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MCAT Organic Question — Acidic Conditions

September 18, 2014

What is the product of water and ethyl ethanoate under acidic conditions?

 

a) ethanoic acid and ethanol

b) butanol and water

c) ethanoic acid, 2 equivalents

d) ethanol, 2 equivalents

 

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MCAT Chemistry Question — Hypothetical Reaction

September 17, 2014

Consider the following hypothetical reaction:

 

Q2 (g) + AX4 (g) → 2 QX2 (g) + A (g) ΔH = 23.4 kJ / mol

 

Which of the following is true regarding this reaction?

 

A) Spontaneous at all temperatures
B) Nonspontaneous at all temperatures
C) Spontaneous at low temperatures
D) Spontaneous at high temperatures

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MCAT Biology Question — Natural Selection

September 16, 2014

The Modern Synthesis in evolutionary biology reflects the current consensus about how evolution proceeds. According to the modern synthesis, which of the following is a correct characterization of a principle of natural selection?

 

A) Most mutations that occur in a species that is well-adapted to its niche are likely to be harmful.
B) Those individuals within a species that reproduce in the greatest numbers are fittest.
C) Genetic drift has no impact on the overall gene distribution in a population.
D) Ecosystems across all niches can only support a finite population of each organism.

 

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MCAT Physics Question — Acceleration

September 15, 2014

A block has weight W and mass m, is pulled by tension T at angle θ with the horizon, and experiences a force of friction, Fk, opposing its motion across a rough surface. If the box moves a distance d, what is the acceleration of the box?

 

acceleration

a) Fkd/W

 

b) (T-W-Fk)g/W

 

c) (Tcosθ – Fk)g/W

 

d) (Tsinθ – Fk>)/W

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MCAT Organic Question — Isobutyric Acid

September 12, 2014

In order to extract isobutyric acid from a solution of diethly ether, one should wash the solution with:

 

a) 1 30mL wash of water

b) 3 10mL washes of water

c) 1 30mL wash of hexane

d) 3 10mL washes of hexane

 

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MCAT Physics Question — Resultant Force

September 11, 2014

A 4N and an 8N external force act on an object. What is a possible magnitude of the resultant force on the object from the two forces?

 

a) 0N

b) 2N

c) 4N

d) 16N

 

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MCAT Chemistry Question — Hydrogen Bonds

September 10, 2014

Hydrogen bonds form between H2O molecules, but not H2S, H2Se, or H2Te. This explains why:

 

a) H2O is liquid at room temperature while the other compounds are gases.

b) H2O is more volatile than the other compounds.

c) H2O has the highest molecular weight of all four compounds.

d) H2O has a more distinct aroma than the other compounds.

 

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MCAT Physics Question — Electric Field

September 9, 2014

The distance from a point charge is tripled. What is the ratio of the strength of the electric field at the original distance to the strength of the field at the new distance?

 

a) 9:1

b) 3:1

c) 1:3

d) 1:9

 

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MCAT Biology Question — Sweating

September 8, 2014

Sweating through the skin primarily affects:

 

a) body temperature regulation

b) plasma osmolarity

c) bodily salt balance

d) extracellular fluid levels

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MCAT Organic Question — Cram’s Rule

September 5, 2014

When an optically inactive reagent and a racemic mixture of an optically active compound are mixed, it can create an optically active product from an initially optically inactive set of reagents. Such a process was described by Donald Cram when formulating Cram’s rule when mixing 2-phenylpropionaldehyde and bromobenzene.

 

This process can best be described as:

A) Electrophilic substitution

B) Nucleophilic substitution

C) Racemization

D) Enantioinduction

 

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