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Worksheetspractice exam part 1 BOYD
Total questions: 29
Worksheet time: 23mins
How many grams of O2 are required to react with 32.0 moles of H2?
(a)
N2+3H2 ---->2NH3
How many grams of N2 can be produced from 2.45 g of H2?
(a)
2 Al + Fe2O3 ----> Al2O3 + 2 Fe
How many moles of Al will react with 90.0 g of Fe?
(a)
Suppose the theoretical yield in a reaction is 40.2 g and the percent yield is 30.9%. What is the actual yield of product obtained?
(a)
C10H8 + 12 O2 ---------> 10 CO2 + 4 H2O
In the reaction shown, how many moles of O2 are needed to react with 7.6 moles of H2O?
(a)
When a substance gain electrons it is _______________; the substance itself is acting as a (an) ____________ agent.
oxidized
reduced
oxidizing
reducing
What is the oxidation number of Phosphorus in HPO3
(a)
What is the oxidation number of Nitrogen in N2O4?
(a)
What is the oxidation number of calcium in CaI2?
(a)
Use this equation for the following few questions:
4Fe+3O2---->2Fe2O3.
What is the oxidizing agent?
(a)
Use this equation for the following few questions:
4Fe+3O2---->2Fe2O3.
What is the reducing agent?
(a)
Use this equation for the following few questions:
4Fe+3O2---->2Fe2O3.
What is being reduced?
(a)
Use this equation for the following few questions:
4Fe+3O2---->2Fe2O3.
What is being oxidized?
(a)
Use this equation for the following few questions:
P4+10Cl2---->4PCl5
What is being oxidized?
(a)
Use this equation for the following few questions:
P4+10Cl2---->4PCl5
What is being reduced?
(a)
If an element gains electrons, it will
increase in oxidation number
decrease in oxidation number
nothing will happen to the oxidation number
Is this reaction spontaneous or notspontaneous?
2H2+O2---->2H2O ∆H=+45.0kcal ∆S=-12.1
spontaneous
nonspontaneous
Is ∆G=-22.3 favorable?
yes
no
Select all the favorable values
∆H=+.2
∆S= +4
entropy= positive
enthalpy= positive
exergonic
Is this equation exothermic or endothermic?
2H2O+O2------->2H2O +∆H=+1.00 kcal
endothermic
exothermic
C3H8 + 5 O2 ∆H=+12.0kcal/mol ---------> 3 CO2 + 4 H2O
What is the sign of ∆H? Is it exo or endothermic?
+12.0 kcal/mol
-12.0 kcal/mol
endothermic
exothermic
P4+10Cl2---->4PCl5+ ∆H= + 500 kcal/mol
What is the value of ∆H? Is it exothermic or endothermic?
+500 kcal
-500 kcal
exothermic
endothermic
Which has the most entropy?
2 moles oxygen gas
2 moles water
3 moles water
3 moles oxygen gas
Is ∆S positive for this reaction?
2C2H6+7O2----->4CO2+6H2O
yes
no
2H2+O2---->2H2O ∆ G=-12.0kcal
As written, the reaction is _________, and the entropy of the system __________.
spontaneous
nonspontaneous
increases
decreases
N2+3H2 ---->2NH3
Will increasing the pressure favor the forward or reverse reaction
forward
reverse
Pressure tends to go towards the side with...
more moles
less moles
K = 9.0 x 10– 2
Are products or reactants favored?
products
reactants
K = 8.8 x 108
Are products or reactants favored?
products
reactants
