Chemical bonding & structure (Second test)

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

1. Which are the correct formulas for their respective ions?

2. What is the correct formula for an ionic compound formed between a Group 2 element, A,
and a Group 16 element, B.

A. AB

B. A₂B₆

C. AB₃

D. A₃B

3. 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.

4. Which substance contains both ionic and covalent bonds?

A. HCN

B. NaNO₃

C. MgO

D. HCOOH

5. Which is the best description of the bonding present in ice?

A. Each oxygen atom is covalently bonded to four hydrogen atoms.

B. Each oxygen atom is attracted to four hydrogen atoms by hydrogen bonding.

C. Each oxygen atom is covalently bonded to two hydrogen atoms and attracted to two
other hydrogen atoms by hydrogen bonding.

D. Each oxygen atom is covalently bonded to two hydrogen atoms and attracted to two
other hydrogen atoms by coordinate bonding.

6. What is the shape of PCl₅?

A. Square planar

B. Trigonal pyramidal

C. Trigonal bipyramidal

D. Pentahedral

7. Which molecule or ion has the same shape as XeF₄?

A. ICl₄^-

B. SiCl₄

C. SCl₄

D. PH₄⁺

8. Which is the smallest bond angle in the PF₆^- ion?

A. 180^o

B. 120^o

C. 109.5^o

D. 90^o

9. 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

10. What are the molecular geometry and the F-Br-F bond angle in the BrF₃ molecule?

A. Trigonal pyramid, 107^o

B. Trigonal planar, 109.5^o

C. Trigonal planar, 120^o

D. T-shaped, 86^o

11. Which is correct when the species NH₂^-, NH₃ and NH₄⁺ are arranged in order of
increasing H-N-H bond angle?

A. NH₃ < NH₄⁺ < NH₂^-

B. NH₄⁺ < NH₃ < NH₂^-

C. NH₂^- < NH₄⁺ < NH₃

D. NH₂^- < NH₃ < NH₄⁺

12. Which is the best description of how π bonds are formed?

A. The axial overlap of an s and a p orbital

B. The sideways overlap of parallel p orbitals

C. The axial overlap of two p orbitals

D. The sideways overlap of an s and a p orbital

13. Which is correct concerning the bonding between two carbon atoms?

A. Double bonds are formed when the two carbon atoms are sp³ hybridized.

B. Double bonds are caused by the overlap of two π bonds.

C. π bonds are weaker than σ bonds.

D. Triple bonds are made up of two σ bonds and one π bond.

14. What is the hybridization of the N atom in NO₃^– and NH₃ respectively?

A. sp³ and sp³

B. sp² and sp²

C. sp and sp³

D. sp² and sp³

15. Which types of hybridization are shown by the carbon atoms in ethyl ethanoate, CH₃COOC₂H₅?

I. sp³

II. sp²

III. sp

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

16. Which substance does not contain delocalized electrons?

A. Sodium metal

B. Sodium carbonate

C. Sodium iodide

D. Sodium ethanoate

17. 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

18. Which substance is the most volatile?

A. Bromine

B. Iodine

C. Lithium bromide

D. Lithium iodide

19. 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.

20. What intermolecular forces are present in fluorine gas?

A. Dipole-dipole attractions

B. London dispersion forces

C. Covalent bonds

D. Hydrogen bonds

Answers

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