Podcast
Questions and Answers
How should objects to be weighed be handled according to the text?
How should objects to be weighed be handled according to the text?
- By placing them directly on the balance pan
- By washing them thoroughly before weighing
- With care and avoiding direct contact with chemicals (correct)
- With gloves to prevent contamination
What should never be exceeded when using an analytical balance?
What should never be exceeded when using an analytical balance?
- Liquid capacity
- Maximum load (correct)
- Chemical weight
- Dust limit
What is the purpose of a centrifuge chamber as described in the text?
What is the purpose of a centrifuge chamber as described in the text?
- Measuring liquid volumes accurately
- Separating particles from a solution based on shape and size (correct)
- Balancing weights in a container
- Reducing dust in the laboratory environment
What is one key advantage of using electronic balances compared to mechanical balances?
What is one key advantage of using electronic balances compared to mechanical balances?
How does an autoclave operate according to the text?
How does an autoclave operate according to the text?
Why is it important to keep a balance clean according to the text?
Why is it important to keep a balance clean according to the text?
What is the main component of an autoclave?
What is the main component of an autoclave?
What is the purpose of the wire basket in an autoclave?
What is the purpose of the wire basket in an autoclave?
What does TOT stand for in the context of sterilization?
What does TOT stand for in the context of sterilization?
How does increasing the temperature affect the Thermal Death Time (TOT)?
How does increasing the temperature affect the Thermal Death Time (TOT)?
What is the role of the Basket Support in an autoclave?
What is the role of the Basket Support in an autoclave?
Who designed the gas analyzer known as the Clark Cell?
Who designed the gas analyzer known as the Clark Cell?
Study Notes
Analytical Balance
- Never exceed the maximum load capacity of the balance
- Keep the balance clean and free from dust
- Objects to be weighed should not be handled with bare hands
- Chemical objects should not be placed directly on the pan, and liquids should be in a closed vessel or bottle
Centrifuge Chambers
- Used for separating particles from a solution based on shape, density, and size
- Each chamber has a double pom analytical balance
Single Pan Analytical Balance
- Uses a standard procedure of putting a counter weight on an immovable horizontal path
- Provides a convenient way of measuring weight
Electronic Balance
- Two types: load type and electromagnetic type
- Provides convenience and freedom from mechanical failure
- Reduces sensitivity and provides high accuracy
Autoclave
- Uses high-pressure steam to sterilize equipment
- Operates by using steam to reach high temperatures, killing microorganisms
- Time required to kill microorganisms is referred to as thermal death time (TOT)
- Autoclave operates on a time-temperature relationship, where increasing temperature decreases TOT
- Components of an autoclave include a boiler, wire basket, and basket support
Blood POâ‚‚ Measurement
- Measures the partial pressure of oxygen in blood
- Uses a polarographic method with a platinum electrode
- Operates by reducing oxygen in the blood, which generates a voltage signal
- Voltage range observed is between 0.6 and 10 polarization voltage
- Designed by Clark, a scientist
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Description
Test your knowledge on the care and use of an analytical balance. Questions cover topics such as maximum load, cleanliness, handling of objects, and proper storage of materials.
