Name_________________________________________ Block_______________ Date_____________________
Review Ch. 1 sec. 1-14
Consider the substance ethylamine, CH3CH2NH2.
1. a. Draw the Lewis structure for ethylamine.
b. Draw bond polarity arrows for any polar bonds shown your Lewis structure in part a.
(The C-H bond is nonpolar.)
2. Fill in the chart for each central atom in ethanol. Refer to your Lewis structure in #1.
Central Atom
VSEPR
Molecular
Shape
Ideal bond
angle
Observed
bond angle
C (terminal)
C (middle)
N
3. Is the ethylamine molecule polar or nonpolar? Explain.
4. Can ethylamine form hydrogen bonds?_______ If so, draw 2 ethylamine molecules and
indicate where hydrogen bonding takes place.
5. List all types of intermolecular forces found in ethylamine.
6. a. Would you classify ethylamine as an element, compound, or mixture?
b. Are ethylamine particles atoms, molecules, or ions?
7. At STP conditions ethylamine is a gas and propylamine (CH3CH2CH2NH2) is a liquid.
a. Explain why these substances are different phases.
b. Make a molecular level drawing for each substance.
c. Which substance would you expect to have a higher heat of vaporization?
Draw energy diagrams to support your answer.
8. Determine the molar mass of ethylamine.
9. Show work for each conversion. Show unit cancellation.
a. 3.75 mol ethylamine = ____________________ g
b. 55.2 g ethylamine = ___________________molecules
c. 4.75 x 1020 molecules ethylamine = ___________________L at STP
Name_________________________________________ Block_______________ Date_____________________
10. a. Rank in order from lowest to highest electronegativity: C, H, O.
______< _______<______
b. Explain the rationale for your order. Use drawings to support your answer.
Include core charge and valence electrons in your drawings.
11. a. Rank in order from lowest to highest electronegativity: F, Br, Cl.
______< _______<______
b. Explain the rationale for your order. Use drawings to support your answer.
Include core charge and valence electrons in your drawings.
12. Draw a Lewis structure for a
a. Ca atom
b. N atom
13. a. Draw Lewis structures for the ionic compound calcium nitride.
b. Write the empirical formula for calcium nitride.
c. Make a drawing to show how the ions are organized in a crystal lattice.
14. Propane is a fuel used in gas grills.
a. Write a balanced equation for the combustion of propane.
b. A piece of copper with initially at 25°C was held in the flame of a propane gas grill.
Describe the heat transfer.
c. When one mole of propane is burned 2.2 kJ of heat energy is released. If you wanted
to raise the temperature of the piece of copper with a mass of 975 g from 25°C to
95°C, how many moles of propane would need to be burned? The specific heat of
copper is 0.386 J/g°C.
15. Give an example of hydrogen bonding in DNA.
16. Describe how intermolecular forces affect viscosity.
17. Do chapter 1 questions 1.75, 1.88, 1.93 found on pages 67-68.