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Answer :
Final answer:
Among the examples, Gary's action of using tongs to handle heated glassware correctly demonstrates the best safety practices. Other practices listed neglect the rules of stability, cleanliness, and proper tool utilisation.
Explanation:
The statement that best describes a student following safe glassware practices in a scientific lab context is 'Gary uses tongs to heat a test tube over a flame.' This method suggests the utilization of appropriate tools to handle glassware and substances, thereby preventing potential thermal injuries. Unlike Gary, Nekesa's action of setting beakers on the table's edge and Penina's habit of using the first graduated cylinder she sees both violate safety rules that demand ensuring stability and cleanliness. Meanwhile, Zaid stirs his solution with a thermometer, risking damage to the instrument, which is not intended for stirring purposes.
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Final answer:
Among the provided options, the safe lab practice is that of Gary's, who uses tongs to heat a test tube over a flame. Other methods described pose risks of falls, exposure to harmful substances, or inaccurate results.
Explanation:
Out of the described scenarios, the statement that best describes a student following safe glassware practices is: 'Gary uses tongs to heat a test tube over a flame.' This practice is typical of safe laboratory operations.
Using tongs to handle a test tube ensures the student's hands are not exposed to the heat from the flame, reducing the risk of burns. It also safeguards against breaking the test tube due to the heat.
On the other hand, setting beakers on the edge of a table (as Nekesa does) poses a risk of the beaker falling and potentially causing harm or damage. Stirring a solution with a thermometer (like Zaid does) can break the thermometer, which may lead to exposure to harmful substances if it's a mercury thermometer.
Lastly, Penina taking and using the first graduated cylinder she sees without inspecting it, can lead to inaccurate results if the cylinder is dirty or chipped or has incorrect calibration.
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