What is the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot-water bath in a chemistry lab?
to avoid reactions of the metal with gases in the lab
to reduce the risk of burns from heat conducted through the metal
to minimize the chance the bracelet pulling over a test tube, causing a spill
to prevent misreading the temperature of the bath on a thermometer

As bracelet is dangling it means there is possibility that the dangled part of bracelet may touch or collide with any lab stuff during performing an experiment

As mentioned in the options the student should remove the dangling bracelet during heating of test tube of acid solution in hot water bath to minimize the chance the bracelet pulling over a test tube, causing a spill.

The acid spill may cause burning , skin irritation, rashes etc

Option (c) is the correct answer.

Explanation:

While working in laboratory it is advice able not to wear accessories like bracelet, long chains etc. This is because it might stuck with the apparatus and may cause a spill.

Therefore, the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot-water bath in a chemistry lab to minimize the chance the bracelet pulling over a test tube, causing a spill.

As this can cause severe burns or accident in the laboratory. Hence, the bracelet should be removed.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

all eukaryotic cell have mitochondria : )