomenon?
Describe an activity to show that particles of matter are continuously moving.
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???
(d) petrol alcohol kerosene oil Water
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
how can we seperate mixture of iodine and ammonium chloride
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?
State the characteristic property of matter due to which it does not need a container for holding it.
(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 ?
what is the chemical name of dry ice? why is it called dry ice?
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
Is SMELL a matter or not.
if yes,explain how?
why do trees acquire more leaves during summer?
1. Why should curd and sour substances not be kept in brass and coppervessels?
give reason water at room temperature is a liquid
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
Which of the following pairs will not exhibit diffusion?
1.hydrogen,oxygen 2.oxygen,water 3.salt,sand 4.sugar.water
A wooden table should be called a solid give reason
is wind matter or non matter?
(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.
what is the effect of pressure on physical state of matter? explain with an example of gas
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
is rubber band a solid.then why it changes its shape on streaching
name the solute and solvent of tincture of iodine
ice is a solid at 0 degrees celsius but water is a liquid at room temperature. why?
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
The temperature remains constant during the boiling of water even though heat is supplied continously.Why?
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
1)What happens to the distance between the molecules of CNG when the cylinder of CNG is slowly used up?
4 substances that sublime
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
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
Why the boiling is known as the bulk phenomenon ?
How will you justify that ice , water and steam are the three states of a substance and not different substances?
In the formation of a solution heat Is either absorbed or evolved to form a homogeneous mixture? yet a solution is not taken as a compound ? How will you justify this?
why should we wear cotton clothes in summer?
why do we need pressure cooker to cook rice at hill stations
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?
a gas exerts pressure on the walls of the container?why?how?
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