What happens when a liquid is heated ?
A gas can exert pressure on the walls of the container. Assign reason.
. Convert the following temperature to Kelvin Scale (a) 100°C (b) -100 C
What is meant by density?
Give the characteristics of the particles of matter.
. Water droplets seen on the outer surface of a glass containing ice-cold water is due to _____________
. Change of gaseous state directly to solid state without going through liquid sate is called _____________________ .
. __________________ is a surface phenomenon.
Define Latent heat of vaporisation.
Explain why temperature remain constant during the change of state of any substance?
Define Sublimation with examples.
. Do we sweat more on a dry day or humid day ? Justify your reason.
Why do we see water droplets on the outer surface of a glass containing ice cold water?
. Convert the following temperature to the CELCIUS scale (a) 25K (b) 373K 7. List two properties that liquids have in common with solids.
Answers
◆ The moving particles in a gas collide with each other and also with the walls of the container and due to these collisions, Gases exert pressure on the walls of the container.
◆ a) 100℃ = 100+273 = 373 K
b) -100℃ = -100 + 273 = 173 K
◆ Density of a substance is the mass of the substance per unit its volume, or simply it is the ratio of the mass of the substance to the volume occupied by that substance.
◆ 1] The particles of matter are always in random motion.
2] The kinetic energy of the particles of matter increases with the increase in temperature.
3] The particles of matter may collide against each other, creating a particular amount of pressure on the colliding surface.
◆ Evaporation of water from the surface.
◆ Sublimation
◆ Evaporation
◆ Latent heat of vaporization is the amount of heat required by a substance to get vaporised, i.e., to get converted into gaseous state. For example, the latent heat of vaporization of water is 2268 J/g or 540 Cal/g.
◆ During the change of state of any substance, the average kinetic energy of its particles remain constant and thus the temperature also remains constant since it is directly proportional to the kinetic energy of those particles.
◆ Sublimation is a process in which a solid directly changes into vapour without changing into liquid on heating the solid substance.
Example :-
1)Iodine directly changes into vapour on heating.
2) Ammonium Chloride changes to vapour on heating.
3) Naphthalene also changes to vapour on heating.
◆ We sweat more on dry day because more the dryness of the atmosphere, more is the evaporation which results in sweating.
◆ Because of the evaporation from the surface of the glass containing ice cold water.
◆ a] 25 K = 25-273 = -248℃
b] 373 K = 373-273 = 100℃
◆
1] Both liquids and solids have definite shape.
2] Both liquids and solids consists of molecules.
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Answer:
◆ When a liquid is heated, it turns to its GASEOUS STATE (or converted into vapour).
◆ The moving particles in a gas collide with each other and also with the walls of the container and due to these collisions, Gases exert pressure on the walls of the container.
◆ a) 100℃ = 100+273 = 373 K
b) -100℃ = -100 + 273 = 173 K
◆ Density of a substance is the mass of the substance per unit its volume, or simply it is the ratio of the mass of the substance to the volume occupied by that substance.
◆ 1] The particles of matter are always in random motion.
2] The kinetic energy of the particles of matter increases with the increase in temperature.
3] The particles of matter may collide against each other, creating a particular amount of pressure on the colliding surface.
◆ Evaporation of water from the surface.
◆ Sublimation
◆ Evaporation
◆ Latent heat of vaporization is the amount of heat required by a substance to get vaporised, i.e., to get converted into gaseous state. For example, the latent heat of vaporization of water is 2268 J/g or 540 Cal/g.
◆ During the change of state of any substance, the average kinetic energy of its particles remain constant and thus the temperature also remains constant since it is directly proportional to the kinetic energy of those particles.
◆ Sublimation is a process in which a solid directly changes into vapour without changing into liquid on heating the solid substance.
Example :-
1)Iodine directly changes into vapour on heating.
2) Ammonium Chloride changes to vapour on heating.
3) Naphthalene also changes to vapour on heating.
◆ We sweat more on dry day because more the dryness of the atmosphere, more is the evaporation which results in sweating.
◆ Because of the evaporation from the surface of the glass containing ice cold water.
◆ a] 25 K = 25-273 = -248℃
b] 373 K = 373-273 = 100℃
◆
1] Both liquids and solids have definite shape.
2] Both liquids and solids consists of molecules.
IF YOU LIKE MY ANSWER, PLEASE MARK ME AS BRAINLIEST MATE...............!!!!!!!!
FOLLOW ME FOR MORE SOLUTIONS OF YOUR DOUBTS..........!!!!!!!!
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Explanation: