How many covalent bonds will a nitrogen atom usually form?

a. How many sticks did you need to make the skeleton structure?____________ b. How many sticks are left over? ____________ If your model is to obey the octet rule, each ball must have four sticks in it except for hydrogen atom balls, which need and can only have one. Each atom in an octet rule species is surrounded by four pairs of electrons. c. How many holes remain to be filled? ____________ Fill them with the remaining sticks, which represent nonbonding electron pairs. Draw the complete Lewis structure for NH2Cl using lines for bonds and pairs of dots for nonbonding electrons.

Which of the following statements is false concerning bonding? Elements with extremely different electronegativities tend to form ionic bonds with each other. In an N—O bond. electron density is greater near the O atom. An N—O bond is an example of a polar covalent band. In general, chemical bonds form to minimize energy. The bond in KBr is formed by sharing electrons.

11. Which is a compound? steel water a. b. 12. If the volume of a substance is 98.2 cc and it has a mass 56.12 grams, it should have a density of kg/m³. a. 570 C. 571.5 b. 572 d. Answer is not among the choices 13. When the electronegativities of two atoms are about the same,_______result/s. a. Ionic bonds C. Polar covelent bonds b. Non-polar covalent bonds d. Both a and b 14. 80.45 g of charcoal was combined with 160.18 g of oxygen to produce ash and gases. How much ash, in grams, were left if 220.3 g of gases were produced? a. 20.3 b. 60.1 15. CH4 is the C. oxygen d. Both a and b a. structural b. empirical formula for methane. 16. Which is an element? a. sugar b. alcohol C. d. C. d. C. d. 79.7 Answer is not among the choices molecular Both b and c water None of the choices are elements

Which of the following compounds is likely to have the strongest H-X bond? a.HBr (141 pm) b.HI (161 pm) c.HF (92 pm) d.H2S (134 pm) e.HCl (127 pm)

41.How many single bonds that are not part of any double bonds can be found in the best Lewis stucture of CO 2?   A. 0   B. 1   C. 2   D. 3

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Rank each of the molecules below in order of the shortestto the longest sulfur-oxygen bond length.a. S O 2       b. S O 3 2—       c. S O 4 2—

Which statement below is correct? A. Molecules with the formula EO2 or OE2 (E = a non metal) will be nonpolar. B. A molecule which contains polar bonds will always be polar. C. Most, but not all molecules with lone pairs are polar. D. If all the bonds attached to a central atom are the same, the molecule will be nonpolar.

10. Which of the following is technically considered a nonpolar covalent bond? A. C – H B. O – N C. P – Cl D. O – F E. S – Cl