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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
on heating why does diffusion become faster? (Detailed answer)
liquids have lower density than water but ice floats on water why
Differentiate between gas and vapour..
Why does the level of water not change when salt is dissolved in water?
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
why evaporation is called surface phenomenon?
what happens when a liquid is heated ?
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 liquid have fixed volume but no fixed shape
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???
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
What is the process of gas directly changing into a solid called?
how can show that particles matter have spaces between them?
how does applying pressure help in liquefaction of a gas?
How matter is continuous like a block of wood
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
which of the following substance in the gaseous state should be called a vapour? and why
(c) carbon dioxide
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 ?
examples of application of evaporation used in our daily life
name the temperature at which the solid and liquid states of substance can exist together
do an activity to show that particles of matter are very small beyond our imagination
We cannot cut the running stream of water from tap by our fingers. What property of matter does it Show ?
why do trees acquire more leaves during summer?
A crystal of copper sulphate dissolve quickly in hot water than in cold water ?
1. Why should curd and sour substances not be kept in brass and coppervessels?
A substance has no no mass. can we regard it as matter or not??
change of gaseous state directly to solid state without going through liquid state is known as__________________.
give reason water at room temperature is a liquid
why is a sponge compressible even though it is a solid???
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
why do we need pressure cooker to cook rice at hill stations
A wooden table should be called a solid give reason
What does the following observation explain about the nature of matter?
1.It is difficult to cut the stream of water.
2.We can easily dissolve the sugar/salt in water.
3.It is difficult to break a piece of iron as compared to a piece of chalk.
4.Very few cystals of pottasium permanaganate can impat colour to a vey large volume of water.
5.Fragance of lighted incense stick spreads very fast.
(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 do you mean by negligible compressibility ?
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
What happen when we apply pressure to the particles of matter
is rubber band a solid.then why it changes its shape on streaching
why smell can be even detected even after repeated dilution of dettol in water? pls its urgent
name the solute and solvent of tincture of iodine
why is heat energy needed to melt a solid what is this heat energy called
what type of clothes should we wear in summer why
what is the effect of pressure on physical state of matter? explain with an example of gas
Explain with the help of activity the particulate nature of matter.
describe an activity to show that matter is composed of particles
Although sugar is a solid it takes the shape of the container in which it's kept. Why?
how to download exam idea book for class9
10 g of ice at -10 degree Celsius is added to 10 g of water at 85 degree Celsius. What is the final temperature and amount of ice left in the system?
What is the difference between Gas and Vapour?
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
State 2 characteristics of matter demonstrated by:
(b) brownian motion
Particles in steam at 100 C have more energy than water at the same temperature. Why?
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
how long does it take for honey to dissolve in water ?whay does it take longer time to dissolve than the time taken by ink to dissolve in water ?
4 substances that sublime
How will you justify that ice , water and steam are the three states of a substance and not different substances?
Why do the particles of sugar dissolve in water but not in mustard oil?
Why the boiling is known as the bulk phenomenon ?
we observe that on heating diffusion becomes faster.why does this happen?
why should we wear cotton clothes in summer?
How many free surfaces do solids, liquids and gases have and why?
ICE AT 0 DEGREE CELCIUS APPEARS COLDER TO THE MOUTH THAN WATER AT 0 DEGREE CELCIUS.WHY?
wat is the difference between viscosity and fluidity
How many hours does it take for the colour of ink to spread evenly throughout the water ? Pls answer ..... 2mrw is my exam .....
a gas exerts pressure on the walls of the container?why?how?
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