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Topic: Temperature & Percent Error & Density again Do Now: Look at test objectives

Topic: Temperature & Percent Error & Density again Do Now: Look at test objectives. Temperature. Scientifically speaking …. The definition of temperature: Temperature is measure of average kinetic energy of particles in system. Absolute Zero.

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Topic: Temperature & Percent Error & Density again Do Now: Look at test objectives

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  1. Topic: Temperature & Percent Error & Density again Do Now: Look at test objectives

  2. Temperature Scientifically speaking … The definition of temperature: Temperature is measure of average kinetic energy of particles in system

  3. Absolute Zero • Zero on the Kelvin scale: point at which all matter is said to stop moving

  4. World’s Record Cold Temperatures Date ˚F ˚C World (Antarctica) Vostok II 7/21/1983 –129 –89 Verkhoyansk, Russia (Siberia) 2/7/1892 –94 –70 Asia Oimekon, Russia 2/6/1933 –90 –68 Greenland Northice 1/9/1954 –87 –66 N.A. Snag, Yukon, Canada 2/3/1947 –81 –63 U.S. Prospect Creek, Alaska 1/23/1971 –80 –62 U.S. (other than AK) Rogers Pass, Mont. 1/20/1954 –70 –56.5

  5. Conversion formulas How can we convert from one temperature scale to another? K = °C + 273 (more precisely 273.15) °C = K – 273 [F = (9/5 °C) + 32]

  6. accepted value use absolute value – answer always positive Percent Error measured value – accepted value x100%

  7. Student A (g/cm3) Student B (g/cm3) Student C (g/cm3) Trial 1 1.54 1.40 1.70 Trial 2 1.60 1.68 1.69 Trial 3 1.57 1.45 1.71 Data table Students were asked to find the density of sucrose [Sucrose has a density of 1.59 g/cm3]

  8. Advantage of % Error • Makes it easier to compare data, especially if comparing data from different trials

  9. Density Review M D V

  10. Looking at this graph again, what is the density of pyrite? HINT: SLOPEWhat is this graph missing?

  11. Scientific Notation • The number is written as the product of two other numbers: • A number between 1 and 10 (not 10) • and • A power of 10

  12. Converting conventional to scientific notation For numbers  1, the exponent will be positive. Count how many places the decimal is moved. 329  3.29 X 102

  13. Converting conventional to scientific notation For numbers between 0 and 1, the exponent will be negative. Count how many places the decimal is moved. 0.00045  4.5 X 10-4

  14. Converting scientific to conventional notation If the exponent is positive, the number  1, so move the decimal point right. 3.784 X 105  378400

  15. Converting scientific to conventional notation If the exponent is negative, the number is between 0 and 1 so move the decimal point to the left.  2.75 X 10-3 0.00275

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