1. The 10 mL graduated cylinder is marked to tenths of mL. How many decimal plac

Question

1. The 10 mL graduated cylinder is marked to tenths of mL. How many decimal places should you record? Hint you want to estimate one digit beyond the markings.

2. Would you expect a piece of glassware marked to the nearest mL or nearest tenth of mL to be more accurate? Which do you expect to be more precise?

3. Why is it best to determine the mass of the metal before placing it into the graduated cylinder of water rather than after?

4. What would happen if you used a very small amount of metal? How would this affect your measurements? Hint: Consider the number of sig figs in your answer if you use more than 1.00 mL of metal or less than 1.00 ml of metal.

Explanation / Answer

1. As the cylinder is marked to tenths of mL, one should record 2 decimal places.

2. A piece of glassware marked to the nearest tenth of mL would be more accurate. This will also be more precise.

3. Because once it is placed in water it will be wet and to weigh it one should dry it again.

4. Yes, it affects the meassurement. If the piece is smaller than 1.00 mL, the significant figures become 2, while it is 3 if the piece is more than 1.00 mL.

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