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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?
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
why does steam cause more severe burns than boiling water
The interparticle forces are the strongest in -
2) Ethyl Alcohol
3) Carbon dioxide
4) Sodium Bromide
liquids have lower density than water but ice floats on water why
Differentiate between gas and vapour..
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
A substance has no no mass. can we regard it as matter or not??
why evaporation is called surface phenomenon?
Describe an activity to show that particles of matter are continuously moving.
change of gaseous state directly to solid state without going through liquid state is known as__________________.
explain why,ice at 0 degree celcius more effective in cooling than water at the same temperature?
name the temperature at which the solid and liquid states of substance can exist together
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
is it possible to liquify atmospheric gases? if yes suggest a method?
what are the characteristics of the particles of matter???
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
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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 of the following substance in the gaseous state should be called a vapour?
1.oxygen 2.flourine 3.chlorine 4.iodine
How to show the sublimation of ammonium chloride???
why does the smell of the lighted incense stick reaches several metres away?
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.
what is the effect of pressure on physical state of matter? explain with an example of gas
Define latent heat of fusion
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
how can show that particles matter have spaces between them?
which of the following substance in the gaseous state should be called a vapour? and why
(c) carbon dioxide
Equal volume of ethanol are kept separately in a test tube, in a china dish, in a water glass and in a conical flask. In which container alcohol evaporates faster?why
Diethyl ether evaporates faster than ethyl alcohol because of which factor?why
Statement A: The temperature of the liquid becomes constant once it starts boiling. Statement B: Pressure of air at sea level is 70cm. Which of the two statements is true?why
The melting points of two solids [A] and [B] are 300K and 350K respectively. Which has more interparticles forces? why
(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 ?
Choose the correct one --
When water boils , its temperature :
Also give reason for the chosen answer.
activity to show that gases are highly compressible than solids and liquids ?
Asolution contain 16g of urea in 120g of solution. What is mass by mass percentage of solution .
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?
Name the property of gases due to which it is possibleto fill CNG in cylinders for using as fuel in cars?
1. Why should curd and sour substances not be kept in brass and coppervessels?
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
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.
Wet clothes dry up quickly in sun than in shade. 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
name the solute and solvent of tincture of iodine
how does applying pressure help in liquefaction of a gas?
what type of clothes should we wear in summer why
WHICH ON THE FOLLOWING STATEMENT IS INCORRECT
(a)cooling is produced during melting
(b)temperature changes steadily on heating
(c)melting point of ice 0degree
(d)once melting starts,the temperature stays at 0 degree celcius until all the ice has melted
Explain with the help of activity the particulate nature of matter.
describe an activity to show that matter is composed of particles
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 is the difference between Gas and Vapour?
State 2 characteristics of matter demonstrated by:
(b) brownian motion
Tarini Fancy Inc. is planning to connect all computers in their Office Building spread over 50 Metres of ares. Suggest the most economical cable type having high data transfer speed which can be used to connect these computers. Which type of Network (out of WAN. LAN and MAN ) will be formed by connecting these computers?
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
Why do solids generally lack the property of diffusion?
4 substances that sublime
How will you justify that ice , water and steam are the three states of a substance and not different substances?
In an oil lamp draw the arrangement of particles of gas and liquid when lamp is burning
Why the boiling is known as the 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?
ammonia and hydrogen chloride gases are released from the two opposite corners in a room. which gas will reach first to a person sitting in the center of the room. Please give me the explanation too.
a gas exerts pressure on the walls of the container?why?how?
what happens when a liquid is heated ?
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