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Class 9 Chemistry Chapter 5 Notes
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9th Class Chemistry Chapter 5 Physical States of Matter Short Questions Notes
- Gases diffuse very rapidly. Diffusion is the mixing up of a gas throughout a space or other gases.
- Effusion is the escaping of a gas molecule through a fine hole into an evacuated space.
- Gases exert pressure. The SI unit of pressure is Nm which is also called Pascal.
- Standard atmospheric pressure is the pressure exerted by a mercury column of 760 mm height at sea level, it is equivalent to 1 atmosphere.
- Gases are highly mobile and they can be compressed.
- Gases are 1000 times lighter than liquids or solids hence their density is measured in g dm.
- Boyle’s law states that the volume of a given mass of a gas is inversely proportional to the pressure at a constant temperature.
- Charles’ Law states that the volume of a given mass of a gas is directly proportional to the absolute temperature at a constant pressure.
- Absolute zero is the temperature at which an ideal gas would have zero volume, it is 273.15 °C.
- The conversion of a liquid into vapors at all temperatures is called evaporation. It is a cooling process.
- Evaporation depends upon surface area, temperature, and intermolecular forces.
- The vapor pressure of a liquid is defined as the pressure exerted by the vapors when liquid and vapor states are in dynamic equilibrium with each other.
- The boiling point is the temperature at which the vapor pressure of a liquid becomes equal to the atmospheric pressure or any external pressure.
- The boiling point depends upon the nature of the liquid, intermolecular forces, and external pressure.
- The freezing point of a liquid is the temperature at which the vapor pressure of the liquid phase is equal to the vapor pressure of the solid phase. At this temperature liquid and solid coexist in dynamic equilibrium with one another.
- The melting point of a solid is the temperature at which the solid when heated melts and coexist in dynamic equilibrium with liquid.
- Solids are rigid and denser than liquids.
- Solids are classified as amorphous and crystalline.
- Amorphous solids are shapeless and do not have a sharp melting point.
- Crystalline solids have definite three-dimensional patterns of arrangement of particles. They have sharp melting points.
- The existence of a solid in different physical forms is called allotropy.
- What is diffusion, explain with an example.
- Define standard atmospheric pressure. What are its units? How it is related to Pascal?
- Why are the densities of gases lower than that of liquids?
- What do you mean by evaporation how it is affected by surface area?
- Define the term allotropy with examples.
- In which form sulphur exists at 100 °C.
- What is the relationship between evaporation and the boiling point of a liquid?
Chemistry Chapter 5 Short Questions PDF Download
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