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1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

11. Bonding & Molecular Structure

Lewis Dot Structures: Neutral Compounds

General Chemistry

11. Bonding & Molecular Structure

Lewis Dot Structures: Neutral Compounds

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Multiple Choice

Which of the following statements correctly describes the Lewis dot structure for the neutral compound Sr(CN)2?

Sr donates two electrons to form Sr2+, and each CN group is present as a linear anion with a triple bond between C and N.

Sr forms single bonds with the carbon atoms of each CN group, and the CN groups have double bonds between C and N.

Sr remains neutral, and each CN group is present as a neutral molecule with a single bond between C and N.

Sr shares electrons covalently with both CN groups, resulting in a bent geometry for each CN.

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Verified step by step guidance

Identify the nature of the elements involved: Sr is an alkaline earth metal, which typically forms cations by losing electrons, while CN is a polyatomic ion known as cyanide.

Determine the likely charge on Sr in the compound Sr(CN)2. Since Sr is in group 2, it tends to lose two electrons to form Sr^{2+}.

Recognize that each CN group acts as a cyanide ion (CN^{-}), which carries a negative charge and has a characteristic linear structure with a triple bond between carbon and nitrogen.

Understand that the bonding between Sr^{2+} and the two CN^{-} ions is ionic, not covalent, so Sr does not share electrons covalently but donates electrons to form the cation.

Conclude that the correct Lewis structure shows Sr^{2+} ion and two linear CN^{-} ions, each with a triple bond between C and N, consistent with the ionic nature and geometry of the compound.