1. 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. a.Find the error: b.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. a.Find the error: 2.5 - 2.48 = 0.02 b.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: FeNitrogen AgFluorine CuHelium PbHydrogen SZinc

4. Quick Elements “Quiz” Name the element:Identify the symbol: Fe: IronNitrogen: N Ag: SilverFluorine: F Cu: CopperHelium: He Pb: LeadHydrogen: H S: SulfurZinc: 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 1/100 or 10 -3 Then 1 cm is equal to how many meters? 1 cm = ? m

14. If centi- means 1/100 or 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 cm 3

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!!!