1. Bell Ringer
Round kg to 3 sig figs.
What is the rule for addition and subtraction?
What is the rule for multiplication and division?
(12 x )
(3.24 x 5.123)

2. Elements Quiz
Period
9/9 Tuesday
2nd 55
3rd 66
4th 63
5th 56
6th 51

3. Elements Quiz You need a pen or pencil
Once done with your quiz, please take out your sig figs calculations hw

4. Measurements Conversion factors Significant figures Density
Metric (SI) units
Prefixes
Uncertainty
Length
Mass
Volume
Conversion
factors
Significant
figures
Density
Problem solving with
conversion factors

5. SI Base Units
Base Quantity Name Symbol Length meter m Mass kilogram kg Volume Liter L Time second s temperature Kelvin K amount of substance mole mol electric current ampere A luminous intensity candela cd

6. Measurements Conversion factors Significant figures Density
Metric (SI) units
Prefixes
Uncertainty
Length
Mass
Volume
Conversion
factors
Significant
figures
Density
Problem solving with
conversion factors

7. Exact Numbers
Considered to have an infinite number of significant figures
Ex. “There are 4 quarts in a gallon”, the number 4 would be exact
Ex. “A is two times as large as B”, the number 2 would be exact
Usually involve counted values, conversion factors, or definitions

8. Measurements Conversion factors Significant figures Density
Metric (SI) units
Prefixes
Uncertainty
Length
Mass
Volume
Conversion
factors
Significant
figures
Density
Problem solving with
conversion factors

9. Prefixes You must know: kilo = 1000 centi = 1/100 milli = 1/1000
Useful in future:
Mega = 106
nano = 10-9
pico = 10-12

10. Fill in the missing numbers
1 kg = ____ g
1g = ____ cg
1g = ____ mg
1 km = ____ m
1 m = ____ cm
1 m = ____ mm
1 cm = ____ mm
1L = ____ mL
1mL = ____ cm3

11. Measurements Conversion factors Significant figures Density
Metric (SI) units
Prefixes
Uncertainty
Length
Mass
Volume
Conversion
factors
Significant
figures
Density
Problem solving with
conversion factors

12. Dimensional Analysis (aka conversions)
Def: method of calculation utilizing a knowledge of units where conversion factors are used to manipulate units
The conversion factors are simple ratios
Ex: 1 hr = 60 min, 1 mol = x 1023 atoms

13. Steps to Dimensional Analysis
What data are we given?
What quantity do we need (our unknown)?
What conversion factors are available to take us from what we are given to what we need?
[perform calculation]
Does our answer make sense?

14. Factor Label Method (used in all chemistry and physics classes
Factor Label Method (used in all chemistry and physics classes. Save yourself lots of grief and learn it now!)
Remember these two ideas:
Any number can be multiplied by 1 without changing its value.
Multiplying by a conversion factor is like multiplying by 1 because the numerator and the denominator are equal.
Ex.

15. Let’s do some together!
Ms. B’s college ring weighs ______ g. How many kg is this?
Convert 2 L of Monster to mL.
Convert 2.5 kg to mg.

16. Crash Course Chemistry
3:07-5:18

17. Whiteboard Race
How many L is 36.2 mL?

18. Whiteboard Race
How many teaspoons are in a liter bottle of Sprite? 1tsp = 4.93mL

19. Whiteboard Race
Wes speeds down the hallway at a whopping 4 miles per hour. How many km/s is he travelling?

20. Whiteboard Race
You scrounge up the money to by a Jaguar (the car, not the animal…). You’re going down the highway with your speedometer reading 47 km/hr. Are you speeding if the speed limit is 60 miles/hr?

21. Whiteboard Race
In a primitive barter society, the following rates of exchange exist:
1 fot = 5 vum 2 sop = 3 tuz
4 bef = 3 tuz 9 fot = 2 bef
A woman has 4 sop and wants to convert all her possessions into vum. How many vum can she trade for?

22. Exit Ticket (turn in on the way out)
Convert 8.4x10-2cm to mm.
Convert 5 ft to cm. (1 in = 2.54 cm)