Questions of the TOEFL iBT Reading Comprehension Practice Test 008

 

Question 1. Paragraph describes which type of bond as having a direction in space?
A) Ionic bond
B) Covalent bond
C) Polar covalent bond
D) Weak intermolecular bond

Question 2. According to the paragraph, which of the following is NOT true about covalent bond?
A) It results in the formation of molecules
B) It is stronger than weak intermolecular bonds
C) It can result in strong and tough structures
D) It results in the formation of polymers

Question 3. The author mentions all of the following EXCEPT:
A) Ionic bonds are strong
B) Ionic bonds result from equal electrostatic attraction
C) Ionic bonds are brittle
D) Ionic bonds are directional

Question 4. Which of the following can be inferred from the paragraph about chemical bonds?
A chemical bond is an attraction between two electrons.
A covalent bond is a bond between two nuclei.
A polar covalent bond is a bond between two electrons.
An ionic bond is a bond between two positive charges.

Question 5. The author of the paragraph implies that
Covalent bonds are stronger than ionic bonds.
Ionic bonds are stronger than covalent bonds.
Both covalent and ionic bonds are equally strong.
None of the above.

Question 6. Why does the author mention the "simplest view of a covalent bond"?
To contrast it with a polar covalent bond
To emphasize the importance of covalent bonds
To provide a general overview of covalent bonds
To explain the formation of chemical bonds

Question 7. The word "valence" in the passage is closest in meaning to…
Inside
Outside
Center
Middle

Question 8. The phrase "polarization in covalent bonds" in the passage is closest in meaning to…
Breaking of covalent bonds
Change in covalent bonds
Division of covalent bonds
Imbalance in covalent bonds

Question 9. Which of the sentences below best expresses the essential information in the following sentence? "These bonds exist between two particular identifiable atoms and have a direction in space, allowing them to be shown as single connecting lines between atoms in drawings, or modeled as sticks between spheres in models."
A) Bonds connect specific atoms and can be visualized in drawings or models.
B) The direction of bonds between atoms can be seen in drawings or models.
C) There are bonds between particular atoms and they have a direction in space.
D) The bonds between atoms are represented as connecting lines in drawings or as sticks in models.

Question 10. Look at the four letters – (A), (B), (C), and (D), – that indicate where the following sentence can be added to the passage. "In a polar covalent bond, one or more electrons are unequally shared between two nuclei." Where would the sentence best fit?
(A)
(B)
(C)
(D)