Question

unit 1 test: nature of science

1. which of the following is not safe behavior in a laboratory?

a. tying back long hair while using a bunsen burner
b. chewing gum during a dissection
c. wearing safety goggles while handling chemicals
d. disposing of a rusty scalpel in the sharps container

1. which piece of safety equipment is the best option if a persons hair is on fire?

a. fire blanket
b. eye wash station
c. fire extinguisher
d. fume hood

1. which term means knowledge gained by the systematic study of the structure and behavior of the physical and natural?

a. physical science
b. scientific law
c. scientific theory
d. science

1. you return home from school and find glass on the floor under a broken window alongside a baseball. you assume a person accidentally threw a baseball through your window. you have just made a(n)

a. hypothesis
b. inference
c. observation
d. prediction

1. which of the following should be disposed of in the trash can?

a. a broken test tube
b. a rusty scalpel blade
c. a dirty pair of gloves
d. a petri dish of e - coli

1. science has limitations because it only deals with phenomena that are

a. observable
b. testable
c. falsifiable
d. all of the above

Explanation:

1. Chewing gum during a dissection can lead to accidental ingestion of chemicals or biological materials, which is unsafe. Tying back hair, wearing goggles, and proper disposal of sharp - objects are safe practices.
2. A fire blanket is used to smother flames on a person. An eye - wash station is for eye injuries, a fire extinguisher is for large fires, and a fume hood is for ventilation of chemicals.
3. Science is the knowledge gained by the systematic study of the structure and behavior of the physical and natural world.
4. An inference is a conclusion based on evidence. Here, the evidence is the glass and baseball, and the conclusion is that a person threw a baseball through the window.
5. A dirty pair of gloves can be disposed of in the trash can. Broken test tubes, rusty scalpel blades, and petri dishes with E. coli need special disposal.
6. Science deals with observable, testable, and falsifiable phenomena. If something is not observable, testable, or falsifiable, science cannot study it.

Answer:

1. B. Chewing gum during a dissection
2. A. Fire blanket
3. D. Science
4. B. Inference
5. C. A dirty pair of gloves
6. D. All of the above