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My report on "Intermolecular Attractions: Day One"
My report on "Intermolecular Attractions: Day One"
Student name: Khoa Nguyen
Period: 6th
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!)
When two atoms bond to form a molecule, if the electrons are share equally in both side then the molecule will be non polar. The charges cancel out each other. If the electron are not shared equally which cause one atom to have more electrons than the other then the molecule is polar. It has partial negative and positive charge. (10:17:46 PM)
2. Image showing intermolecular attractions:
Non-polar molecules attract to other non-polars moleule and polar moleacule. Polar molecules ony atract to other polar molecules when two ends of opposite charge are close together. (10:52:45 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) (10:20:15 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) (10:58:31 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) (10:58:41 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) (10:58:47 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) (11:00:43 PM)
2. Explain how intermolecular attractions affect the boilng point of a substance.
The boiling point of a substance will be greater if the intermolecular attractions are stronger because it requires more heat to break free the molecules. And the boiling point is smaller if the intermolecular attractions are weaker because it requires less heat to break free the molecules. (11:04:11 PM)
3. Explain why polar and non-polar substances won't stay mixed with each other.
Polar and non-polar substances won't stay mixed with each other because polar substances have stronger intermolecular attractions (dipole-dipole attractions) so the polar molecules will be pulled together stronger than non-polar molecules that have weaker intermolecular attractions. Therefore, non-polar molecules will be pushed out of the group of polar molecules. Non-polar molecules then attract to each other. Two separate groups of molecules are formed. (11:15:49 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) (11:18:24 PM)
2. Explain why polarity has an affect on the strength of attraction between molecules.
Polar molecules form stronger attractions than non-polar molecules. Therefore the more polarity there is the stronger the attaction will be. It means the amount of polarity is proportional to the strenth of attractions between molecules. (11:27:55 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) (11:29:05 PM)
4. Explain your choice for highest boiling point:
The substance 1,4,7-heptanetroil will have highest boiling point because it has the highest polarity. (11:34:29 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) (11:37:07 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) (11:37:41 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.
In the strength of the London Dispersion attraction, the bigger size of molecules will form stronger attractions because more attoms will form more attractions that will pull the molecules more tightly together. The shape also affect the strenghth of attractions because it decide the number of molecules that can stay close together. For example, large curve and circular molecules form stronger attractions than large straight and circular molecules because they allow more molecules to be close to eachother. (11:49:47 PM)
Page 6 : http://mw2.concord.org/public/part2/vdw/page6.cml
1. Snapshot with annotations indicating hydrogen bonds:
Hydrogen only attract to Oxygen in the molecules. Hydrogen bond has hydrogen on one end and oxygen on the other end. (11:57:06 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.
If water molecules had no attraction for each other at all, water would most likely be gas because the water molecules would not be grouped together but individually floating around in the air. (12:01:59 AM)
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?
G-C pair is held together more strongly because according to the model, G-C pair has more hydrogen bonds than A-T pair does (10:27:03 PM)
Page 8 : http://mw2.concord.org/public/part2/vdw/page8.cml
1. Image of the 3D anitibody/antigen from top of page:
Viewing half of the antibody shows us that the entire antigen is fit inside the antibody. All parts of the antigen attract to the antibody (10:43:09 PM)
2. Image of the anitbody you just designed:
As the antibody has more charge, the antigen will be held more tightly (11:04:41 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.
A gecko's feet stick much better to a wall because it has lots of tiny hair-like struture which give its feet large surface area. On a microscopic level, the rough surface of a wall has many little pumbs that will fit into the hair structure of a gecko's feet which allow more surface area to interract. Our fingers don't have tiny hair struture which mean they have less surface area to interact with the wall. That's why a gecko's feet stick much better to a wall. (11:18:11 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) (11:18:38 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) (11:18:48 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) (11:19:08 PM)
4. Explain why you chose Substance A or B.
I chose substane B because it has molecules that attract with dipole-dipole attraction because this kind of attraction is stronger so it will pull the molecules together more tighly. therefore it will require more heat to break free the molecules (11:22:34 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.
The substance that is made from molecules that are larger has molecules attract with London dispersion attraction so it's easy to break free the molecule eventhough the substance has larger size. Another factor that make the two substances have the same boiling point is the shape of the molecules. (11:26:59 PM)
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