Practice.docx - 1.1.7 Practice Intermolecular Forces and...

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1.1.7 Practice: Intermolecular Forces and the Properties of Solids and Liquids AP Chemistry Sem 2 Points Possible: 25 Name: Kayla James You will need to use a periodic table to complete this activity. 1. Predict the properties of substances required to answer each of the following questions. In each case, explain your answer by relating the intermolecular forces of the substances to their properties. a. An oil refinery plans to separate a mixture that contains propane and octane, shown below, by vaporizing the mixture and then collecting the substances as they cool and condense. Will propane or octane condense at a lower temperature? (1 point)
b. At the same temperature, which has a higher viscosity, acetone or glycerine? (1 point)
c. At a given temperature, which has a higher vapor pressure, nitric oxide, NO, or ammonia, NH 3 ? (1 point)
2. During cold winter months, a thick layer of ice forms on a lake. As the days become warmer, the ice slowly melts. a. Predict how the forces of attraction among the particles will change between the solid and the liquid phases. (2 point)
b. Explain why a thick layer of ice on the lake can support the weight of a person, but the liquid water cannot. (2 point)
3. Polluted ground water might have high levels of ammonia (NH 3 ) dissolved in the water. Draw a particle model showing the interactions between the solute and the solvent for this solution. Label and explain your model.(1 point)
4. The particle model below represents a 1.0 M solution. (Each particle shown represents a large number of actual particles.) Draw the correct number of particles in each of the other models to represent the given molarities based on the amount of solvent shown in each case. (1 point)

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