Answered: What are the definitions and…

Living By Chemistry: First Edition Textbook

1st Edition

ISBN:9781559539418

Author:Angelica Stacy

Publisher:Angelica Stacy

ChapterU2: Smells: Molecular Structure And Properties

SectionU2.15: Attractive Molecules: Attractions Between Molecules

Problem 2E

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Are changes in state physical or chemical changes? Explain. What type of forces must be overcome to melt or vaporize a substance (are these forces intramolecular or intermolecular)? Define the molar heat of fusion and molar heat of vaporization. Why is the molar heat of vaporization of water so much larger than its molar heat of fusion? Why does the boiling point of a liquid vary with altitude?
The enthalpy of vaporization of water is larger than its enthalpy of fusion. Explain why.
Define the joule in terms of SI base units.
Using the explanation of unbalanced forces as the source of surface tension, justify why it requires energy to increase the surface area of a liquid. Is there any circumstance in which energy is given off when increasing a liquids surface area?
9.46 The heat of fusion of pure silicon is 43.4 kJ/mol. How much energy would be needed to melt a 5.24-g sample of silicon at its melting point of 1693 K?
How many grams of water at 0C will be melted by the condensation of 1 g of steam at 100C?
A calorimeter contains 72.0g of water at 19.2C. A 141-g piece of tin is heated to 89.0C and dropped into the water. The entire system eventually reaches 25.5C. Assuming all of the energy gained by the water comes from the cooling of the tin-no energy loss to the calorimeter or the surroundings-calculate the specific heat of the tin.
Consider the iodine monochloride molecule, ICI. Because chlorine is more electronegative than iodine, this molecule is a dipole. How would you expect iodine monochloride molecules in the gaseous state to orient themselves with respect to each other as the sample is cooled and the molecules begin to aggregate? Sketch the orientation you would expect.
Which of the following statements is true? Specific heat capacity is dependent on the amount of the substance Specific heat is characterized as a function of temperature Latent heat of fusion is dependent on temperature ? Latent heat of fusion is usually greater than the latent heat of vaporization.
What are adhesive forces? a)The intermolecular attraction forces that make molecules of one substance stick to surfaces with which they come into contact. b)The forces that make some molecules denser than others. c)The forces that attract positive and negative particles to each other. d)The intermolecular attraction forces that make molecules of one substance repel the surfaces with which they come into contact.
Which change happens when a substance melts? O The molecules of the substance move farther apart, which pulls on the intermolecular Donds betweenr iem. Heat energy overcomes the forces of attraction between the molecules of the substance, so the molecules can move more freely. O Heat energy forces the molecules of the substance farther apart until the rigid structure of the solid breaks. The vibration of the molecules produces enough heat to weaken the forces of attraction between the molecules of the substance. Type here to search 立

3. Is solid > liquid → gas an endothermic or exothermic process? Describe how this energy change affects the energy of the molecules and their intermolecular forces.

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What are the definitions and explanantions of the four intermolecular forces?