Chemical Research Nine Weeks Exam

25 Questions | By Shirley01walton | Last updated: May 1, 2018

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Questions and Answers

1.

Which of the following contains only one type of atom?

Discuss
- A.
  
  A. compound
- B.
  
  B. mixture
- C.
  
  C. element
- D.
  
  D. solution
2.

Which of the following has a positive electric charge?

Discuss
- A.
  
  A. electron
- B.
  
  B. proton
- C.
  
  C. neutron
- D.
  
  D. atom
3.

In an atom, what forms a cloud around the nucleus?
- A.
  
  A. electrons
- B.
  
  B. protons
- C.
  
  C. nertrons
- D.
  
  D. positively charged particles
4.

A carbon atom has a mass number of 12. how many protons and how many neutrons does it have?
- A.
  
  D. 6,6
- B.
  
  C. 12,12
- C.
  
  B. 6,12
- D.
  
  A. 12,6
5.

On Earth, oxygen usually exists as which of the following?
- A.
  
  A. solid
- B.
  
  B. gas
- C.
  
  C. liquid
- D.
  
  D. plasma
6.

Which of the following isotopes has seven neutrons?

Discuss
- A.
  
  A. boron-12
- B.
  
  B. nitrogen-12
- C.
  
  C. carbon-14
- D.
  
  D. hydrogen-2
7.

Which type of bond occurs because of the polar molecules of water?

Discuss
- A.
  
  A. ionic
- B.
  
  B. covalent
- C.
  
  C. metallic
- D.
  
  D. hydrogen
8.

Which of the following are electrically charged?

Discuss
- A.
  
  A. molecule
- B.
  
  B. solution
- C.
  
  C. isotope
- D.
  
  D. ion
9.

What type of property is the color of your clothes?

Discuss
- A.
  
  A. chemical property
- B.
  
  B. physical property
- C.
  
  C. isotopic property
- D.
  
  D. molecular property
10.

Which of the following is not a physical property of water?
- A.
  
  A. transparent
- B.
  
  B. colorless
- C.
  
  C. higher density than ice
- D.
  
  D. changes to hydrogen and oxygen when electricity passes through it
11.

What changes when the mass of an object increases while volume stays the same?

Discuss
- A.
  
  A. color
- B.
  
  B. length
- C.
  
  C. density
- D.
  
  D. height
12.

What is the volume of a brick that is 20 cm long, 10 cm wide, and 3 cm high?

Discuss
- A.
  
  A. 33 cm3
- B.
  
  B. 90 cm3
- C.
  
  C. 600 cm 3
- D.
  
  D. 1,200 cm 3
13.

What is the density of an object with a mass of 50 g and a volume of 5 cm3?

Discuss
- A.
  
  A. 45 g/cm3
- B.
  
  B. 55 g/cm3
- C.
  
  C. 10 g/cm3
- D.
  
  D. 250 g/cm3
14.

What word best describes the type of materials that attract iron?

Discuss
- A.
  
  A. magnetic
- B.
  
  B. chemical
- C.
  
  C. mass
- D.
  
  D. physical
15.

Which is an example of a chemical property?

Discuss
- A.
  
  A. color
- B.
  
  B. mass
- C.
  
  C. density
- D.
  
  D. ability to burn
16.

Which is an example of a physical change?

Discuss
- A.
  
  A. metal rusting
- B.
  
  B. silver tarnishing
- C.
  
  C. water boiling
- D.
  
  D. paper burning
17.

What characteristic best describes what happens during a physical change?

Discuss
- A.
  
  A. composition changes
- B.
  
  B. composition stays the same
- C.
  
  C. form stays the same
- D.
  
  D. mass is lost
18.

Which is an example of a chemical change?

Discuss
- A.
  
  A. water freezes
- B.
  
  B. wood is carved
- C.
  
  C. bread is baked
- D.
  
  D. wire is bent
19.

Which is NOT a clue that could indicate a chemical change?

Discuss
- A.
  
  A. change in color
- B.
  
  B. change in shape
- C.
  
  C. change in energy
- D.
  
  D. change in odor
20.

What property stays the same during physical and chemical changes?

Discuss
- A.
  
  A. density
- B.
  
  B. shape
- C.
  
  C. mass
- D.
  
  D. arrangements of particles
21.

What is the material through which mechanical waves travel?

Discuss
- A.
  
  A. charged particles
- B.
  
  B. space
- C.
  
  C. a vacuum
- D.
  
  D. a medium
22.

What is carried from particle to particle in a water wave?

Discuss
- A.
  
  A. speed
- B.
  
  B. amplitude
- C.
  
  C. energy
- D.
  
  D. matter
23.

What are the lowest points on a transverse wave called?

Discuss
- A.
  
  A. crests
- B.
  
  B. troughs
- C.
  
  C. compressions
- D.
  
  D. rarefactions
24.

What determines the pitch of a sound wave?

Discuss
- A.
  
  A. amplitude
- B.
  
  B. frequency
- C.
  
  C. speed
- D.
  
  D. refraction
25.

What is the distance between adjacent wave compressions?

Discuss
- A.
  
  A. one wavelength
- B.
  
  B. 1 km
- C.
  
  C. 1 m/s
- D.
  
  D. 1 Hz

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