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Student A investigated the rate of reaction between calcium carbonate (marble chips) and hydrochloric acid. The student collected 10.0 cm3 of gas produced after 15 seconds.Student B investigated the rate of reaction between magnesium and hydrochloric acid. The student collected 19.5 cm3 of gas produced after 10 seconds.Which student’s investigation had a faster rate of reaction?
Which of the following statements are INCORRECT?
a.
In a bond, A-Y, the electronegativity difference between of two atoms determine how the A-Y bond breaks.
b.
If the atoms, A and Y, in the compound, AY, has electronegativity values that are almost the same, then the A-Y bond is polar.
c.
The electronegativity of elements on the periodic table increases going from left to the right in each row.
d.
Electronegativity is the property of the atoms forming a given bond, which determines the polarity of the bond.
Consider the following two compounds:
CH3CH2CH2CH2CH3 and (CH3)2CHCH2CH3
Which statement below is INCORRECT?
a.
(CH3)2CHCH2CH3 has the higher boiling point
b.
CH3CH2CH2CH2CH3 has the higher boiling point.
c.
Greater surface area leads to more intermolecular attraction which results in a higher boiling point.
d.
As the degree of branching increases, the surface area of the molecule decreases and the potential for intermolecular attraction via London forces decreases.
The reaction of bromine with propane in the presence of high heat or uv light gives primarily 2-bromopropane as the reaction product because:
a.
bromine forms reactive free radicals.
b.
propane easily forms free radicals
c.
bromine reacts with any alkane to produce predominantly a secondary carbon free radical intermediate.
d.
secondary carbon free radicals are more stable than primary carbon free radicals
Which of the following statements are INCORRECT?
a. Free radicals contain an unpaired electron.
b.Carbocations are electrophilic.
c.Carbanions are strongly acidic.
d.Carbocations are acidic.
The donation of electron density through sigma (σ) bonds of a molecule is called the:
a.
steric effect
b.
inductive effect
c.
nucleophilic effect
d.
resonance effect
Consider the following molecule:
Which statement is INCORRECT?
a.
The molecule has (R)- configuration.
b.
With the lowest (fourth) priority facing away from the viewer, a curved arrow drawn from the first (highest) priority group through the second priority group to third priority group points in a counterclockwise direction.
c.
The molecule has (S)- configuration.
d.
The highest priority group is OH and the lowest priority group is H.
The absolute configuration of a chiral carbon is defined as R- or S- according to the Cahn-Ingold-Prelog rules. What is the CORRECT name for the following compound?
a.
(S)-3-methylheptane
b.
(R)-3-methylheptane
c.
(R)-2-ethylhexane
d.
(S)-2-ethylhexane
Let z be the random variable representing the number of blue balls. Find the values of the random variable Z.
A group of students got the following scores in an achievement test: 9, 12 15, 18, 21 and 24. Consider samples of size 3 can be drawn from this population.
B. Construct the sampling distribution of the resulting sample means
