Chemistry Exam Questions
How many atoms of carbon are present in 0.66 moles of ethanol, C2H5OH? - ✔✔-7.9 x 10^23
Bond breaking _________ and is thus an ________ process. - ✔✔-requires energy; endothermic
Consider the
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Chemistry Exam Questions
How many atoms of carbon are present in 0.66 moles of ethanol, C2H5OH? - ✔✔-7.9 x 10^23
Bond breaking _________ and is thus an ________ process. - ✔✔-requires energy; endothermic
Consider the cooling curve shown below. What phase change and state of matter are represented by
I and III respectively - ✔✔-condensation; gas
Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide.
CaO (s) + H2O (l) -> Ca(OH)2 (s)
In a particular experiment, a 5.50 g sample of CaO is reacted with excess water and 6.77 g of
Ca(OH)2 is recovered. What is the percent yield in this experiment? Hint: First calculate the
theoretical yield!! - ✔✔-93.1%
What is the volume of 42.0 g of nitrogen, N2, gas at STP? - ✔✔-33.6 L
How much heat is absorbed when 45.00g of C(s) reacts in the presences of excess SO2 (g) to
produce CS2 (l) and CO(g) according to the following chemical equation?
5C(s) + 2SO2(g) -> CS2 (l) + 4 CO (g) /_\Ho= 239.9 kJ - ✔✔-179.8 kj
Which of the following types of crystalline solids have metal atoms arranged in regular geometric
patterns? - ✔✔-metallic
The reaction...
N2 (g) + 2H2 (g) -> 2NH3 (g) + 22 kcal
is _________, and therefore heat is _________ by the reaction. - ✔✔-exothermic; released
A compared to an uncatalyzed reaction, a catalyzed reaction has ___________ Ea, and is thus a
_________ reaction. - ✔✔-lower, faster
The formula weight of lead (II) carbonate, PbCO3, is _____ amu. - ✔✔-267.2
In which of the following pairs of physical change are both changes endothermic?
a. melting, vaporization
b. sublimation, condensation
c. melting, deposition
d. melting, condensa
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