Which must be worn to protect the feet?

• Closed shoes

• Safety boots

• Sandals

• any type of shoes

If you are not sure about the instructions of a lab you should:

• Talk it over with a classmate and follow his/her advice.

• Watch the person next to you and follow his/her example.

• Ask the instructor.

• Not do the lab.

You are absent for a lab and plan to make up an experiment. You should:

• Come in anytime it is convenient and do your experiment.

• Make arrangements with the instructor for a specific time to do the experiment.

• Come in anytime the lab is empty and do your experiment.

• Do it at home.

Which must be worn to prevent eye injuries?

• Goggles

• Sunglasses

• Contact lenses

• None of these

Part of your lab instructions reads: “Use 5 mL of Na₂SO₄ solution.” The bottle you choose to use should have which label?

• Na₂SO₃

• Na₃PO₄

• Na₂SO₄

• Na₂S₂O₃

Tags

NGSS.HS-PS1-1

Your procedure requires the use of 2 g of salt. The best way to obtain the salt is to:

• Guess how much 2 g into a container and pour into a beaker.

• Pour or dump out what you need into your hand.

• Use your spatula to scoop out what you need into another container.

• Use your spatula to scoop out what you need directly on the scale.

You are doing an experiment and have an idea for a new experiment that you would like to try. You should:

• Ask the instructor for permission to try it.

• Ask your lab partner for his/her opinion

• Go ahead and try it

Which can generally be discarded in a sink?

• Your gum

• Broken glass

• Paper towels

• Solutions/liquids

Tags

NGSS.HS-LS2-7

Your procedure calls for 10 mL of a particular aqueous solution. In pouring, you mistakenly take 15 mL of the solution. You should:

• Drink the extra 5 mL.

• Use the entire 15 mL.

• Pour the excess down the drain.

• Pour the excess back into the bottle.

The following rule is designed to prevent injury by one of the following modes of entry.  Specify which type of problem is addressed.

Do not handle chemicals directly with your hands. Check with the instructor before working in the lab to open cuts or other skin conditions.

• CONTACT       -           usually with the skin (touching)

• INHALATION -           enters the lungs (through gas)

• INSPECTION   -           taken internally (swallowed)