CHEM 101 FINAL EXAM REAL EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) A GRADE
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Course
CHEM 101
Institution
CHEM 101
CHEM 101 FINAL EXAM REAL EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) A GRADE
Changes in energy can take place in what two forms?
a. potential and kinetic energy
b. heat and work
d. heat and temperature
c. thermofission and nucleosis - Answer b. heat and work
The law of conservat...
CHEM 101 FINAL EXAM REAL
EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS)
A GRADE
Changes in energy can take place in what two forms?
a. potential and kinetic energy
b. heat and work
d. heat and temperature
c. thermofission and nucleosis - Answer ✔ b. heat and work
The law of conservation of energy states that in chemical and physical changes, ___.
a. Energy is not created or destroyed
b. Energy is always released to the surroundings
c. Exothermic changes are favored
d. The universe increases the amount of energy - Answer ✔ a. Energy is not created or
destroyed
The mixture of gas and air inside a cylinder reacts, releasing 300 kJ of heat. If the
system does 150 kJ of work on the piston, what is the change in total energy?
a. 450 kJ
b. -45000 kJ
c. 150 kJ
d. -150 kJ - Answer ✔ a. 450 kJ
How much heat is required to raise the temperature of 125 grams of water by 10.0 °C?
(q = msDT,
s = 4.184J/goC)
a. 1250 J
b. 12.5 J
c. 10.0 J
d. 5230 J - Answer ✔ d. 5230 J
The following reaction is an example of an ___ reaction.
2 K (s) + Cl2 (g) --> 2 KCl (g) ΔHrxn = -873.0 kJ
a. exothermic
b. endothermic
c. endergonic
, d. ergonomic - Answer ✔ a. exothermic
a chemical change always involves a change in the _________ of matter - Answer ✔
composition
which of the following is an endothermic process?
A. burning wood in a fireplace
B. heating water to convert it to steam
C. burning gasoline in a combustion engine
D. digesting food - Answer ✔ b. Heating water to convert it to steam
A highly reactive chemical compound reacts with another compound and produces
products that are more stable than the initial reactants. During this chemical reaction
heat was released. According to this information this reaction was ____________. -
Answer ✔ exothermic
which undergoes continued testing and refinement so that we know more about how
something happens in nature? - Answer ✔ theory
which of the following is equal to 0.00539?
a. 5.39 x 10^3
b. 5.39 x 10^2
c. 5.39 x 10^-3
d. 5.39 x 10^-2 - Answer ✔ c. 5.39 x 10^-3
a student measures the volume of a solution to be 0.03010 L. how many significant
digits are in this measurement? - Answer ✔ 4
a solution has a mass of 15.03 grams, and a volume of 14.4 mL. what is the density of
this solution, reported to the correct number of significant digits? - Answer ✔ 1.04 g/mL
a sample of metal has a mass of 0.0793 grand. what is this mass in milligrams? -
Answer ✔ 79.3 mg
which of the following is equal to 1 mL? - Answer ✔ 1 cm^3
a car is moving at 60.0 miles/hr. How many feet/sec is the driver travelling? 1 mile =
5,280 ft. - Answer ✔ 88 ft/sec
which temperature is the coldest?
a. 116 K
b. -20 C
c. -105 F
d. Unable to verify since all temperatures are the same. - Answer ✔ a. 116 K
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