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10 examples of evaporation in daily life with explanations?
10 g of ice at -10 degree Celsius is added to 10 g of water at 85 degree Celsius. What is the final temperature and amount of ice left in the system?
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
liquids have lower density than water but ice floats on water why
What is the process of gas directly changing into a solid called?
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.
What is sublimation? Explain with help of an activity and a diagram.
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
Wet clothes dry up quickly in sun than in shade. Why?
why do we see water droplets on the outer surface of a glass containing ice cold water
a compound is regarded as a pure substance while the mixture is not . assign the reason ?
what are the characteristics of the particles of matter???
0.5g of salt is dissolved in 25g of water . Calculate the percentage amount of salt in that solution
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
what is the meaning of fixed volume
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.
Why does water boils at lower temperature at higher altitudes?
How to show the sublimation of ammonium chloride???
what happens when a liquid is heated ?
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 solution of H2SO4 is labeled 40%. The density of the solution is 1.3gm/l.
what is the difference between evaporation and cooling
(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 ?
Awater insoluble substance "X" on reacting with dilute H2SO4 released a colourless and odourless gas accompanied by a brisk effervescence. WHen the gas was passed through water, the solution turned blue litmus red. On bubbling the gas through lie water the soution became milky and milkyness disappeared when the gas was passed in excess. Identify the substance "X". Write its chemical equations of the reactions involved .
activity to show that gases are highly compressible than solids and liquids ?
how can we seperate mixture of iodine and ammonium chloride
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?
how does applying pressure help in liquefaction of a gas?
1. Why should curd and sour substances not be kept in brass and coppervessels?
calculate the number of molecules in 4g of oxygen.
give reason water at room temperature is a liquid
In which of the following conditions, the distance between the molecules ofhydrogen gas would increase?(i) Increasing pressure on hydrogen contained in a closed container(ii) Some hydrogen gas leaking out of the container(iii) Increasing the volume of the container of hydrogen gas(iv) Adding more hydrogen gas to the container without increasing thevolume of the container(a) (i) and (iii)(b) (i) and (iv)(c) (ii) and (iii)(d) (ii) and (iv)
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
A wooden table should be called a solid give reason
is wind matter or non matter?
(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 is sodium light and iron hard in nature?
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
What happen when we apply pressure to the particles of matter
is rubber band a solid.then why it changes its shape on streaching
why do we need pressure cooker to cook rice at hill stations
name the solute and solvent of tincture of iodine
why do chapati or puri swells up when cooked?????
what type of clothes should we wear in summer why
why do liquid have fixed volume but no fixed shape
Explain with the help of activity the particulate nature of matter.
Why does the level of water not change when salt is dissolved in water?
describe an activity to show that matter is composed of particles
how to download exam idea book for class9
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
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
4 substances that sublime
how long does it take for honey to dissolve in water ?whay does it take longer time to dissolve than the time taken by ink to dissolve in water ?
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 ?
Give reasons for d following: 1) Solids have a regular geometrical shape, where a liquid do not have definite shape.
2) Gases are compressible but liquids and solids are not.
3) Water is a compound not a mixture
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?
i.Does the rate of mixing changes with temperature? Explain why?
a gas exerts pressure on the walls of the container?why?how?
In which state of matter, diffusion is (a) fastest ,(b) slowest . explain?
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