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My report on "Intermolecular Attractions"
My report on "Intermolecular Attractions"
Student name: Jen Yaconiello
Teacher name: lewhite
Class: (Your class)
School: Landstown
Submission Time: 4/8/13 3:09 PM
Page 1 : http://mw2.concord.org/public/part2/vdw/page1.cml
1. What is the difference between polar and non-polar molecules? (Be sure to include more than the colors used to represent them in your response!)
Polar molecules are electracally charged while non-polar molecules are not.
(2:02:27 PM)
2. Image showing intermolecular attractions:
Opposite molecules are being attracted. (2:06:20 PM)
3. Which of the following formed intermolecular attractions (check all that apply):
(a) + ends of polar molecules to + ends of other polar molecules
(b) + ends of polar molecules to - ends of other polar molecules
(c) - ends of polar molecules to - ends of other polar molecules
(d) non-polar molecules to other non-polar molecules
(e) non-polar molecules to + parts of polar molecules
(f) non-polar molecules to - parts of polar molecules
My answer is (b) (d) (e) (f) (2:05:47 PM)
Page 2 : http://mw2.concord.org/public/part2/vdw/page2.cml
1. What is the primary attraction between NON-POLAR molecules:
(a) London Dispersion attraction
(b) dipole-dipole attraction
(c) gravitational attraction
(d) magnetic attraction
My answer is (a) (2:07:49 PM)
2. What is the primary attraction between POLAR molecules:
(a) London Dispersion attraction
(b) dipole-dipole attraction
(c) gravitational attraction
(d) magnetic attraction
My answer is (b) (2:08:10 PM)
3. Which type of intermolecular attraction is strongest:
(a) London Dispersion attraction
(b) dipole-dipole attraction
(c) gravitational attraction
(d) magnetic attraction
My answer is (b) (2:08:26 PM)
Page 3 : http://mw2.concord.org/public/part2/vdw/page3.cml
1. Which liquid boiled first (i.e. had the lowest boiling point):
(a) The polar liquid boiled first.
(b) The non-polar liquid boiled first.
(c) They both boiled at the same time.
My answer is (b) (2:09:23 PM)
2. Explain how intermolecular attractions affect the boilng point of a substance.
Polar attractions higher the boiling point of the substance. Non-polar attractions lower the boiling point of substance. (2:12:39 PM)
3. Explain why polar and non-polar substances won't stay mixed with each other.
Polar molecules have stronger attractions. (2:15:02 PM)
Page 4 : http://mw2.concord.org/public/part2/vdw/page4.cml
1. Which molecule had the strongest attraction:
(a) the least polar molecule
(b) the medium polarity molecule
(c) the most polar molecule
My answer is (c) (2:15:50 PM)
2. Explain why polarity has an affect on the strength of attraction between molecules.
Polar molecules have the stronger attraction, because they have the stronger magnetic force. (2:20:02 PM)
3. Which substance will have the highest boiling point:
(a) 1-heptanol
(b) 1,7-heptanediol
(c) 1,4,7-heptanetriol
My answer is (c) (2:20:52 PM)
4. Explain your choice for highest boiling point:
Because it has the most polar molecules. (2:21:35 PM)
Page 5 : http://mw2.concord.org/public/part2/vdw/page5.cml
1. Which molecule pairs had the strongest attraction (check all that apply):
(a) the two small molecules
(b) the two large straight molecules
(c) the large straight and bent molecules
(d) the large straight and circular molecules
(e) the large curved and circular molecules
My answer is (b) (e) (2:26:49 PM)
2. Propane boils at -42°C, butane at 0°C, and pentane at 36°C. They are all straight molecules. Which one is the biggest?
(a) propane
(b) butane
(c) pentane
My answer is (c) (2:28:00 PM)
3. Small molecules did not attract well. However, only some of the large ones had a strong attraction. Describe how both size and shape play a role in the strength of the London Dispersion attraction.
The more surface area of the molecule, the stronger the attraction. Because there is more points of contact between molecules. (2:32:16 PM)
Page 6 : http://mw2.concord.org/public/part2/vdw/page6.cml
1. Snapshot with annotations indicating hydrogen bonds:
7 hydrogen bonds (2:37:35 PM)
2. While not possible, imagine that water molecules had no attraction for each other at all. Would you most likely find water as a solid, liquid, or gas? Explain your reasoning.
Gas because the particals would be too spread apart to form a liquid or a solid. (2:39:29 PM)
Page 7 : http://mw2.concord.org/public/part2/vdw/page7.cml
1. Which pair of bases is held together more strongly: C and G, or A and T? How do you know?
A G-C pair is held together stronger than a A-T pair because a G-C pair have 3 bonds holding it together rather than 2 bonds. (2:44:02 PM)
Page 8 : http://mw2.concord.org/public/part2/vdw/page8.cml
1. Image of the 3D anitibody/antigen from top of page:
showing the relationship between the anitbody and antigen, and you the molecules stick together (2:58:51 PM)
2. Image of the anitbody you just designed:
The best anti-body. (2:59:02 PM)
Page 9 : http://mw2.concord.org/public/part2/vdw/page9.cml
1. Why do you think a gecko's feet stick much better to a wall than your fingers? Think about surface area, intermolecular attractions, and the rough surface (on a microscopic level) of a typical wall.
because gecko's feet have better groves on their feet that help them along the wall rather than our fingers that have very small groves. (3:01:17 PM)
Page 10 : http://mw2.concord.org/public/part2/vdw/page10.cml
1. Which of the following is NOT an attractive force between molecules:
(a) London dispersion
(b) dipole-dipole
(c) covalent bond
(d) hydrogen bond
My answer is (c) (3:02:05 PM)
2. Which factors affect the strength of the intermolecular attractions? (check all that apply)
(a) the color of the molecules
(b) the polarity of the molecules
(c) the shape of the molecules
(d) the size of the molecules
My answer is (b) (c) (d) (3:02:24 PM)
3. You have two substances: A and B. Both have molecules of similar size and shape. Substance A has molecules that attract with London dispersion attraction, and substance B has molecules that attract with dipole-dipole attraction. Which one will have the higher boiling point?
(a) Substance A
(b) Substance B
My answer is (b) (3:02:36 PM)
4. Explain why you chose Substance A or B.
Because dipole-dipole is the strongest attraction. (3:04:04 PM)
5. You have two substances, both of which have the same boiling point (or attraction between their molecules). The first substance is made from molecules that are small (just a few atoms bonded together), and the second substance is made from molecules that are larger (many atoms bonded together). How can it be possible for two such different molecules to yield substances with the same boiling point? Describe the kinds of intermolecular attractions that must be involved and any other properties of the molecules that could cause this result.
NOT ANSWERED.
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