For which of the following reactions is ΔH∘rxn equal to ΔH∘f of
the product(s)? a) Li(s)+12F2(l)→LiF(s) b) H2(g)+12O2(g)→H2O(g)
c)2H2(g)+O2(g)→2H2O(g) d) 2Li(s)+F2(g)→2LiF(s) e)
Li(s)+12F2(g)→LiF(s) f) H2O2(g)→12O2(g)+H2O(g)
Choose the reactions (or processes) that are expected to have a
negative value for ∆S°.
(Select all that apply.)
4Al(s)ᅠ+ᅠ3O2(g) →
2Al2O3(s)
NaCl(s) → Na+(aq) +
Cl-(aq)
CH3OH(g) +
3/2O2(g) →
CO2(g) + 2H2O(l)
SiO2(s) + 3C(s) → SiC(s) +
2CO(g)
I2(g) → I2(s)
Choose the reactions (or processes) that are expected to have a
positive value for ∆S°.
(Select all that apply.)
H2O(l) → H2O(s)
2N2O5(g) →
4NO2(g) + O2(g)
Fe(s) + 5CO(g) →
Fe(CO)5(l)
4NH3(g) + 7O2(g) →
4NO2(g) + 6H2O(g)
2NH3(g) → N2(g) +
3H2(g)
Consider the following equilibrium for the exothermic reaction:
2NaHSO3(s) <=> Na2SO3(s) +H2O(g) +SO2(g)
How will the equilibrium shift when each of the following
changes are made separately? Answer with shift towards products,
shift towards reactants or no shift. Provide a reason for your
choice.
a.) Adding H2O to the reaction vessel:
b.) Adding Helium to the reaction vessel:
c.) Removing Na2SO3:
d.) Increasing the volume of the reaction vessel:
e.) Increasing the temperature of the reaction vessel:
Consider the following reaction:
2Mg(s)+O2(g)→2MgO(s)ΔH=−1204kJ
Part A
Is this reaction exothermic or endothermic?
exothermic
endothermic
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Correct
Part B
Calculate the amount of heat transferred when 3.56 g of
Mg(s) reacts at constant pressure.
ΔH =
kJ
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Part C
How many grams of MgO are produced during an enthalpy change of
-231 kJ ?
m =
g
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Part D
How many kilojoules of heat are absorbed when 40.7 g of
MgO(s) is...
Which of the following processes is/are exothermic?
may select multiple answers.
1. breaking of a Cl-Cl bond
2. electron affinity of oxygen
3. combustion of methane
4. formation of ionic compounds from its ions
5.ionization of a lithium atom
1. Let g(s) = √ s. Find a simple function f so that f(g(s)) = 0.
Hint: see Methods of computing square roots on Wikipedia. Use
Newton’s method to estimate √ 2. Start with 3 different (and
interesting) initial values of your choice and report the number of
iterations it takes to obtain an accuracy of at least 4 digits.
In python.
The following reaction is exothermic:
2SO2(g) + O2(g)
<=> 2SO3(g)
a. What is the effect of increasing the
temperature of the reaction mixture?
b. What effect would an increase in pressure
have on the reaction mixture?
c. what effect would it have when SO3 is
removed from the reaction mixture?
The formation of tetrafluoroethylene from its elements is highly
exothermic:
2F2(g) + 2C(s) ↔ F2C=CF2(g)
(a) If a mixture of F2, graphite, and C2F4 is at equilibrium in
a closed container, will the reaction go to the right or to the
left in F2 is added?
(b) Rare bacteria from the planet Teflon eats C2F4 and make
Teflon for their cell walls. Will the reaction go to the right or
to the left if these bacteria are added?
(c) Will...