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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
why do clothes take more time in drying on a rainy season
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?
which gas controls burning
carbondioxide or nitrogen
i want the answer now
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?
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
mention the property due to which when a hanging carpet is beaten with a stick the dust particles start coming out of it?
what are the characteristics of the particles of matter???
how does applying pressure help in liquefaction of a gas?
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
LPG
CNG
which of the following solutions will show tyndall effect?
starch solution , sodium chloride solution, tincture iodine , air
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???
what is the meaning of fixed volume
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
why do liquid have fixed volume but no fixed shape
how can show that particles matter have spaces between them?
how can we seperate mixture of iodine and ammonium chloride
Explain why:
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
what is the effect of pressure on physical state of matter? explain with an example of gas
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 does a wet khus-khus screen hung at the door keep the room cool?
examples of application of evaporation used in our daily life
What is the process of gas directly changing into a solid called?
do an activity to show that particles of matter are very small beyond our imagination
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
why do trees acquire more leaves during summer?
Define melting point of a solid.. At what temperature in the kelvin scale does ice melt? In the experiment to determine the melting of ice, why does the temperature not rise till all the ice melts even though heat is continuously supplied? What is this heat energy called?
1. Why should curd and sour substances not be kept in brass and coppervessels?
A solution of H2SO4 is labeled 40%. The density of the solution is 1.3gm/l.
give reason water at room temperature is a liquid
a compound is regarded as a pure substance while the mixture is not . assign the reason ?
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
why is heat energy needed to melt a solid what is this heat energy called
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.
Why does the level of water not change when salt is dissolved in water?
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 of the following substance in the gaseous state should be called a vapour?
1.oxygen 2.flourine 3.chlorine 4.iodine
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.
describe an activity to show that matter is composed of particles
how to download exam idea book for class9
what happens when a liquid is heated ?
What is the difference between Gas and Vapour?
Why is sodium light and iron hard in nature?
State 2 characteristics of matter demonstrated by:
(a) diffusion
(b) brownian motion
In which state of matter, diffusion is (a) fastest ,(b) slowest . explain?
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
What is dry ice?
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
change of gaseous state directly to solid state without going through liquid state is known as__________________.
4 substances that sublime
How will you justify that ice , water and steam are the three states of a substance and not different substances?
Why the boiling is known as the bulk phenomenon ?
Why does water boils at lower temperature at higher altitudes?
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?
Out of four gases CI2, CO2, CH4 ,N2 which of these gas would diffuse most rapidly and why
a gas exerts pressure on the walls of the container?why?how?
A substance has no no mass. can we regard it as matter or not??
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Syllabus
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
why do clothes take more time in drying on a rainy season
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?
which gas controls burning
carbondioxide or nitrogen
i want the answer now
why evaporation is called surface phenomenon?
Describe an activity to show that particles of matter are continuously moving.
related to boiling points of different substances and humidity and answer the
following questions.
Table A: Boiling points of different substances
Substance Boiling
point (?C)
Methanol 64.7
Ethanol 78.4
Nitric Acid 83
Water 100
Iodine 184.3
Table B: Humidity
Humidity
percentage
in three
situations
Humidity
(%)
Situation A >75
Situation B 50 ? 75
Situation C a. Refer Table B and find out in which situation a bowl of water will
evaporate away the fastest and in which situation the slowest.
b. A bowl of water and a bowl of ethanol are kept inside a room. Which
bowl will get empty first?
c. ?Evaporation is a surface phenomenon.? Explain.
d. Refer Table A and Table B and find in which situation out of the
following, the substance will evaporate the fastest.
(i) Methanol in situation C (ii) Iodine in situation A
(iii) Nitric acid in situation A (iv) Iodine in situation C
explain why,ice at 0 degree celcius more effective in cooling than water at the same temperature?
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
A. Subscript
B. Superscript
C. Supertext
D. Top text
8. A number of letter that appears little below the normal text is called :
A. Subscript
B. Superscript
C. Supertext
D. Subtext
9. Which feature starts a new line whenever a word or sentence reached a border
A. Text line
B. Superscript
C. Supertext
D. Subtext
10._________ allows you to Italicize the text
A. Bold
B. Italic
C. Subscript
D. Subtext
11._________ allows you to underline the text
A. Bold
B. Italic
C. Underline
D. Print
12._________ make your text darker than normal
A. Bold
B. Italic
C. Underline
D. Print
why do we see water droplets on the outer surface of a glass containing ice cold water
mention the property due to which when a hanging carpet is beaten with a stick the dust particles start coming out of it?
what are the characteristics of the particles of matter???
how does applying pressure help in liquefaction of a gas?
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
LPG
CNG
which of the following solutions will show tyndall effect?
starch solution , sodium chloride solution, tincture iodine , air
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???
what is the meaning of fixed volume
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
why do liquid have fixed volume but no fixed shape
how can show that particles matter have spaces between them?
how can we seperate mixture of iodine and ammonium chloride
Explain why:
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
what is the effect of pressure on physical state of matter? explain with an example of gas
why does the temperature of a substance remain constant during its melting point or boiling point ?
(a) It has a definite shape and a definite volume
(b) It has a definite shape but not definite volume
(c) It has a definite volume but not a definite shape
(d) It has neither a definite shape nor a definite volume
activity to show that gases are highly compressible than solids and liquids ?
Why does a wet khus-khus screen hung at the door keep the room cool?
examples of application of evaporation used in our daily life
What is the process of gas directly changing into a solid called?
do an activity to show that particles of matter are very small beyond our imagination
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
why do trees acquire more leaves during summer?
Define melting point of a solid.. At what temperature in the kelvin scale does ice melt? In the experiment to determine the melting of ice, why does the temperature not rise till all the ice melts even though heat is continuously supplied? What is this heat energy called?
1. Why should curd and sour substances not be kept in brass and copper
vessels?
A solution of H2SO4 is labeled 40%. The density of the solution is 1.3gm/l.
Is matter continuous or particulate in nature?
1) Ocean Water , Milk , Air , Nitrogen .
2) Rusting Of A Lock , Milk Turning Into Cheese , Mixing Salt Into Water , Baking A Cake .
3) Freezing Of Water , Cutting Paper , Burning Petrol , Stretching Of Spring .
give reason water at room temperature is a liquid
a compound is regarded as a pure substance while the mixture is not . assign the reason ?
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
why is heat energy needed to melt a solid what is this heat energy called
A wooden table should be called a solid give reason
1)Diffusion of solid into gas.
2)Diffusion of liquid into gas.
3)Diffusion of liquid into solid.
4)Diffusion of gas into liquid.
5)Diffusion of gas into solid.
(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.
Why does the level of water not change when salt is dissolved in water?
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
(1) Red (2) Mauve
(3) Blue (4) Green
is rubber band a solid.then why it changes its shape on streaching
What of the following substance in the gaseous state should be called a vapour?
1.oxygen 2.flourine 3.chlorine 4.iodine
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.
describe an activity to show that matter is composed of particles
how to download exam idea book for class9
what happens when a liquid is heated ?
What is the difference between Gas and Vapour?
Why is sodium light and iron hard in nature?
State 2 characteristics of matter demonstrated by:
(a) diffusion
(b) brownian motion
In which state of matter, diffusion is (a) fastest ,(b) slowest . explain?
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
What is dry ice?
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
change of gaseous state directly to solid state without going through liquid state is known as__________________.
4 substances that sublime
How will you justify that ice , water and steam are the three states of a substance and not different substances?
Why the boiling is known as the bulk phenomenon ?
Why does water boils at lower temperature at higher altitudes?
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?
Out of four gases CI2, CO2, CH4 ,N2 which of these gas would diffuse most rapidly and why
a gas exerts pressure on the walls of the container?why?how?
A substance has no no mass. can we regard it as matter or not??