units of measurement. drill # 89/4/2014 write drill # 8 and the date in your notebook copy the...
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Units of Measurement
Drill # 8 9/4/2014
Write drill # 8 and the date in your notebook
Copy the questions (they are on the right side of the board)
Answer 7 minutes, everyone is quiet
and in her/his seat
Topic: Units of Measurement
Objective: Students will be able to Name the basic metric
units and give examples of derived units
Measure length and liquid volume
HW #7: Get worksheet
Number vs. Quantity
Quantity - number + unit
No Naked Numbers! UNITS MATTER!!
SI Units (copy)
Quantity Base Unit Symbol
Length
Mass
Time
Temp
meter
kilogram
second
kelvin
m
kg
s
K
Current ampere A
Changing the size of SI Units
mega- M 106
deci- d 10-1
centi- c 10-2
milli- m 10-3
Prefix Symbol Factor
micro- 10-6
nano- n 10-9
pico- p 10-12
kilo- k 103
Derived Units (copy)
Combination of base units. Derived by multiplying or dividing
quantities to get new quantities Volume = length length length
cm x cm x cm = cm3
1 cm3 = 1 mL 1 dm3 = 1 L Density = mass /volume (g/cm3)
The Metric System
In science class we use the Metric System.
The metric system is simpler and easier to use
Most countries only use the metric system.
In the US we still use the English System except in science.
1 inch = 2.54 centimeters
Compare
1 mile = 1.6 km
1 yard = 0.9444 meters
The ruler
1 cm = 10 mm
What is the length of the line in centimeters? 2.80 cm
What is the length of the line in millimeters?
28.0 mm
Correct way to record measurement
(copy) Include all digits below the
mark Add one more digit that is
estimated If the mark is exactly on the line
you still have to add the extra digit make it “0” This is how you tell that the mark was
on the line
Measuring Volume of Liquids (copy)
Graduated cylinder
The curve is called meniscus
Place cylinder on level surface
Move so your eyes are at meniscus level
Read the “ruler” at the bottom of the meniscus
What causes meniscus(copy)
The molecules of the liquid stick to the walls of the cylinder
Parallax error-when you are looking at an angle
Parallax error
What is the volume?
A. 52.0 mL
B. 37.0 mL
C. 26 mL
Derived unit for Density
You have a sample with a mass of 620 g & a volume of 753 cm3. Find density.
GIVEN:
M = 620 g
V = 753 cm3
D = ?
DM
V
WORK:
D = M V
D = 620 g
753 cm3
D = 0.82 g/cm3
Drill # 9 9/5/2014
Write drill # 9 and the date in your notebook
Copy the questions (they are on the right side of the board)
Answer 7 minutes, everyone is quiet
and in her/his seat
Topic: Measuring Part I
Objective: Students will be able to
Use proper tecniques to measure length and liquid volume
HW Free Friday
Guided Practice
Group work Individual paper! Choose your role Obtain worksheet Obtain materials Read directions Complete
assignment Return materials 20 minutes
Materials Rulers 10 pennies Graduated cylinder Eye dropper Cup Water in the cup
Did we achieve objectives?
Objective: Students will be able to
Name the basic metric units and give examples of derived units
Measure length and volume
What is your HW for tonight
1.Complete the HW#7 worksheet
Exit Ticket ID#, in your seat, and quiet Questions:1. Name the unit for:a)massb)Timec)Temperatured)Length2. What is meniscus (in
chemistry) ?