Imagine you are a science teacher, and your students are performing a flame test. this experiment involves the use of a bunsen burner, which produces an open gas flame. what safety precautions should you discuss with your students before beginning the experiment?

The teacher should discuss safety procedure with students at the beginning of the experiment or laboratory assignment.  The teacher should give list of rules for students.

1.       Always wear safety goggles.

2.        Never touch or rub eyes of face during science investigation.

3.       Keep lids on when not in use.

4.       Never use broken/chipped glassware. 

the answer is:

carbon dioxide

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds