PS01_Chap01a

PS01_Chap01a - Brown/Holme Chemistry for Engineers 1/e 1-1...

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Brown/Holme Chemistry for Engineers 1/e 1-1 Chapter 1 Problems & Exercises Insight into Aluminum 1.2 What properties of aluminum might cause you concern if you had to use the aluminum tableware that Napoleon employed to impress his guests? ANS Al tableware would be very susceptible to rapid oxidation and would have to be polished frequently. 1.4 Use the web to determine the amount of aluminum used in the US in a single year. What is the primary use for this material? ANS The are radical changes in the amount of aluminum produced in the US as more production is shifted out of the US. Utilize a world wide web search engine to acquire the reference. Primary use for the material is transportation. 1.6 Use the web to determine the difference in how much aluminum is recycled in states where there are deposits on aluminum cans versus states where recycling is voluntary? What is the most reliable way to estimate this value? What uncertainty is there in the estimate? ANS Recycling rates have steadily declined in recent years; utilize a world wide web search engine to acquire the most current reference.
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Brown/Holme Chemistry for Engineers 1/e 1-2 The Study of Chemistry 1.8 Which of the following items are matter and which are not? (a) a flashlight (b) sunlight (c) an echo (d) air at sea level (e) air at the top of Mount Everest ANS a) matter, b) not matter, c) not matter, d) matter, e) matter 1.10 How can a liquid be distinguished from a fine powder? What type of experiment or observation might be undertaken? ANS Experiments related to the physical properties of the liquid and fine powder would prove useful. These could include properties such as surface tension, flow, and behavior in a high static electricity environment. 1.12 Do the terms element and atom mean the same thing? If not how do they differ? ANS No, an element is a pure substance, but the natural occurring form of the element may contain two atoms. An example of this is elemental nitrogen (N 2 ). In this case the element has two atoms. 1.14 Why do physical properties play a role in chemistry if they do not involve any chemical changes? ANS Physical properties can be used to identify substances in qualitative and quantitative analysis and can provide a wide range of useful information.
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Brown/Holme Chemistry for Engineers 1/e 1-3 1.16 Identify the physical and chemical properties noted in the following statement: When a piece of iron is exposed to air it corrodes, forming a layer of red-brown powder that flakes off and is denser than the original material. ANS Physical properties include the flaking of the powder and density comparison. The chemical properties here is the reaction to form the iron oxide(s). 1.18
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This note was uploaded on 10/02/2010 for the course CHEM chem 154 taught by Professor A.y during the Fall '10 term at UOIT.

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PS01_Chap01a - Brown/Holme Chemistry for Engineers 1/e 1-1...

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