(a)
Interpretation:
A plot of the boiling point in kelvins versus the number of hydrogen atoms present in
Concept Introduction:
Hydrogen bonding:
Hydrogen bonding is a special form of dipole-dipole interaction. When a hydrogen atom is bonded to a small electronegative atom (like
London forces:
London(dispersion) forces happen because sometimes, when adjacent molecules line up so that they form temporary dipoles, there is a weak force of attraction between the end of one molecule where more of the electrons are accumulating at the moment and the end of a second molecule where the electrons are not staying at the moment.
(b)
Interpretation:
A plot of the molar vaporization enthalpy versus the number of hydrogen atoms present in
Concept Introduction:
Refer to part (a).
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Chapter 9 Solutions
Chemistry: The Molecular Science
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- 9.10 The kinetic energy of molecules is often used to induce chemical reactions. The bond energy in an O1 molecule is 8.221019J . Can an O2 molecule traveling at 780 m/s provide enough energy to break the O = O bond? What is the minimum velocity of an O2 molecule that would give a kinetic energy capable of breaking the bond if it is converted with 100% efficiency?arrow_forwardUse a Born-Haber cycle (Sec. 5-13) to calculate the lattice energy of MgF2 using these thermodynamic data. Compare this lattice energy with that of SrF2, −2496 kJ/mol. Explain the difference in the values in structural terms.arrow_forwardThe lattice energy of KF is 794 kJ/mol, and the interionic distance is 269 pm. The Na—F distance in NaF, which has the same structure as KF, is 231 pm. Which of the following values is the closest approximation of the lattice energy of NaF: 682 kJ/mol, 794 kJ/mol, 924 kJ/mol, 1588 kJ/mol, or 3175 kJ/mol? Explain your answer.arrow_forward
- nk the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling nt, choose 2 next to the substance with the next highest boiling point, and so on. substance A B C D chemical symbol, chemical formula or Lewis structure NO :O: H HIC C-H 1 H N₂ :0: || .. HIC N-H 1 H boiling point ✓ (Choose one) 1 (highest) 2 3 4 (lowest) (Choose one) ✓ (Choose one) ✓ X Śarrow_forwardCH,OH The name carbohydrate comes from the fact that many simple sugars have chemical formulae that look like water has simply been added to carbon. (The suffix hydrate from the Greek word hydor ("water") means "compound formed by the addition of water.") OH The actual chemical structure of carbohydrates doesn't look anything like water molecules bonded to carbon atoms (see sketch at right). But it is nevertheless possible to chemically extract all the hydrogen and oxygen from many simple carbohydrates as water, leaving only carbon behind. If you search the Internet for "reaction of sulfuric acid and sugar" you will find some impressive videos of this. НО OH ОН The actual chemical Suppose you had (200. g) of ordinary table sugar, which chemists call sucrose, and which has the chemical formula C,,H,,0,. 22 structure of glucose. 12 Calculate the maximum mass of water you could theoretically extract. Be sure your answer has a unit symbol, and round it to 3 significant digits. x10 ?arrow_forwardFor the molecules HCN and CH3NH₂arrow_forward
- The OH covalent bond has a very high bond energy of about 463 kJ / mol. The electrostatic bond of the hydrogen bond has an energy between 10 and 40 kJ / mol. Although the hydrogen bond is relatively weak compared to the covalent bonds, it is stronger than the Van der Waals interactions and plays among other things a primordial role in the biological systems and on the physicochemical properties of water. (as heard in the 1st audio) Thus the consequences of the existence of strong hydrogen bonds are remarkable on the temperatures of change of state of water compared to compounds of similar structure. According to the following graph, 2- What are these values for water? What is the temperature range of existence of liquid water at normal pressure (1 atm)? What would these values be if the water molecule were not also polar (Extrapolate by following the dotted lines)? 100 °C 60 boiling point H2O 20 -20 H2Se H2S H,Te -60 freezing point -80 40 80 g/moi 160 masse molaire températurearrow_forwardHow does decreasing the total energy of the system affect the stability of the pair of atoms in the system? Does this decrease in total energy make them more or less likely to stick together (AKA form a stable interaction)? Choice 1 :More likely to stick together Choice 2 of 2:Less likely to stick together Explain why in the box below, be sure to reference the actions of the atoms and molecules as the energy flows from the system (two He atoms) to the surroundings (the outside molecule).arrow_forwardRank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. substance B C D chemical symbol, chemical formula or Lewis structure H H II II H H H HIC-C-0-C-H HIC I | | H ** :N-0-H HIC H Ar H Cr H I boiling point (Choose one) O (Choose one) (Choose one) (Choose one) oarrow_forward
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