b
Review:
To investigate how temperature affects seed
germination, a student placed 10 radish seeds of
the same variety on moist paper in each of 3 petri
dishes and placed the dishes in the following
environments:
Dish # 1: Refrigerator, 5ºC
Dish # 2: Room Temperature, 20ºC
Dish # 3: Incubator, 37ºC
1. State the problem of this investigation.
2. Which factor is the variable in this
investigation?
Dish # 1: Refrigerator, 5ºC
Dish # 2: Room Temperature, 20ºC
Dish # 3: Incubator, 37ºC
3. Identify the control group.
4. Which factor is the dependent variable?
The driver of a tractor-trailer truck more than 13 feet tall attempted
to drive under a 12-foot bridge. The truck was carrying chemicals
to spokesman Stephen MacDonald said. The city’s hazardous
materials team responded, but no chemicals or fuel ultimately
leaked.
http://www.learnalberta.ca/content/mesg/htm
l/math6web/index.html?page=lessons&les
son=m6lessonshell15.swf
Volume • The amount of space
an object takes up
3
• UNITS = L or cm
• 1 mL = 1 cm3
1. Volume of a Solid:
How is
volume
V = L x W x H
measured?
• Ex:
L =2 cm, W=1 cm, H=1 cm
V =2cm x 1cm x 1cm
3
V = 2 cm
•Example: V = ?
•V = L x W x H
2cm x 3cm x 5cm
3
V = 30 cm
2. Volume of a liquid:
graduated cylinder (mL)
• Measure at the
MENISCUS
V =73 mL
V = 18 mL
5.5 mL
26
93mL
mL
23.5 mL
V = 9 – 7= 2
V = 2 mL
V1 = 7 mL
V2= 9 mL
3.Volume of irregular solid:
• Displacement
• V with object - V w/o object
Mass
• Amount of matter in an object
• Grams (g)
• TRIPLE BEAM BALANCE
Topic: Measurement
Aim: Practice measuring length, volume
and mass.
Do Now:
1. Work on Ditto
2. Work on displacement question from
yesterday’s notes
HW: Castle Learning (Scientific Method)
due Monday
1 cm
1mm
• 1 cm = 10 millimeters
Images created at http://www.standards.dfes.gov.uk/primaryframework/downloads/SWF/measuring_cylinder.swf
Example:
V = 20 –11.5
V = 8.5 mL
V1 =11.5 mL V2 = 20 mL
V = 260mL – 200mL
http://resources.edb.gov.hk/~s1sci/R_S1Science/sp/en/syllabus/unit14/n
ew/testingmain1.htm
60mL
9 cm
8 cm
10 cm
V=L x W x H
V = 10cm x 8cm x 9cm
V = 720
3
cm
http://www.touchspin.com/chem/DisplayTBB.html
Topic: Measurement
Aim: Practice measuring length, volume
and mass.
Do Now: (Take out Simpsons HW)
Let’s talk about your research!
HW: Castle Learning (Scientific
Method) due Monday
***Research due
Wednesday, October 5th.****
Mass = 542 gm
Mass = 542 gm
What is the total mass?
Where should the riders be?
172 g
http://www.ohaus.com/products/education/weblab/TBBread.html
Mass = 137.4 gm
Mass = 25.4 gm
Mass = 79.4 gm
Let’s summarize…
1. What is the name of the instrument used to
measure volume? To measure mass?
2. What are the units used when measuring the
volume of a liquid? Of a solid?
3. Explain how the volume of a certain amount of
liquid is measured.
4. Explain how the volume of a solid is
determined.
5. Explain how displacement is used to measure
the volume of an irregular solid.
Review:
1. Which piece of laboratory equipment
would be used to obtain the most
accurate measure of the volume of a
glucose solution?
a. triple beam balance
b. graduated cylinder
c. beaker
d. metric ruler
2. Which piece of equipment could
be used to determine the mass of
a frog?
a. triple beam balance
b. graduated cylinder
c. beaker
d. metric ruler
3. Mass is best defined as the
a. size of an object
b. density of an object
c. amount of matter in an object
d. weight of an object
4. The amount of space an
object takes up is known as
its
a. mass
b. density
c. volume
d. matter
5. The units for the volume of a
solid is
a.mL
b.mm
c. L
3
d.cm
6. The basic unit of volume in
the metric system is the
a. kilogram
b. gallon
c. liter
d. mass
7. The basic unit of mass in the
metric system is the
a. kilogram
b. gallon
c. liter
d. meter
8. To measure the volume of an
irregular solid, a student can use
a. a triple beam balance
b. a beaker
c. displacement in a graduated
cylinder
d. a thermometer
6. The volume of a liquid is 13.0 mL.
What must a student do to obtain
a volume of 12.5 mL of liquid in
the graduated cylinder?
a. Add 0.5 mL of liquid.
b. Add 1.5 mL of liquid.
c. Remove 0.5 mL of liquid.
d. Remove 1.5 mL of liquid.
5. Which procedure is the most acceptable method for
obtaining the accurate weight of a specimen in a
laboratory experiment?
a. Make sure the balance weighs accurately before starting
the measurement, and then record the weight for three
trials and average the results.
b. Readjust the balance after weighing the specimen, and
then weigh the specimen again.
c. Have two classmates use different balances to determine
the weight of the specimen, and average the values they
obtain.
d. Determine the weight of the specimen using one balance,
and then measure the weight again using a different
balance.
http://www.brainpop.com/science/matterand
chemistry/measuringmatter/