Chem19KMT - Module 19 — Kinetic Molecular Theory 1...

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Unformatted text preview: Module 19 — Kinetic Molecular Theory 1 Calculations In Chemistry * * * * * Module 19 – Kinetic Molecular Theory Module 19 – Kinetic Molecular Theory......................................................................487 Lesson 19A: Squares and Square Roots ................................................................................487 Lesson 19B: Kinetic Molecular Theory.................................................................................495 Lesson 19C: Converting to SI Base Units..............................................................................498 Lesson 19D: KMT Calculations..............................................................................................501 Lesson 19E: Graham’s Law....................................................................................................513 For additional modules, visit www.ChemReview.Net Module 19 — Kinetic Molecular Theory ©2011 ChemReview.net v. 1h Page 487 Module 19 — Kinetic Molecular Theory Lesson 19A: Squares and Square Roots Timing : Complete this lesson before calculations involving root mean square velocity or Graham’s law. Prerequisites : Review Module 1 on Scientific Notation if needed. Pretest : If you solve all of these problems correctly, skip to Lesson 19B. Express your final answers in scientific notation. Answers are at the end of this lesson. 1. Solve without a calculator: (7.0 x 10 6 ) 2 = 2. Use a calculator. (9.5 x 10 ─ 4 ) 2 = 3. Do not use a calculator. The square root of 1.6 x 10 ― 11 = 4. You may use a calculator for all or part of this problem. (4.9 x 10 5 ) 1/2 = * * * * * Squaring Numbers Most calculators have an x 2 or x^2 key, but different calculators use keys in different sequences. To test using the square key, cover the answer below and do this calculation in your head. 5 2 = ________ * * * * * 5 2 = 25. Now, using the calculator you will use on tests, write a key sequence that is used to square 5: ________________________________________. To test your key sequence, first solve in your head, then use your sequence to solve the following problems. Make sure that you get the same answers both ways. a. 6 2 = _____ b. 9 2 = _____ c. Do two ways on keys: 12 2 = _____ . * * * * * Answers : a. 36 b. 81 c. 12 x 12 = 144 Note that all of the calculations above can be done at least two ways. Always try to do calculator calculations in two different ways to check your calculator use. Taking Exponential Notation to a Power Without a Calculator 1. Memorize this rule: To take exponentials to a power, multiply the exponents. (As used here, power and exponent have the same meaning.) Examples : (10 3 ) 2 = 10 6 (10 ― 5 ) 2 = 10 ― 10 Without a calculator, write answers to these, then check below....
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This note was uploaded on 11/16/2011 for the course CHM 1025 taught by Professor J during the Summer '09 term at Santa Fe College.

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Chem19KMT - Module 19 — Kinetic Molecular Theory 1...

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