An organic chemistry student is experimentally determining the melting point of fluorenone. The experimental melting points are listed below from a to e. Which one should he discard so that he can say his data is precise?a. 83.5 °C. b. 85.6 °C.
c. 83.6 °C.
d. 83.4 °C.
e. 83.3 °C.

To say his data is precise, he has to discard option b - 85.6 degrees Celsius

Explanation:

During laboratory experiments, the precision of a result data covers the sameness of the data generated or results got each time the experiment is performed.

For the results to be seen as precise, the temperatures recorded during each experiment should be the same, or really close to each other.

Judging based on that, option B does not fit in as it is quite different from the other results by about 2 degrees Celsius. It also indicates that some errors may have occurred during the experiment.

To say his data is precise, he has to discard option b - 85.6 degrees Celsius.

The other temperatures recorded are close to each other. This would now make the data precise.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements