Intro to Chemistry Questions

CHEM 1101

Homework Assignment #7

Chapter 6.3-6.5, 8.1-8.2

  1. What is the percent yield of the following reaction if 3.50 g of CO2 were produced from the reaction of 10.0 g of CaCO3 with excess HBr?

CaCO3 (s) +2 HBr (aq) → CaBr2 (aq) + H2O (l) + CO2 (g)

  1. True or False. The percent yield of a reaction is an indication of its efficiency.
  2. True or False. Molecules with strong intermolecular forces will generally have low boiling points.
  3. True or False. Solids have a definite volume.
  4. True or False. Nonpolar molecules have dipole-dipole IMFs with other nonpolar molecules.

 

  1. What type(s) of intermolecular forces are present for each of the following molecules? a.) OF2 (hint: the O-F bond is polar)
  2. C5H12
  3. CH3CH2CH2OH (hint: the C-O and O-H bonds are polar) d.) O2

7.) For each pair, which molecule is expected to have the higher boiling point and why?

a) CH3CH2CH2CH2OH vs. CH3CH2CH2CH2CH3

  1. HF vs. HBr (hint: both the H-F and H-Br bonds are polar)
  2. CO2 vs. C10H22 (hint: the C-O bond is polar)

 

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