Temperature
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Temperature. Measurement of kinetic energy of atoms or molecules. Fahrenheit ( °F). Celsius ( °C) Based on boiling & freezing point of water. Temperature Scales. Water Boils Water Freezes Absolute Zero. 373. 212. 100. 32. 273. 0. - 452. - 273. 0. Kelvin (K).

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Presentation Transcript
Temperature l.jpg
Temperature

  • Measurement of kinetic energy of atoms or molecules


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Fahrenheit (°F)

Celsius (°C)

Based on boiling & freezing point of water

Temperature Scales

Water Boils

Water Freezes

Absolute Zero

373

212

100

32

273

0

- 452

- 273

0

Kelvin (K)


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  • Accuracy

    • How close a measured value is to the accepted value or target

  • Precision

    • How close a series of measurements are to one another


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Accurate = means close to the bull’s eye

Precise = means shots are close to one another


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Practice

  • Density of water is 1 g/mL

  • Student one

    • Accurate?

    • Precise?

  • Student two

    • Accurate?

    • Precise?


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Percent Error

  • Ratio of error to the accepted value

  • Can be positive or negative

  • We like to within 5% 


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Percent Error Practice Problems

1. The boiling point of water is 100°C. During an experiment, water came to a boil at 97°C according to the thermometer that was being used. What is the percent error?


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Percent Error Practice Problems

2. An experiment was performed to determine the density of water. The results of the experiment showed that water had a density of 1.15 g/mL(real value is 1.0 g/mL). What is the percent error?


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Percent Error Practice Problems

3. An experiment was conducted to find the mass of one mole of carbon atoms. The results of the experiment showed that a mole of carbon atoms has a mass of 15.78g. The actual value is 16 grams. What is the percent error?


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Percent Error Practice Problems

4. An experiment performed to determine the density of lead yields a value of 10.95 g/cm3. The actual value for the density of lead is 11.342 g/cm3. Find the percent error.


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Percent Error Practice Problems

5. Find the percent error in a measurement of the boiling point of bromine if the experimental value is 40.6°C and the actual value is 59.35°C.


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