Block 2_chemistry B Pre-test

10 Questions | By Shaun_horton | Updated: Mar 21, 2022 | Attempts: 67

Questions

Settings

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!

Questions and Answers

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.