Questions and Answers
The volume is found by reading the number of graduated tenths of ______
milliliters
Never put anything back into the reagent ______
bottle
Only use appropriately labeled ______ for each reagent bottle.
spatulas
When you are finished using a chemical, replace the ______!
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Each of the balances you will be using costs somewhere in the neighborhood of [$blank] to $2500.
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Select a suitable container (usually a weigh boat, weigh paper, or ______) to weigh the chemical in.
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To prevent spills and accidents, reagents are to remain on the plastic on the center ______.
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Only pour the solid into a beaker, onto weighing paper, or into a weigh ______.
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Balances are used to determine the ______ of a reagent or object.
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Wire Gauze on a ring supports beakers to be heated by ______.
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Fume Hoods are used to ventilate ______ or harmful gases.
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In a graduated cylinder or a buret, the volume is read from the ______ etched on the glass.
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To read the level of the liquid properly, the eye should be at the same level as the bottom of the ______.
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For volumetric flasks and transfer pipets, the volume of the glassware is exact when the bottom of the meniscus is even with the ______.
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A liquid in a small-diameter container will form a ______ at the surface of the liquid.
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To read the volume correctly, visualize the distance between the tenths of milliliter marks as divided into ______ equal amounts.
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Beakers are useful as a reaction container or to hold liquid or solid ______.
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Bunsen Burners are sources of ______.
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Burets are for addition of a precise volume of ______.
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Erlenmeyer Flasks are useful to contain reactions or to hold liquid ______.
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Graduated Cylinders are for measurement of an amount of ______.
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Pipets are used to dispense small quantities of ______.
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Volumetric Flasks are used to measure precise ______ of liquid.
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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
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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.
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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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Description
Test your knowledge on common laboratory equipment and techniques. This quiz covers essential tools like balances, spectrophotometers, and fume hoods, along with their applications in the lab. Perfect for students in chemistry and related fields.
