Measurements
A measurement is a
forms a base-10 or
determination of the amount
decimal system.
of something.
built upon seven
A measurement has two metric units
parts:
 number value
 unit
Derived units are
made from
combinations of
base units.
Always include the correct
units with number values.
Scientific Notation
• a x 10n
•
• where a is between
1 and 10
• and n is an integer
1)Write 28750.9 in
scientific notation.
2) Express 1.8 x 10-4
in decimal notation.
• Original number is
less than 1, the
3)Express 4.58 x 106
exponent is negative. in decimal notation.
9.02 x 10-8
4) Write 531.42 x 105
in scientific notation.
• Original number
greater than 1,
exponent is
Bellringer
• Write the mineral number
•
on the board
• Write your group’s mass •
• Calculate the average
•
mass for each mineral
• Keep in your lab
•
notebook.
• Write mass on the board •
• If you are waiting for
others to finish, finish any
missing assignments
Agenda
Notes on SI units
Worksheet on Metric
Conversion
Density Worksheet
If time, start penny
density lab
Make 2 tables. One if Pre 82,
other is Post 82
Number of Mass of
Pennies
Pennies
Initial
Volume
(mL)
5
20 mL
10
20 mL
15
20mL
20
20 mL
Final
Volume
(mL)
Volume
(mL)
Object
Description
Initial
Displaced
Actual
Water (mL) Water (mL) Volume
(mL)
Mass (g)
Density
(g/mL)
Suggest the most probable
identity of the unknown
metal using the chart to the
right. Include an
explanation of your logic.
How would the density of 10
pre-1982 pennies compare
to the density of 20 pre1982 pennies? Explain your
answer. HINT: Think about
what type of property
density is!
Explain why so many
pennies were used for
measurements. Why not
use 1, 2, 3, and 4 pennies
rather than 5, 10, 15, and
20?
Metal
Density g/mL
magnesium
1.74
aluminum
2.70
zinc
7.13
Copper
8.92
silver
10.50
lead
11.35
Bellringer
•
•
•
•
• Place in basket to be graded.
Pick up from the front: • Finish your states of matter
collage
graphing worksheet
• Total of 10 pictures for solid,
Graph line and circle graph
liquid, gas. Write beside each
For the line graph, make
paper which state of matter it
sure you use consistent
is
intervals…each line counts• On back, give 3
as 2. Label the x and y
characteristics of each state of
axis
matter pg. 67&68
For the circle graph, you • Everything completed by 9:45
need to use percentages.
• Everyone caught up: lab
Number of votes/total
tomorrow
number of
votes…Example 2/20= • Test on Friday: Scientific
Method, Graphing, Metric
10%
Conversions