Questions and Answers
What does PASS stand for in relation to fire extinguishers?
How long should an eyewash station be used?
15 minutes
What is the main precaution for gas cylinders?
Visually check that gas cylinder is restrained and keep a safe distance around it
Which types of signs convey information about chemical storage?
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What information is needed to communicate with emergency responders?
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What is the best way to smell a chemical sample?
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What is the last step of any spill cleanup procedure?
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How should students prepare to use chemicals in the lab?
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What is the extra step in cleaning up acid and base spills?
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What are the best practices for safely handling waste in the lab?
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When should you remove goggles in the lab?
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What should you do before you heat glassware on a hot plate?
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What is the best time to clean glassware after use?
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Where should glassware be stored after it is cleaned?
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What is accuracy?
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What is precision?
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With results of 32.9 mL and a standard deviation of 0.3 mL, what is the standard way to report the result?
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What is random error?
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What is systematic error?
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Systematic error is caused by _____, while random error is caused by _____
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Study Notes
Fire Safety Procedures
- Use the PASS method for operating a fire extinguisher: Pull the pin, Aim the nozzle, Squeeze the handle, Sweep the extinguisher side to side.
Eyewash Station Usage
- An eyewash station should be used for a minimum of 15 minutes in case of exposure.
Gas Cylinder Precautions
- Visually inspect gas cylinders to ensure they are restrained. Maintain a safe distance from the cylinders.
Chemical Storage Signage
- Signs used for chemical storage include hazard signs, NFPA (National Fire Protection Association) labels, and gas cylinder identification.
Communication with Emergency Responders
- Provide emergency responders with information about chemicals involved, hazards present, and details on how the incident occurred.
Smelling Chemical Samples
- To safely smell a chemical sample, gently waft the smell towards you using your hand.
Spill Cleanup Procedure
- The final step in cleaning a spill is to wipe down the affected area with detergent and water.
Chemical Handling Preparedness
- Students should locate spill kits, understand their usage, and familiarize themselves with any chemicals and their associated hazards.
Acid and Base Spill Cleanup
- For acid and base spills, it's essential to neutralize the spill before proceeding with cleanup.
Waste Handling Best Practices
- Always wear personal protective equipment (PPE) and check labels or disposal instructions before discarding waste.
Goggles Usage
- Remove goggles only after all individuals in the lab have completed handling chemicals.
Heating Glassware Safety
- Before heating glassware on a hot plate, check for cracks, inspect for frayed cords, and ensure the glassware is suitable for heating.
Cleaning Glassware
- Clean glassware as soon as practical after use for optimal results.
Glassware Storage
- After cleaning, store glassware in a drying oven or designated areas like drawers or buret racks.
Accuracy vs. Precision
- Accuracy reflects how close a measurement is to the true value, while precision measures the consistency of repeated measurements.
Reporting Measurement Results
- Report a result with a standard deviation by stating it in the form: measurement ± standard deviation (e.g., 32.9 ± 0.3 mL).
Types of Error
- Random errors occur due to the sample being an imperfect representation of the population, while systematic errors shift measurements consistently, affecting accuracy and introducing bias.
Causes of Errors
- Systematic errors are caused by improper measuring device usage, while random errors stem from fluctuations in the measuring device.
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Description
This quiz covers essential fire safety procedures, proper usage of eyewash stations, and safety practices for handling chemicals and gas cylinders. Test your knowledge on emergency response communication and spill cleanup protocols to ensure a safe working environment.