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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
what happens when a liquid is heated ?
liquids have lower density than water but ice floats on water why
Why does the level of water not change when salt is dissolved in water?
Differentiate between gas and vapour..
on heating why does diffusion become faster? (Detailed answer)
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.
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
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?
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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.
What is the process of gas directly changing into a solid called?
How to show the sublimation of ammonium chloride???
In which state of matter, diffusion is (a) fastest ,(b) slowest . explain?
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.
change of gaseous state directly to solid state without going through liquid state is known as__________________.
Define latent heat of fusion
how can show that particles matter have spaces between them?
why is heat energy needed to melt a solid what is this heat energy called
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
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
why does the temperature of a substance remain constant during its melting point or boiling point ?
what is the effect of pressure on physical state of matter? explain with an example of gas
activity to show that gases are highly compressible than solids and liquids ?
A substance has no no mass. can we regard it as matter or not??
examples of application of evaporation used in our daily life
how does applying pressure help in liquefaction of a gas?
do an activity to show that particles of matter are very small beyond our imagination
How matter is continuous like a block of wood
why do trees acquire more leaves during summer?
name the temperature at which the solid and liquid states of substance can exist together
1. Why should curd and sour substances not be kept in brass and coppervessels?
The property to flow is unique to fluids. Which one of the followingstatements is correct?(a) Only gases behave like fluids(b) Gases and solids behave like fluids(c) Gases and liquids behave like fluids(d) Only liquids and fluids
what is the meaning of fixed volume
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 substance in the gaseous state should be called a vapour? and why
(c) carbon dioxide
A wooden table should be called a solid give reason
How many free surfaces do solids, liquids and gases have and why?
(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.
Particles in steam at 100 C have more energy than water at the same temperature. Why?
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 do we mean by liquids do not fill their container completely ? And
gasss fill their container completely?
name the solute and solvent of tincture of iodine
Although sugar is a solid it takes the shape of the container in which it's kept. Why?
what type of clothes should we wear in summer why
Explain with the help of activity the particulate nature of matter.
We cannot cut the running stream of water from tap by our fingers. What property of matter does it Show ?
describe an activity to show that matter is composed of particles
wat is the difference between viscosity and fluidity
how to download exam idea book for class9
What is the difference between Gas and Vapour?
why is a sponge compressible even though it is a solid???
State 2 characteristics of matter demonstrated by:
(b) brownian motion
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
A crystal of copper sulphate dissolve quickly in hot water than in cold water ?
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
is wind matter or non matter?
4 substances that sublime
arrange the following substances in increasing order of force of attraction between the particles.(a)milk (b)salt (c)oxygen
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 ?
Why is sodium light and iron hard in nature?
why should we wear cotton clothes in summer?
what do you mean by negligible compressibility ?
ICE AT 0 DEGREE CELCIUS APPEARS COLDER TO THE MOUTH THAN WATER AT 0 DEGREE CELCIUS.WHY?
why do the states of matter differ ?
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 ?
a gas exerts pressure on the walls of the container?why?how?
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