Chemistry

The density of copper is listed as 8.94 g/cm to the third. Two students each make three density determinations of samples of the substance. Student A's results are 7.3 g/mL, 9.4 g/mL, and 8.3 g/mL. Student B's results are 8.4 g/cm to the third, 8.8 g/cm to the third, and 8.0 g/cm to the third. Comparing the two results how close are they in precision and accuracy?

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1. The average of student B is 8.40 g/cc. The average of student A is 8.33 g/cc.
The range of A is 8.0-8.8 or 0.8 from low to high.
The range of B is 7.3 to 9.4 or 2.1 from low to high.
Which do you think is closest to the accepted value? Which has the most closely spaced values?

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2. yes

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3. yeas

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posted by sarah

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