1971-05-28 — Page 20

興二首張五第日五初月五年亥辛曆系

WAH KIU YAT PO

1971 英文中學會考試題預習專欄

IN ACERBAT FUM SUNLIGHT

化學科

CHEMISTRY

LESSON TWENTY-SEVEN

ANSWERS TO FINAL TEST (Conventional)

PRESS

廿七

3. (*) (1) Water of crystallisation is defined as the definite:

amount of water which combines with some substances when they crystallise from an aqueous solution. As the water is chemically combined with the rest of the substance, the crystals of these "hydrated salts" appear, perfectly dry, but on gentle heating the wa. of crystallisation can be driven off as steam, and the substance will change to its anhydrous form.

The hardness of water is its soap-precipitating power- It is caused by the presence of soluble calcium and Magnesium salts in the water. These salts react with soap which is sodium stearate to form an insoluble acuum of calcium stearate;

The reaction is as follows: calcium salt + sodium stearate

cale, stearate

4 sodium salt-

No permanent lather will be formed until all the solu calcium salts ahve been removed from the gater by the above reaction,

報日僑華

英中會考數學科A(二)試題

五明星 日八廿月五年一七九一曆公三十六國民華中 眘致僑

Day SEVEN questions.. Start each question on a new page, Any necessary working must be shown. Marks will be deducted for poor presentation of marectaly. Candidates are expected to get sawa kasi

liable dearse of pcuracy.

(1):(5 marks)

The water stored in Plover Cove contains 0-004% of salt. In order to provide people of Hong Kong with water containing only 00005% of salt, how many gallons of ordinary in water should be nixed with every 1,000 gallons of a Player Coys You can assume that ordinary rain water contains no

(t)" (9 maki).

Large, medium and am sups were used to bring water to Hong Kong: 4 Yuge ships carry the same. amount of water at 7 amall ships: 3 mediums slips carry the same amount of water as 2 large ships and small ship 15, large, 7 medium and 14 small ships esch made 35 journeys and brought, pertain quantity of water to Hong Kong Lt how many journey's would 12 large, 14 mediumand 71 Amali ships. bring the same quantity 1

(a)(3) maska).

An unmarried man pays annual income tax to the Covemment at the following rates;

“Income

Do the first $7,000

On the next 55,000

On the next 15,000

On the next 35,000

On the next amount up to 55.000

Mr. Chao eams 52,100 per month.

Rate

no tax:

21%

81%

If he is unmarried, find the amount of tax paid by Mr. Chan In one year.

- (b) (9 marks),

Mr. Loe hai to pay 51 D4S tex at the end of the yea What fixed amount of money should he invest on the first day of each mouth of that year (as 29 per month compawid interest so that he can just nav

Elidée Tuch "Oves

(1) (7 marks)

Find all values of from

(b) : (7.mgke) ||

to 360 atisfying the equation

From point C of Victoria Peak, the angles of depression afi poter 4 to Hong Kong and a point 2 in Kowloon are 67′′ and 17o respectively. Points and lie on vertical plane with, A ing Basca level and 1,500 metres above sea level. Calculate the distance between A and B.

(5 marks)

The base of a right pyramid is a square of side 70 cm; each face makeran angle of 70 with the buse Plculate the height of the pyramid and the angle each laat edge makes with the baby,

(b) (5 márka):

Use the following graph to s

s song the tujuation

10) un xfx20;

The graph should not be handed in but no credit will be given for an answer "unless. The method of solution' is stated in the answer script.

10

3

(s) (5-muka).

Solve the equaniont;

Three Hydrated salts:

Washing soda, sodium carbonate decahydrate Na C0.101 Blue vitriol, copper sulphate pentahydrate Cu50 5120 Gypsum, calcium sulphate dihydrate.

The formula of anhydrous magnesium sulphate is MgSi and its molecular weight 24 + 32 + 64 – 120, One molecule of the anhydrous salt combines with x polecules of water, with 18x water. Therefore in 10051.22.

• 48.78 gm of anhydrous salt. The ratio of water to anhydrous Balt must be the same in one molecule as in 100 gms

18x

120

18:

12051.22 48.78

6146.4

-\\"((b) . : (9 'marks).

Two objects we moving uniformly with different speeds in a circular track whose length is 280 metras If they move in the same toteution, they will meet once every 56 minutes. If they move in opposite directions, they will meet once in every.8 minutes, bind the speeds of the uljèctv

(1) (7 marka)

and khe the roots of this

And man and

|(U), ((4 marks).

Construct an equation with integral coefficients so that the ronts of this equation are the reciprocal

the reciprocal of 3 and the reciprosal of the value of A as foudlyn (1).

(i) (3 masks)

Campars the coefficients of the equations you have obtained in (1) and (U), and hence suggest 'en. equation, whose roots we she reciprocals of the roots of

markaj

Fig. 4 shows the travel grapha 4PQ and BRS- sanétosd ARL

(0) When do the meat?

PT

nien, and respectively who travel on the

(b) Find the average speed of X- from 10.20 to 11.00.

(i) How far does X go white is testing?.

When are they 2 km apart?

(v) What average speed must travel in the last part of his journey, that is from 11:50 to 32.30;

The can arrive at by 12.30?

The graph should not be handed in..

State the law of multiple proportions and describe. how the truth of this law could be illustrated in the Jaboratory, in a particular case,

The law of multiple proportions, states that, when two elements combine to form more than one compound, the weights of one element that combine with a fixed wei of the other bear simple whole number ratios to one another.

Copper and oxygen form two compounds, the black cupric oxide and the red cuprous oxide, Samples of these two oxides can be used to illustrate the law.

5.60 gm of a metal combine with chlorine to form 16,25 gm of a chloride which, on reduction, gave 12.70 gm of another chloride of the metal, Show that these results illustrate the above kaw,

(14 marks)

"A vessel la 'made in the form of a right priam, the base of which is a trapezium as shown in fig. 1. His partly filed with water to a depth of 20 cm. A solid metui cone, whose. bise, in a circle of radius 10 cm and whose height is 15 cm, i put into the water. Find the rise in "the level of the Weser cariect to the newest man.

(a) (7) macki)

(1) two distinct triangles

(U) only one triangle

(k) tilang

can be drawn to hit the data?

(7 marks)

would be the range of values of bi

Distance from.

G

12.70, go

"A'B

In the convex quadrilateral ABCD. in 19.1

2 BC DC HA DA *_3. and

Calculations:

weight of chloride weight of metal

first chloride 10.25 g

AC = 6. Calculate the angle BAD.-

second chloridi

5.60 ge

weight of chlorine

5.60gm

7.10 gm

10.65 gm The weights of chlorine that combine with a fixed weight -i.e. 5.6 gm of the metal are in the ratio 10.63 1.7.10

or 32. The last is a simple whole number ratio which agrees with the law, and with two chlorides of the type MC1 and MCI

5. (a) (1) Gay Lussac's Lau:

The volumes of gases taking part in a chemical change either as reactants or as products bear a simple numerical ratio to

to one another if the volumes are measured at the same temperature and pressure.

(11) Avogadro's hypothesis (Law):

Equal volumes of all gases, if measured at the same temperature and pressure, contain the same number of

olecules,

CICO

+ 2HC1

Since the molecular weight of calcium carbonate is 40 + 12 + 48 100 and one gram-molecule of carbon dioxide occupies 22.4 litres at N.T.F., the above “ equation tells us that 100 g of calcium carbonate. yield 22.4 litres, and 10.00 g therefore 22.4/10

2,24 litres of carbon dioxide measured at N.T.P. According to the gas laws 2.24 litres at N.T.P. ares 2,21 × 760 x 293 litres at 20°C and 750 ma pressure,

750 x 273 1,8. 2.44 litres.

Under the given conditions 2.44 litres of carbon diokide are obtained from 10,00 gm of calcium carbonā

If carbon dioxide is passed through red hot carb redox reaction takes place,

+C 260. (Carbon Monoxide) 2

The equation tells us that 1. molecule of ca con dioxide yields 2 molecules of carbon monoxide, According to Avogadro's principle 1 volume of carbon dioxide there fore yields 2 volumes of carbon monoxide measured at the same temperature and pressure. In other words, the -volume in doubledi.

„88 litres of carbon monoxide will be obtained,

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