13. Liquids, Solids & Intermolecular Forces

Heating and Cooling Curves

Multiple Choice
If 53.2kJ of heat are added to a 15.5g ice cube at - 5.00 ^oC, what will be the resulting state and temperature of the substance?
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Open Question
Which is the process by which a gas changes to a solid: deposition, evaporation, freezing, or sublimation?
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Multiple Choice
Which of the following does NOT represent a step on the heating curve of water?
Multiple Choice
According to the cooling curve of water, which segment represents the phase change from liquid to solid?
Multiple Choice
In a typical heating curve for water, which arrows represent the phase transitions where heat energy is gained by the substance?
Multiple Choice
Which statement is true for a cooling curve of a pure substance?
Multiple Choice
Which of the following correctly describes a heating-cooling curve for a pure substance?
Multiple Choice
Which of the following statements correctly describes a heating or cooling curve for a pure substance?
Multiple Choice
What process is represented if a heating curve for a substance is reversed?
Open Question
What quantity of heat, in kj, is required to convert 50.0 g of ethanol (C₂H₅OH) at 23.0°C to a vapor at 78.3°C (its boiling point)? (specific heat capacity of ethanol = 2.46 J/g • c; ∆H_vap = 39.3 kJ/mol)
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Open Question
What are greenhouse gases? How does carbon dioxide enter the atmosphere? (Site 1)
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Multiple Choice
Calculate the volume (mL) of acetone, C₃ H₆ O, (density = 0.786 g/mL) that can be vaporized at its normal boiling point with 345 kJ of heat. ΔH_vap for acetone is 29.1 kJ/mol.
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Open Question
If the heating curve is reversed, what would best describe the boiling point?
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Multiple Choice
How much energy (kJ) is required to convert a 76.4 g acetone (MM = 58.08 g/mol) as a liquid at -30°C to a solid at -115.0°C?

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Multiple Choice
Determine the vapor pressure (atm) of rubbing alcohol (isopropanol) at 20.0℃. The normal boiling point of isopropanol is 82.3℃ and the heat of vaporization (ΔH_vap) is 39.9 kJ/mol.
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