Use the bond enthalpies in the table below to determine the enthalpy change for the following unbalanced reaction: N2O(g) + H2O(g) + O2(g) → HNO3(g) Substance ΔH°f (kJ mol−1) N2O(g) +81.6 H2O(g) −241.82 O2(g) 0 HNO3(g) −133.9

In the hydrazine molecule, HNNH, what type of bond(s) exist between the two N atoms? (Hint: work out the Lewis structure)

Which of the following ions has a ground-state electron configuration of 1s22s22p6?   I. Ne+   II. O2−   III. Na+

Which of the following molecules contains a single covalent bond?

How many polar bonds does CHCl3 contain?

Use the bond enthalpies in the table below to determine the enthalpy change for the following unbalanced reaction: B2H6(g) + F2(g) → BF3(g) + HF(g)  Substance ΔH°f (kJ mol−1) B2H6(g) +36.4 F2(g) 0 BF3(g) −1136.0 HF(g) −273.3

The following are all types of echoic words: assonance, consonance, alliteration, onomatopoeia, and rhyme.

According to molecular orbital theory, what are the bond orders of the H–H bonds in the molecules H2, H2−, and H2+?

What is it called when a rhyme happens somewhere besides the end of a line?

What is the best definition of onomatopoeia?