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Unit 1 Loose Ends and Test Review

Unit 1 Loose Ends and Test Review. Objective A (remember, the objective refer to the Study Guides) http://www.magazine-agent.com/officials-logic-problems/magazine. Look at the following numbers. How easy would it be to memorize this list and regenerate it in a week or so on a quiz?

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Unit 1 Loose Ends and Test Review

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  1. Unit 1 Loose Ends and Test Review

  2. Objective A (remember, the objective refer to the Study Guides)http://www.magazine-agent.com/officials-logic-problems/magazine • Look at the following numbers. How easy would it be to memorize this list and regenerate it in a week or so on a quiz? • 1, 3, 5, 11, 21, 43, 85, 171, 341, 683, 1365, 2731, 5461, 10923, 21845 • Pretty hard? Pretty Easy? Why? • Easy huh? OK, what’s the next number in the sequence? How about the next 5 numbers?

  3. 1, 3, 5, 11, 21, 43, 85, 171, 341, 683, 1365, 2731, 5461, 10923, 21845http://www.antiqueradiomuseum.org/RR%20Rule%20Book%20for%20CMSP&P%20RR.jpg • The numbers don’t seem to follow any kind of pattern. • But, what if you knew a rule? It wouldn’t just be memorization then. • OK, good point! The rule is: • Start with 1. • Double and add 1. • Double and subtract 1. • And so on. You just wish it was that EASY!

  4. Learn HOW to do the problem; don’t just memorize the answer!http://familyfun.go.com/Resources/printable-previews/previews/beaver_memorygame_august2.jpg Don’t • Doesn’t “knowing the rule” make the list easier to memorize? • You don’t have to memorize a bunch of unrelated numbers. • IF YOU KNOW the rule, you can generate the number list on the test easily. Anytime! Anywhere!

  5. Can you make sense out of NONSENSE? • Force Hour Upon Neigh • Koran Force Cis Shun • Heaven Fodder Count • Ye Brat Anent • Sago Farce Anew • Figured it out yet?

  6. The Gettysburg Addresshttp://www.old-picture.com/defining-moments/pictures/Abraham-Lincoln-Antietam-Battlefield.jpghttp://en.wikipedia.org/wiki/Gettysburg_Address • “Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.” • Being able to look at something new, and make sense of it is an important skill for the rest of this course. Yes, Ms Rackley, I know this was Antietam, but it’s a nice picture.

  7. Objective Ahttp://www.tvgasm.com/newsgasm/Bill-nye.jpg • In Chemistry, when we have numbers, much of the time we do one of three things: • Multiple 2 x 3 • Divide 2 / 3 • Divide 3 / 2 • If you can figure out which operation to do when, you can actually solve the problem. That’s our goal. What would Bill Nye do? Answer: nothing because he just died.

  8. Units TELL you the right ANSWER! • If your units don’t work out right, your answer is wrong. • Don’t just ignore wrong units. It is a big clue for you. • LISTEN to the units!

  9. Qualitative and Quantitative Data • Qualitative (think quality) • These are observations usually. • It’s blue. It’s hot. It’s cool. It’s smells like rotten eggs. • Remember to look for qualitative date when you do your lab experiments. • Quantitative (think quantity or amount) • These are the numbers you measure. • 5.0 g of baking soda. 2L of diet Coke. 4.5 moles of CO2. • Remember to record quantitative data in your lab notebook when you do experiments too.

  10. Objective C…Error • We will discuss error primarily in our labs. Always include a discussion of any errors that happened in your experiment in your “Analysis of Data” section of your lab report. • What kind of errors can you have in your labs? • Two kinds: • Random • Systematic

  11. Objective C…Errorhttp://www.budapesthotels.com/sitepic/error_button.pnghttp://images.intomobile.com/wp-content/uploads/2009/06/easy-button.jpg • Random errors are mistakes. You can take care to reduce or eliminate random errors. These usually come from being unprepared (not reading the lab prior to doing it), rushing to get done, and careless errors (like forgetting to do a step). • Systematic errors are errors that are present in your system. You can’t do anything about these. If your data is precise, but not accurate this might indicate that you had systemic error. Easy Button Error Button

  12. Objective d…Significant Figures • When you take measurements in Chemistry class or in lab, you have to worry about how many significant figures (usually abbreviated as sig figs) you have. • What are sig figs? • All the digits you can read and the first one you can estimate. Between 7.1 and 7.2, so record as 7.15. All 3 digits are significant, because you read the first 2 and estimated the last 1.

  13. Objective d…Significant Figureshttp://www.freefoto.com/images/2000/98/2000_98_1---Number-Zero_web.jpg Significant? Maybe or maybe not! • However, if you didn’t measure it, there are rules for figuring out how many sig figs something has. • RULE #1. All non-zero digits are significant. • So that means that the only thing you have to determine is whether or not the zeros are significant.

  14. Objective d…Significant Figures • Rules are in the study guide. • 2. Zeros between non zero digits are significant. So, 2.003 has 4 sig figs. • 3. Zeros at the end of a number AND to the right of the decimal point are significant. So, 1.000 has 4 sig figs. • 4. Zeros at the beginning of a number are never significant. So, 0.00034 has 2 sig figs. • 5. Exact measurements or exact quantities have an unlimited amount of sig figs. Example 1 hour = 60 min. “1” and “60” both have an unlimited number of sig figs.

  15. Objective d…Significant Figures • Adding/Subtracting • Answer cannot have more sig figs AFTER the decimal point than the number with the lowest number. • Ex: 2.1 + 2.22 + 2.345 = 6.665 • Answer can only have 1 digit after the decimal • Correct answer = 6.7 • Multiplying/Dividing • Answer cannot have more sig figs than the number with the lowest number of sig figs. • Ex: 2.22 x 2.345 = 5.2059 • 2.22 has 3 sig figs and 2.345 has 4 sig figs. Answer can only have 3 sig figs. • Correct answer = 5.21 ±1 sig figs off is usually OK. If answer should have 4 sig figs and you have 3, 4 or 5, I won’t mark it wrong.

  16. Objective d…Significant Figureshttp://www.tvguide.com/celebrities/stuart-scott/214001 • But isn’t 50 and 50.0 and 50.00 and even 50.000 the exact same number? • Maybe, outside of chemistry class, but not in here. • Let me explain. 50 ≠ 50? Wha-hap-happen?

  17. Objective d…Significant Figures • 50 means that your measurement is somewhere between 49 and 51. • 50.0 means that your measurement is somewhere between 49.9 and 50.1 • 50.00 means that your measurement is somewhere between 49.99 and 50.01 • 50.000 means that your measurement is somewhere between 49.999 and 50.001 The more sig figs in your measurement, the more confidence you have that it’s “exactly” 50 mL or g.

  18. Objective f…Densityhttp://www.stevespanglerscience.com/img/cache/bcb9b8db117ee64376aedaf7af3595ca/sevenlayer-2-51908.jpg Higher density layers on the bottom and lower density layers on the top. Is oil more or less dense than water? D = m / V

  19. Objective g…Ice Floatshttp://www.dharma.org/ims/images/pi_ice_on_pond.jpg • Why does ice float? • Why is this a good thing? • Ice is actually kind of strange. Actually water is a very unique compound. • Most substances are more dense as a solid than they are as a liquid. • Ice is an exception.

  20. Objectiveh: Measure your Kinetic Energy: Take Your Temperature!http://www.avogadro.co.uk/miscellany/t-and-p/thermometers.gif • Kelvin temperature was defined to be a measure of the kinetic energy of the sample of matter. 0K is ABSOLUTE zero. • A sample of matter at 300K has twice as much kinetic energy as a sample of matter at 150K. Temperature is directly proportional to kinetic energy. • You must remember how to convert from °C to K and vice versa. It WILL be on the test.

  21. The End What is next? Unit 2: Chapter 5, 28, 13, and 14. We will do ALL of Chapter 5, but only portions of the other 3 chapters.

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