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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
during evaporation,particles of a liquid change to vapours only
A) from the surface
B) from the bulk
C) from both surface and bulk
D) neither from surface not from bulk
liquids have lower density than water but ice floats on water why
Differentiate between gas and vapour..
which of the following has a regular repeated molecular pattern and large number of free surfaces in three dimensional space
(A)solids and liquids
(B)liquids and gases
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
which of the following substance in the gaseous state should be called a vapour? and why
(c) carbon dioxide
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?
The ratio of specific charge of a proton and alpha particle is
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
The temperature remains constant during the boiling of water even though heat is supplied continously.Why?
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???
calculate the number of molecules in 4g of oxygen.
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
How to show the sublimation of ammonium chloride???
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 matter
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.
Define latent heat of fusion
how can show that particles matter have spaces between them?
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.
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
Boiling water can extinguish fire more quickly then ice or cold water. Why?
why does the temperature of a substance remain constant during its melting point or boiling point ?
Describe the process of sublimation and its applications.
activity to show that gases are highly compressible than solids and liquids ?
When 3.2 g of Sulphur is vaporized at 450oC and 723 mm pressure, the vapors occupy a volume of 780 ml. What is the molecular formula of sulphur vapours under these conditions? Calculate the vapor density also.
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
A sponge can change its shape by pressing but it is a solid. How is it possible ?
why do trees acquire more leaves during summer?
the particles of "X" are observed to undergo Brownian motion. what kind of substance is "X" ?
a) aqueous solution b) true solution
c) suspension d) collloidal solution
1. Why should curd and sour substances not be kept in brass and coppervessels?
why do we need pressure cooker to cook rice at hill stations
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.
is wind matter or non matter?
A wooden table should be called a solid give reason
what is the meaning of fixed volume
(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 of the following substance in the gaseous state should be called a vapour?
1.oxygen 2.flourine 3.chlorine 4.iodine
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
Find the rise in temperature of 1 Kg of water if 1000 J of heat is supplied to it._____________ .
name the solute and solvent of tincture of iodine
what type of clothes should we wear in summer why
Explain with the help of activity the particulate nature of matter.
why do clothes take more time in drying on a rainy season
how to download exam idea book for class9
describe an activity to show that matter is composed of particles
Why is sodium light and iron hard in nature?
What is the difference between Gas and Vapour?
State 2 characteristics of matter demonstrated by:
(b) brownian motion
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
4 substances that sublime
what are the advantages and disadvantages of evaporation
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
(a) draw a diagram to show the process of obtaining constituent gases from air
(b)which gas will condense first ?why?
Why the boiling is known as the bulk phenomenon ?
How will you justify that ice , water and steam are the three states of a substance and not different substances?
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?
how does applying pressure help in liquefaction of a gas?
how can we seperate mixture of iodine and ammonium chloride
a gas exerts pressure on the walls of the container?why?how?
What weight of oxygen gas will contain the same number of molecules as 56 g of nitrogen gas (O = 16 u; N = 14 u)
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