Block 2_chemistry B Pre-test
This is the pre-test for Chemistry B. You will receive 10 pts no matter what your score is. However, please try to do your best!
- 1.Which of the following best describes the difference between a scientific hypothesis and a scientific theory? (AZ HS Science S1:C1:PO1)
- A.
Once a scientific hypothesis has been proven, it becomes known as a theory.
- B.
A scientific hypothesis must be testable, while a theory does not have to be tested.
- C.
A scientific hypothesis is a testable assumption, while a theory is a well-verified idea used to explain a broad range of phenomena.
- D.
Only a scientific hypothesis is subject to scrutiny, while a theory does not change.
- 2.Which of the following institutions employs scientists? (AZ HS Science S2:C1:PO3)
- A.
Hospitals
- B.
Universities
- C.
Corporations
- D.
All of the above
- 3.If a piece of laboratory glassware breaks, a student should immediately: (AZ HS Science S1:C2:PO1)
- A.
Notify his/her lab partner and then begin clean-up.
- B.
Notify his/her teacher and students nearby of broken glassware, then follow instructions about proper clean-up and disposal of broken glassware.
- C.
Grab paper towels and begin cleaning up the mess.
- D.
Wait until after the laboratory session is over before picking up the glassware; there are less people around so it is safer.
- 4.To accurately measure the volume of a typical liquid in a graduated cylinder, what should you do? (AZ HS Science S1:C2:PO3)
- A.
Look at the bottom part of the meniscus
- B.
Look at the top part of the meniscus
- C.
Average the top and bottom parts of the meniscus
- D.
Ignore the meniscus and determine which mL line the liquid is closet to
- 5.In the formation of a solution, the solute is: (AZ HS Science S5:C1:PO4)
- A.
The substance which does the dissolving
- B.
Always the liquid substance
- C.
The substance that is being dissolved
- D.
Always the solid substance
- 6.Which of the following is an example of a physical change? (AZ HS Science S5:C1:PO1)
- A.
Rusting bicycle chain
- B.
Melting butter
- C.
Fireworks exploding
- D.
Baking a cake
- 7.In his experiments, JJ Thomson passed electrical current through two positively charged plates at opposite ends of a cathode ray tube from which all air had been removed. What did he discover? (AZ HS Science S5:C1:PO7)
- A.
The neutron
- B.
The electron
- C.
The nucleus
- D.
The proton
- 8.If you have a 2.50 mole sample of a substance how many representative particles does this represent? (AZ HS Science S5:C4:PO5)
- A.
2.50 x 10^23
- B.
6.02 x 10^24
- C.
1.51 x 10^24
- D.
2.50 x 10^24
- 9.Which of the following properties of liquid water are caused by water’s intermolecular forces (hydrogen bonds)? (AZ HS Science S5:C4:PO12)
- A.
Surface tension
- B.
Capillary action
- C.
High specific heat
- D.
All of the above
- 10.Which of the following describes an endothermic reaction? (AZ HS Science S5:C4:PO10)
- A.
Thermal energy is released by the system.
- B.
Thermal energy is absorbed by the surroundings.
- C.
Thermal energy is not transferred.
- D.
The initial and final temperatures of the system remains the same.
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