Select Board & Class
10 examples of evaporation in daily life with explanations?
The ratio of specific charge of a proton and alpha particle is
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 the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
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..
The temperature remains constant during the boiling of water even though heat is supplied continously.Why?
why evaporation is called surface phenomenon?
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
explain why,ice at 0 degree celcius more effective in cooling than water at the same temperature?
Describe an activity to show that particles of matter are continuously moving.
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
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
why do we see water droplets on the outer surface of a glass containing ice cold water
Is SMELL a matter or not.
if yes,explain how?
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
LPG
CNG
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.
Describe the process of sublimation and its applications.
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
is wind matter or non matter?
how can show that particles matter have spaces between them?
why do we need pressure cooker to cook rice at hill stations
Explain 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 ?
activity to show that gases are highly compressible than solids and liquids ?
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
which of the following solutions will show tyndall effect?
starch solution , sodium chloride solution, tincture iodine , air
why do trees acquire more leaves during summer?
calculate the number of molecules in 4g of oxygen.
1. Why should curd and sour substances not be kept in brass and coppervessels?
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.
give reason water at room temperature is a liquid
arrange the gases present in the air in th increasing order of their boiling points.Which gas forms liquid first as the air is cooled?
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
what are the advantages and disadvantages of evaporation
a mixture consists of an insoluble substance X and a soluble substance Y. the mixture is dissolved in water and filtered.the filtrate so collected is?
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.
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 is matter
name the solute and solvent of tincture of iodine
which organelle is called 'digestive bag'?why is it so called?
what type of clothes should we wear in summer why
Explain with the help of activity the particulate nature of matter.
(d) petrol alcohol kerosene oil Water
how to download exam idea book for class9
describe an activity to show that matter is composed of particles
What is the difference between Gas and Vapour?
(a) draw a diagram to show the process of obtaining constituent gases from air
(b)which gas will condense first ?why?
State 2 characteristics of matter demonstrated by:
(a) diffusion
(b) brownian motion
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
4 substances that sublime
which of the following substance in the gaseous state should be called a vapour? and why
(a) heliun
(b) nitrogen
(c) carbon dioxide
(d) sulphur
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
Why the boiling is known as the bulk phenomenon ?
sugar does not dissolve in cold milk. explain why? how can you ,make it dissolves in milk
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?
ice is a solid at 0 degrees celsius but water is a liquid at room temperature. 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?
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Syllabus
10 examples of evaporation in daily life with explanations?
The ratio of specific charge of a proton and alpha particle is
2:11:21:41:1why 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 the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
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..
The temperature remains constant during the boiling of water even though heat is supplied continously.Why?
why evaporation is called surface phenomenon?
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
explain why,ice at 0 degree celcius more effective in cooling than water at the same temperature?
Describe an activity to show that particles of matter are continuously moving.
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
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
why do we see water droplets on the outer surface of a glass containing ice cold water
Is SMELL a matter or not.
if yes,explain how?
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
LPG
CNG
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.
Describe the process of sublimation and its applications.
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
is wind matter or non matter?
how can show that particles matter have spaces between them?
why do we need pressure cooker to cook rice at hill stations
Explain why:
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
69. The normal boiling point of a liquid is 140oC. What will be the vapour pressure of the liquid at 140oC, in atm unit ?
why does the temperature of a substance remain constant during its melting point or boiling point ?
A flask containing SO2 gas was weighed at a particular temperature and pressure . The flask was then flushed and filled with oxygen gas at the same temperature and pressure.
The weight of SO2 in the flask Will be about
(A) Same as that Of oxygen
(B) One fourth that of oxygen
(C) Four time that of oxygen
(D) Twice that of oxygen
activity to show that gases are highly compressible than solids and liquids ?
examples of application of evaporation used in our daily life
in the figure. If the lid separating the two jars is removed, what
constituent(s) will exist in the gas jar A after a few minutes and why?
do an activity to show that particles of matter are very small beyond our imagination
which of the following solutions will show tyndall effect?
starch solution , sodium chloride solution, tincture iodine , air
why do trees acquire more leaves during summer?
calculate the number of molecules in 4g of oxygen.
1. Why should curd and sour substances not be kept in brass and copper
vessels?
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.
give reason water at room temperature is a liquid
arrange the gases present in the air in th increasing order of their boiling points.Which gas forms liquid first as the air is cooled?
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
what are the advantages and disadvantages of evaporation
Is matter continuous or particulate in nature?
a mixture consists of an insoluble substance X and a soluble substance Y. the mixture is dissolved in water and filtered.the filtrate so collected is?
A wooden table should be called a solid give reason
(a) Camphor
(b) Ammonium chloride
(c) Bromine
(d) Iodine
(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.
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
(a)Sulphur dissolves to form colourless solution and the iron filings settle down.
(b)Some brown gas is evolved.
(c)Yellow solution is formed and iron filings settle down.
(d)After some time, carbon disulphide, sulphur and iron filings form three separate layers in the test tube.
is rubber band a solid.then why it changes its shape on streaching
what is matter
name the solute and solvent of tincture of iodine
which organelle is called 'digestive bag'?why is it so called?
what type of clothes should we wear in summer why
Explain with the help of activity the particulate nature of matter.
(d) petrol alcohol kerosene oil Water
how to download exam idea book for class9
Intermolecular force of attraction is maximum in---- a) Solids, b) Liquids, c)Gases, d) Plasma particles.
describe an activity to show that matter is composed of particles
What is the difference between Gas and Vapour?
(a) draw a diagram to show the process of obtaining constituent gases from air
(b)which gas will condense first ?why?
State 2 characteristics of matter demonstrated by:
(a) diffusion
(b) brownian motion
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
4 substances that sublime
which of the following substance in the gaseous state should be called a vapour? and why
(a) heliun
(b) nitrogen
(c) carbon dioxide
(d) sulphur
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
NaCl in Sulphur Dioxide
Copper in Silver
Salt in petrol
Mud in water
Why the boiling is known as the bulk phenomenon ?
sugar does not dissolve in cold milk. explain why? how can you ,make it dissolves in milk
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?
ice is a solid at 0 degrees celsius but water is a liquid at room temperature. 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?