五期星
anhydrous
興二路版八第 日十初月十年年戉惠
WAH KIU YAT PO
郭日倫華
(4)
1979
Liquid X iu nuidified | potnasium dichromatej
中學會考試題預習專欄
(11) Liquid X is bromine
solution in wateri
90%
catalyst
(114)Liquid X in neutral
barlum chloride solution:
化明
Chemistry (5)
Question 7
In the experiment as shown *below, the gas 2 evolved on heating a mixture of copper turnings and concentrated. sul phuric acid is passes into a liquid X In the test tube B.
copper. turnings
(a) Give the chemical name of
5(b) Write an equation for the
formation of gas 3.
*(0) If the liquid X is the
distilled water, state the
ions that will be present
in the resulting solution,
~(d) Would the resulting salute
孟勋看白金精彩d in (e) hav
All greater or smaller than
(e) Describe what would observe
whan the following liquide are placed, in turn, in the
teat tuba
(iv) Liquid X is saturated. hydrogen sulphide anlutton,
Give the equations for the reactions (ii), (111) and (iv).
(f) What
to passed over heated lend(IV)oxide? -
∙Give an equation for the
reaction, if any.
(R) A white solid is obtained |
*n the reüidue in the tube A at the end of the exper-
(1) What is the white
aolid?
(11) The residue in then
poured into a beaker half-full of water with stirring. What would be s
then?
(h) Would there be
produced 17 copper is substituted, in turn, by
wine?
If there is a reaction,
reaction,
If there is no reaction, explain briefly.
Question:
The apparatus as shown in the following diagram is used to prepare sulphur trioxide in the laboratory,
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政暴
CONA
HWS0A
1
heat
receive
ice and:
water
sulphur trioxida
(a) Give the equation for the
formation of sulphur trinxide,
(1) Suggest a catalyst suitable for the above reaction, (0) Why are the gaseous react.
́anta passed through optom entrated sulphuric acid?
(d) What doen solid sulphur
look like?
(e) Why is a drying bulb with
anhydous calcium chloride attached to the receiver? (1) It is found that the
alyst needs to be heated. initially and once the reaction has started, no more heating is required. What does this tell you about the nature of the reaction?
does the catalyst 'need to be heated at all?
(h) What would be the volume
of sulphur dioxide, me ured at wit, pa, chauned In proparing 1,6 g of aulphur trioxide?
usually
(1) Sulphurie auld in
日十月一十年八七九一层公車七十六三路費中 目標育教
|(b) When anhydrous iron(II)au]-
phate fa heated strongly,
obtained by dissolving
sulphur trioxide in cone- entrated sulphuric acid
first, but netidirectly in
water, Why is this step
(3) Using balanced equation(s)
only, show the reaction(s): that would take place in wach of the following experimentsi-
(1) A mixture of andium chloride, manganese (IV)oxide and concent trated sulphuricaseid is heated.
(11) A mixture of potassium-
nitratu, and concentra» ted sulphurie sold is heated with sopper turningsầ
(a) 8.74 g of a mixture of
Cammonium sulphate and pota
assium sulphate are weighed out into a flank and 30 cm2 of 0.9M potassium hydroxide solution are added. The solution is boiled to
expel all the ammonia gus and the excess potassium hydroxide requires 12.5 om of sulphuric acid donatine ing 19,6 g of sulphurie. noid per cubic decimetre. (Abste
1-1,8-32,0-16,N=14) |
(1) Write the equations
for the reactions
(11) Caloulete the compos- Ition of the original
the reaction represented
hy the following equation will take place.
PepDy + 80g + 50g.
(1) The gaseous products
are then dissolved in some distilled water. give the name(s) for any fons, that would be formed in the sol- ution,
wation(e) for the formation. (11) Barium chloride solutes
ion is then added to the solution obtained in (11), white preci- pitate is observed
Nade the dompounds present in the preci pitate and give. ionin @qautions for their formatipila
(111)What happens if an
联
天幫離告-斯沙·
;四十包分,秀传
rochloric acid is. added to the precipitate abulis mixture is heated gently?
)11 3.04 g of anhydrous
iron(11)sulphate is. completely decomposed, calculate
(i) the volume of the
gaseous products that would be gb- tained at stip,;
(ii) zhe wasa of iron
(111)oxide that
would be obtained. .wt, Fe-56,8=32,
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