Chemistry for Engineering Students
3rd Edition
ISBN: 9781285199023
Author: Lawrence S. Brown, Tom Holme
Publisher: Cengage Learning
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Chapter 7, Problem 7.34PAE
7.30 The bond in HF is said to be polar, with the hydrogen carrying a partial positive charge. For this to be true, the hydrogen atom must have less than one electron around it. Yet the Lewis dot structure of HF attributes two electrons to hydrogen. Draw a picture of the electron density distribution for HF and use it to describe how the hydrogen atom can carry a partial positive charge. How can these two models of the HF bond (the electron density and the Lewis structure) seem so different and yet describe the same thing?
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Chapter 7 Solutions
Chemistry for Engineering Students
Ch. 7 - List some factors influencing the biocompatibility...Ch. 7 - • use electron configurations to explain why...Ch. 7 - • describe die energy changes in the formation of...Ch. 7 - • define electronegativity and state how...Ch. 7 - • identify or predict polar, nonpolar, and ionic...Ch. 7 - • write Lewis electron structures for molecules or...Ch. 7 - • describe chemical bonding using a model based on...Ch. 7 - • explain how hybridization reconciles observed...Ch. 7 - • predict the geometry of a molecule from its,...Ch. 7 - • use models (real or software) to help visualize...
Ch. 7 - • explain the formation of multiple bonds in terms...Ch. 7 - • identify sigma and pi bonds in a molecule and...Ch. 7 - Define the term biocompatibility.Ch. 7 - List some properties associated with biomaterials...Ch. 7 - Prob. 7.3PAECh. 7 - Prob. 7.4PAECh. 7 - Prob. 7.5PAECh. 7 - Prob. 7.6PAECh. 7 - Why is the ion not found in nature?Ch. 7 - Why do nonmetals tend to form anions rather than...Ch. 7 - Prob. 7.9PAECh. 7 - 7.10 Arrange the members of each of the following...Ch. 7 - 7.11 Arrange the following sets of anions in order...Ch. 7 - 7.12 Which pair will form a compound with the...Ch. 7 - In a lattice, a positive ion is often surrounded...Ch. 7 - Use the concept of lattice energy to rationalize...Ch. 7 - 7.13 Figure 7-2 depicts the interactions of an ion...Ch. 7 - Mat type of bond is likely to form between one...Ch. 7 - 7.14 Describe the difference between a covalent...Ch. 7 - Prob. 7.18PAECh. 7 - Sketch a graph of the potential energy of two...Ch. 7 - Prob. 7.20PAECh. 7 - 7.17 Coulombic forces are often used to explain...Ch. 7 - 7.18 In terms of the strengths of the covalent...Ch. 7 - 7.19 If the formation of chemical bonds always...Ch. 7 - 7.20 Draw the Lewis dot symbol for each of the...Ch. 7 - 7.21 Theoretical models for the structure of...Ch. 7 - 7.22 Use Lewis dot symbols to explain why chlorine...Ch. 7 - 7.23 Define the term lone pair.Ch. 7 - 7.24 How many electrons are shared between two...Ch. 7 - 7.25 How does the bond energy of a double bond...Ch. 7 - 7.26 How is electronegativity defined?Ch. 7 - 7.27 Distinguish between electron affinity and...Ch. 7 - 7.28 Certain elements in the periodic table shown...Ch. 7 - 7.29 When two atoms with different...Ch. 7 - 7.30 The bond in HF is said to be polar, with the...Ch. 7 - 7.31 Why is a bond between two atoms with...Ch. 7 - Prob. 7.36PAECh. 7 - 7.33 In each group of three bonds, which bond is...Ch. 7 - Prob. 7.38PAECh. 7 - Prob. 7.39PAECh. 7 - 7.35 Which one of the following contains botb...Ch. 7 - Prob. 7.41PAECh. 7 - Prob. 7.42PAECh. 7 - 7.37 Draw the Lewis structure for each of the...Ch. 7 - 7.38 Draw a Lewis structure for each of the...Ch. 7 - Prob. 7.45PAECh. 7 - 7.40 Why is it impossible for hydrogen to be the...Ch. 7 - Prob. 7.47PAECh. 7 - 7.42 Draw resonance structure for (a) (b) and (c)Ch. 7 - Prob. 7.49PAECh. 7 - Prob. 7.50PAECh. 7 - Prob. 7.51PAECh. 7 - 7.46 Consider the nitrogen-oxygen bond lengths in...Ch. 7 - 7.47 Which of the species listed has a Lewis...Ch. 7 - 7.48 Identify what is incorrect in the Lewis...Ch. 7 - 7.49 Identify what is incorrect in the Lewis...Ch. 7 - 7.50 Chemical species are said to be isoelectronic...Ch. 7 - 7.51 Explain the concept of wave interference in...Ch. 7 - Distinguish between constructive and destructive...Ch. 7 - How is the concept of orbital overlap related to...Ch. 7 - 7.52 How does orbital overlap explain the buildup...Ch. 7 - 7.53 How do sigma and pi bonds differ? How are...Ch. 7 - 7.54 CO , CO2 , CH3OH , and CO32 , all contain...Ch. 7 - 7.55 Draw the Lewis dot structure of the following...Ch. 7 - 7.56 Draw the Lewis dot structures of the...Ch. 7 - 7.57 What observation about molecules compels us...Ch. 7 - Prob. 7.66PAECh. 7 - 7.59 What type of hybrid orbital is generated by...Ch. 7 - Considering only s and p atomic orbitals, list all...Ch. 7 - 7.61 What hybrid orbitals would be expected for...Ch. 7 - 7.62 What type of hybridization would you expect...Ch. 7 - 7.63 What physical concept forms the premise of...Ch. 7 - 7.64 Predict the geometry of the following...Ch. 7 - Prob. 7.73PAECh. 7 - Prob. 7.74PAECh. 7 - Prob. 7.75PAECh. 7 - 7.68 Give approximate values for the indicated...Ch. 7 - 7.69 Propene has the chemical formula Describe the...Ch. 7 - Prob. 7.78PAECh. 7 - Describe what happens to the shape about the...Ch. 7 - Prob. 7.80PAECh. 7 - Prob. 7.81PAECh. 7 - 7.72 How does an MSN differ from amorphous silica...Ch. 7 - Prob. 7.83PAECh. 7 - Prob. 7.84PAECh. 7 - Prob. 7.85PAECh. 7 - Prob. 7.86PAECh. 7 - 7.91 A Lewis structure for the oxalate ion is...Ch. 7 - Prob. 7.88PAECh. 7 - 7.93 An unknown metal M forms a chloride with the...Ch. 7 - Prob. 7.90PAECh. 7 - Prob. 7.91PAECh. 7 - 7.96 Consider the hydrocarbons whose structures...Ch. 7 - 7.97 Consider the structure shown below for as...Ch. 7 - Prob. 7.94PAECh. 7 - Prob. 7.95PAECh. 7 - Prob. 7.96PAECh. 7 - 7.101 Lead selenide nanocrystals may provide a...Ch. 7 - Prob. 7.98PAECh. 7 - Prob. 7.99PAECh. 7 - 7.104 Hydrogen azide, HN3 , is a liquid that...Ch. 7 - Prob. 7.101PAECh. 7 - Prob. 7.102PAECh. 7 - 7.107 How do the Lewis symbols for C, Si, and Ge...Ch. 7 - Prob. 7.104PAECh. 7 - Prob. 7.105PAE
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- Sketch a graph of the potential energy of two atoms as a function of the distance between them. On your graph, indicate how bond energy and bond distance are defined.arrow_forward7.46 Consider the nitrogen-oxygen bond lengths in NO2+ , NO2 , and NO3 . In which ion is the bond predicted to be longest? In which is it predicted to be the shortest? Explain briefly.arrow_forward7.63 What physical concept forms the premise of VSEPR theory?arrow_forward
- No Plagiarism Please! A chemical reaction produces formaldehyde, with a chemical formula of CH2O. Carbon is in Group 4A, oxygen is in Group 6A, and hydrogen is in Group 1A on the periodic table. In one to two sentences, describe the bonds in a molecule of formaldehyde in terms of valence electronsarrow_forward*Write an electron-dot structure for chloral hydrate, also known in old detective novels as "knockout drops."arrow_forwardCombine two elements (cesium, berryllium, bromine, and flourine) from the following: ( K, Mg, Mn, N, O, Fe, Cu, H, S, Kr,C, Na, Br, Cl) to form 5 different molecules, including one oxy atomic moleculeand one diatomic molecule from the given elements(cesium, berryllium, bromine, and flourine), and determine the following: a) the electronegativity of the compound (show your calculation) b) Is the selected molecule polar, or not? What type of bond is formed based onwhat you learned? Is it a strong or weak bond?arrow_forward
- Some chemical reactions proceed by the in it ial loss or transfer of an electron to a diatomic species. Which of the molecules N2, NO. O2, C2, F2, and CN would you expect to be stabil ized by (a) the addit ion of an electron to form AB-. (b) the removal of an electron to form AB+?arrow_forwardHow is the concept of orbital overlap related to the wave nature of electrons?arrow_forward7.53 How do sigma and pi bonds differ? How are they similar?arrow_forward
- A compound of tin and chlorine is a colorless liquid. The vapor has a density of 7.49 g/L at 151C and 1.00 atm. What is the molecular mass of the compound? Why do you think the compound is molecular and not ionic? Write the Lewis formula for the molecule.arrow_forwardWhy do third – period elements expand their covalence above four?arrow_forwardWhich has the greater N–O bond length, NO2– or NO3–? Can you explain why the answer is NO3-? Both have single bonds and double bonds so are they not the same?arrow_forward
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