1. Metric System

2. Scientific Notation In science, we deal with some very LARGE numbers:
1 mole =
In science, we deal with some very SMALL numbers:
Mass of an electron = kg

3. Scientific Notation:
A method of representing very large or very small numbers in the form:
M x 10n
M is a number between 1 and 10
n is an integer

4. . 9 8 7 6 5 4 3 2 1
Step #1: Insert an understood decimal point
Step #2: Decide where the decimal must end
up so that one number is to its left
Step #3: Count how many places you bounce
the decimal point
Step #4: Re-write in the form M x 10n

5. 2.5 x 109
The exponent is the number of places we moved the decimal.

6. 0.0000579 1 2 3 4 5 Step #2: Decide where the decimal must end
up so that one number is to its left
Step #3: Count how many places you bounce
the decimal point
Step #4: Re-write in the form M x 10n

7. 5.79 x 10-5
The exponent is negative because the number we started with was less than 1.

8. 4 x 106
Multiply the front numbers then add the exponents
x 3 x 106 12
x 1012
Move the decimal behind the first number
1.2
x 1013

9. Divide the front numbers then subtract the exponents
0.4
x 105
Move the decimal behind the first number 4
x 104

10. SI System Standard International System of measurement – metrics
Has seven base units and many other units derived from these seven

11. Seven Base Units

12. Mass vs Weight Mass is not the same as weight
Mass is the amount of matter in a substance
Weight is a measure of the pull of gravity on the substance
Can you be weightless? Can you be massless?

13. Derived Units
Many other units are used in the metric system, but they are combinations of the base units
Speed - meter per sec (m/sec)
Volume
volume = length x width x height
(m) x (m) x (m) = m3
.001 m3 = 1 liter (L)
1 cm3 = 1ml

14. Prefixes
Metric system utilizes prefixes which indicate multiples of 10 of the unit
kilo k 1000
hecto- h 100
deka da 10
deci d .1
centi c .01
milli m

16. Converting Between Metric Units
3.65 dam = __________cm 2587 mm = __________hm hl = __________cl

17. More Prefixes

18. Use the appropriate prefixes
3 x 106 L
15 x 10-9 g
8 x 108 m
3.5 x 10-6 A
1.46 x 1010 J

19. Temperature Metric unit – Kelvin – not used for measurement
Measured in C (celsius)
K = C
Old system is F (farenheit)
C = 5/9 (F -32)
What is 69 F in C and K?