1) a- 27.67; produced b- 27.67; consumed c- 304.0; consumed d- 304.0; produced e
ID: 774771 • Letter: 1
Question
1)
a-27.67; produced b-
27.67; consumed c-
304.0; consumed d-
304.0; produced e-
110.7; consumed
2) Consider the reaction shown:
N2 + O2 ? 2 NO ?H = 43.2 kcal
When 50.0 g of N2 react, ________ kcal will be ________. Answer a-
77.1; consumed b-
2160; consumed c-
77.1; produced d-
2160; produced e-
43.2; produced
3) All of the statements are true for spontaneous reactions except Answer a-
the reaction rate is determined by the value of ?G. b-
the value of ?G is less than zero. c-
they are said to be exergonic. d-
if the enthalpy change is unfavorable, they occur at a high temperature. e-
the value of ?G is unaffected by a catalyst.
4) For a chemical reaction to occur, all of the following must happen except Answer a-
reactant particles must collide with enough energy for change to occur. b-
reactant particles must collide with the correct orientation. c-
chemical bonds in the reactants must break. d-
chemical bonds in the products must form. e-
a large enough number of collisions must occur.
5) In the reaction A + B ? AB, which of the following will not increase the rate? Answer a-
adding a catalyst b-
adding B c-
adding A d-
decreasing the temperature e-
increasing the temperature
6) Which of the properties of radioisotopes make them useful as tracers in medical or agricultural applications?
i. Their chemical behavior is the same as nonradioactive isotopes.
ii. They emit various types of radiation.
iii. The nuclear reaction is unaffected by the chemical state of the isotope. Answer a-
i and iii b-
i and ii c-
i only d-
none of these e-
all of these
7) Which type of radiation is attracted toward a negative plate? Answer a-
? and ? b-
? c-
? d-
? e-
none of these
8) Can be considered as the combination of a proton and an electron: Answer a-
neutron b-
positron c-
gamma ray d-
beta particle e-
alpha particle
9) What other product is formed when one neutron interacts with uranium-235 to form bromine-87 and 3 neutrons? Answer a-
La-148 b-
Xe-148 c-
La-146 d-
La-145 e-
Xe-145
10) Approximately how old is a fossil that has a little more than 6% of its original radioactivity? The half-life of carbon-14 used in dating artifacts is 5700 years. Answer a-
11,400 years b-
57,000 years c-
20,000 years d-
34,200 years e-
5,700 years
Explanation / Answer
1. B
2. C
3. B
4. D
5. B
6. C
7. A
8. B
9. c
10. D
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