Question

question 3. a chemical reaction was carried out three times. the mass of the product was 8.93 g for the first trial, 8.94 g for the second trial, and 8.92 g for the third trial. under the conditions of the experiment, the reaction is known to yield an accepted value of 8.60 g of product. the three mass values measured are______ a) accurate. b) precise. c) both accurate and precise. d) neither accurate nor precise.

Explanation:

Accuracy refers to how close measured values are to the accepted (true) value. The measured values (8.93 g, 8.94 g, 8.92 g) are all far from the accepted value of 8.60 g, so they are not accurate. Precision refers to how close measured values are to each other. The three values are very close (differing by 0.01-0.02 g), so they are precise.

Answer:

b) precise.