8.90 Geckos are known for their ability to climb smooth vertical walls or windows. Recent research has shown that this unusual trait results from dispersion forces between the surface and the tips of tiny hairlike setae an the Gecko’s feet. Many materials science and engineering groups are working to develop tapes and other adhesives designed to mimic this behavior. Do a web search to find information about such efforts and write a short summary explaining how one resulting adhesive is related to ideas we explored in this chapter.

BuyFind

Chemistry for Engineering Students

4th Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781337398909
BuyFind

Chemistry for Engineering Students

4th Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781337398909

Solutions

Chapter 8, Problem 8.90PAE
Textbook Problem

8.90 Geckos are known for their ability to climb smooth vertical walls or windows. Recent research has shown that this unusual trait results from dispersion forces between the surface and the tips of tiny hairlike setae an the Gecko’s feet. Many materials science and engineering groups are working to develop tapes and other adhesives designed to mimic this behavior. Do a web search to find information about such efforts and write a short summary explaining how one resulting adhesive is related to ideas we explored in this chapter.

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Chapter 8 Solutions

Chemistry for Engineering Students
Ch. 8 - How many solid forms of elemental carbon are...Ch. 8 - Why is the C 60form of carbon called...Ch. 8 - What property of diamond leads to the most...Ch. 8 - Which variables must be controlled and in what...Ch. 8 - What is the relationship between the structures of...Ch. 8 - Use the web to look up information on nanotubes....Ch. 8 - Use the web to look up the experimental conditions...Ch. 8 - That is the difference between an amorphous solid...Ch. 8 - Define packing efficiency.Ch. 8 - 8.10 Using circles, show that a cubic structure...Ch. 8 - 8.11 Calculate the packing efficiencies for both...Ch. 8 - 8.12 Explain why hcp and ccp structures have the...Ch. 8 - 8.13 What is the coordination number of atoms in...Ch. 8 - 8.14 Explain why graphite is described as having a...Ch. 8 - 8.15 Polonium is the only metal that forms a...Ch. 8 - 8.16 Iridium forms a face-centered cubic lattice,...Ch. 8 - 8.17 Europium forms a body-centered cubic unit...Ch. 8 - 8.18 Manganese has a body-centered cubic unit cell...Ch. 8 - 8.19 The spacing in a crystal lattice can be...Ch. 8 - 8.20 How many electrons per atom are delocalized...Ch. 8 - 8.21 One important physical property of metals is...Ch. 8 - 8.22 The sea of electrons model is not generally...Ch. 8 - 8.23 How does the sea of electrons model of...Ch. 8 - 8.24 What is the key difference between metallic...Ch. 8 - 8.25 Draw a depiction of the band structure of a...Ch. 8 - 8.26 In term of band theory what is the difference...Ch. 8 - 8.27 The conductivity of semiconductor increases...Ch. 8 - 8.28 Use the web to find out what a “IIIV”...Ch. 8 - 8.29 Explain how doping affects the electronic...Ch. 8 - 8.30 What type of atom is needed as a dopant in an...Ch. 8 - 8.31 What type of atom is needed as a dopant in a...Ch. 8 - 8.32 Is an n-type semiconductor actually...Ch. 8 - 8.33 How does a p-n junction serve as a...Ch. 8 - Suppose that a device is using a 15.0-mg sample of...Ch. 8 - 8.35 What is an instantancous dipole?Ch. 8 - 8.36 Why are dispersion forces attractive?Ch. 8 - 8.37 If a molecule is not very polarizable, how...Ch. 8 - 8.38 What is the relationship between...Ch. 8 - 8.39 Under what circumstances are ion-dipole...Ch. 8 - 8.40 Which of the following compounds would be...Ch. 8 - 8.41 What is the specific feature of N, O, and F...Ch. 8 - 8.42 What type of intermolecular forces must be...Ch. 8 - 8.43 Identify the kinds of intermolecular forces...Ch. 8 - 8.44 Rank the following in order of increasing...Ch. 8 - 8.45 Describe how interactions between molecules...Ch. 8 - 8.46 What makes a chemical compound volatile?Ch. 8 - 8.47 Answer each of the following questions with...Ch. 8 - 8.48 Why must the vapor pressure of a substance be...Ch. 8 - Which member of each of the following pairs of...Ch. 8 - 8.50 Predict the order of increasing vapor...Ch. 8 - 8.51 Suppose that three unknown pure substances...Ch. 8 - 8.52 Rank the following hydrocarbons in order of...Ch. 8 - 8.53 Draw the meniscus of a fluid in a container...Ch. 8 - 8.54 When water is in a glass tube such as a...Ch. 8 - 8.55 Why is temperature increased to start most...Ch. 8 - 8.56 What is mean by the term chain termination in...Ch. 8 - 8.57 The monomer of polyvinylchloride is H2C=CHCl...Ch. 8 - 8.58 Why are isotactic or syndiotactic polymers...Ch. 8 - 8.59 What are the products of a condensation...Ch. 8 - 8.60 Nylon-6 made from a single monomer: Sketch a...Ch. 8 - 8.61 Distinguish between a block copolymer and a...Ch. 8 - 8.62 Use the web to look up the polymers wed for...Ch. 8 - 8.63 What is the key physical property that...Ch. 8 - 8.64 What conditions would prohibit the use of a...Ch. 8 - 8.65 What happens molecularly in a thermosetting...Ch. 8 - 8.66 What structural characteristics are needed...Ch. 8 - 8.67 Use the web to find out what pencil erasers...Ch. 8 - 8.68 Use the web to find an application where the...Ch. 8 - 8.69 Define the terms substrate and mask in the...Ch. 8 - 8.70 Silicon nitride is a commonly used masking...Ch. 8 - 8.71 Silicon dioxide is also used as a masking...Ch. 8 - 8.72 In what way(s) are wet etching and plasma...Ch. 8 - 8.73 Estimate the number of atoms that would have...Ch. 8 - 8.74 An important category of MEMS devices is...Ch. 8 - 8.75 Using pentagons, draw arrangements that...Ch. 8 - 8.76 Using circles, draw regular two-dimensional...Ch. 8 - 8.77 What is the difference between a bonding...Ch. 8 - 8.78 Describe how the combination of atomic...Ch. 8 - 8.79 Most gaseous compounds consist of small...Ch. 8 - 8.80 Why are dipole—dipole forces typically...Ch. 8 - 8.81 Carbon tetrachloride (CCl4) is a liquid at...Ch. 8 - 8.82 Explain from a molecular perspective why...Ch. 8 - 8.83 A substance is observed to have a high...Ch. 8 - 8.84 Suppose that three unknown pure substances...Ch. 8 - 8.85 If shown structures of monomers that might...Ch. 8 - 8.86 Why is there no isotactic or syndiotactic...Ch. 8 - 8.87 Use the vapor pressure curves illustrated...Ch. 8 - 8.88 Cylinders of compressed gas are equipped with...Ch. 8 - 8.89 The following data show the vapor pressure of...Ch. 8 - 8.90 Geckos are known for their ability to climb...Ch. 8 - 8.91 If you puce 1.0 L of ethanol (C2H3OH) in a...Ch. 8 - 8.92 An environmental engineering team is brought...Ch. 8 - 8.93 Do a web search to find out how p- and n-type...Ch. 8 - 8.94 Hydraulic fluids are liquids moving in a...Ch. 8 - 8.95 It is possible to make syndiotactic...Ch. 8 - 8.96 A business manager wants to provide a wider...Ch. 8 - 8.97 The doping of semiconductors can be done with...Ch. 8 - 8.98 If you know the density of material and the...Ch. 8 - 8.99 If a pin is run across a magnet a number of...Ch. 8 - 8.100 You go into the laboratory to look for a...Ch. 8 - 8.101 A materials engineer, with an eye toward...Ch. 8 - 8.102 How is polarizability related to the...Ch. 8 - 8.103 Cryolite (Na3AlF6) is used in refining...Ch. 8 - Use rise web to look up the percentage of dopant...Ch. 8 - 8.105 Use the web to look up the percentage of...

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