日五初月五年丑辛
WAH KIU YAT PO 翻
其三第張七第
補助專上學校統一文憑考試 物理化學科試題
g. Jurie 15, Thursday
0.30 a.m. to 12.30 p.m.
CHEMISTRY PAPER II)
PHYSICAL CHEMISTRY
Answer STX questions
Potassium chloride crystals consist of a face-centered cubic lattice of potassium ions interlocked. with a similar lattice of chloride ions. Sketch a unit cell for the potassium chloride.crystal and deduce how many of each kind of ion are present per unit cell, Calculate the length of the edge of the unit cell from the
following datas.
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Density cf KCl`oryotal at 18°C., w ̇1,99 gram per_dos
Atomic weight. of potassium
IN
. chlorine」
Avogadro number
啼
39.1.
* 35.9
e 6.02 X 10°
1023..
How has X-ray diffraction of crystals been used to determine the wavelength of X-ray by the Bragg methodiy
Using the reaction:(
co (e) H2O (g)
(x82 (8)
as an example, show how the heat of reaction at 25°C can
吁
(caloulated from a table of heats of formation of compounda at
25°c. After A Ha98 of the above reaction is known. what other data are. required in orded to balculate AH1000
肇
Use symbols to show the method of calculating A 1000 from AH298Ì 3. (a). With the aid of temperature-vapor pressure: curves, explain
qualitatively that the boiling point elevation and freezing point 'depression of a solution containing non-electrolytes are related to the vapor pressure lowering.
(b) Starting from Clapeyron equation
dp. AH væg.
品
first derive the differential, form of Claudius-Clapeyron equation) and then derive the molal boiling point elevation constant in terms of the physical constants of the solvent. State the
assumptions involved in your derivation clearly. Evaluate the Ky for water. Heat of evaporation of water at 100°C 18.540 cal./gram. For the phase diagram of the condensed system potassium-sodium, state the phases present in each area. Explain the change in phases and. variances (both in number and in nature) when the areas and 'lines) are out-aorosa, by the dotted line, representing the slow cooling
of_the_welt, g+LA
10
Na
Nazk.
K
Mole % K
64
12°
日七十月六年一
補助專上學校統一文憑考試
化學試卷二 物理化學 任擇六題
一般公年十五國民/塞甲 二第張七第
六月十五日 上午九時半
氯化鉀結晶是由鉀離子的面心立方體與氯離子的同 祥晶體交錯結合而成畫出氯化钾結晶的單位晶格, 再推出此單位晶格中含有每種離子的數目由下列数 據計算此單位晶格的每邊長度:
KC)結晶在18°C的密度 1-99克/立方糖
鉀的原子量
氣的原子量
Avagaaro 常数
39-1
35.5
6.02 × 1023
如何能用 Bragg 的X射線結晶分析法來决定X射線的波長?
用下列反應前例
Co(氧)+ H2O)
Co2 (X) + M2 (8)
說明如何自化合物在25°C時的生成熱數值計算此反應 在25°C時的反應熱,已知此反應的ᅀH29 欲計算具△Hicco 時需要什麼其他數據?用符號說明由ᅀMage計算△H 1000 的方法
3(a) 藉温度一蒸氣壓曲線圖解釋非電解質溶液的沸點昇高與凝
固點降低與蒸氣壓減低的關係(不必推導公式)。 (b) Clapeyron 'n st
A H vap.
開始 T (W - V2)
dp
先導出 Clouses Clapeyron的微分公式,然後推導克分子沸 點昇高常歡K,與溶劑物理常数的關係清楚注明在推 中所做的假設條件.計算水的K值,已知水在100%的 氧化熱是540號
下面鉀與鈉凝縮系的相圖中,各面積內有些什麼相存 在當一熔液慢慢冷卻(圖中用虛線代表)經過各面積 各線時解釋相與自由度的數目與性質的爽记.
Tè 7°
- 12.
5. (a) Derive the characteristic equation for a second order reaction in
which the reactants are at the same concentration. Give an example
of such a reaction.
(b) Equal moles of X and Y are mixed. At the end of one hour, X is
25% reacted. What percentage of X will be left unreacted at the end of 3 hours from start if the reaction with respect to X is (i) zero order, (ii) first order, and (iii) second order in which equal parts of X and Y react?
6. (a) Explain the principle and experimental procedure of how to determine
the ionization constant of a weak electrolyte, such as acetic acid. by conductance method.
5) A buffer solution is 0.02 M in butyric acid and 0.05 M in sodium butyrate. Given K. for butyric acidis 1.52 x 10-5, calculate
a
奥
(1) the pH of this buffer solution, and (ii) the change in pH after adding 10 milliliters of 1 N hydrochloric acid to 1 liter of the buffer solution. (Assume concentration may be used for activity.) 7.(a) Derive the relationship between pH and E of a cell consisting of.
Glass electrode; H*(a.= ?) Normal calomel electrode, starting from two hydrogen electrodes connected as a concentration cell, (b) Calculate the equilibrium cosatant at 25°C for the redox reaction;
Ag Fe*** =
咖
** Ag*.
Fe⭑+
If excess finely divided metallic silver is adfed to 0.1 M solution.
of ferrio nitrate, what would be the concentration of silver ion at
equilibrium? Standard oxidation potentials;
Pt: Fo**, Fe 1 E * -0.771 volt
Agi Ag
;
E
= -0.799
Normal calomel electrode : E = -0.2802 volt)
Derive the Langmuir adsorption isotherm, stating the assumptions upon which it is based. To what form does the Langmuir isotherm reduce at low pressure' and at high pressure? Explain the physical significance
An each case,
Na
K
Nak
分子百分率
5 (a) 導出作用物濃度相等的二級反應特性方程式,並舉出一
這類反應的實例
(I)等分子量的X 與Y混合一小時後,25%的X起了作用,如 這反應對×是(a)零紅反應(L)一級反應(C)二級反應 則混合三小時後各有多少%的X尚中起作用?
6(a)說明用測定導電度以求得一弱電解質例如醋酸之離解
常數的原理及實驗方法。
(6)某緩衝溶液含有02 M T畯及0.05MT酸鈉,已知丁酸 的離解常數Ka是1.52x105計算(9)此緩衝溶液的PH 值(b)加10毫升(N盐酸於一公升緩衝溶液PH值的 甕化(假定可用濃度化替活度).
7. (2)從兩個氫電極聯下一濃差電池着手導出由(玻璃電極
+
H* (a) || 當量甘汞電極)组成之電池的H與E的關
(計算下列氧化還原作用在25°C時的平衡常數
Ag
Fe
Fe + Ag
+
假如於0.1.M的硝酸鐵溶液中加道量的幼細銀粉則到達平 衡時銀離子的濃度將是多少,已知標準氧化電極勢...
Fe** Fe***
Ag' Ag*
當量甘汞電極
-0.771 伏特
0.799 伏特
-0.2802 14
8.
單出Langmuir等温吸附么式,並說明此公式所根據的理論
假設在低壓及高壓時,此公式可如何簡化?說明兩種 情況下的物理意義
朝雖然裾恨老時十分之五,但是他精, 怒迢有趟會關口,現在你說說了,我也問
CITEIND
油也要用于
遊樂之地
坊衆,勿放無
在笼出荔牌所的門戶時,麥空术
能完怪別人呢! 一饋向男人身上推,牛不吃水盡也不能得,你能不能答應娀粉我?! | 牛頭低,自己艾不是十幾歲的小女孩,怎 「......」她聽了之後,沉吟了半晌 才絰緻滋說:「我市來早就向你說的,始 老時。縠並不像那些詩識的女人,一張將 的一生來報答你,他你媯生寒受光, 生,自己也要負一部份責任,不能完全怪 正式向你求婚,希望你能警選我,我將我
東還乾脆一點。」 續下去也不會有茜變耥点,可不如現在椌 過去的讓它過去算了我根本不愛你,讓」
欲知老時如何?明天再談,
发倘用大的嬌半,盤破了蝸牛亮的解鴻,照顧正式婚日 ,發,請教了許多醫生都沒有說很,有人徐正式將源,各行各寧,無可 用火在上燒,蝸牛壳内的汁液佩從口中 優因此爾浪漫,陳亦應向儀、 機盒玩物,見區風潮,離 叫骖 * 乔葜巴新花車。歹本人是了的真|「夜結實激藍橋路 • 將與 李有妙憂,爲余爭日 而無不及。娶以爲發,至有一張姿,余辦安與秋菊離婚手續 當爲做爭氣。一男子,都随 妙女曰:「好爲君爭氣,君亦 阁下來,把沙商在幾铿舂鋼銕上,再誆 起業梅花,比之爭後,唐湯之選。」關係曰:「只要瘋不學
心得嗎?气, 式說:「你攢了雄的淒釋後有甚樂發現祝
訪爾鹜特干半師」 謎案長說:「我現在準備偕同鍵式博士
。她的身设上並無絲活傷感和血,也並無任何 。一挺我看,死者是在極度恐排的情緒下而死的問題,」該式說。「現在?們去訪瘕鍪持至鼻師 .「你會注意過死者面部的表情嗎?」案式說 我嗎?」用來恭督察長常式簡
「遷就是要行現在多方偵查而求得答案的
傳婉薇的死亡之事而來的,我們青蠢地滋件案子, 池由你親自主理的,他說他希望和你會見談談 ̇ ∫ 罃持平箤舾現在在總部內,他說低无爲了
些汁液察到,泷患處
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