U Review Questions in C#

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U Review Questions
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Answer the following questions You have 20 minutes, and you may not use a calculator You may use the periodic table at the back of this book Choose from the following descriptions of solids for questions 1 4 (A) composed of macromolecules held together by strong bonds (B) composed of atoms held together by delocalized electrons (C) composed of positive and negative ions held together by electrostatic attractions (D) composed of molecules held together by intermolecular dipole dipole interactions (E) composed of molecules held together by intermolecular London forces 1 Fe(s) 2 KNO3(s) 3 SiO2(s) 4 HCl(s) For questions 5 and 6 choose from the following (A) (B) (C) (D) (E) an ionic solid a metallic solid a molecular solid containing nonpolar molecules a covalent network solid a molecular solid containing polar molecules
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5 Diamond, C(s) 6 Solid sulfur dioxide, SO2(s)
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174 U Step 4 Review the Knowledge You Need to Score High
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7 The approximate boiling points for hydrogen compounds of some elements in the nitrogen family are: (SbH3 15 C), (AsH3 62 C), (PH3 87 C), and (NH3 33 C) The best explanation for the fact that NH3 does not follow the trend of the other hydrogen compounds is (A) NH3 is the only one to exhibit hydrogen bonding (B) NH3 is the only one that is water-soluble (C) NH3 is the only one that is nearly ideal in the gas phase (D) NH3 is the only one that is a base (E) NH3 is the only one that is nonpolar 8 The critical point is (A) the highest temperature and pressure where the substance may exist as discrete liquid and gas phases (B) the temperature and pressure where the substance exists in equilibrium as solid, liquid, and gas phases (C) the highest temperature and pressure where a substance can sublime (D) the highest temperature and pressure where the substance may exist as discrete liquid and solid phases (E) the highest temperature and pressure where the substance may exist as discrete solid and gas phases 9 For all one-component phase diagrams, choose the correct statement from the following list (A) The line separating the gas from the liquid phase may have a positive or negative slope (B) The line separating the solid from the liquid phase may have a positive or negative slope (C) The line separating the solid from the liquid phase has a positive slope (D) The temperature at the triple point is the same as at the freezing point (E) The triple point is at a pressure above 1 atm Choose the appropriate answer from the following list for questions 10 and 11 (A) (B) (C) (D) (E) London dispersion forces covalent bonding hydrogen bonding metallic bonding ionic bonding
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10 This is the reason why argon may be solidified at a sufficiently low temperature 11 This is the reason why diamond is so hard 12 The triple point (A) represents the highest pressure at which the liquid can exist (B) is the lowest pressure at which the liquid can exist (C) represents the lowest temperature at which the vapor can exist (D) is 015 K higher than the melting point of the solid (E) is at a pressure of 1 atm 13 A sample of a pure liquid is placed in an open container and heated to the boiling point Which of the following may increase the boiling point of the liquid I The size of the container is increased II The container is sealed III A vacuum is created over the liquid (A) II and III (B) and III (C) III only (D) II only (E) I only 14 Which of the following best explains why 1-butanol, CH3CH2CH2CH2OH, has a higher surface tension than its isomer, diethyl ether, CH3CH2OCH2CH3 (A) (B) (C) (D) (E) the higher density of 1-butanol the lower specific heat of 1-butanol the lack of hydrogen bonding in 1-butanol the higher molecular mass of 1-butanol the presence of hydrogen bonding in 1-butanol
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