13.
WE
umeme w e stales of maller with examples.
12.
Give one similarity between a liquid and a gas and one dissimilarity.
Give one similarity betu
What property of gas is utilized when natural gas is supplied for vehicles.
What are 'intermolecular forces'? How are these related to the three states of matter?
In liquid, inter molecular force is weak to give definite shape.
15. Separate the following substances in groups of high and low intermolecular force: Ice, sulphur
vapour, nitrogen, sugar, copper, air, salt, plastic.
Why are gases compressible but liquids not?
Compare the process of boiling and vaporization.
Why evaporation is called surface phenomenon?
19. List two processes from which it may be concluded that the particles of a gas move
continuously.
20. At what temperature does solid ice and liquid water co-exist together?
21. A substance x was highly compressible and could easily be liquefied. it could also take the
shape of the container. Predict the nature of the substance
22. What is the state of water at 100 degree Celsius, zero degree Celsius and 4 degree Celsius?
What do you mean by Latent heat of Fusion?
24. Explain why ice has lower density than water?
25. How is pressure developed in a container full of a gas?
Answers
Answer:
12: both liquids and gases are known as fluids and do not have any fixed shape
13 : molecular forces refer to the force applied by each atom of an substance on another atom of the substance. the strength of intermolecular forces reduces from solid to gas the intermolecular forces in a substance is less than the distance between the molecules will be higher hence the substance will have a higher kinetic energy..... gases are very less intermolecular forces that is why the molecules of gas are placed very far away from each other and the kinetic energy of gases a much higher than that of solid
substances with high intermolecular forces
ice sulphur sugar copper salt and plastic these all are solids hence they have a high intermolecular force
substances with low intermolecular forces
vapour nitrogen air
There is no space between the individual particles, so they cannot pack together. The kinetic-molecular theory explains why gases are more compressible than either liquids or solids. Gases are compressible because most of the volume of a gas is composed of the large amounts of empty space between the gas particles.
Evaporation is called a surface phenomenon because it relies on the exchange of energy from the air molecules and the surface molecules of the liquid. When air molecules collide with the surface molecules of the liquid, they can impart energy that the surface molecules can use to undergo the phase change.
solid and liquid water caused when liquid water is converted to solid ice or ice melting into liquid which is equal to 32 degree fahrenheit or 0 degree Celsius
the substance is a gas
state of water at hundred degree celsius is liquid and gas.... at zero degree celsius it is solid and liquid. ... 4 degree Celsius it is liquid
(latent) heat of fusion is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.
when water is freezing at approximately 4 degree Celsius it expands a bit and the volume during this the air molecules inside the water gets trapped and hence frozen ice has a molecules inside them which makes the density of the ice less than water
there high pressure inside a container because of the high kinetic energy of the molecules the kinetic energy of the molecules result in the rapid colition of the molecules against the container wall
hope this will help