頁二第張六第 每日三十月四年午丙感哀
WAH KIU YAT PO
英中會考化學科試題
erouns of
Group
Group I
Group Ex
CHEMISTRY-
Candidate STS
Which
sains marais a of whicni
May be found free in nature
React with cold water ›
Fot
Exhibit variable valencies?
個
Form sparingly soluble sulphates 7.
10
rinis'allowed - Two hours and thirty minutaa
SECTION A (80 marks)
Answar ALL ma questions in the spaces provided x Chemica¡¡symbola are permitted
only in equations./
Atomic welant#ISMO #241
%-82.. 07-116.
นา
三期星
Answers
One of the elements nas atomic weight of 20 and an atomic numner of iv.
means of a labelled diagram, show the atomic structure of this element
Diagram
Some of the gases studied during the chemistry course areń(8) oxygen.
(b) hydrogen, (f) chlorine, (d)'ammonis, (a) hydrogen sulphide - (f) hydrogen chlorida. {x} nitrozon,, thì nitrogen dioxide, a (1) sulphur dioxide.
"select mom-Chan last!
rwớ gases that are denser than ̃air.
(ii) --- Two gangs that are less denss than ate,
(Iil) A gas that is an acid anhydrida.
(iv) -Two gases that burn-in six.
Anaworl
Underins, the term that best completes the statement or answara she question.
11
jay Menum,, (b) diamond, «ini watar zong"(8) absoluta kieskoj, saj plessified no a compound.
Athletis funnel is a standard equipment in the laboratory preparation of
1) ammonia, (b) plastic sulphur,, lot carbon dioxide, (d) nitric acid,
It is possidia to prepare a concentrated asïulion of (a) Barium, sựtrate (b) silver chloride, (c) Jezd sulphate,, (d) calcium hydroxide.
Gv] The number of electrons present in the innermost shell of any element
other than hydrozen is (a) 1, (b) 2, (c)4. (d) 8.
Please men over
Dora chlorine react with thun etement
Give one reason to AuŊDOTI VON? KOSWEE
Faica CACE Examan sincopa as in comma 2.
Coluran. X
(a) Green plants.
(b) Lavoisier,
(c) Nitric oxide.
(d): Cutting, metalem.
(el. Sodfur
(f)-Iodina:
column g
Sublicatio
Violet vajmarq
A very powerius recuting agent,
Removal of carbon dioxide from the
Turn beow when exposed to air. Combustion theory
Oxyacetylene, flame.
Lumierer of nitrogen reacts with 500 e, e. of hydrogen to form
conditions.]
de, cajoljammonia- LAI volumes are measured, and
the
ti)
For every 4 C. c, of hydrogen obtained by the electrolysis of water Acidified with sulphuric acid Wes
cic of onygen will ba obtained. All volumes are measured under the same conditions. I
If two containers of different gases under the same conditione have the same number of molecules, the gases must have (a) an equal number of atoms, (b) equal molecular weights. (c) poual volumes, (d) equal vapour densities
(yilar Three substances produced by the electrolysis of brine are chlorine,
hydrogen and (a) sodium carbonate. (b) sodium hydroxide, tc) potassium. hydroxide, (d) calcium chloride.
rife the term that, when inserted in the blank, will make the #tatemeni true
according to the Laye
the same compound will always give the same resuḥia.
Manganese dioxide used in the laboratory préparation o)
BMS acte as an oxidising agent.
Rim Calculate the percentage of water or crystallization, psom salt.
[ MeSO. 7H2O
Calculation
Answer:
in the space provided, draw the shapes of the solubility curvas chloride and 2. eas which does not react with water.
analysis of
Diagram
DODA WELDF does not taste to sour as temon juice because the Foncentration of
The element',
long in soda water is low
Je used in vulcanting tunge:
Solubility
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Woman in prepared, py, the
It is believed that if an electric current can be conqucten through solution, there are
Dresent in the solution.
A DORIESCUna armoning neated in a unsen flame will impact 37än colour to the flame,
A HOMESNEstos reactione, wález, ka Formen trom the reaction between
and:
when manganese aloxida is added to mosten patasetura.chlorate, the rate: et which oxygen to evolved
Give the formula for a chemical substance a spignon of which will
111
Forma precipitate with tead nitrate solistion but not with conner, streate iolution.
Answer
Still règn a precipitate with sulphuric acid solution but not with mat
acid.
Answar
Tilim DISSOLVG both aluminium hydroxide and zinc hydroxido
Temperature --ə onent Samsulubütty curve for a 2A9
chemical activities. atarting with
Temperatore
solubility curve
Arrange me following metals, in order the most activo first."
gnesium
potassium, Copper lead.
rome one on the mistaisin, each case wÙICAZ
Does not dispiace, hydrogen from aliute acids
deacts wito very dilute matric dcią to zive avarozen.
Answer
Anawar
Complete the following statements;
The carnphates of most metais té. g.
And a gas an heatingë
tarbonates) are decamborod inta
The gas 15
carbonate Leaves no restave ocúrna on heating,
Name one Important substance provided by each of the folmvine procesas.
in each case name the catalvat usei
Hydrogenation,
Haber procesa.
(iin Contact process.
Answorst
(I) Substance;
Godation
Give, in the form of a baja
equation; nas examute to istrase each or
the following.
៥
Double avecMPOSICION
1 Substance:
1
Substance
catalysti
catalvai
For each incorrect statement, write the term that must be substituted for the underlined term to make the statement correct. For each.corract staṭarviant write the word "TRUE!!!
Methang la a covalent compound., -
According to the Dalton theory, the smallest particls of matter is neutron, Solld sodium chloride is a good conductor of electricity...
The most active halogen," fluorine, cains electrons mori cenalty
iReversible rcásnom
Thermal dissocząñaBE
SECTION B 1120 market,
Instructions to candidates,
Answẹp Four questions only. Each carfles 30 marks. equations and structural formulae where appropriate. tombound as represented by Bach structural formula,
Give chemicas
Name the orgame
Fal Name two principa! ores ossITO)
.[114)
(iv)
Select thaizonte, pente ve
PINTUS' OWOcaridi for caun on v
procédures done in the laboratore.
kú separate « mixture or liquids," oothing ai atiterent compera
To show that gases are very soluble in water.
lul le prepare nitric acid...
(iv). To prepare a gas by heating a solid os a mixture or suno audelanges.
To determine a definite weight of water neoduded during a chemical Chanute
U
(b)
瞳
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By means of a'ssrien of equations (practical details and diagram:NÓT
required) show hows,
(1) Ethyl alcohol te ponverted into acetic acid (a) Methyl acetavoir obtained.from methyl alcohox.
State the conditions under which the reactions take place.
You are, provided with potassium nitrate, ammonium chloride,”slaked- lime and concentrated sulphuric acid, but no other reagente, Suggest how you would obtain fil nitric acid, lit) ammonia. (iii) oxygen." (Diagr Bro NOT required}
State briefly the industrial preparation of nitric acid, starting tremi ammonia,
"Describe what happens when (1) ammonia gas reacts with chlorine gas. (ii) ammosia solution is added to ferric chloride solution.
For each of the tajlowing alaternenta orietty describe an experiment yun. would perform to find out if it is true
When nyarogon is burnt in air, water is formed. "Diagram is required)
(B)
Describe, whờn the aid of a large, labelled,diagram the manufactura or pigrom from sran gré. Wette balanced equations for the important reactions that take place in the blast furnace.
(17
Sulphur dioxide shows both reducing and oxidising
Diagram is NOT requiredi'
roperties!
What to the infuence of the presence of #2) carbon, (11) manganèse. ibm'ausdienu at kisan 1
State what you would see and explain what happens when
Concentrated nitric acid in added a little, at a time to copper hirping in a beaker until no further change takes place
piece of burning magnesium 15 lowered into a jar of carbon dioxide
4 stream si chlorine is passed into a solution of ferrous chloride-
Describe and good chemical test in kach "cals for distinguishing berwira the following pairs of substancesi
@volum carbonate and sodium bicarbonate;
[il}y Copper oxide and manganese dioxide, [Lili Chalk and slaked-lime...
Describe the laboratory method for the préparation of reasonably pure. ethylene from ethyl alcohol. How does ethylene react with (i) hydrogen. lil bromine water7,
(1)
(311
X la a pale green, crystalline solid which dissolves in water give a pale green soluțion
A solution of X in water gives a white precipitate with barium chloride solution. The precipitate is insoluble tn dilute hydrochloric acid solution,
(1) A solution et A' in water gives a dirty creen precipitate with
wodtum hydroxide olution :
Livi
When A só cautiously heatede water vaptur. is given out first. On further henting. a brown solid residue is left behind ::
Suggest an appropriate name for the solid A and write ite enèmical i formula. Write chemical equartons for the reactions which take place in (ii) and (iv). Give the name of the white precipitate formed in (11), the dirty green precipitate formed in fifth and the brown residue. formed in (iv).
2. 45-gm, H2SO, ls contained in 500 c. c. solution. -0.3 cie, of the sulphuric acid solution required 30 E. e of sndium bicarbonate solution for neutralization. Calculate the strength of the sodium bicarbonais solution in grams per Iltre:
What is
is the volume or caroon aloxide evolved at M. I. P. when 5 gms." calcium carbonate is added to 60,¢ ́°c) N-hydrochloric acid solution? What weight of calcium carbonate would remali?
(Atomic weienta: 1. DEJE, QU15, Na - 23, C.-12, G1 = 35)