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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
is wind matter or non matter?
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?
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
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?
which of the following solutions will show tyndall effect?
starch solution , sodium chloride solution, tincture iodine , air
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
what are the characteristics of the particles of matter???
why do the states of matter differ ?
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
iron powder and sulphur powder were mixed together and divided into two parts A and B.When part A was heated strongly over a burner,then a substance C was formed.Then part B was not heated at all.When dilute HCl was added to substance C,then gas D was evolved and when dilute HCl was added to part B then gas E was evolved
1)what type of substance is B?
2)what type of substance is C?
3)name the gas D and E?
4)state one characterstic property of gas D?
5)write one test to identify gas E?
PLEASE PLEASE ANSWER FAST,....IMPORTANT ....AND URGENT TOO
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???
the melting point of a substance is below the room temprature. predict its physical state.
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.
is it possible to liquify atmospheric gases? if yes suggest a method?
Define latent heat of fusion
A substance has no no mass. can we regard it as matter or not??
how can show that particles matter have spaces between them?
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
why do liquid have fixed volume but no fixed shape
why does the temperature of a substance remain constant during its melting point or boiling point ?
Asolution contain 16g of urea in 120g of solution. What is mass by mass percentage of solution .
activity to show that gases are highly compressible than solids and liquids ?
which of the following substance in the gaseous state should be called a vapour? and why
(c) carbon dioxide
examples of application of evaporation used in our daily life
what happens when a liquid is heated ?
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?
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 of the following substance in the gaseous state should be called a vapour?
1.oxygen 2.flourine 3.chlorine 4.iodine
give reason water at room temperature is a liquid
Why does the level of water not change when salt is dissolved in water?
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
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
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.
The interparticle forces are the strongest in -
2) Ethyl Alcohol
3) Carbon dioxide
4) Sodium Bromide
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
Choose the correct one --
When water boils , its temperature :
Also give reason for the chosen answer.
name the solute and solvent of tincture of iodine
A crystal of copper sulphate dissolve quickly in hot water than in cold water ?
what type of clothes should we wear in summer why
Write the name of process when following change takes place (i) Molten iron is allowed to cool. (ii) Ethyl alcohol is heated over 76 ˚C. (iii) Wet clothes are spread out
Explain with the help of activity the particulate nature of matter.
describe an activity to show that matter is composed of particles
how to download exam idea book for class9
what is the effect of pressure on physical state of matter? explain with an example of gas
What is the difference between Gas and Vapour?
why is heat energy needed to melt a solid what is this heat energy called
State 2 characteristics of matter demonstrated by:
(b) brownian motion
why do clothes take more time in drying on a rainy season
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
Particles in steam at 100 C have more energy than water at the same temperature. Why?
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
(a)When common salt is added to water, it dissolves. Name the property which is exhibited by this activity. (b)The melting points of solids (A), (B), (C) and (D) are 50C, 250C, 110C and 160C respectively. Name the solid which has strongest inter particle forces of attraction. (c)Suppose you are going out on a hot summer day. Should you wear a cotton T-shirt or nylon T-shirt? Give reason also. (d)Which is more volatile: Liquid A (Boiling point 85C) or water (Boiling point 100C)?
4 substances that sublime
How will you justify that ice , water and steam are the three states of a substance and not different substances?
what is the meaning of fixed volume
Why the boiling is known as the bulk phenomenon ?
Name the non- metal used in skin ointments
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?
Ordinary water boils at 100 degree c.can it be made to boil at 95 degree c. or 105 degree c. ?
how does applying pressure help in liquefaction of a gas?
Is burning of wood sublimation ? Do all solids get converted to liquid upon heating ?
a gas exerts pressure on the walls of the container?why?how?
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