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45: For each of the following pairs of gas properties, describe the relationship between the properties, describe a simple system that could be used to demonstrate the relationship, and explain the reason for the relationship:
(a) volume and pressure when number of gas particles and temperature are constant, (b) pressure and temperature when volume and the number of gas particles are constant, (c) volume and temperature when pressure and the number of gas particles are constant, (d) the number of gas particles and pressure when volume and temperature are constant, and (e) the number of gas particles and volume when pressure and temperature are constant.
56: Ethylene oxide is produced from the reaction of ethylene and oxygen at
270-290 °C and 8-20 atm. In order to prevent potentially dangerous pressure buildups, the container in which this reaction takes place has a safety valve set to release gas when the pressure reaches 25 atm. If a 15-m3 reaction vessel contains 7.8 × 103 moles of gas, at what temperature will the pressure reach 25 atm? (There are 103 L per m3.)
84: The hydrogen gas used to make ammonia can be made from small hydrocarbons such as methane in the so-called steam-reforming process, run at high temperature and pressure.
C3H8 + 3H2O→ 3CO + 7H2
3CO + 3H2O→ 3CO2 + 3H2
103: The atmosphere of Venus contains carbon dioxide and nitrogen gases. At the planet’s surface, the temperature is about 730 K, the total atmospheric pressure is 98 atm, and the partial pressure of carbon dioxide is 94 atm. If scientists wanted to collect 10.0 moles of gas from the surface of Venus, what volume of gas should they collect?
41: Acetone, CH3COCH3, is a laboratory solvent that is also commonly used as a
nail polish remover.
acetone when it evaporates.
escape? If not, why not? What three criteria must be met for a molecule to
escape from the surface of the liquid and move into the gas phase?
same amount of acetone in a test tube. Why?
more quickly than the same amount of acetone spilled on the cooler lab
50: Butane is a gas at room temperature and pressure, but the butane found in some
cigarette lighters is a liquid. How can this be?
55: Classify each of the following bonds as nonpolar covalent, polar covalent, or
ionic. If a bond is polar covalent, identify the atom that has the partial negative
charge and the atom that has the partial positive charge. If a bond is ionic,
identify the ion that has the negative charge and the ion that has the positive
37: Would the following combinations be expected to be soluble or insoluble?
41: Predict whether each of the following is soluble in water or not.
56: You throw a backyard party that resembles your idea of a big Texas barbecue. The guests get more food than they could possibly eat, including a big juicy steak in the center of each plate. Describe how soap or detergent can help you clean the greasy plates you’re left with when your guests go home, referring to the interactions between particles and the corresponding changes that take place on the submicroscopic level.
62: Some of the minerals found in rocks dissolve in water as it flows over the rocks. Would these minerals dissolve more quickly
64: Solutions are called dilute when the concentration of the solute in solution is relatively low and concentrated when the concentration is relatively high. Can a solution be both dilute and saturated? Explain your answer.
68: You visit a dude ranch located in a beautiful mountain valley at an altitude of 6000 feet. The day you arrive, you decide to take your usual evening run. On this evening, however, you don’t run as far as usual, because you feel winded and tired much sooner than at home by the beach. Why does this happen?
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