Christina Park 2/14/12 pd.3 Chapter 11 Notes I. Measuring Matter A. Counting Particles number of unit for counting is always constant. a. What is a mole? mole (mol): the SI unit used to measure the amount of a substance‚ number of representative particles. representative particle: any kind of particle such as atoms‚ molecules‚ formula units‚ electrons‚ or ions. Avogadro’s number: 6.022 136 7 x 10²³‚ volume of one mole of a gas determined by Amedeo Avagadro in 1811. B. Converting
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x − 1) dx = 0‚ 0 < x < π (h) cos (i) (x + yey/x )dx − xey/x dy = 0‚ y(1) = 0 [Hint: Think homogeneous.] 4. Suppose the differential equation dP = (k cos t)P‚ dt is a model of the human population P (t) of a certain community‚ where k is a positive constant. Discuss a (non-morbid) interpretation for the solution of this equation. In other words‚ what kind of population do you think it describes? [Actually solving the equation is not helpful.] 5. Write down a differential equation for the velocity v(t)
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system is disturbed through application of a particular stress‚ the system shifts to the direction which relieves the stress. The shifting equilibrium experiment will further explain this concept and discuss the reaction quotient and equilibrium constant. RESULTS AND DISCUSSION Seven test tubes were filled with 2.0 mL of 0.10 M Cu(NO3)2 and into each test tube‚ 1.0 mL of 0.10 M NaOH was added. Using a centrifuge‚ the precipitate was settled and the supernate was discarded. 3.0 mL of distilled
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of cyclic AMP in the tissue : the reaction seems to obey simple saturation kinetics‚ a n apparent intracellular K d for cyclic AMP has been evaluated as 330 nM. The findings are consistent either with a real difference in the intracellular binding constant as compared to that measured in vitro (28 nM) or with the fact that the cyclic nucleotide in the cell may not all be available for the kinase protein receptors. They also suggest that the method described may prove useful for studying any possible
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rapidly than conventional ovens. Q3. Soy sauce weighing 74.6 g was heated in an oven to constant mass. The final mass was 14.2 g. What percentage of water did the sauce contain? A3. Mass water = 74.6 – 14.2 = 60.4 g 100 60.4 100 mass of water = × = 80.97 = 81.0% × %Water = mass of sample 1 74.6 1 (three significant figures) Q4. Three brands of dog food were heated and dried to constant mass. The data recorded are shown in Table 2.2. Table 2.2 Determination of water content
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1 mole of any substance can be defined as: Amount of a substance that contains as many particles (atoms‚ molecules or ions) as there are atoms in 12 g of the 12C isotope Avogadro number or Avogadro constant (NA); equal to 6.022 × 1023 particles Example − 1 mole of oxygen atoms = 6.022 × 1023 atoms 1 mole of carbon dioxide molecules = 6.022 × 1023 molecules 1 mole of sodium chloride = 6.022 × 1023 formula units of sodium chloride Molar mass of a substance can be defined as: Mass of one mole
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S. 5.2 – The Mole The mole: - - - - Ex. - Molar mass (g/mol): - - - Ex. |Element |Atomic mass shown on Periodic |Molar mass of element | | |table | | |N |14.0067 |14.0067 g
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Week 7 MA 3110 11/5/2012 Pg. 485 Q: 8 Number in group 129 805 n’s Number experiencing insomnia 19 13 x’s a= 0.05 (a) p-bar= (x1+x2)/(n1 + n2) 0.034261242 n1 = 129 (b) z= (p-hat diff)/sqrt(p-bar*q-bar*(1/n1+1/n2)) 7.601787316 n2 = 805 q-hat’s (c) za/2 = ± 1.96 p1-hat= 0.147286822 0.852713178 (d) P-value= 2.93099E-14 p2-hat= 0.016149068 0.983850932 Q: 10 (a) E= 0.06177357
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The Pentium Flaw NT1110 Computer Structure and Logic Unit 2 Analysis The Pentium floating-point unit flaw only occurred on some models of the original Pentium microprocessor chip. Any of the Pentium family processors with a clock speed of at least 120 MHz is new enough not to have the bug. On the affected microprocessor models‚ the Intel Processor Frequency ID Utility checks for the floating-point unit flaw. Professor Thomas Nicely sent an email describing the flaw that he had discovered
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AS TRANSITION COURSE SUMMER 2012 PART 1: MEASURING AMOUNT OF SUBSTANCE MASS VOLUME MOLAR MASS AVOGADRO [pic] CONCENTRATION ATOM ION MOLECULE COURSE OUTLINE OCR Chemistry A Unit 1 – Autumn Term 2012 • Atoms and Electron Structure • Moles‚ Equations and Acids • Structure and Bonding • Redox‚ Group 2 and Group 7 Unit 1 Exam – January 2013 – 1 hour – 90 UMS – 30% of total Unit 2 – Spring Term 2013 • Basic Concepts
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