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26 Cards in this Set
- Front
- Back
A liquid boils when.. |
its vapor pressure is equal to, or greater than, the external pressure pushing on it |
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Which of the following statements concerning intermolecular forces is/are CORRECT?1. Dipole-dipole attractions occur in all molecules that contain polar bonds, regardless of whether the molecule has a dipole.2. Induced dipole/induced dipole forces exist in all molecular solids.3. Hydrogen bonding only occurs in all molecules containing OH bonds. |
1 only |
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Which one of the following molecules will exhibit dipole-dipole intermolecular forces as a pure liquid? |
PH3 |
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Hydrogen bonding is present in all of the following molecular solids EXCEPT |
H2SO4 (dihydrogen sulfate) |
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Below are the vapor pressures of some compounds measured at 20oC. Which of these would you expect to have the highest boiling point? |
Diethylether, C4H10O, 442.2 mmHg |
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Each of the following substances is a liquid at -50oC. Place these liquids in order of increasing vapor pressure.dimethyl ether (CH3OCH3), propane (C3H8), ethanol (CH3CH2OH) |
Propane < dimethyl ether < ethanol |
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Which property of water allows a razor blade to float on it without sinking? |
Surface tension |
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Which two of the following materials are most likely to be amorphous solids: water, nylon, glass, potassium nitrate? |
Water and glass |
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Which of the following changes will be exothermic? |
Gas to a liquid |
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At its boiling point of 58.8 oC, 3.66 kJ of heat is required to vaporize 19.5 g of bromine (Br2). What is the molar enthalpy of vaporization of bromine? |
30.0 kJ/mol |
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The process of condensation happens when which of the following occurs? |
A gas becomes a liquid. |
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Which of the following statements is/are CORRECT?1. If the intermolecular forces in a liquid decrease, the normal boiling point of the liquid decreases.2. If the temperature of a liquid increases, the equilibrium vapor pressure increases.3. If the surface area of a liquid increases, the equilibrium vapor pressure of the liquid increases. |
1 and 2 |
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Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point? |
Methanol, bp = 65oC |
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Which of the following is NOT true with regard to water? |
ice is more dense than liquid water. |
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Which of the following phase transitions is/are endothermic?1. liquid water freezing to a solid at its normal freezing point of 0.0 °C.2. the sublimation of solid carbon dioxide into the gas phase.3. gaseous sulfur dioxide condensing into a liquid at its boiling point of –10.0 °C. |
2 only |
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Which of the following statements concerning intermolecular forces is/are CORRECT? 1. Dipole-dipole attractions occur in all molecules that contain polar bonds, regardless of whether the molecule has a dipole. 2. Induced dipole/induced dipole forces exist in all molecular solids. 3. Hydrogen bonding only occurs in all molecules containing OH bonds. |
1 and 2 |
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For which of the following species are the dispersion forces strongest? |
C8H18 |
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The boiling points of some group 7A hydrides are tabulated below.gas b.p. (°C)NH3 –33PH3 –88AsH3 –62Which intermolecular force or bond is responsible for the high boiling point of NH3 relative to PH3 and AsH3? |
Hydrogen bonding |
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You are given the following boiling point data. Which of the liquids would you expect to have the highest vapor pressure at room temperature? |
Diethyl ether, C3H10O2 34.5 °C |
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Which of the following properties of water can be attributed to hydrogen bonding?1. high melting point2. high heat of vaporization3. low vapor pressure4. high surface ten |
1,2,3, and 4 |
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Which of the following crystallizes in a metallic lattice? |
K |
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Ammonia, NH3, is used as a refrigerant. At its boiling point of –33 oC, the standard enthalpy of vaporization of ammonia is 23.3 kJ/mol. How much heat is released when 50.0 g of ammonia is condensed at –33 oC? |
–68.4 kJ |
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Given the following compounds and their vapor pressures (VP). Arrange them in increasing (lowest to highest) order of boiling points.ethane (C2H6); VP= 841 mm Hgpentane (C5H12); VP=420 mm Hgisopropyl alcohol (C3H5OH); VP=31.5 mm Hgacetone (C3H6O); VP=185 mm Hg |
Ethane < pentane < acetone < isopropyl alcohol |
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Which of the following molecules has the highest vapor pressure? |
CH4 |
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endothermic |
melting- solid to liquid sublimation- solid to gas vaporization- liquid to gas |
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exothermic |
freezing- liquid to solid deposition- gas to solid condensation- gas to liquid |