1. Unit Conversions MEASUREMENT
Dimensional Analysis, Scientific Notation, Significant Figures, Density, Percent Error

2. A. SI Prefix Conversions
Mnemonic
Factor
Kilo
Kids
103
Hecto
Have
102
Deca
Dirty
101
BASE Unit
mouths,lips,gums
100
deci
drinking
10-1
centi
chocolate
10-2
milli
milk
10-3
move left
move right

3. Chemistry Reference Table - Table C
How many to the right? 6 9 12
micro- 
10-6
nano- n
10-9
pico- p
10-12

4. A. SI Prefix Conversions
0.2
1) 20 cm = ______________ m
2) L = ______________ mL
3) 45 m = ______________ nm
4) 805 dm = ______________ km 32
45,000
0.0805

5. Packet page 3

6. The Distance From the Sun to the Earth
Scientific Notation
A short-hand way of writing large numbers without writing all of the zeros.
The Distance From the Sun to the Earth
93,000,000

7. Step 1 93,000,000 = 9.3000000 Move decimal left
Leave only one number in front of decimal
93,000,000 =

8. Step 2
Write number without zeros
93,000,000 = 9.3

9. Step 3 7 93,000,000 = 9.3 x 10 Count how many places you moved decimal
Make that your power of ten
93,000,000 = 9.3 x 10 7

10. The power of ten is 7 because the decimal moved 7 places.
93,000,000 = 9.3 x 10 7

11. 93,000, Standard Form
9.3 x Scientific Notation

12. Practice Problems Packet - Page 4, 1-10 top

13. Move the decimal to the right.
Write in Standard Form
Move the decimal to the right.
6.27 x 106
9.01 x 104
6,270,000
90,100

14. Practice Problems Packet - Page 4, 1-10 bottom

15. Homework Page 5

16. DETERMINING SIGNIFICANT FIGURES
Crunching numbers with accuracy and precision

17. BEFORE YOU CAN CRUNCH You must know which digits are significant
Because they are going to control the number of digits in a calculated figure
11/30/2018

18. WHAT IS A SIGNIFICANT FIGURE?
Significant figures are all the digits in a measurement that are known with certainty plus a last digit that must be estimated.
11/30/2018

19. Page 6

20. Now you try How many significant digits in each of the following:
12 apples
3000 m
69 people
11/30/2018

21. Answers 1.034 s - 4 significant figures
g significant figures
12 apples exact number
3000 m significant figure
69 people exact number
11/30/2018

22. Packet Page 7

24. Homework Packet Page 8

25. D. Density V = 825 cm3 M = DV D = 13.6 g/cm3 M = (13.6 g/cm3)(825cm3)
An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass.
GIVEN:
V = 825 cm3
D = 13.6 g/cm3
M = ?
WORK:
M = DV
M = (13.6 g/cm3)(825cm3)
M = 11,200 g

26. D. Density D = 0.87 g/mL V = M V = ? M = 25 g V = 25 g 0.87 g/mL
A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid?
GIVEN:
D = 0.87 g/mL
V = ?
M = 25 g
WORK:
V = M D
V = g
0.87 g/mL
V = 29 mL

27. Packet Page 9-10