» Answers & Explanations to Examkrackers MCAT Simulated Exams
EK-1I Answers & Explanations
Old Posted: 9/23/2014 2:44:16 PM   #1
 
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Default  EK-1I Answers & Explanations

http://examkrackers.com/pdf/2011MCAT1IAnswers.pdf
Click the link above to view the answers to simulated exam EK-1I.

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Old Posted: 10/11/2014 3:18:36 PM   #2
 
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Default  Physical Sciences #2

If the dissociation of Ba(OH)2 is Ba++ + 2OH-, then Ksp should be [Ba][2OH-]^2, which results in 4x^3. Given Ksp is 4E-3, set equal to 4x^3 results in .1, option C. So how is D "correct"?
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Old Posted: 10/11/2014 3:26:08 PM   #3
 
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Default  Physical Sciences #9

Please provide an explanation for #9. If the watch glass has a diameter of 20.0 c and the volume of the acid solution added is 0.1mL, which of the following represents the approximate thickness of the monolayer in cm?

Correct answer: B
(0.1)(0.0001)/(3.14)(10)^2
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Old Posted: 10/11/2014 3:32:03 PM   #4
 
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Default  Physical Sciences #12

Please provide an explanation for #12. Which of the following, if true, would introduce the least error into the experiment?

Correct answer: Some of the arachidonic acid protonated the water.

Why not A?... Not all the benzene evaporated
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Old Posted: 10/11/2014 3:39:20 PM   #5
 
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Default  Physical Sciences #18

18. Which of the following is a true statement conceding a comet passing near the sun?

Correct: C=The mechanical energy of the comet is nearly conserved because interaction with sun is similar to an elastic collision.


So why is A wrong? A=The momentum of the comet is nearly conserved because the interaction with the sun is similar to an elastic collision.
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Old Posted: 10/11/2014 3:41:54 PM   #6
 
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Default  PS #20

Please give the reasoning for #20. Before conducting his experiment, Rutherford believed atoms were composed of a uniform positive "jelly" in which electrons were embedded like chocolate chips in a cookie. if this were an accurate structure for the atom, what would the result of Rutherford's gold-foil experiment likely have been? 
A. None of the alpha particles would have been deflected by a large amount.
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Old Posted: 10/11/2014 3:46:39 PM   #7
 
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Default  PS #24

The enthalpy of formation for liquid water is -285. According to students experiment it can be determined that the enthalpy of formation of MgO (s) is?
C. -590


How is this possible?
Given info in passage was change in enthalpy for oxidation of MgO to Mg 2+ is -115.
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Old Posted: 10/11/2014 3:48:29 PM   #8
 
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Default  PS #26

Why is the answer C versus D?
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Old Posted: 10/11/2014 3:55:49 PM   #9
 
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Default  PS #31

Please provide explanation/calculation for #31.

I understand P=FA and P stays constant between both so I set FA=F2A2 and plugged and chugged. Then plugged F into W=F*.05m.
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Old Posted: 10/11/2014 3:59:44 PM   #10
 
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Default  PS #48

Please provide explanation for 48. Momentum is conserved, so if a 100kg object moves 2m to the right, shouldn't another 100kg object touching the original one move 2m to the left? Thus, option A, not B?
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Old Posted: 10/11/2014 4:01:47 PM   #11
 
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Default  PS #49

Please provide reasoning of #49. It's at equilibrium, so there's NOTHING in beaker A? It's ALL in beaker B? If volatile, why isn't some above/sides of beakers?
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Old Posted: 10/11/2014 4:05:18 PM   #12
 
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Default  BS #101

101. Molecule A is added in step 2 of the synthesis. What is the relationship between molecules A and B?

There is no reference to a Molecule B in the figures, scheme or passage. So how are we supposed to know what Molecule B is?
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Old Posted: 10/11/2014 4:10:37 PM   #13
 
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Default  BS 104

In the passage, it says there's an A-->T transversion in the mutant. However, there is no A in the 6th position. It's a T. So are we assuming the mutation is A-->T AND T-->A?

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Old Posted: 10/11/2014 4:20:09 PM   #14
 
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Default  BS #124

124. Carbonic anhydrase catalyzes the production of Co2 to carbonic acid in the first step of the following rxn: H2CO3- + H+ --> H2O + CO2. Which of the following statements is true concerning this run?

Correct: B. This reaction demonstrates one mechanism for increased blood pH as the blood enters the lungs.

How is B a better option than C: Heavy muscle activity pushes this reaction to the left in the tissues. Heavy muscle activity increases CO2 in tissues.
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Old Posted: 10/11/2014 4:34:33 PM   #15
 
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Default  VR Explanations

Can you please provide explanations for the Verbal Reasoning portion of the test? It is difficult to determine why an answer was wrong in this section, just by looking at the correct answer since there are some debatable points as to why one option is stronger than another.
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