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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?
A crystal of copper sulphate dissolve quickly in hot water than in cold water ?
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 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?
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
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
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
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.
is wind matter or non matter?
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.
why do liquid have fixed volume but no fixed shape
Define latent heat of fusion
how can show that particles matter have spaces between them?
A substance has no no mass. can we regard it as matter or not??
(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 ?
activity to show that gases are highly compressible than solids and liquids ?
why do clothes take more time in drying on a rainy season
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?
1. Why should curd and sour substances not be kept in brass and coppervessels?
A wet khus khus screen hung at the door keeps the room cool. why? THis is the question in my unit test . I have written answer as " A wet khus khus keeps the room cool if hung at the door because the water particles in khus khus gains energy from the surrounding to evoporate and thus leaves the surrounding cool." I got 50% marks for the answer. What should be the answer so that i get full marks.
which of the following substance in the gaseous state should be called a vapour? and why
(c) carbon dioxide
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.
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
A wooden table should be called a solid give reason
Identify the following as mixtures or compounds : (i) blood (ii) table salt (iii) sugar (iv) brass
(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.
which gas controls burning
carbondioxide or nitrogen
i want the answer now
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
name and describe method used for separating the components present in a sample of ink. list it's any two applications.
is rubber band a solid.then why it changes its shape on streaching
Amongst evaporation and condensation which process is moreindisciplined? Justify your answer.
name the solute and solvent of tincture of iodine
is it possible to liquify atmospheric gases? if yes suggest a method?
what type of clothes should we wear in summer why
which one is the fast process?
(d) none of these
Explain with the help of activity the particulate nature of matter.
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?
describe an activity to show that matter is composed of particles
What is the boiling point of water in hill stations?
a)100C b)<100C c)>100C d)either >100C or <100C
I have written <100C.
Is it correct ?
<100C means less than 100C or greater than 100C?
Plz give me the correct answer
how to download exam idea book for class9
What is the difference between Gas and Vapour?
Choose the correct one --
When water boils , its temperature :
Also give reason for the chosen answer.
State 2 characteristics of matter demonstrated by:
(b) brownian motion
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
How many free surfaces do solids, liquids and gases have and why?
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
why do the states of matter differ ?
4 substances that sublime
How will you justify that ice , water and steam are the three states of a substance and not different substances?
Explain an activity to show that gases can diffuse.
Why the boiling is known as the bulk phenomenon ?
with the help of a neat diagram explain the difference in arrangements of particlesin solids,liquids and gases.
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?
why is heat energy needed to melt a solid what is this heat energy called
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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