Class 9th Chemistry Unit 5 Physical States of Matter

chemistry 9th notes Chapter No 5

1. Example of amorphous solid is:


2. Which one is crystalline solid?


3. The ease of flow of liquid depends upon the strength of:


4. How many times does hydrogen gas diffuse faster than oxygen gas?


5. One atmospheric pressure is equal to how many Pascal:


6. Density of oxygen gas at 0 ⁰C:


7. The S.I unit of pressure is:     


8. Solid particles possess which one of the following motions?


9. The vapour pressure of a liquid increases with the:


10. The gaseous law that give the relationship between the volume and pressure is:


11. The boiling point of sodium chloride is:


12. The boiling point of alcohol is:


13. Density of iron is:      


14. Rate of diffusion depends upon the:


15. Which state of matter has fixed shape and volume?  


16. How many times liquids are denser than gases?


17. The simplest form of matter is:


18. The expression V ∞ T is the expression for _______ law.      


19. Pressure is a significant property of:


20. The boiling point of water is:


21. At freezing point which one of the following coexists in dynamic equilibrium:


22. In the evaporation process, liquid molecules which leave the surface of the liquid have:


23. Freezing point of ethyl alcohol is:


24. Which one of the following gas diffuses fastest?


25. In hypertension, blood pressure is greater than:


26. On which factor does evaporation depend?


27. What must remain constant if Charles’ law is to be applied to a given sample of a gas?


28. How many states of matter exist?


29. Which one is used to measure atmospheric pressure?


30. When the pressure of gas is increased from 1atm to 2atm, the volume of the gas reduces from 2 dm³ to:


31. Allotropes of oxygen are:    


32. The process of moving of molecules from the vapour phase back into the liquid phase is called:


33. Body temperature is measured in:


34. Which one of the following is not amorphous?


35. The pressure exerted by the vapours of the liquid in equilibrium with the liquid at a given temperature is called:


36. Freezing point of water is:


37. In which state matter does not have definite shape and volume?


38. The temperature at which two allotropic forms co-exist is called:   


39. Absolute temperature scale was introduced by:


40. Vapour pressure of liquid depends upon the factors:


41. At 0 ⁰C the vapour pressure of diethyl ether is:


42. Density of oxygen gas at 20 ⁰C:


43. Gases are the lightest form of matter and their densities are expressed in terms of:               


44. Atomic radius of carbon in pm is:


45. Boyle proposed his law in:


46. At 0 ⁰C the vapour pressure of ethyl alcohol is:


47. Density of water is:


48. A tyre gets punctured is the example of:


49. Density of gold is:      


50. Density of solids is expressed in:       


51. Density of aluminum is:         


52. Liquids can be poured from one vessel to another due to:


53. At which temperature the volume of gas will be equal to zero?


54. Which one of the following does not affect the boiling point?


55. Which one is used to measure pressure in the laboratory?


56. In Charle’s Law k = ?


57. The mathematical expression that describes Boyle’s law is:


58. According to Charles’ law, volume and temperature vary:


59. When the pressure of gas is increased from 2atm to 4atm, the volume of the gas reduces from 1 dm³ to:


60. Vapour pressure of the liquid increases with increase in:


61. The Kelvin temperature scale was first suggested by the British scientist:


62. The temperature at which the volume of a gas theoretically becomes zero is:


63. Blood pressure of a healthy / normal person is:


64. 1 atm pressure is equal to:     


65. When the pressure of gas is increased from 2atm to 6atm, the volume of the gas reduces from 1dm³ to:


66. On what factors does the boiling point depend upon?


67. The boiling point of acetic acid is:


68. Density of liquid is expressed in:


69. When the pressure of gas is increased from 2atm to 8atm, the volume of the gas reduces from 1dm³ to:


70. The process of escape of molecules spontaneously from the surface of a liquid is called:


71. The volume of a given mass of a gas is inversely proportional to pressure when temperature is kept constant, this is called _______ law.


72. The constant factor in Boyle’s law is:


Short Questions


A gas occupies a volume of 800cm³ at 1 atm. What will be its pressure in mm of Hg, when it is allowed to expand up to 1200cm³?
Can you cool a gas by increasing its volume?
Convert 450 Kelvin into Celsius scale.
Convert 73 Celsius into Kelvin scale.
Define amorphous solids. Give examples.
Define boiling point.
Define Boyle’s law.
Define Charles’s law. Also write its mathematical representation.
Define crystalline solids. Give examples.
Define Effusion. On what factor does it depend?
Define evaporation.
Define freezing point
Define melting point. Describe melting of solids.
Define Pressure. Write down its SI unit.
Define standard atmospheric pressure. What are its units? How is it related to Pascal?
Define the term allotropy with examples.
Define transition temperature. Give examples.
Define vapour pressure.
Describe gaseous state of matter.
Describe the mobility of gas molecules.
Does Kelvin scale show a negative temperature?
Enlist the factors on which boiling point depends.
Enlist the factors on which vapour pressure depends.
Enlist the factors that affect evaporation.
Explain density of solid.
Explain evaporation causes cooling.
Explain the rigidity of solid.
Give the limitations of Arrhenius concept.
Give the mathematical expression for Charles’s law of gases.
Give the second statement of Boyle’s law.
How is evaporation affected by intermolecular forces of substance?
How is evaporation affected by surface area?
How the sizes of molecule affect vapour pressure?
How the temperature affect vapour pressure?
In which form does sulphur exist at 100 ⁰C?
Is the Boyle’s law applicable to liquids?
Is the Boyle’s law valid at very high temperature?
State Boyle’s law of gases.
State Charles law of gases and give its mathematical representation.
State whether allotropy is shown by elements or compounds or both?
Under which conditions is Boyle’s law applicable?
What are the factors affecting evaporation?
What do you mean by condensation?
What do you mean by evaporation? How is it affected by surface area?
What is absolute zero temperature?
What is absolute zero?
What is diffusion? Explain with an example.
What is meant by absolute zero?
What is normal body temperature?
What is the value of normal human blood pressure? Also give the value of blood pressure in hypertension,
What will happen if the pressure on a sample of gas is raised three times and its temperature is kept constant?
When a gas is allowed to expand, what will be its effect on its temperature?
Which allotropic form of carbon is stable at room temperature (25 ⁰C)?
Which form of sulphur exists at room temperature?
Which is lighter one aluminium or gold?
Which variable(s) are kept constant in Charles’s law?
Which variables are kept constant in Charles’s law?
Why amorphous solids do not have sharp melting points while crystalline solids do have?
Why are the gases compressible?
Why does evaporation increase with the increase of temperature?
Why does rate of diffusion increase with increase of temperature?
Why is the boiling point of water higher than that of alcohol?
Why is the melting point of a solid considered its ‘identification’ characteristic?
Why is vapour pressure higher at high temperature?
Why is white tin available at room temperature?
Why the density of a gas increases on cooling?
Why volume of a gas decreases with increase of pressure?
Write reasons for allotropy.
Write the molecular formula of a sulphur molecule?

Long Questions


A gas at pressure 912 mm of Hg has volume 450 cm³ . What will be its volume at 0.4 atm
A gas occupies a volume of 35.0 dm³ at 17 ⁰C. If the gas temperature rises to 34oc at constant pressure, would you expect the volume to double? If not calculate the new volume.
A gas occupies a volume of 800 cm³ at 1 atm, when it is allowed to expand up to 1200 cm³ what will be its pressure in mm of Hg.
A sample of gas is cooled at constant pressure from 30 ⁰C to 10 ⁰C. Comment:
a. Will the volume of the gas decrease to one third of its original volume?
b. If not, then by what ratio will the volume decrease?
A sample of neon gas occupies a volume of 75.0 cm³ at very low pressure of 0.4 atm.
A sample of oxygen gas has a volume of 250 cm³ at  – 30 ⁰C. If gas is allowed to expand up to 700 cm³ at constant pressure, find out its final temperature.
Assuming temperature remain constant what would be the volume at 1.0 atm. pressure?
Convert the following units:
(a) 750 ⁰C to K (b) 150 ⁰C to K
(c) 100Kto ⁰C (d) 172K to ⁰C
Convert the following units:
(a) 850 mm Hg to atm (b) 205000 Pa to atm
(c) 560 torr to cm Hg (d) 1.25 atm to Pa
Define and explain Charles law.
Define boiling point and also explain, how it is affected by different factors.
Define Boyle’s law and verify it with an example.
Define evaporation. Discuss the factors affecting on evaporation.
Define vapour pressure and explain different factors on which it depends.
Describe the phenomenon of diffusion in liquids along with factors which influence it.
Describe the solid state of matter and describe its various properties.
Differentiate between crystalline and amorphous solids.
Explain the amorphous and crystalline solids. Give at least two examples of each.
Explain the two types of solids.
It is desired to increase the volume of a fixed amount of gas from 87.5 to 118 cm³ while holding the pressure constant. What would be the final temperature if the initial temperature is 23 ⁰C.
State Boyle’s law and verify it with experiment.
The largest moon of Saturn, is Titan. It has atmospheric pressure of 1.6 x l05 Pa. What is the atmospheric pressure in atm? Is it higher than earth’s atmospheric pressure?
What is vapour pressure and how it is affected by intermolecular forces?

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