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Questions and Answers
What should be done to minor cuts to stop bleeding?
What should be done to minor cuts to stop bleeding?
What is the first action to take if laboratory glassware is broken?
What is the first action to take if laboratory glassware is broken?
In the case of fainting, how should the person be positioned?
In the case of fainting, how should the person be positioned?
What should you do in case of an electrical shock?
What should you do in case of an electrical shock?
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What is the recommended action for acid spills on the skin?
What is the recommended action for acid spills on the skin?
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Which type of pipette is designed for transferring fixed volumes only?
Which type of pipette is designed for transferring fixed volumes only?
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What is the primary use of volumetric flasks?
What is the primary use of volumetric flasks?
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What is the primary function of graduated cylinders in a lab?
What is the primary function of graduated cylinders in a lab?
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Which type of glassware is best for mixing solutions without spills?
Which type of glassware is best for mixing solutions without spills?
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Which piece of laboratory glassware is designed to dispense precise amounts of liquid reagents?
Which piece of laboratory glassware is designed to dispense precise amounts of liquid reagents?
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What is the formula for determining density?
What is the formula for determining density?
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What type of balance directly displays an object's mass on an LED display?
What type of balance directly displays an object's mass on an LED display?
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Which of the following methods can be used to determine the density of water?
Which of the following methods can be used to determine the density of water?
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Which statement about burettes is correct?
Which statement about burettes is correct?
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When using balances, what is typically shown on the display?
When using balances, what is typically shown on the display?
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What is a common objective in laboratory procedures involving density?
What is a common objective in laboratory procedures involving density?
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Study Notes
Common First Aids
-
Injuries: Cuts, Bruises
- Do not touch an open wound without safety gloves.
- Press directly on minor cuts to stop bleeding quickly.
- Apply cold compresses to bruises to reduce swelling.
Broken Laboratory Glassware
- Alert the instructor immediately if glassware is broken.
- Do not touch broken glass.
Fainting
- Provide fresh air and have the person recline with their head lower than their body.
Poisoning
- Alert the instructor immediately.
- Find out what substance caused the poisoning.
Electrical Shock
- Alert the instructor immediately.
- Shut down the current at the source.
- Carefully remove wire using rubber gloves.
Spills on Skin
- Flush with large quantities of water.
- Baking soda solution for acid spills.
- Vinegar or boric acid for base spills.
Injuries to Eyes
- Immediately flush eyes with plenty of water for several minutes.
- Do not rub eyes if a foreign object is lodged in them.
Common Laboratory Glassware
-
Pipettes
- Disposable transfer pipette: Made of plastic; used to transfer liquids drop-wise.
- Graduated pipettes: Have markings to measure liquid transfer volumes. Often used for transferring reagents or solvents for dilution.
- Volumetric pipettes: Glass pipettes used to transfer highly accurate volumes of liquid. Common fixed volumes include 1 ml and 10 ml.
- Pipette Pumps: Used to aid in the use of pipettes. Different colors/types are available depending upon the purpose and quantity of liquid to be used.
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Graduated Cylinders, Beakers, Erlenmeyer Flasks:
- Graduated Cylinders: Used for transferring liquids with moderate accuracy.
- Beakers: Used as general containers and come in many sizes. Volume markings may be rough approximations.
- Erlenmeyer Flasks: Used as reaction vessels in titrations. Volume markings may not be a precise measure.
- Volumetric Flasks: Designed for precise measurement and storage of liquids and has a line indicating the exact volume.
- Burettes: Vertical cylindrical pieces of laboratory glassware; used to precisely dispense liquids in titrations. The measurements on the burette are taken from the top of liquid dispensed.
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Additional Equipment
- Bunsen Burner
- Funnels
- Test tubes
- Test tube racks
- Test tube brush
- Test tube holder
- Clamp and clamp extension.
Weighing and Electronic Balance
- Mass determination requires a balance.
- Balances are precision instruments and quickly weigh objects.
- Most balances display mass directly on an LED display.
- Common balance types: 2-digit and 4-digit.
Determining Density of Substances
- Density is mass per unit volume of a substance.
- Objectives: Learn to use lab equipment and devices, determine density of water, and identify unknown substances using density comparisons.
- Units of density are kg/m³ or g/cm³, (g/mL).
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Procedure:
- Weigh a beaker accurately.
- Add 10 ml of a liquid to the beaker and re-weigh.
- Calculate weight of liquid.
- Calculate density (Weight of liquid/Volume)
- Repeat for unknown substance.
- Calculations: Calculate the density of the substance after finding its weight and volume
- Results: Compare the calculated density with standard densities to identify the substance.
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Description
Test your knowledge on common first aid procedures for various injuries such as cuts, bruises, and electrical shocks. This quiz covers essential steps to take in emergency situations, ensuring safety and proper care. Learn how to respond effectively to fainting, poisoning, and other medical emergencies.
