doubling The rate of radioactive decay of carbon-14 is (A) process. B variable,
ID: 484292 • Letter: D
Question
doubling The rate of radioactive decay of carbon-14 is (A) process. B variable, eve several ousand years. (C) dependent upon the temp ery concentration of carbon in the sample. (E) dependent upon the platinum catalyst. (F a first-order process. (G) useful in determing the age of rocks millions of years old. 10. Consider the catalytic converter on an automobile, which converts pollutants to harmless compounds. Which is correct? (A) the catalyst makes the reaction faster by decreasing the quantity of heat AH evolved. (B) an ideal catalytic converter experiences a rapid destruction of platinum during the reaction. (C) the catalytic converter is intended to convert N to nitrogen oxides. (D) the catalyst makes the reaction faster by increasing Er (E) the catalytic converter is intended to convert carbon monoxide into carbon dioxide. 11. For the reaction A(g B(s), a pressure of A is measured vs time. The product B is nonvolatile. Then a plot of logarithm of the pressure of A vs time is found to be linear. What is the order of the reaction? (A) the reaction is first-order. (B) the reaction is zero order. (C) the reaction is second order. (D) the order cannot be determined, because a solid is produced. (E) there is no order, because the product has no pressure. (F) the order is infinite, because when you divide by zero pressure you get infinity. 12. The reason that dry ice sublimes instead of melting (in a normal laboratory or classroom) is: (A) the vapor pressure is above 1 atm. (B) the critical point is above 1 atm. mass (C) the triple point is above 1 atm. (D) the molar mass of dry ice is greater than the molar of air. (E) the dry ice has no water. a hydrogen-bonding (A) CH4. (B) H1o. (C) HF. (D) NH,. tExplanation / Answer
9)
All radioactive decay is 1st order reaction
Answer: F
10)
all catalytic converter aims at converting harmful gases to less harmful ones
Answer:" E
11)
ln [A] vs t is linear for 1st order reaction
the integrated rate law for 1st order reaction is:
ln [A] = –kt + ln [A]o
This is linear
Answer: A
12)
The pressure is always 1 atm in normal condition
the correct reason is that triple point lies above 1 atm
Answer: C
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