[試題] 101上 佘瑞琳 普通化學甲 第一次期中考
課程名稱︰普通化學甲
課程性質︰必修
課程教師︰佘瑞琳
開課學院：工學院
開課系所︰化工系
考試日期（年月日）︰2012/10/17
考試時限（分鐘）：110 min
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
Atomic mass(in amu) : H = 1.00, C = 12.04, O = 16.00, K = 39.10, Cl = 35.45,
Br = 79.90
Na = 22.09, P = 30.98
R = 0.082 L-atm/mol-k = 8.314 J/mol-K; 1 L-atm = 101.32J
I.Multiple choice (There maybe more than one correct answers. 2 points each,
20%)
1.For the following measurements, choose the one that has two significant
figures.
(a) 0.022g (b)24.0℃ (c)205ml (d)2.16 * 10^2 mmHg
-> a
2.Which of the following calculations show two significant figures in the
answer ?
(a)406 * 0.0022
(b)0.4581 + 0.12 - 0.037
(c) (1.40 * 10^2 )(8.76 * 10^-4)/(9.2 * 10^-3)
(d)(8.002 + 0.3040)/(13.4 - 0.066 + 1.02)
-> abc
3.Choose the one which shows the correct conversion.
(a)127 mL = 1.27 L (b)5.0 μL = 5.0 * 10^-6 L (c)15 nm = 1.5 * 10^-9 m (d)93
K = -180 °C = -292 °F
-> bd
80 2-
4.For the anion of 34 Se , it has
(a)34 protons (b)34 electrons (c)80 neutrons (d)80 neucleons
-> ad
5.Which if the following element is metalloid ?
(a)Ca (b)Co (c)As (d)P4
-> c
6.Which solution is the best electrical conductor ?
(a)0.025M Ba(NO3)2 (b)0.030M RbNO3 (c)0.060M CH3COOH (d)0.60M CH3CH2OH
-> a
7.Which of the following is redox reation ?
(a)Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
(b)NH3(g) + HCl(g) → NH4Cl(s)
(c)2H2O2(aq) → O2(g) + H2O(l)
(d)K2CrO4(aq) + 2H+(aq) → K2CrO4(aq) + H2O(l)
-> ac
8.Whcih of the following underlined atom shows the highest oxidation state ?
(a)H2O2 (b)Al2O3 (c)CH4 (d)OF2
^ ^ ^ ^
-> d
9.Separate samples of an unknown salt are treated with dilute solutions of
HCl, H2SO4, and NaOH. A precipitate forms in all three cases. Which of the
following could be the cation of the unknown salt?
2+ 2+ 2+ 2+
(a)Ba (b)Hg2 (c)Cu (d)Pb
-> d
10.A gas is confined to a cylinder under constant atmospheric pressure. When
the gas undergoes a particular chemical reaction, it absorbs 723J of heat
from its surroundings and does 65J of P-V work on its surroundings.
(a)q = +723J (b)w = +65J (c)△U = 788J (d)△H = +723J
-> ad
II.Problems(80%)
1. Name or give the chemical formula for the following compounds.(20%)
(a)N2O5 (b)Fe(OH)3 (c)NaHCO3 (d)ZnS (e)HClO2
(f)CH3CH=CH2 (g)hydrosulfuric (h)nitric acid
(i)calcium dihydrogen phosphate (j)2-methyl-1-pentanol
2.Represent the succinic molecule, HOOCCH2CH2COOH, trough empirical,
molecular, structural, and line-angle formula.(6%, p.71)
3.For the following compounds indicate and name the functional groups.(6%)
(a) (b)
H NH2
| |
CH3CH2 – C –CHO H3C - C - COOH
| |
CH3 H
4.Write the balanced equation for the reation.(6%)
(a)PbO + NH3 → Pb + N2 + H2O
_ _ _
(b)MnO4 (aq) + CN (aq) → MnO2(s) + OCN (aq) (in basic solution)
_ _
(c)Cl2(g) → Cl (aq) + ClO3 (aq) (in basic solution)
5.Sorbitol, usded as a sweetener, has a molucular mass of 182 u and a mass
percent composition of 39.56% C, 7.74% H, and 52.70% O. What are the
empirical and molecular formulas of sorbtol? (6%, p.81)
6.Formaldehyde, CH2O, can be made from methanol by the following reaction,
using a copper catalyst. CH3OH(g) → CH2O(g) + H2(g). If 25.7g CH2O(g) is
produced per mole og methanol that reacts, what are
(a) the theoretical yield
(b) the actual yield
(c) the percent yield (6%, p.133)
7.Two solutions, 25.00 mL of 2.50 M HCl(aq) and 25.00 mL of 2.50 M NaOH(aq),
both initially at 21.1°C, are added to a Styrofoam-cup, calorimeter and
allowed to react. The temperature rises to 27.8°C.
(a)Determine the best of neutralization reation, expressed per mole off H2O
formed.
(b)Is the reaction endothermic or exothermic ?
(c)IS this the qv or qp ?
Ignore the small heat capacity of the Styrofoam cup and assume the density
and specific heat is same as water(s = 4.184 J/g°C)(8%, p.251)
8.Given that △Hf°[AgI(s)] = -61.84 kJ/mol, what is the standard enthalpy
change for the precipitation of silver iodide ? (4%, p.274)
9.Ants release formic acid (HCOOH) when they bite. Use the data in Table7.2
and the standard enthalpy of combustion for formic acid (△H° = -255 kJ/mol)
to calculate the standard enthalpy of formation for formic acid. Write the
formation reaction equation first. (4%, 7.93)
10. The heat of combustion of 2-propanol at 298.15 K, determined in a bomb
calorimeter, is -33.41 kJ/g. For the combustion of one mole of 2-propanol,
determine (a)△U , and (b) △H . (10%, 7.65)
11.A typical commercil-grade phosphoric acid is 75% H3PO4, by mass, and has
density = 1.57 g/mL. Calculate (a)the molarity and (b)molality of acid. (4%)
PS.附 TABLE 7.2, TABLE 7.3
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