SPRING 2008 – (NEW) FINAL
How much energy is needed to convert 180 grams of ice at -10 ºC to liquid water at 10 ºC? (The molar heat capacity of liquid water is 75.4 J/mol ºC; the molar heat capacity of ice is 40.2 J/mol ºC. The molar heat of vaporization of water is 40.7 kJ/mol. The molar heat of fusion of water is 6.02 kJ/mol.)
Which physical property of a liquid is NOT the result of strong intermolecular forces?
high vapor pressure
high boiling point
high heat of fusion (D)
high melting point
high heat of vaporization
Which of the following statements is TRUE?
Most gases are more soluble in liquids at higher temperatures. (B)
In any solution, the solvent has to be liquid.
The solubility of a gas in a liquid is inversely proportional to the pressure. (D)
If the heat of solution is negative for a solid in a liquid, then more solid will dissolve at lower temperatures. (E)
All of these statements are false.
Commercial concentrated sulfuric acid is 98.0 % by mass H2SO4 and has a density of 1.84 g/mL. Calculate the molarity of concentrated sulfuric acid.
The activation energy of a reaction is 37.6 kJ/mol and the rate constant is 5.4 x 10-3 s-1 at 45°C. What is the rate constant at 145°C?
5.4 x 10-3
8.4 x 10-3
Which of the following statements is correct for the reaction 2H2 + O2 → 2H2O(g)?
The rate of O2 disappearance is twice the rate of the H2 disappearance. (B)
The rate of H2 disappearance is twice the rate of the O2 disappearance. (C)
The rate of H2 disappearance is equal to the rate of the H2O disappearance. (D)
The rate of O2 appearance is equal to the rate of the H2 disappearance. (E)
The rate of H2 disappearance is equal to the rate of the O2 disappearance.
The following data were obtained for the reaction 2A → products.
What is the order of the reaction and why?
First because there is only one reactant species.
Second because the coefficient of A is 2. (C)
Zero because of the shape of the plot of [A] vs t.
First because the half-life remains constant. (E)
Second because the reaction rate decreases with time.
Given the initial rate data below for the reaction A(g) + B(g) → C(g) + D(g), what would the initial rate (in M/s) be if [A] = 0.10 M and [B] = 0.30 M?
2.2 x 10-3
4.4 x 10-3
8.8 x 10-3
(A) 3.3 x 10-3
(B) 1.7 x 10-3
(C) 1.4 x 107
(D) 9.9 x 10-3
(E) 3.3 x 10-2
Which of the mechanisms is most likely, given the observed experimental rate law?
HBr + CH3CH=CH2 → CH3CHBrCH3
rate = k[HBr]3[CH3CH=CH2]
HBr + HBr → H + HBr2
H + CH3CH=CH2 → CH3CHCH3
CH3CHCH3 + HBr2 → CH3CHBrCH3 + HBr
HBr + HBr → H2Br2
HBr + CH3CH=CH2 → CH3CHBrCH3
CH3CHBrCH3 + H2Br2 → CH3CHBrCH3 + 2 HBr
HBr + CH3CH=CH2 → H +
H + HBr → H2Br
CH3CHBrCH2 + H2Br → CH3CHBrCH3 + HBr
3 HBr + CH3CH=CH2 → CH3CHBrCH3 + H + HBr2
H + HBr2 → 2 HBr
Both (B) and (D) are equally likely.
Calculate the energy change (in MeV) during the fusion of protium (1H) with deuterium (2H) to make 3He, given the following information:
1H = 1.00794 amu
2H = 2.01410 amu
3He = 3.10603 amu
1 amu = 931.5 MeV
When 232Th decays, it begins a chain reaction that ends at a stable nucleus. Given that the chain goes in the order,...
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