measurement triple beam balance: mass of solids graduated cylinder: volume of liquids metric ruler:...
TRANSCRIPT
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Measurement
Triple Beam Balance: Mass of Solids
Graduated Cylinder: Volume of Liquids
Metric Ruler: Length Thermometer: Temperature
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Glassware
Beaker
Erlenmeyer Flask
Hold liquids while they are being stirred or heated
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Follow these steps when finding the mass of an object...1. With nothing on the tray move all of the sliders to the zero position
and make sure that the pointer is lined up with the zero mark. 2. Place the object on the tray and adjust the sliders as described in
the picture above until the pointer is lined up with the zero mark again. (Note: When the back two sliders are in a correct position they will be locked in one of the notches on the beam.)
3. Add the values that the three sliders are pointing at to determine the object's mass.
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1. What is the mass of the object on the balance?
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2. What is the mass of the object on the balance?
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3. What is the mass of the object on the balance?
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4. What is the mass of the object on the balance?
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Using the Graduated Cylinder
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When reading a graduated cylinder,
1.Place the cylinder on a flat surface
2.Bend down to get your eye even with the meniscus
3.Read the BOTTOM of the meniscus
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Remember to read the bottom of the meniscus
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What is the volume of liquid in this cylinder?
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What is the volume of liquid in this cylinder?
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What is the volume of liquid in this cylinder?
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• This picture shows a liquid in a ten milliliter graduated cylinder. What is the volume of the liquid?
• 6.6 ml
• 6.8 ml
• 7.0 ml
• 7.2 ml
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The picture shows a student reading a graduated cylinder. Which change would help ensure that a more accurate measurement is made?
a. The student should be seated.
b. The cylinder should be held with two hands.
c. The student should be wearing insulated gloves.
d. The cylinder should be on a flat surface.
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Measuring length using a meter stick or a ruler
The meter stick is divided into smaller units called centimeters.
Centimeters are divided into smaller units called millimeters
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What is the thickness of the dime in cm? mm?
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Using the Thermometer
Thermometers are used to measure the temperature of liquids
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Thermometer
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Thermometer
Fahrenheit Celsius
Some thermometers have 2 scales used to measure temperature. In science we only measure temperature in Celsius
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When reading a thermometer you should have 1 estimated place.
What is the temperature on this thermometer?
24.0 oC
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Bunsen Burner
Heating Source
Hot Plate
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Hot Hands
Proper way to handle HOT glassware
Beaker Tongs
Proper Way to handle Hot glassware
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Medicine Dropper
Dropper Bottles
Syringes
Equipment to Transfer Liquids
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Funnel
• Assists in transferring liquids to containers with smaller openings
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Test tube brushTest tube holders
Test tube rack
Test tubes
- holds liquids for observation or testing
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Biology Lab Equipment
Microscope: used to enlarge an image
Dissecting scope
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Microscope Slides: supports an item being examined under the microscope
Cover Slips: covers specimen on a slide
Depression Slides
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Dissecting Equipment
Dissecting Scissors
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Scalpel: used for cutting specimens being dissected
Dissecting Probes: used to prod the specimen
Forceps: used to hold or lift specimens
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• Which piece of laboratory equipment is used for dissecting a flower's pistil?
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Safety Equipment
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Fire Extinguisher
Fire Blanket – stop, drop, and roll
Fire Blanket Box
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Safety Shower
Eye Wash Station