Multiple Choice
What was the purpose of draping the filter paper over the ceramic dish and heating it during a filtration and evaporation experiment?
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4. BONUS: Lab Techniques and Procedures
Filtration and Evaporation
Multiple Choice
Which of the following is a primary reason for keeping lids on chemical containers in a laboratory setting?
A
To prevent evaporation, spills, and employee exposure to chemicals
B
To increase the rate of chemical reactions
C
To allow more oxygen to enter the container
D
To promote filtration of the chemicals
Verified step by step guidance1
Understand the purpose of keeping lids on chemical containers in a laboratory: lids serve to maintain safety and chemical integrity.
Consider what happens if lids are not used: chemicals may evaporate, spill, or release harmful vapors, leading to exposure risks.
Evaluate the options given: increasing reaction rates or allowing more oxygen are not primary safety reasons for lids.
Recognize that lids help prevent evaporation by limiting the escape of volatile substances, reduce spills by physically covering the container, and minimize employee exposure by containing hazardous fumes.
Conclude that the primary reason for keeping lids on chemical containers is to prevent evaporation, spills, and employee exposure to chemicals.
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