Warm Up: August 30, 2013

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Warm Up: August 30, 2013


Ally dropped a delicate glass vase 6 feet from
the top of a ladder onto a concrete floor. The
glass did not break. Why?



The ladder was 7 feet tall.

Correct HW


1.3 Measurement


SI System
(
Systeme

International
d’Unites
)
is
an international system of units used by
scientists.


It allows scientists in different countries to
easily share data and results.

Length


A measure of the distance between two points



SI unit: meter (m)



Instruments used : ruler, meter stick,
measuring tape

Time


A measure of the passing of events



SI unit: second (s)



Instruments used : clock, timer

Temperature


A measure of the movement of



molecules



SI unit: Kelvin (K)



(not
°
F or
°
C)



Instrument used: thermometer



Volume


A measure of the amount of space something
takes up



SI unit: Liter (L)



Instrument used: graduated cylinder

Mass


The amount of matter present



SI unit: kilogram (kg)



(1 kg = 1000 g)


A gram is approximately the mass of a paper clip.


Instrument: triple beam balance, digital balance


Weight


Weight is not the same as mass.



Weight is force, or push or pull.



Weight depends on gravity and depends on
where you are in the universe.



The units for weight are pounds (
lb
) or
Newtons

(N).



Instrument: scale, spring scale

Measuring Volume


We measure volume using a graduated
cylinder.



They come in a variety of sizes and
materials (glass, plastic).



The ones we use measure volume

i
n milliliters (1000 mL = 1 L)

The Meniscus


Many liquids, when
placed in a graduated
cylinder, will cling to the
sides creating a u
-
shape
called a meniscus.



You always use the
BOTTOM of the meniscus
to make a measurement.

Rainbow Lab


In this lab you will practice using a graduated
cylinder to measure volume.



Everyone at your table must make at least one
measurement with the graduated cylinder.


Label 6 test tubes in order: A, B, C, D, E & F
.




Into test tube A, measure 25 mL of RED liquid.


Into test tube C, measure 17 mL of YELLOW liquid.


Into test tube E, measure 21 mL of BLUE liquid.



Part 2:


From test tube C, measure 4 mL and pour into test tube D.


From test tube E, measure 7 mL and pour into test tube D. Swirl.


From test tube E, measure 4 mL and pour into test tube F.


From test tube A, measure 7 mL and pour into test tube F. Swirl.


From test tube A, measure 8 mL and pour into test tube B.


From test tube C, measure 3 mL and pour into test tube B. Swirl.

Things to think about…

1.
Is there any water or food coloring on your hands
or the table? If this liquid was hydrochloric acid,
you lost some of your data and may have burned
yourself!

2.
Are the volumes in the test tubes what they
should be at the end? Double check!

Example: Test tube A should have 25
-

7
-

8 = 10 mL



Pour the contents on A back in the graduated

cylinder and see how you did.

Homework


P. 26 #1a
-
b & #2a
-
c


1.3
Vocabulary Booklet Part I


define: SI,
weight, mass, volume, meniscus, density (6
words on p. 16)