If someone solves this urgent I’ll give 100 points to u urgent
Answers
Answer:
1. The answer of question 1 is given in the attachment given.
2. (a) Gas molecules have either very weak bonds or no bonds at all, so they can move freely and quickly. Because of this not only a gas takes the shape of its container, it will also expand to completely fill the container.
(b) It is because gas particles have high kinetic energy so the travel a longer distance quickly and we can smell the lighted incense stick sitting at a distance.
(c) The particles of water are held together by the force of attraction. This is the reason that the diver is able to cut through water in the swimming pool.
(d) On a hot dry day, the amount of water vapour present in the air is less. Thus, water present inside the desert cooler evaporates more, thereby cooling the surroundings more. That is why a desert cooler cools better on a dry day.
(e) Naphthalene undergoes sublimation easily i.e. the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.
3. (a) 330 Kelvin in °C = 330-273 = 57° C
(b) 67°C in Kelvin = 67 + 273 = 340 Kelvin
4. (a) Rigidity is defined as the property exhibited by the solid to change its shape.
(b) Fluidity is the ability of a substance to flow easily.
(c) Compressibility is the capacity of something to be flattened or reduced in size by pressure.
(d) Kinetic energy is the energy which a body possesses by virtue of being in motion.
(e) Density is a measure of mass per unit of volume.
(f) Latent heat of fusion also known as enthalpy of fusion is the amount of heat required to change 1 g of a substance at the temperature of its melting point from the solid to the liquid state without changing temperature.
(g) Latent heat of vaporization is a physical property of a substance. When a material in liquid state is given energy it changes its phase from liquid to vapour without change in temperature, the energy absorbed in the process is called latent heat of vaporization.
(h) Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration.
5. The high compressibility of gas is the main reason for wide usage of oxygen gas in supplying cylinders to hospitals.
6. Answer is given in the attachment.
7. A cotton cloth absorbs sweat easily, while a nylon cloth does not. Evaporation of sweat absorbed by cotton cloth resulted in cooling effect to the body. The rate of evaporation also increases with the increase in surface area. Hence, Priyanshi who wore cotton clothes will feel more comfortable, while Ali does not.
8. Dry it under the fan when the speed of wind increases, the particles of water vapour from the shirt will move away with the wind, decreasing the amount of water vapour in the surroundings. It increases the rate of evaporation of water and the washed wet shirt dries more quickly.
9. Doctors advice to put strips of wet cloth on the forehead of a person suffering from high fever because the water evaporates and absorbs the heat from the body that causes cooling and lowering the body temperature.
Hope it helps.
Plz mark me the brainliest and follow.
Don't forget to rate stars.
Answer:
please mark me as brainlist
