(1) Using the above informat
Lon, identify and name
the substanees A, B, C, D, E and F.
報日僑華
(b) 24 om of a mixture of methans
(CE) and sthane (CA) vera exploded with 90 on of oxygen. After cooling to room tempera- ture, the volume of gan swam nated. It was found to deofa- Me by 32 on when treated with ozuatio potash solution, ATL volumée were measured under the asme conditions,
育赦圈樂娛賃三第張五第日六初月二十年巳丁瑟夏
WAH KIU YAT PO
育教僑華
which is insoluble in dilute acide but soluble in aqueous ammonia solution.
1978
【中學會考試題預習專欄
明德社主
化
物
十五 朱宏林
Chemistry (15)
Question 22
19 g of hydrated calcium chlo ride were dissolved in water, This solution required 20 cm of sulphuric acid of unknown concen- tration to precipitate all the calcium ions. The precipitate formed was filtered, carefully -washed and dried and the filtrate was found to be neutralised com- pletely by 20 cm2 of 1M sodium hydroxide solution.
(a) Calculate the molarity of the
sulphuric acid used.
(b) Find the mumber of water of..
Find the number
crystallisation of hydrated
to calcium chloride.
) Determine the weight of pre-
cipitate thus obtainedj.
assuming that it is perfectly insoluble.
Question 25
(a) A la a colourless, soluble solid which gives a yellow flame in the flame test" On strong heating, it forms a colourless solid residue. C and evolves a colourless gas D which can rekindle a glow- ing splint. Its aqueous sol- ution give no visible change with silver nitrate solution. ⠀ B is a black solid, in- soluble in water. It can apeed up the thermal decompan sition of A. When B is heat- ed with concentrated hydroah loric acid, a greenish yellow gas E is evolved which can bleach a wet litmus paper white.
Solid C also gives a yell-
ow flame. When a mixture of
C, B and concentrated sulphu-
事
ric acid in heated, gas EAS
again obtained. An aqueous
solution of solid C reacts
with silver nitrate solution
to give white precipitate F
(li) Give the equations for
all the chemical reactions involved.
(b) Elementa X and Y have atomic
numbers of (2 + 1) and (2-1)
respectively, where Z is the atomic number of a noble gas. (i) In whiioh group of them
Periodic Table may X and
Y be placed respectively?.
(ii) Using the outermost shell only, draw electronic dia- grams to show how a mole- cule of element Y may be formed.
(iii) If Z has a value of 8,
give the names of X and Y respectively.
(iv) The elements mentioned in
(ii) can combine to form a compound W. What is its formula? Draw a diagram to show its structure:
Cestion 24
(a) The following flow-ohart shows.
the sequence of separating a.. mixture. consisting of silver chloride, lead(II)oxide, el- phur and calcium sulphate.
avapor
to dryness
solid A
add carbon diqulphide
(11) filter
Filtrate
(1) ada' dilute
nitric acid (1) filter
(1) add amionia
solution
(11) filter
residue
(1) add dilute..
nitric acid (ii) filter
rasidue
Kiltrate
(1) evaporate
to dryness (13) heat
strongly
solia
(1) Identify and name the su
substances áÁ‚3‚¤‚D and E.
(11) Give an equation for the
reaction converting D to
(1) Calculate the composition.
of the mixture by volume.
(11) Caloulate the volume of
unused oxygen, if any.
理 十五 榮家
PHYSICS(15)
Exercise 8 leat, Light
Sound and Wave Motion。
1. In an experiment to determ
mine the specific hent ca- nacity of nickel by the method of mixtures, the following readings were obtained:
mass of nickel sphere
0.125kg'
mass of copper calorimetar
-= 0.075 kg
mass
ws of water and calorimeter -0.175kg
initial temperature. the nickel sphere
110°C
initial temperature of water
and calorime ter
- 20°c
日四十月一年八七九一腊公年七十六國民鍵中
六期星 ealorimeter of ma as 0.0375
kg containing 0.05 kg of water at 20 ̊C. If the tempe erature of the water rises; to 96°c, find the temperature
of the bunsen hurner flame":
2. Three identical calonime-
tars contain. respectively) 0.1 kg of water, 0.2 kg of water and 1 kg of a liquid X. Heat is supplied to
these calorimeters at the
same rate by using three identical heaters for 1.5 minutes. The respective rises in temperatures are 15°C, 8°C and 14°C. (a) What is the heat capacity
of each calorimeter
(b) What is the specific chent capacity of xp (c) Find the power of the
henter.
(a.h.c. of waterm 4200Jkg
3. In an experiment to deter- mine: the focal length of
a convex lens, the follow- ing readings of object and inage distances were oh- tained :
(ii) Plot the graph of image.
distance
against object
distance.
(iii) Find the value of
(iv) Pint the focal length
af the
lens.
4. (a) In an experiment to
find the relation between velocity of sound in air the temperature, velocities
of sound in air at differ
ent temperatures are
measured":
velocity (v)
1
in na
Temperatura (T) in c
341 344 347 353
15 20 25 35
(A) Plot w against
(ii) Determine from the gra the velocity of sound at 0°C.
(iii) Write down a formula
melating the velocity of
sound in air and the
temperature T.
(b) Air in a pipe closed at.
one end and 0.45m long is
vibrating with two node s
and two antinodes, the temperature being: 30°C,
(i) Uning: the result of part
(a), find the wavelength the note produced by the closed pipe.
Final tempera
water
object dist
ance (in mm)
inage dist- ance (in m
Specific heat capacity
400.0
133.3
enpper = 400
350,0
140.0
water
Specific heat: capacity of
4200 J kg-lx-l
30000
150,0
250.0
366.7
250.0
300.0
350.0
400,0
(1): Find the values of P,Q,
(Note: "Neglect end correction,
(a) Calculate the specifie
heat. capacity of nickel。 (b) If the nickel is now ple-
ced in a bunsen flame and left until it has attaine the temperature of the
ned.
flame. It is then transfe
red rapidly to a copper
Rands.
tha
(ii) what is the frequency.
fundamental note pro- duced by air in the tube.
四名影,絲梅芝美「人佳代絕」
*命薄顏紅但·
再新昨從
资片午
歐來關港洽
淨
天親
體男北男
佈自
用于包 租廿步
俱演|名絕相自演
屬員不代
攝虛佳
流影傳人
風袖長:
行分於集
,忽然花的來色。人門聖
中最合年青最登對的一俱屬
並稱殊不感到尷尬 張國榮却拍床上戲 麗的有意捧爲純情偶象
她與镇永之車,地盤而不能
漢,豉天河:李松郴, 並大政治漩渦。 恬妞返台倾取十大明星獎。記者在晚事問起,主角是有名的 沈杏:陳群英,號平,肯烤他女主角成爲其孀,周旋於戴位名人。 「絕代佳人一由美麗的英ㄛ梅林主演
他出來機片約時,便找他拍片的人也不事書, 小生十八望的菜 初時吳思洪胍类片張染感受,至於動的因何事 被吳思篮稱五年麗,便與廣的簽了合約,嘗試做一部電影主角的
「他拍「紅撲春上春
一向十分民主。
雞的上一
的席姊服等工
胎恰號藥
一榮不關我到然死雲礙報
李菁恬 妞昨赴台
药
是紅影的片,後人類
式樂道味的里七鞅
约留學片瓦思
而且供他學到許多東西
今映午夜場
張玲,安漢,他槃,腿、陳長匯星鎘行執行董事中特產,左營然保鏧長信 青霞,林重儀,括任,。世九日行,附量是其中衛星的陳長,右俘尊像 李典·其文有狄真·林筒公任金票獸的「香港慈濃步行接力奕一,一月 中名列第一名是本港 慈善步行。兩位隊長藏
星選年,獲選名單日前:首姊姊云*(&) |辦的把台第一第十大明:,將會遇虿更多時間陪”而饰演男女主角質的 親、永开、四大樹佛主妙,所以要來探望任媚,拉伯的對象紅樓夢影片 由中影、邵氏、合其姊活类,將於日內分 ̇式的色彩,他經沒有人
席亲月娟术医蚩赴合主
·香港影刺自由慈有部 [六十四在台北的行 選出,頒獎铪定於今日, 是由台灣影迷投票方式
說的不
化了許多時間,對人物作配入的研究。
列水
牌的主名計事信的代所
麥,,分是部賞
!
不要雞
内田康明情
十萬石於原子弹下也表盖住,尤其他一面主猛射鏡候可
物生露了一些新的兑解。 英建,進行研究和在一部影片高性演出,你一定計畫使人地方。 了指不多一年時間,對美风現代一位签棺業未检定的雕牌 ·不過,格力奇利柏對麥帥的行誼也有許多不敢相同的
著有范 飾演麥克阿瑟演技卓越的
*兹洪亮了「麥克阿瑟將軍」之变,他會說:「雲你花 藝收日本,使用请于弹不是母必聽的。
金柏
求獲草
獎提越
他說:「麥克阿聚的曹诗自負,和好大喜功 - 懟是我
於梅人而.
格力哥利柏獲提名競選 荷
里活金球獎最佳男角
在力哥力柏認爲,歷史將會對高的的一予以公平
印業-否定多於定。但我拍邁部影片因而對他有了单
·呢?技力哥利柏認為港版的領導才能和當機立斯救使人佩的描轉 紐。他損失一下,說「由於我是韩演員道一行的,我教言:格力牙利柏因演麥帥一角将兵出的光現, 只在荷到活 澳的了解之後,我爾他的見解面相反了心的判斷,機封所有的体大人物一樣。因此他畫希望「妻交 養克阿瑟波普爾斯高的品質值得格力哥利核對他教仰,阿泰特集」一片能对突的的生平,始給于一些枝夜好
暴力克层
本色,外結者協省第三十五屆球獎提名大會中,獲導提名吋,
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