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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
pressure on the surface of a gas is increased.what will happen to the inter particle forces?
what happens when a liquid is heated?
what is density?
please answer thisquestion faster ........ my mam is taking a surprise test on every saturday from chapters completed pls experts quick.
Differentiate between gas and vapour..
why does the smell of the lighted incense stick reaches several metres away?
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
why evaporation is called surface phenomenon?
Describe an activity to show that particles of matter are continuously moving.
Q1. Draw diagram to show the set up of the melting point of ice and the boling of water?
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
Ordinary water boils at 100 degree c.can it be made to boil at 95 degree c. or 105 degree c. ?
why do we see water droplets on the outer surface of a glass containing ice cold water
why do the states of matter differ ?
what are the characteristics of the particles of matter???
What happens to the kinetic energy of particles when heat energy equal to latent heat of fusion is supplied to a solid at its M.P ? Explain .
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.
in which of the following substance you expect strongest and in which weakest intermolecular force?why
water, alcohol, sugar , sodium chloride and carbon dioxide
How to show the sublimation of ammonium chloride???
Name the property of gases due to which it is possibleto fill CNG in cylinders for using as fuel in cars?
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.
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
Define latent heat of fusion
how can show that particles matter have spaces between them?
co2 is a gas under normal conditions of temperature and pressure can be liquidified by compressing it to 70 atm at ordinary temperature.what happens when pressure is suddenly realsed?
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
What of the following substance in the gaseous state should be called a vapour?
1.oxygen 2.flourine 3.chlorine 4.iodine
why does the temperature of a substance remain constant during its melting point or boiling point ?
is it possible to liquify atmospheric gases? if yes suggest a method?
activity to show that gases are highly compressible than solids and liquids ?
examples of application of evaporation used in our daily life
The space between the constituent particles are maximum in gases.Give reason.
do an activity to show that particles of matter are very small beyond our imagination
suggest an experiment to demonstrate the compressibility of gases and liquids
why do trees acquire more leaves during summer?
1. Why should curd and sour substances not be kept in brass and coppervessels?
what happens when a liquid is heated ?
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.
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.
Why do solids generally lack the property of diffusion?
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
Roads filled with snow are cleared using either common salt or magnesium chloride or calcium chloride or a mixture of these.These chemicals have damaging effects thus, potassium acetate is preferred.
1.How does common salt(sodium chloride) or other damaging chemicals help in clearing snow from roads?
2.At what temp. common salt and at what temp.magnesium chloride or sodium chloride is effective?
3.Discuss the damaging effects of these chemicals on the environment and how does the use of potassiumacetate remove these damaging effects?
name the solute and solvent of tincture of iodine
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
what type of clothes should we wear in summer why
Explain why the heat becomes unbearable after the rains during summer?
Explain with the help of activity the particulate nature of matter.
explain whether the following statement is true or false?
"sublimation occurs only when the solid is heated''
describe an activity to show that matter is composed of particles
what is the difference between evaporation and cooling
how to download exam idea book for class9
Why do the particles of sugar dissolve in water but not in mustard oil?
What is the difference between Gas and Vapour?
With the help of a diagram describe an activity to show that the states of water can be changed from solid to liquid and then to its ggaseous state.Explain the terms latent heat of fusion and latent heat of vapourisation. How will you change the water from its gaseous stste to its liquid state suggest a simple activity?
State 2 characteristics of matter demonstrated by:
(b) brownian motion
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
The melting point of 3 liquids are 280K , 320K, and 360k. The order of intermolecular force of attraction between these three liquid A,B,C are in the order BCA. label the B.P of each liquid
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
what is the effect of rate of diffusion on density of liquid??
4 substances that sublime
name the temperature at which the solid and liquid states of substance can exist together
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 ?
q1. coconut oil freezes in winters and liquefies in summers this example show what kind of phenomenon
q2. what is bulk phenomenon?
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?
When 50 gm of sugar is dissolved in 100 ml of water, there is no increase in volume. what characteristics of matter is illustrated in this observation?
how does applying pressure help in liquefaction of a gas?
Give two factors which determine the rate of diffusion a liquid on another liquid.
a gas exerts pressure on the walls of the container?why?how?
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