Transcript Thu, September 15

Do Now


Complete the Do Now on your Daily Organizer.
Calculate the following:
1.
2.
3.

(4.2 x 10-11) x (8 x 10-5)
(3.15 x 102) x (1.8 x 105)
(5.6 x 1013) / (7 x 10-11)
What do you remember about our class norms,
READY? Take a look at each of the five norms (look
at the wall if you don’t remember them) and tell me
if you think you’ve been upholding the expectations
I set for each of them.
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
15 min
• Review: Sig Figs + Scientific Notation
10 min
• Metric Prefixes
20 min
• Measurement Lab
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
15 min
• Review: Sig Figs + Scientific Notation
10 min
• Metric Prefixes
20 min
• Measurement Lab
Important Dates/Reminders



Homework worksheets were due in the bin BEFORE you
were done with your Do Now! It is now LATE if you have
not turned it in.
Worksheet given to you yesterday is due TOMORROW.
Senior Cook-Out & Car Wash

TOMORROW!
Tell your friends & family! SPREAD THE WORD! 2-5 PM!
 ALL sign-ups are on the board and are confirmed. You were
assigned a time slot but if you want to volunteer more or for more
multiple things, please do!


Senior Movie Night

Voting on a movie in homeroom TOMORROW 
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
15 min
• Review: Sig Figs + Scientific Notation
10 min
• Metric Prefixes
20 min
• Measurement Lab
Significant Figures
•
•
•
How to determine how many you have
Addition and Subtraction rules
Multiplication and Division rules
Determining Significant Figures

RULE #1: Non-zero digits are always significant
 These

are our digits 1-9
RULE #2: There are three types of zeros
 LEADING
 These
are the zeros that come BEFORE any non-zero digit
 CAPTIVE
 These
ZEROS
are the zeros BETWEEN non-zero digits
 TRAILING
 These
ZEROS
ZEROS
are the zeros AFTER all non-zero digits
Determining Significant Figures

RULE #1: Non-zero digits are always significant
 These

are our digits 1-9
RULE #2: There are three types of zeros
 LEADING
 These

are the zeros that come BEFORE any non-zero digit
NEVER SIGNIFICANT
 CAPTIVE
 These

ZEROS
are the zeros BETWEEN non-zero digits
ALWAYS SIGNIFICANT
 TRAILING
 These

ZEROS
ZEROS
are the zeros AFTER all non-zero digits
ONLY SIGNIFICANT WITH A DECIMAL PLACE
Addition & Subtraction
The answer must have as
many decimal places as the
measurement having the
least number of decimal
places.
Addition
Subtraction
12.11
12.11005
18.0
0.0004
+ 1.013
- 1.0
31.123 = 31.1
11.10965 = 11.1
Multiplication & Division
The answer may contain only
as many significant digits
as the measurement with the
least number of significant
digits
Multiplication
3 sigfigs
2 sigfigs
2 sigfigs
Division
1.903
10)19.03
=
2
4 sigfigs
1 sigfig
1 sigfig
How to Convert to S.N.

Step 1: Determine A
 Ignore
all leading and trailing zeros and just look at
your significant digits
 Place

a decimal point so your number is between 1 and 10.
Step 2: Determine n
 Start
at the place you put a decimal point to determine
A and count until you reach the decimal point in your
original number
 For

numbers without an original decimal, count to the end.
Step 3: Put it all together
 Use
this form: A x 10n
Multiplication with S.N.


MULTIPLY the numbers and ADD the exponents.
Example:
x 105) x (6.1 x 103)
 MULTIPLY 7.50 x 6.1
 (7.50
 Don’t
forget to round to the correct significant figures when
you multiply 7.50 x 6.1
 45.75  46
 ADD
5
the exponents of 105 and 103
+ 3 = 8  108
FINAL ANSWER = 46 x 108
Division with S.N.


DIVIDE the numbers and SUBTRACT the
exponents.
Example:
x 103) / (6.1 x 105)
 DIVIDE 7.50 / 6.1
 (7.50
 Don’t
forget to round to the correct significant figures when
you divide 7.50 / 6.1
 SUBTRACT
the exponents of 105 and 103
Division with S.N.


DIVIDE the numbers and SUBTRACT the
exponents.
Example:
x 103) / (6.1 x 105)
 DIVIDE 7.50 / 6.1
 (7.50
 Don’t
forget to round to the correct significant figures when
you divide 7.50 / 6.1
 1.2295 1.2
 SUBTRACT
3
the exponents of 103 and 105
– 5 = -2  10-2
FINAL ANSWER = 1.2 x 10-2
Addition + Subtraction

You must have the SAME EXPONENTS for both of
the numbers you are trying to add or subtract
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
15 min
• Review: Sig Figs + Scientific Notation
10 min
• Metric Prefixes
20 min
• Measurement Lab
Matrix Prefixes


Scientific notation is an essential part of the metric system.
We assign a "unit prefix" to represent specific powers of
ten.
The prefix “kilo” means 103
 Ex. The prefix “micro” means 10-6
 Ex.

The prefix creates a new unit which shrinks or expands the
standard unit so it more appropriately matches with what
is being measured.
 Ex.
If I want to write 25,000 meters, all I have to do is write 25
kilometers.
 The
k took place of the “000”
Metric Prefixes
After scientific notation, this is our last step
to make our lives even easier
1018
1015
1012
109
exa
peta
tera
giga mega
E
P
T
G
106
M
103
10-2
10-9
10-12 10-15 10-18
kilo
centi milli micro nano
pico femto atto
k
c
10-3
m
10-6
µ
n
p
f
a
Metric Prefixes
1018
1015
1012
109
exa
peta
tera
giga mega
E
P
T
G
106
M
103
10-2
10-9
10-12 10-15 10-18
kilo
centi milli micro nano
pico femto atto
k
c
10-3
m
10-6
µ
n
p
Rewrite the following numbers using prefix notation:
1. 7 x 10-3 s
2. 9.8 x 103 g
3. 5.12 x 10-2 m
f
a
Metric Prefixes
1018
1015
1012
109
exa
peta
tera
giga mega
E
P
T
G
106
M
103
10-2
10-9
10-12 10-15 10-18
kilo
centi milli micro nano
pico femto atto
k
c
10-3
m
10-6
µ
n
Convert from prefix notation to scientific notation:
1. 2.54 km
2. 3.395 mg
3. 1.8 cL
p
f
a
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
15 min
• Review: Sig Figs + Scientific Notation
10 min
• Metric Prefixes
20 min
• Measurement Lab
Measurement Lab
I have set up stations at each table. You will be
rotating between the stations and given three
minutes at each one to complete your task.
Directions are on the lab worksheet.