5) Consider the phase diagram for carbon dioxide(10) 30-. Solid Liquid Gas -785

Question

5) Consider the phase diagram for carbon dioxide(10) 30-. Solid Liquid Gas -785 -56.4 31.1 Temperature a) what is the critical temperature for carbon dioxide? b) What is the critical pressure for carbon dioxide? c) What phase(s) is/are present at-10°C and 30 atm. d) What phase(s) is/are present at 60°C and 10 atm. e) What phase(s) is/are present at-78.5°C and 1 atm. f) What phase(s) is/are present at-56.4°C and 5.11 atm. g) What is the normal sublimation point of carbon dioxide._ 6) True or False Instantaneous dipoles exist is all molecules and atoms. Viscosity decreases with increasing temperature. For molecules with similar size and molar mass, those with higher polarity would have lower boiling points __ a. b. c. d. Van der Waals forces are weaker than ionic bonds but stronger than e. Liquids with weaker intermolecular interactions have lower viscosity. f. Ice has a higher density than water because ice has a ordered cagelike g. The strength of dispersion forces depends on the molar mass and has covalent bonds. structure due to hydrogen bonding little to due with the shape of the molecules involved.

Explanation / Answer

5) a) 31.1°C

b) 73 atm

c) Solid only

d) Solid only

e) Solid and gas

f) Solid, liquid and gas

g) -78.5°C

6) a) true

b) true ( for liquids)

c) false

d) false

e) true

f) false

g) false. Since it depends on surface area also i.e.on shape also.

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