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課程名稱︰普通化學乙上
課程性質︰系定選必修
課程教師︰簡淑華
開課學院：生農學院
開課系所︰森林環資系
考試日期（年月日）︰2007/11/14
考試時限（分鐘）： 兩節課
是否需發放獎勵金： 是
（如未明確表示，則不予發放）
試題 :
1.Provide chemical formulas for the folllowing materials: [10%]
(1)tin(IV) oxide (2)ferrous sulfate (3)sodium carbonate
(4)dinitrogen pentoxide (5)hypochlorous acid (6)calcium hypochlorite
(7)hydrochloric acid (8)ammonium hydroxide (9)butane
(10)oxalate ions
2.Fill up the following blanks: [6%]
(1)1.5 femtosecond = __ second (2)3.0 nanometer = __ m
(3)0.20μg = __ g (4)1.0L = __ cm^3 (5)1 mole of Hˇ2 = __ hydrogen atoms
(6)(mass of a proton)/(mass of a electron)≒__
3.Briefly explain or distinguish the following terms: [20%]
(1)anions and cations (2)catalyst and catalysis
(3)accuracy and precision (4)alkanes,alkenes and alkynes
(5)extensive and intensive properties (6)mass number and atomic mass
(7)noble gases and noble metals (8)solute and solvent
(9)CFCs,HCFCs and HFCs(compounds used as refrigerants)
4.Answer the following questions: [24%]
(1)What is the difference between Sˇ8 and 8S? Use this example to explain why
subscripts in the formula must not to be changed.
(2)When sulfur is burned in air to produce sulfur dioxide,what is the limiting
reactant? Explain your answer.
(3)What factors determine whether a reaction can be classified as a redox
reaction?
(4)What volume of 0.210 M NaOH is required to neutralize 20.0 mL of 0.1050 M
HCl in an acid-base titration? How many moles of NaOH are needed for
neutralization?
(5)Calculate the mass percentage of each element in aluminum oxide.(Al,26.98 a
mu)
(6)What is the PH of a 2.0*10^-3 M aqueous solution of HClO4 ?
(7)What is the hydrogen ion concentration of turnip juice,which has a pH of
5.41 ?
(8)What are acids and base?Give the Arrhenius definition and the Bronsted-Lowr
y definition.
5.Combustion of a 34.8 mg sample of benzaldehyde,which contains only carbon,
hydrogen,and oxygen,produced 101 mg of carbon dioxide and 17.7 mg of water
[6%]
(a)What was the mass of carbon and hydrogen in the sample?
(b)Assuming that the original sample contained only carbon,hydrogen and oxygen
,what was the mass of oxygen in the sample?
(c)What was the mass percentage of oxygen in the sample?
(d)What is the empirical formula of benzaldehyde?
(e)Benzaldehyde has a molar mass of 106.12 g/mol.What is its molecular formula
?
6.Gold is extracted from its ores by treatment with aqueous cyanide solution,
which causes a reaction that forms the soluble [Au(CN)ˇ2]^- ion.The gold is
then recovered by reduction with metallic zinc,forming soluble[Zn(CN)ˇ4]^2-
ion in solution. [6%]
(a)Write the balanced chemical equation.
(b)What mass of gold would you wxpect to recover from 500.0 L of a 3.0*10^-4 M
solution of [Au(CN)ˇ2]^-(Au,197.0 amu;Zn,65.41 amu;N,14.01 amu;C,12.01 amu)
7.Predict what happens when each experiment is carried out.If a reaction occur
s,write the net ionic equation and the complete ionic equation for the
reaction. [15%]
(a)Platinum wire is dipped into hydrochloric acid.
(b)Hydrogen gas is bubbled through a solution of lead(II) nitrate.
(c)A strip of aluminum foil is placed in an aqueous solution of silver nitrate
(d)A few drops of liquid mercury are added to an aqueous solution of lead(II)
acetate
(e)Some sulfuric acid from a car battery is accidentally spilled on the lead
cable terminals.
8.Decide whether each compounds forms an aqueous solution that is strongly
acidic,weakly acidic,strongly basic,weakly basic,or nearly neutral:
(a)hydrobromic acid; (b)acetic acid; (c)lithium hydroxide;
(d)sodium acetate; (e)ammonium cholride; (f)potassium nitrate
(g)methylamine [7%]
9.Bromine atom contains 35 protons, write the symbols for its isotopes with 44
and 46 neutrons. Given the exact mass of the former is 78.9183 amu and 50.69
% abundance, the later one has mass of 80.9163 amu and 49.31% abundance,
calculate the atomic mass of bromine. [6%]
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※ 編輯: wujohnwu 來自: 140.112.241.90 (11/14 23:14)
※ 編輯: wujohnwu 來自: 140.112.241.90 (11/14 23:15)
※ 編輯: wujohnwu 來自: 140.112.241.90 (11/14 23:15)