15.0 Final mass (g) 3.9 1.9 3.8 Which brand contained the highest percentage of water? Do you consider that water content is a good guide to the relative value of different dog foods? What other factors might be important? Heinemann Chemistry 2 4th edition Enhanced Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) 1 Worked solutions to student book questions Chapter 2 Analysis by mass A4. a b 19.8 − 3.9 100 = 80% × 19.8 1 7.4 −
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Chapter 1 MULTIPLE CHOICE QUESTIONS Topic: Atomic Orbitals 1. A) B) C) D) E) In quantum mechanics a node (nodal surface or plane) is: a place where Ψ is negative. a place where Ψ is positive. a place where Ψ = 0. a place where Ψ2 is large. a place where Ψ2 is negative. Ans: C Topic: Atomic Orbitals‚ Molecular Orbitals 2. When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule‚ how many molecular orbitals are formed? A) 1 B) 2 C) 3 D) 4 E) 5 Ans:
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Kayla Adkins Forensic Chemistry Exam 2 I have been honest and observed no dishonesty. 1. In specific detail‚ describe a published procedure for the definitive identification of Heroin utilizing gas chromatography-mass spectroscopy (GCMS). Heroin is a white crystalline powder with no odor and a bitter taste. It is a derivative of morphine in that the –OH (hydroxyl group) is replaced by an acetyl group‚ -OCOCH3 and has a molecular formula is C21H23NO5 with a molecular weight of 369.42
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Chapter 17—Alcohols and Phenols SHORT ANSWER Drawing Instructions: Draw structures corresponding to each of the given names. 1. Draw: cis-4-tert-butylcyclohexanol ANS: 2. Draw: 3-methyl-2-buten-1-ol ANS: 3. Draw: 2-phenyl-2-propanol ANS: 4. Draw: glycerol ANS: 5. Draw: 2‚ 4‚ 6-trinitrophenol ANS: IUPAC Naming Instructions: Provide proper IUPAC names. 6. Name: ANS: (E)-2-ethylbut-2-en-1-ol 7. Name: HOCH2CH2OH ANS:
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neutralization reactions and others. Transfer of heat is a major theme of thermodynamics‚ the science of heat exchange (or energy exchange). Q: Why it is important to know the quantity of heat (energy) involved in a chemical reaction? Answer: when chemical reaction takes place the rearrangement of atoms takes place and some bonds have to be broken (energy is needed) and new bonds form (energy is released) we can learn about the strength of the bonds‚ we can also predict whether the reaction
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Assessment 7 Question 1 of 12 The equilibrium constant Kp for the reaction CO(g) + Cl2(g) ↔ COCl2(g) is 5.62 x 1035 at 25°C. Calculate ΔGf° for COCl2 at 25°C. (ΔGf° for CO(g) = –137.3 kJ/mol at 25°C) PRIVATE "<INPUT TYPE=\"radio\" NAME=\"null_12_0\" VALUE=\"3\" DISABLED>" MACROBUTTON HTMLDirect A. –66.7 kJ/mol PRIVATE "<INPUT TYPE=\"radio\" NAME=\"null_12_0\" VALUE=\"1\" DISABLED>" MACROBUTTON HTMLDirect B. 188 kJ/mol PRIVATE "<INPUT TYPE=\"radio\" NAME=\"null_12_0\"
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Periodically Puzzling Here are some questions about the elements‚ their properties‚ and periodicity. In each case‚ the correct answer is the name of an element (one of the two given). Write the answer in the appropriate space at the right‚ placing the first letter in the first blank. There are more than enough blanks to fit either element name‚ so the number of letters in the name cannot be used as a clue. When the puzzle is complete‚ the Periodic Law will be displayed in the highlighted column
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The theory of personal space proposes that you and I feel uncomfortable when others get too close in certain situations. This discomfort can‚ says the theory‚ be measured by increased heart rate‚ blood pressure or skin perspiration. The research problem is that to measure these things we have to hook a subject up to some device‚ and they thus know they are being studied. Their behavior might not be natural. To test the theory and solve this problem‚ the following was done: A study by Middlemist
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CHEMISTRY OF NICOTINE Date Submitted: March 17‚ 2010 Introduction Tobacco has a long history and has had a significant impact since first introduced to Western society in the 16th century. There is evidence that Native Americans were using tobacco long before the 16th century. They smoked through a pipe for special religious and medical purposes but the worldwide spread of tobacco was initiated as a result of European discovery by Spanish‚ Portuguese and French explorers.(1‚2) Christopher
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The local media‚ especially the local dailies‚ have been replete with reports of snatch thefts. The barrage of media reports has caused more than a sense of anxiety‚ it has caused fear and panic among residents. Recently‚ there has been a spate of snatch thefts in our area. Snatch thefts tend to escalate during festive seasons and holidays. Hotspots of snatch thefts are quiet and deserted areas such as residential areas‚ by the roadside‚ in lifts and around the bank. Snatch thieves choose their
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