Physical states of matter: Solved exercise and Think-Tank

Question2: Give short answers.

i. Explain why volume of a gas decreases on increasing pressure on it at constant temperature?

ii. How does temperature affect vapour pressure of a liquid?

iii. Why does water boil in a pressure cooker at 12 0 c?

iv. Is evaporation a cooling process?

v. Can you make water boil at 70° C.

vi. Express pressure 400 mm SG in kpk question.

Question 3. Explain the effect on volume of a gas by change in the pressure be temperature on the boiling point.

Question 7. Differentiate between amorphous and crystal solids.

Question. 8: Explain allo trophic form of any two solid.

Question 9: Plots of vapour pressure versus temperature of given in the following figure.

a. find the boiling point of each liquid when the temperature at mass represher is 18.

b. At what temperature ethanol will boil when the atmospheric pressure is 51 kPa.

c. How can you make water to boil at 80 oC.

d. At what temperature chloroform will boil when external pressure is 50 kPa.

e. Can you boil chloroform at 0o C?

f. Predict the boiling point of chloroform at 600 mm Hg?

Question 11; Why does evaporation lower the temperature of a liquid?

Question 12: the year in a perfect elastic balloon occupies 885 cm cube during the fall when the temperature is 20 oC. During the winter, the temperature on a particular day is -10 oC, the balloon occupies 794.39 cm3. If pressure remains constant. Show that the given data proves the volume temperature relation according to Charles's law.

Question 13. In the past, the gas wali was used as a way to temperature using devices called Gas thermometer and explain experiment obtained following data from a Gas thermometer show the Gas thermometer obtained result according Charles law.

Question 14: In automobile engine the gases fuel fair mixer enter the Slender and its compressed by moving Piston before it is ignited if the initial cylinder volume is 990 cm cube after the pistol move the volume is 90 cm cube initially has a pressure of 1.0 atm. and final price 11 atm. Do you think this change occur according to Boyl's law.

Question 15;

A sample of new on that is used in as volume of 1500 cm cube at a pressure of 636 hour the volume of gas after it is pump into the glass tube of a sign is 12 13.74 cm cube when it shows pressure of 786 comment on it.

Question 16: instrumentation changes as science progress. Comment on it.

Think-Tank

Following table shows data collected from the experiment by a student.

Volume (dm3) Pressure (mmHg)

400 353.5

320 442

240 589

200 707

Do you think there the student collected data carefully aur carelessly. Justify

Aquarium decreases slowly even though the tank doesn't leak. Interpret it.

Question 3 illustrate types of attractive forces you expect between the molecules of HF and HCL

Question 4: Name two substances that are solid at 25 oC

name two substances that are liquid at 25 oC.

Question 5: Identify the process occurring in each of the following

a Mathballs slowly disappear

b. A cold windshield becomes covered with ice when truck by raindrops.

Question 6: An autoclave is used to sterilize surgical equipment it is far more effective to produce steam by autoclave than same produce from boiling water in open atmosphere because it generates team at pressure of two atmosphere and auto Grave is such an efficient sterilisation device and 7 the following table show the melting point and boiling points of force substances.

Substances melting point boiling points

A -123 -70

B -17 58

C 52 305

D -6 120

a. Write the physical state of each substan at room temperature and one atm.

b. Name the two substance that exist as l liquid for the longest range of temperature see interpret what will happen to the substance P when it is heated from zero degree to 100 degree D interprenet what will happen to the substance the when it is gold from 100 to -20

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