review :
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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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/html/math6web/index.html?page=lessons&lesson=m6lessonshell15.swf
• The amount of space an object takes up
• UNITS = L or cm3
• 1 mL = 1 cm3
Volume
1. Volume of a Solid:
V = L x W x H
How is volume measured?
•Ex: L =2 cm, W=1 cm, H=1 cm
V =2cm x 1cm x 1cm
V = 2 cm3
•Example: V = ?
•V = L x W x H2cm x 3cm x 5cm
V = 30 cm3
2. Volume of a liquid: graduated cylinder (mL)
•Measure at the MENISCUS
V =73 mL
V = 18 mL
5.5 mL 93 mL26 mL
23.5 mL
V1 = 7 mL
V2= 9 mL
V = 9 – 7= 2
V = 2 mL
3.Volume of irregular solid:•Displacement•V with object - V w/o object
• Amount of matter in an object
•Grams (g)• TRIPLE BEAM BALANCE
Mass
Topic: MeasurementAim: 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
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Example:
V1 =11.5 mL
V2 = 20 mL
V = 20 –11.5
V = 8.5 mL
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V = 260mL – 200mL
60mL
10 cm
9 cm
8 cm
V = L x W x H
V = 10cm x 8cm x 9cm
V = 720 cm3
Topic: MeasurementAim: 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 ghttp://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 balanceb. graduated cylinderc. beaker d. metric ruler
2. Which piece of equipment could be used to determine the mass of a frog?
a. triple beam balanceb. graduated cylinderc. 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
d.cm3
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/matterandchemistry/measuringmatter/