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Chem 162 final review.
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Chem 162 final review.
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Chem 162 final review1) What is the pH of a solution of 0.020 M HNO3? - CORRECT ANSWER-
2.) Which of the following is the strongest acid?
a) H2SeO3 b) H2SeO c) H2SeO2 d) all the same e) none - CORRECT
ANSWER-a) H2SeO3
-the more oxygens, the stronger the acid
3.) What is the pH of a 0.0050 M solution of sodium cyanide? (HCN Ka = 6.2 x
10-10)
a) 7.5 b) 10.4 c) 11.8 d) 8.2 e) none - CORRECT ANSWER-b) 10.4
5.) Calculate the molar solubility of lead iodide in water from its Ksp at 25 °C.
(Ksp = 7.9 x 10-9
)
a) 7.9 x 10-9
b) 2.0 x 10-9
c) 1.3 x 10-3
d) 5.3 x 10-3
e) none - CORRECT ANSWER-c) 1.3 x 10^-3
6.) Write a balanced chemical equation for the complete combustion of C6H6
(benzene) (in the presence of
excess oxygen) and pick the right molar amounts of CO2 and H2O. - CORRECT
ANSWER-D) 12 and 6
2C6H6(l) + 15O2(g) 12CO2(g) + 6H2O(g)
7.) Balance the reaction
Sn + NO3^- → SnO^2 + NO occurring in an acidic solution. The correct
coefficient for SnO^2 is? - CORRECT ANSWER-c) 3
8.) For the problem above what is the correct coefficient for NO3^- is? -
CORRECT ANSWER-b) 4
, 9.) Is an isotope and an allotropy the same thing?
a) yes b) no c) sometimes d) not enough info e) none of the above - CORRECT
ANSWER-b) NO
--isotope--each isotope of a given element has a different mass number.
--allotropy=the property of some chemical elements to exist in two or more
different forms, in the same physical state, known as allotropes of these
elements.
10.) Complete the following nuclear reaction and pick the correct product;
^220Rn --> ^4He + ??? - CORRECT ANSWER-c) ^ 216Po
^216Po
84
11.) Which is the correct symbol for a bismuth-211 atom that has decayed by
beta emission?
a) 211Pb b) 212Bi c) 212Pb d) 210Tl e) none - CORRECT ANSWER-e) none
211Bi -->
0/-1 e^- + 211Po
13.) Although lead-164 has two magic numbers, 82 protons and 82 neutrons, this
isotope is unknown. Lead-
208, however, is known and stable. Which statement best accounts for the
nonexistence of lead-164?
a) not enough neutrons
b) too many protons
c) Atomic number is more than bismuth
d) too many neutrons
e) neutron-proton ratio is to high - CORRECT ANSWER-a) not enough neutrons
The neutron-to-proton ratio of lead-164 is too low. It has too few neutrons for the
number of protons
in the nucleus.
12.) What percentage of cesium chloride made from cesium-137 (t1/2= 30 yr;
beta emitter) remains after
150 yr? - CORRECT ANSWER-3.1 %
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