1- Sigma Aldrich is a popular chemical manufacturer. Go to the website (https://www.sigmaaldrich.com/united-states.html) and search for the chemical hydrochloric acid, ACS Reagent 37%. Open the Safety Data Sheet (SDS). Use the SDS to identify the NFPA rating for HCl.

Blank # 1: Health Rating

Blank # 2: Fire Rating

Blank # 3: Reactivity Rating

Question 21 options:

Blank # 1——-

Blank # 2——–

Blank # 3———

2- Gases can have both mechanical and chemical hazards.

heating a crucible over a bunsen burner. The crucible is sitting on an iron mesh gauze over the flame. How should you remove the crucible?

• Pick it up with paper towels and gloved hands.

• Pick it up with crucible tongs.

• Pick it up with your gloved hands.

5-Before starting an experiment, which of the following steps should be taken?

• Look up and understand the chemical hazards.

• Review safety signs in the laboratory. 

• Prepare hazardous waste container with the appropriate label.

6- How long should you rinse your eyes after being exposed to a chemical?