3. describe a possible danger that can occur if you put food, soda, coffee, pencil erasers, etc. in your mouth while conducting your chemistry experiments.

It is possible for the object/food to have been infected/contaminated

Explanation:

If you where to be eating while doing chemistry, it is possible that some of the things you are experimenting with might have gotten on some of the things around, or come off your hands onto the thing.

While performing chemistry experiments one should not eat food while performing the experiments as harmful chemicals can be ingested into mouth along with the food.

There are various types of chemical and substances present in lab which might be harmful for person performing experiment.

One can also get disturbed and might spill chemicals on himself which can be harmful.

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