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My report on "Chemical Reactions and Stoichiometry"
My report on "Chemical Reactions and Stoichiometry"
Student name: Michael Koneig
Teacher name: (Randy Schmitz)
School: Gross Catholic
Submission Time: 2/7/15 3:35 PM
Page 1 : http://mw2.concord.org/public/part2/chemreact/page1.cml
1. When does a chemical reaction occur? (Note: You can reset the model or even play it backwards .)
(a) Any two atoms can form a bond at any time.
(b) When two unbonded atoms collide with each other.
(c) When any two atoms hit each other even if they have already formed bonds to other atoms.
(d) Sometimes, when bonded atoms collide with something else, the bond breaks.
(e) Both B and D are correct.
My answer is (e) (3:08:36 PM)
2. If the atoms are heated to a high temperature:
(a) bonds tend to form rather than break.
(b) bonds tend to break rather than form.
(c) on average there are just as many atoms without bonds as atoms with bonds.
(d) the temperature seems to have no effect on bonding.
My answer is (b) (3:10:04 PM)
Page 2 : http://mw2.concord.org/public/part2/chemreact/page2.cml
1. How does the atom concentration affect the rate of the chemical reaction?
(a) Concentration has no effect.
(b) Increased concentration = increased reaction rate.
(c) Increased concentration = decreased reaction rate.
My answer is (b) (3:11:45 PM)
2. Explain the connection between concentration, collisions, and reaction rate.
The higher the concentration of atoms the more collisions which also increases the reation rate. All have a direct relation to each other. (3:12:35 PM)
Page 3 : http://mw2.concord.org/public/part2/chemreact/page3.cml
1. How does the temperature affect the rate of the chemical reaction?
(a) Temperature has no effect.
(b) Higher temperature = increased reaction rate.
(c) Higher temperature = decreased reaction rate.
My answer is (b) (3:13:36 PM)
2. Explain the connection between temperature, collisions, and reaction rate.
The higher the temperature the more collisions which means a higher reaction rate. they are all directly related (3:14:22 PM)
3. What do you think would happen if you could raise the temperature to a much higher level than is allowed using the slider above?
(a) It will just form bonds even faster.
(b) No bonds will form.
(c) Bonds will form, but they will also break apart.
My answer is (c) (3:13:45 PM)
Page 4 : http://mw2.concord.org/public/part2/chemreact/page4.cml
1. What changes did you make to the size of the container and the temperature to reach 80% completion the fastest way possible? Explain why that worked.
I made the contaner as small as it could be and I made the temperature so that it was high enough to have a high energy but low enough to keep the molecules from breaking. (3:18:59 PM)
2. Why shouldn't you set the temperature for the highest possible value if your goal is to have about 80% of the atoms bonded to form molecules?
Because this will cause the molecules to collide at high velocities which would cause them to break apart and this would be bad. (3:19:43 PM)
Page 5 : http://mw2.concord.org/public/part2/chemreact/page5.cml
1. Describe what happens in the following reaction: A + B2 AB + B
One A atom collides with a B2 molecule and one B atom breaks off and bonds with the A and then the other B atom stands alone while the A and B form an AB molecule (3:21:43 PM)
Page 6 : http://mw2.concord.org/public/part2/chemreact/page6.cml
1. Which hydrogen to chlorine ratios give a reaction that forms HCl with nothing left over? (Select all that work.)
(a) 1 hydrogen : 1 chlorine
(b) 2 hydrogen : 1 chlorine
(c) 2 hydrogen : 2 chlorine
(d) 2 hydrogen : 3 chlorine
(e) 4 hydrogen : 4 chlorine
My answer is (a) (c) (e) (3:24:35 PM)
2. What is the correct balanced equation for making water from hydrogen and oxygen?
(a) H2 + O2 --> H2O
(b) 2 H2 + O2 --> H2O
(c) 4 H2 +2 O2 --> 4 H2O
(d) 2 H2 + O2 --> 2 H2O
(e) 2 H2 +2 O2 --> 4 H2O
(f) H2 +2 O2 --> H2O
My answer is (d) (3:26:02 PM)
Page 7 : http://mw2.concord.org/public/part2/chemreact/page7.cml
1. Which is the limiting reactant in the 2nd reaction?
(a) fuel
(b) oxygen
(c) both are limiting
My answer is (a) (3:27:18 PM)
2. Explain why it is hard to get ALL of the fuel to react if you use exactly the right ratio of fuel to oxygen. hint
Because the atoms keep bouncing off the walls and molecules and they cannot always reach each other and if they do it takes a long time. (3:27:57 PM)
3. To power your car a specific amount of gasoline (fuel) is mixed with air (containing oxygen). If the mixture is not right, then your car will not have much power, or it will be spitting out lots of unburned fuel as a pollutant, or both. What do you think is the best fuel/oxygen mixture to optimize power and reduce pollution (i.e. get the most fuel in the cylinder which can be burned efficiently)?
(a) use the perfect ratio of fuel to oxygen as indicated by the chemical equation
(b) use extra fuel, making oxygen the limiting reactant
(c) use a lot of extra oxygen, making the fuel a very limiting reactant
(d) use a little extra oxygen, making the fuel the limiting reactant
My answer is (d) (3:28:42 PM)
Page 8 : http://mw2.concord.org/public/part2/chemreact/page8.cml
1. Reaction 1 is what type of reaction:
(a) synthesis
(b) decomposition
(c) single displacement
(d) double displacement
My answer is (b) (3:30:10 PM)
2. Reaction 2 is what type of reaction:
(a) synthesis
(b) decomposition
(c) single displacement
(d) double displacement
My answer is (a) (3:30:46 PM)
3. Reaction 3 is what type of reaction:
(a) synthesis
(b) decomposition
(c) single displacement
(d) double displacement
My answer is (c) (3:30:37 PM)
Page 9 : http://mw2.concord.org/public/part2/chemreact/page9.cml
1. Which of the following affect the rate of reaction?
(a) concentration of reactants
(b) temperature of reactants
(c) boiling point of reactants
(d) both A and B
(e) none of the above
My answer is (d) (3:31:02 PM)
2. Explain your answer for the previous question about factors affecting reaction rates.
As concentration rises the reaction rate rises, as the temperature rises the reaction rate rises and vice versa for both. (3:32:26 PM)
3. The process by which food rots is ultimately driven by chemical reactions. Why does refrigerating food make the food last longer? (Be sure to explain it at the molecular level.)
It lasts longer because it is colder and this means the molecules have less energy so they do not move and collide as much so the reaction rate is much slower than if it were to have a high temperature. (3:33:53 PM)
4. Which chemical equation below is shorthand for the following description? One molecule of methane (CH4) reacts with two molecules of oxygen (O2) to form one molecule of carbon dioxide (CO2) and two molecules of water (H2O):
(a) CH4 + O2 --> CO2 + H2O
(b) 2 CH4 + 4 O2 --> 2 CO2 + 4 H2O
(c) CH4 + 2 O2 --> CO2 + 2 H2O
(d) CH4 + 2 O2 --> 2 CO2 + 2 H2O
My answer is (c) (3:33:53 PM)
5. Aluminum reacts with oxygen to form aluminum oxide, a thin non-reactive coating that prevents aluminum from further rusting. The UNBALANCED chemical equation is: Al + O2 Al2O3. What is the correct BALANCED chemical equation?
(a) 8 Al + 6 O2 --> 4 Al2O3
(b) 2 Al + 3 O2 --> Al2O3
(c) 4 Al + 3 O2 --> 2 Al2O3
My answer is (c) (3:34:17 PM)
6. Some dry powder fire extinguishers contain baking soda and use the following reaction to produce carbon dioxide (CO2), which helps to smother the fire: 2 NaHCO3 Na2CO3 + H2O + CO2. What type of reaction is this?
(a) synthesis
(b) decomposition
(c) single displacement
(d) double displacement
My answer is (b) (3:34:27 PM)
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