With a very precise volumetric measuring device, the volume of a liquid sample i

Question

With a very precise volumetric measuring device, the volume of a liquid sample is determined to be 6.321 L (liters). Three students are asked to determine the volume of the same liquid sample using a less precise measuring instrument. How do you evaluate the following work of each student with regards to precision, and accuracy? A10 gram sample of material, A, was placed in water. Four grams of it, B, did not dissolve, even after being separated and placed in a second volume of water. B could not be decomposed into any simpler substances. Evaporation of the water from the soluble portion of A yielded 6 grams of solid, C. Heating B in air yielded 8 grams of gas, D, leaving no solid residue. Melting and electrolysis of C yielded 2.4 grams of metal, E, and 3.6 grams of gas, F. Classify each material described above by placing the corresponding letter in the appropriate place in the table below.

Explanation / Answer

6. Student A : Not precise, Not accurate

     Student B : accurate but not precise

     Student C : precise but not accurate

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7.

element compound Mixture definitly E, B C A Possible F C C definitly not C E, B, B

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