ANSWER THESE
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?
10. Why does a summer rainstorm lower the temperature?
Answers
Answer:
1.solid , liquid and gases are the three states of matter. Ex:solid _ liquid _water gases_air
1.Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around.(Brick)
Liquid matter is made of more loosely packed particles. It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained.(water)
Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume. A gas can be compressed.(air)
2.Matter can change from one state to another if heated or cooled. If ice (a solid) is heated it changes to water (a liquid). This change is called MELTING. If water is heated, it changes to steam (a gas)
3.Methods of liquefaction
Methods of liquefactionIn general, gases can be liquefied by one of three 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, which causes the gas to lose energy and change to the liquid state; and (3) by making gas do work against its own internal forces, also causing it to lose energy and liquefy.
4.Sublimation, including melting, freezing, and evaporation, is a form of phase transition, or shift in a state of matter. A substance transforms from a solid to a gas by sublimation without ever going through a liquid phase. A common example of sublimation is the dry ice, heavy CO2.
5.The enthalpy of fusion of a substance, also known as (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
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 causes more severe burns.
Steam has more energy than boiling water. It possesses the additional latent heat of vaporization.
Steam has more energy than boiling water. 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.
Steam has more energy than boiling water. 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.Steam has more energy than boiling water. Therefore, burns produced by steam are more severe than those produced by boiling water.
8.answer in attachment
9.answer in attachment
answer in attachment
10.in attachment
