Chemical bonding and structure (Second test)

For each question choose the answer you consider to be the best.

1. Which correctly describes a process that occurs in the following reaction?

2Al(s) + 3O₂(g) → 2Al₂O₃(s)

A. Each aluminium atom gains two electrons

B. Each aluminium atom loses two electrons

C. Each aluminium atom gains three electrons

D. Each aluminium atom loses three electrons

2. Which statements accurately describe the structure of solid sodium chloride?

I. It is an ionic lattice

II. Each sodium ion is surrounded by six chloride ions

III. The sodium ions are arranged octahedrally around each chloride ion

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

3. Which is a correct statement about the reaction of sodium metal with chlorine gas?

A. The reaction is exothermic.

B. One mole of chlorine molecules reacts with one mole of sodium atoms

C. Each sodium atom gains one electron from each chlorine atom

D. Both of the ions in the product have the electron configuration of argon.

4. Which is most likely to result in the formation of an ionic bond?

A. When two highly electronegative elements react together.

B. When a highly electronegative element reacts with a group 2 element.

C. When a group 16 element reacts with a group 17 element.

D. When hydrogen reacts with a group 17 element.

5. Which statements are correct about carbon to oxygen bond lengths?

I. The C to O bond lengths are equal in CH₃COOH.

II. The C to O bond length in carbon monoxide is shorter than the C to O
bond length in carbon dioxide.

III. The C to O bond lengths in the ethanoate ion, CH₃COO^– , are equal.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

6. Which statement best describes the intramolecular bonding in ammonia?

A. Van der Waals’ forces and hydrogen bonding

B. Electrostatic attraction between nuclei and shared pairs of electrons

C. London (dispersion) forces only

D. Hydrogen bonding only

7. Which molecule contains the shortest carbon to carbon bond length?

A. CH₃COOH

B. CH₃COCH₃

C. CH₃CHCH₂

D. CH₃CH₂CH₃

8. Which shows the increasing order of oxygen to oxygen bond lengths in oxygen, ozone
and hydrogen peroxide?

A. O₂ < O₃ < H₂O₂

B. O₃ < O₂ < H₂O₂

C. H₂O₂ < O₂ < O₃

D. O₃ < H₂O₂ < O₂

9. What is the shape of NCl₃?

A. Trigonal planar

B. Trigonal pyramidal

C. Tetrahedral

D. Square planar

10. What is the shape of the H₃O⁺ ion and its approximate bond angle?

A. Tetrahedral, 104^o

B. Tetrahedral, 109^o

C. Trigonal pyramidal, 113^o

D. Trigonal planar, 120^o

11. Which compound contains both ionic and covalent bonding?

A. NaOH

B. H₂O₂

C. NaH

D. HF

12. Which molecule has the smallest bond angle?

A. BF₃

B. CO₂

C. H₂S

D. CH₄

13. Which molecule is linear?

A. SO₂

B. C₂H₂

C. HCOOH

D. H₂O₂

14. The following four compounds have very similar molar masses. Which has the strongest
intermolecular forces?

A. CH₃CH₂CH₂CH₂CH₃

B. C(CH₃)₄

C. CH₃CH₂CH(OH)CH₃

D. CH₃CH₂CH₂CHO

15. Which molecule is polar?

A. CO₂

B. C₂H₄

C. CF₄

D. CH₂Cl₂

16. Which substance contains hydrogen bonding?

A. CH₃Cl

B. CH₃COCH₃

C. HCHO

D. CH₃NH₂

17. Which describes metallic bonding best?

A. Positively charged metal ions are attracted to negatively charged ions.

B. Negatively charged metal ions are attracted to positive ions.

C. Negatively charged metal ions are attracted to delocalized electrons.

D. Positively charged metal ions are attracted to delocalized electrons.

18. Which substance is the most volatile?

A. Bromine

B. Iodine

C. Lithium bromide

D. Lithium iodide

19. Which will not conduct electricity?

A. Hg(l)

B. NaCl(s)

C. PbBr₂(l)

D. HCl(aq)

20. Which changes take place when water freezes?

I. The spacing between the molecules increases

II. The density decreases

III. The average kinetic energy of the molecules increases

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

Answers

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