Question

12 report sheet · basic laboratory techniques

1. why should you never determine the mass of a hot object?
2. why is it necessary to calibrate a thermometer and volumetric glassware?
3. what is precision?

Explanation:

• Question 8: A hot object can damage weighing equipment and cause inaccurate mass readings due to air - current effects and thermal expansion.
• Question 9: Calibrating thermometers and volumetric glassware ensures accurate temperature and volume measurements respectively, as manufacturing tolerances and environmental factors can affect their accuracy.
• Question 10: Precision refers to the degree of agreement among repeated measurements under the same conditions, indicating the reproducibility of a measurement.

Answer:

• 8. A hot object can damage weighing equipment and give inaccurate mass readings due to air - current and thermal expansion effects.
• 9. To ensure accurate temperature and volume measurements as manufacturing tolerances and environmental factors can affect accuracy.
• 10. Precision is the degree of agreement among repeated measurements under the same conditions, indicating measurement reproducibility.