Podcast
Questions and Answers
The volume is found by reading the number of graduated tenths of ______
The volume is found by reading the number of graduated tenths of ______
milliliters
Never put anything back into the reagent ______
Never put anything back into the reagent ______
bottle
Only use appropriately labeled ______ for each reagent bottle.
Only use appropriately labeled ______ for each reagent bottle.
spatulas
When you are finished using a chemical, replace the ______!
When you are finished using a chemical, replace the ______!
Each of the balances you will be using costs somewhere in the neighborhood of [$blank] to $2500.
Each of the balances you will be using costs somewhere in the neighborhood of [$blank] to $2500.
Select a suitable container (usually a weigh boat, weigh paper, or ______) to weigh the chemical in.
Select a suitable container (usually a weigh boat, weigh paper, or ______) to weigh the chemical in.
To prevent spills and accidents, reagents are to remain on the plastic on the center ______.
To prevent spills and accidents, reagents are to remain on the plastic on the center ______.
Only pour the solid into a beaker, onto weighing paper, or into a weigh ______.
Only pour the solid into a beaker, onto weighing paper, or into a weigh ______.
Balances are used to determine the ______ of a reagent or object.
Balances are used to determine the ______ of a reagent or object.
Wire Gauze on a ring supports beakers to be heated by ______.
Wire Gauze on a ring supports beakers to be heated by ______.
Fume Hoods are used to ventilate ______ or harmful gases.
Fume Hoods are used to ventilate ______ or harmful gases.
In a graduated cylinder or a buret, the volume is read from the ______ etched on the glass.
In a graduated cylinder or a buret, the volume is read from the ______ etched on the glass.
To read the level of the liquid properly, the eye should be at the same level as the bottom of the ______.
To read the level of the liquid properly, the eye should be at the same level as the bottom of the ______.
For volumetric flasks and transfer pipets, the volume of the glassware is exact when the bottom of the meniscus is even with the ______.
For volumetric flasks and transfer pipets, the volume of the glassware is exact when the bottom of the meniscus is even with the ______.
A liquid in a small-diameter container will form a ______ at the surface of the liquid.
A liquid in a small-diameter container will form a ______ at the surface of the liquid.
To read the volume correctly, visualize the distance between the tenths of milliliter marks as divided into ______ equal amounts.
To read the volume correctly, visualize the distance between the tenths of milliliter marks as divided into ______ equal amounts.
Beakers are useful as a reaction container or to hold liquid or solid ______.
Beakers are useful as a reaction container or to hold liquid or solid ______.
Bunsen Burners are sources of ______.
Bunsen Burners are sources of ______.
Burets are for addition of a precise volume of ______.
Burets are for addition of a precise volume of ______.
Erlenmeyer Flasks are useful to contain reactions or to hold liquid ______.
Erlenmeyer Flasks are useful to contain reactions or to hold liquid ______.
Graduated Cylinders are for measurement of an amount of ______.
Graduated Cylinders are for measurement of an amount of ______.
Pipets are used to dispense small quantities of ______.
Pipets are used to dispense small quantities of ______.
Volumetric Flasks are used to measure precise ______ of liquid.
Volumetric Flasks are used to measure precise ______ of liquid.
Wash bottles are used for dispensing small quantities of distilled ______.
Wash bottles are used for dispensing small quantities of distilled ______.
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Study Notes
Laboratory Equipment
- Watch Glasses: Used for holding small samples or covering beakers and evaporating dishes.
- Wire Gauze: Supports beakers during heating by Bunsen burners to distribute heat evenly.
- Balances: Determine the mass of objects or reagents, essential for precise measurements.
- Spectrophotometers: Measure absorbance or transmittance of liquid samples, crucial in chemical analysis.
- Fume Hoods: Ventilate harmful gases, ensuring laboratory safety.
Common Laboratory Techniques
-
Reading a Meniscus:
- In volumetric glassware (like pipets and graduated cylinders), read the liquid level at the bottom of the curving meniscus.
- Align your eye level with the meniscus for accuracy; a white card can help visualize it.
- For volumetric flasks, ensure the bottom of the meniscus is even with the etched line; use graduations for other glassware.
-
Care of Reagents:
- Contamination can occur; do not return unused reagents to the original container.
- Use a beaker to pour out reagents then draw up with a pipet for best practice.
- Use labeled spatulas and dispose of excess reagents properly to prevent contamination.
- Keep all chemicals on the center bench to reduce mess and improve organization.
Care and Use of Balances
- Balances are expensive (2000to2000 to 2000to2500); handle with care.
- Use appropriate weighing containers (weigh boats or glassware).
- Remove the balance cover before use and place items carefully to avoid damage.
Common Laboratory Apparatus
- Beakers: Serve as reaction containers, hold liquids or solids, and collect liquids from titrations.
- Bunsen Burners: Provide heat for experiments.
- Burets: Allow for precise addition of liquids, measured to the nearest 0.01 mL.
- Clay Triangles: Support funnels or crucibles on ring stands.
- Droppers: Dispense liquids one drop at a time.
- Erlenmeyer Flasks: Useful for reactions and catching filtrates.
- Glass Funnels: Facilitate transferring liquids and filtration with filter paper.
- Graduated Cylinders: Measure liquid volumes, estimated to the nearest 0.1 mL.
- Hot Plates: Offer heat without an open flame; alternative to Bunsen burners.
- Pipets: Dispense small liquid quantities accurately.
- Ring Stands: Hold glassware securely in place during experiments.
- Test Tubes: Hold small samples or conduct small-scale reactions; require holders for safe handling.
- Tongs: Handle larger items safely, similar to forceps.
- Volumetric Flasks: Measure precise liquid volumes or dilutions with accuracy.
- Wash Bottles: Dispense distilled water in controlled amounts.
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