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Warm Up 09/11

Warm Up 09/11. 1. You measure an object and find its length to be 2.48 cm. The actual length according to the package is 2.5 cm. Find the error: Find the percent error:

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Warm Up 09/11

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  1. Warm Up 09/11 1. You measure an object and find its length to be 2.48 cm. The actual length according to the package is 2.5 cm. • Find the error: • Find the percent error: 2. If 50 grams of carbon dioxide react completely with 30 grams of water to form carbonic acid, what is the mass of carbonic acid formed?

  2. Warm Up 1. You measure an object and find its length to be 2.48 cm. The actual length according to the package is 2.5 cm. • Find the error: 2.5 - 2.48 = 0.02 • Find the percent error: (0.02/2.5) x 100 = 0.8 % 2. If 50 grams of carbon dioxide react completely with 30 grams of water to form carbonic acid, what is the mass of carbonic acid formed? 50 + 30 = 80 grams

  3. Quick Elements “Quiz” Name the element:Identify the symbol: Fe Nitrogen Ag Fluorine Cu Helium Pb Hydrogen S Zinc

  4. Quick Elements “Quiz” Name the element:Identify the symbol: Fe: Iron Nitrogen: N Ag: Silver Fluorine: F Cu: Copper Helium: He Pb: Lead Hydrogen: H S: Sulfur Zinc: Zn

  5. Chemistry 3.3 -3.5

  6. International System of Units(SI) • Revised version of the metric system • Purpose: so that scientists use standard units of measurement • Important when sharing experimental methods, following a method, and noting results

  7. Length • SI unit for Length : meter (m)

  8. Volume The space occupied by a sample • SI Unit : Liter (L)

  9. Mass The amount of matter an object contains • SI unit for mass: kilogram (kg)

  10. Commonly used Prefixes in the Metric system You must memorize and be able to use the prefixes indicated in red!!!!

  11. Lets practice You should know that kilo means 1000 times greater. k = 1000 1 kg is equal to how many grams? 1 kg = x g

  12. Lets practice You should know that kilo means 1000 times greater. k = 1000 1 kg is equal to how many grams? 1 kg = 1000 g

  13. If centi- means 1/100or 10-3 Then 1 cm is equal to how many meters? 1 cm = ? m

  14. If centi- means 1/100or 10-3 Then 1 cm is equal to how many meters? 1 cm = ? m 1 cm = 1/100 m = .01 m

  15. If milli means 1/1000 Then 1 L = ? mL

  16. If milli means 1/1000 Then 1 L = 1000 mL Remember that you have 1000 mL in 1 L, that is where we get the 1/1000!!!

  17. Density • Density ( ρ ): the ratio of the mass of an object to its volume • Density = mass volume ρ= grams L or cm3

  18. Specific Gravity • Comparison of the density of a substance to another substance (typically water) • Hydrometer: Device used to measure specific gravity.

  19. Temperature Scales • Celsius • sets the freezing point of water as 0 ° and the boiling point of water as 100 ° • Includes negative values • Kelvin • °C + 273 = Kelvin • Absolute zero: 0 K = - 273 C° The point when all molecular motion stops!!!! • Fahrenheit

  20. Lets practice Convert 609 K into  Celsius: Convert 25 C into kelvin:

  21. Lets practice Convert 609 K into  Celsius: 609 -273 = 336  C Convert 25 C into kelvin: 25 C + 273 = 298 K

  22. The End!!!

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