Question

1. if live animals are in the classroom, observe all of the following rules except

a. handle live animals with care and respect and refrain form teasing them
b. open cages only with the permission and under the supervision of your teacher
c. wash hands after handling animals
d. all of the above are appropriate

1. when using sharp objects, do all of the following except

a. carry them tip down
b. refrain from catching them if they are falling
c. use them to cut away from your body
d. carve your name on your lab table

1. sometimes it is permissible to have a flammable liquid near a bunsen burner.

a. true
b. false

1. a bunsen burner is lit and operating properly when an internal blue flame is visible

a. true
b. false

1. hot and cold glassware

a. looks different; hot glassware is red and cold glassware is blue
b. looks exactly the same
c. looks different; hot glassware is opaque and cold glassware is translucent
d. looks different; hot glassware is iridescent and cold glassware is dull

1. when heating a test tube, it is permissible to look into the test tube or point the tube in the direction of another student.

a. true
b. false

Explanation:

• Question 23: Handling animals with care, opening cages under supervision, and washing hands after handling are all proper practices. So all options are appropriate.
• Question 24: Carving your name on a lab - table is vandalism and not a proper use of sharp objects. The other options are safe handling practices.
• Question 25: Flammable liquids should never be near a Bunsen burner due to fire hazard.
• Question 26: A Bunsen burner with an internal blue flame is operating properly.
• Question 27: Hot and cold glassware look exactly the same, so you can't tell by appearance alone.
• Question 28: Looking into a heating test - tube or pointing it at another student is dangerous as contents could splash out.

Answer:

1. D. All of the above are appropriate
2. D. Carve your name on your lab table
3. B. False
4. A. True
5. B. Looks exactly the same
6. B. False