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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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## 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)**Kelvin temperature scale**• Based on absolute zero • Absolute zero is when all motion of atoms stop! 273 + °C = K**Accuracy**• How close a measured value is to the accepted value or target • Precision • How close a series of measurements are to one another**Accurate = means close to the bull’s eye**Precise = means shots are close to one another**Practice**• Density of water is 1 g/mL • Student one • Accurate? • Precise? • Student two • Accurate? • Precise?**Percent Error**• Ratio of error to the accepted value • Can be positive or negative • We like to within 5% **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?**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?**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?**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.**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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