如題
雖然不是我們老師的考古題
但重點永遠不會變的(大家將就將就用吧= =)
為保護發文人的安全
以下有關作者資料一切以---馬---賽---克---處理
自己中譯吧!!
我英文差得很= =|||
--------------馬-------------賽-------------克----------------
標題: [試題] 彭旭明 普化甲 93上期中
--------------馬-------------賽-------------克----------------
課程名稱︰普通化學甲
課程性質︰
課程教師︰彭旭明
開課系所︰
考試時間︰2004.11.12 18:30~20:50
試題 :
1. The common names and formulas for several substances are given
below. What
are the systematic names for these substances? (8%)
a. sugar of lead Pb(C2H3O2)2 e. milk of magnesia Mg(OH)2
b. blue vitriol CuSO4 f. gypsum CaSO4
c. quicklime CaO g. laughing gas N2O
d. Epsom MgSO4 h. White vitriol ZnSO4
2. Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative
and
hypnotic. It is the compound used to make "Mickey Finns" in
detective
stories. (10%)
Ⅰ. a. Calculate the molar mass of chloral hydrate.
b. How many moles of C2H3Cl3O2 molecules are in 500.0g chloral
hydrate?
c. What is the mass in grams of 2.0*10^-12 mole chloral
hydrate?
d. How many chlorine atoms are in 5.0g chloral hydrate?
e. What mass of chloral hydrate would contain 1.0g Cl?
f. What is the mass of exactly 500 molecules of chloral
hydrate?
Ⅱ. If only chlorine consists of two isotopes, 75% 35Cl and 25%
37Cl.
What would be the distribution of parent peak for chloral
hydrate in
mass spectrum?
3. In a given experiment with a test engine, gasoline (assume the
average
composition is C8H18) and air undergo combustion according to the
following equation:
a C8H18(l) + b O2(g) —→ c CO2(g) + e CH4(g) + f H2(g) + gH2O(g)
The exhaust gas (products) was found to have the following
composition (by
volume):
11.5% CO2, 4.4% CO, 1.5% H2, 0.5% CH4, and 82.1% N2.
These measurements were made after all the water vapor had been
removed.
Assuming that the N2 goes through the engine unchanged and that air
consists of 21 mole percent O2 and 78 mole percent n2, determine
the
values of the coefficients as accurately as possible. (10%)
4. How would you separate the following ions in aqueous solution by
selective
precipitation? (8%)
a. Ag+, Ba2+, and Cr3+
b. Ag+, Pb2+, and Cu2+
c. Hg2 2+ and Ni2+
5. A 10.00-ml sample of vinegar, an aqueous solution of acetic acid
(HC2H3O2)
,is titrated with 0.5026M NaOH, and 16.58 ml is required to reach
the
endpoint. (8%)
a. What is the molarity of the acetic acid?
b. If the density of the vinegar is 1.006 g/cm3, what is the mass
percent
of acetic acid in the vinegar?
6. A mixture contains only sodium chloride and potassium chloride. A
0.1586-g
sample of the mixture was dissolved in water. It took 22.90 ml of
0.1000M
AgNO3 to completely precipitate all the chloride present. What is
the
composition (by mass percent) of the mixture? (6%)
7. A series of solutions known to contain one or more of the following
constituents was titrated with 0.100N base: HCl, H3PO4, and
NaH2PO4. The
data shown below give the volumes (mL) of reagent required to reach
an end
point at pH 4 to 5 (product Nah2PO4) and pH 9 to 10 (product
Nah2PO4) when
25.0 mL aliquots were titrated. Calculate the composition of each
solution
in molarity (M). (15%) Ka1=7.5*10^-3 Ka2=6.2*10^-8
Ka3=4.8*10^-13
a. 10.2 and 20.4
b. 10.2 and 10.2
c. 10.2 and 30.7
d. 0.0 and 19.1
e. 20.2 and 27.6
8. Consider separate 1.0-L samples of O2(g) and He(g), both at 25。C
and the
same pressure. Compare the change in momentum per impact and the
number
of impacts per second in the two samples. (8%)
9. Calculate the intermolecular collision frequency and the mean free
path in
a sample of helium gas with a volume of 5.0-L at 27。C and 3.0atm.
Assume
that the diameter of a helium atom is 50 pm.
Collision rate (per second) = Z =
[2^(1/2)](N/V)(d^2)[(πRT/M)^(1/2)] (8%)
10. The density of a pure gaseous compound was measured at 0.00。C as a
function of pressure to give the following results:
Density (g/L) Pressure (atm)
-------------------------------------------
0.17893 0.2500
0.35808 0.5000
0.53745 0.7500
0.71707 1.000
Calculate the molar mass of this compound, corrected for any
nonideal
behavior of the gas. Assume the nonideal gas obeys the equation
PV/nRT = 1 + βP. (R = 0.08206 L atm K^-1 mol^-1) (10%)
11. An important reaction for the commercial of hydrogen is
CO(g) + H2O(g) ←→ H2(g) + CO2(g) (Exothermic)
How will the equilibrium position shift in each of the following
cases?
(5%)
a. Gaseous carbon dioxide is removed.
b. Water vapor is added.
c. The pressure is increased by adding helium gas.
d. The temperature is increased.
e. The pressure is increased by decreasing the volume of the
container.
12. At 207。C, Kp = 0.267 atm for reaction PCl5(g) ←→ PCl3(g) +
Cl2(g) (8%)
a. If 0.100 mol of PCl5(g) is placed in an otherwise empty 12.0-L
vessel
at 207。C. calculate the partial pressure of PCl5(g), PCl3(g),
and
Cl2(g) at equilibrium.
b. In another experiment, the total pressure of an equilibrium
mixture is
2.0 atm at 207。C. What mass of PCl5 was introduced into a
5.00-L
vessel to reach this equilibrium position?
13. Arrange the following 0.10M solutions in order from most acidic to
most
basic: CaBr2, KNO2, HClO4, and NH4NO2 (5%)
14. The equilibrium constant Ka for the reaction
[Fe(H2O)6]3+(aq) + H2O(l) ←→ [Fe(H2O)5(OH)]2+(aq) + H3O+(aq)
is 6.0*10^-3. (9%)
a. Calculate the pH of a 0.10M solution of [Fe(H2O)6]3+.
b. Calculate the pH necessary for 99.90% of the iron(Ⅲ) to be in
the
form [Fe(H2O)6]3+.
c. Will a 1.0M solution of iron(Ⅱ) nitrate have a higher or lower
pH
than a 1.0M solution of iron(Ⅲ) nitrate? Explain.
15. Mix equal volumes of one solution from Group Ⅰ with one solution
from
Group Ⅱ to achieve the results below. Calculate the pH of each
solution.
(12%)
Group Ⅰ: 0.20M NH4Cl, 0.20M HCl, 0.2M C6H5NH3Cl, 0.2M (C2H5)3NHCl
Group Ⅱ: 0.20M KOI, 0.20M NaCN, 0.20M KOCl, 0.20M NaNO2
Ka for HNO2 = 4.0*10^-4, Ka for [(C2H5)3NH]+ = 2.5*10^-11, Ka for
HOI =
2*10^-11
a. the solution with the lowest pH.
b. the solution with the highest pH.
c. the solution with the pH closest to 7.00.
--
有時只想獨自一人 ξ
拋開所有束縛 ‧─○
什麼都不做 ◢╲
只靜靜地坐著 √
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.112.240.102