Give very short answer for the following questions:
1. Name the three states of matter. Give one example of each.
2. What are the two ways in which the physical state of matter can be changed?
3. Explain how gases can be liquefied?
4. What is sublimation? Give examples.
5. Define latent heat of fusion.
6. Define latent heat of vaporization.
7. What produces more severe burns, boiling water or steam?
8. A drop of dettol got evenly distributed in water. How?
9. Liquid nitrogen is used as a commercial refrigerant to flash freeze foods. Nitrogen boils at -196°C. What is this temperature on the Kelvin temperature scale?
10. What property or properties of gases can you point to support the assumption that most of the volume in a gas is empty space?
Answers
Answer:
1 - States of Matter: Solid, Liquid, Gas
ex of solid- ice
ex of liquid- water
ex of gas-water vapour
2- The two main way to change the physical state are by heating and cooling.
3- In general, gases can be liquefied by one of three general methods:(1) by compressing the gas at temperatures less than its critical temperature; (2) by making the gas do some kind of work against an external force, causing the gas to lose energy and change to the liquid state; and (3) by using the Joule-Thomson effect
4-Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.
example - Dry ice
5- The enthalpy of fusion of a substance, also known as 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.
6- The enthalpy of vaporization, also known as the heat of vaporization or heat of evaporation, is the amount of energy that must be added to a liquid substance, to transform a quantity of that substance into a gas. The enthalpy of vaporization is a function of the pressure at which that transformation takes place.
7-Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.
8- Yes, it is true that a drop of dettol gets evenly distributed when added to water. The reason behind this is, because there is enough of space between the particles of matter in water. This is also known as the homogeneous mixture which is distributed in the water.
10- Gases have lower density than other states of matter, such as solid and liquid. There is a great deal of empty space between particles, which have a lot of kinetic energy.
i could not understand the ninth question so
i dont give the answer
hope the answer i give to you was helpfull
Hey mate
Here is your answer :-
Ans1:-Matter is something which has mass and occupies space. There are three states of matter namely solid, liquid and gas. Solid state : In this state, the molecules are arranged in regular and repeating pattern.
Ans2:-The two main way to change the physical state are by heating and cooling. Explanation: The physical state of matter can be changed from solid to liquid or gas by heating.]
Ans3:-In general, gases can be liquefied by one of three general methods:(1) by compressing the gas at temperatures less than its critical temperature; (2) by making the gas do some kind of work against an external force, causing the gas to lose energy and change to the liquid state; and (3) by using the Joule-Thomson effect.
Ans4:-Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation. Through sublimation, a substance changes from a solid to a gas without ever passing through a liquid phase. Dry ice, solid CO2, provides a common example of sublimation.
Ans5:-The heat of fusion, also known as the latent heat of fusion, is a category of latent heat describing the energy for the phase change between a liquid and a solid to occur without a change in temperature.
Ans6:-The enthalpy of vaporization, also known as the heat of vaporization or heat of evaporation, is the amount of energy that must be added to a liquid substance, to transform a quantity of that substance into a gas. The enthalpy of vaporization is a function of the pressure at which that transformation takes place.
Ans7:-It possesses the additional latent heat of vaporization. So, when steam falls on skin and condenses to produce water it gives out 22.5 x 105 J/kg more heat than boiling water at the same temperature. Therefore, burns produced by steam are more severe than those produced by boiling water.
Ans8:-Yes, it is true that a drop of dettol gets evenly distributed when added to water. The reason behind this is, because there is enough of space between the particles of matter in water. This is also known as the homogeneous mixture which is distributed in the water
Ans9:-Under normal atmospheric pressure, nitrogen exists as a liquid between the temperatures of -210°C and -196°C which equals -346°F and -320.44°F. Below -210°C, nitrogen freezes and becomes a solid. Above -196°C, nitrogen boils and becomes a gas.
Ans10:-Gases have lower density than other states of matter, such as solid and liquid. There is a great deal of empty space between particles, which have a lot of kinetic energy.
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