Chemistry Definition Form 5 *Please do not cancel or change the name and watermark. Credits: Yvonne Choo http://dashortsquare.blogspot.com/
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Το Φύλλο 5 από το Σύλλογο Απανταχού Καρυωτών "Το Αρτεμίσιο" στο Καρυά Άργους Αργολίδας - Ορεινοι Προορισμοι Αργολίδας http://www.karyaargous.gr/
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ANSWERS JAWAPAN (f) S2O32– (aq) + 2H + (aq) → S (s) + SO2 (g) + H 2O ()
TOPICAL TEST 1 UJIAN TOPIKAL 1
S 2O32– (ak) + 2H +(ak) → S (p) + SO 2 (g) + H 2O (ce)
PAPER 1 KERTAS 1
1 6 11 16 21 26 31
B B C C D B B
3
2 7 12 17 22 27 32
D D C C B A B
with other reactants particles and increases the frequency of effective collision.
3 8 13 18 23 28
D D A B D A
4 9 14 19 24 29
D C D C D C
5 10 15 20 25 30
A A B C A C
Ini kerana bentuk serbuk magnesium mempunyai luas permukaan yang lebih besar daripada bentuk pita. Ini akan menambahkan jumlah luas permukaan yang terdedah kepada perlanggaran dengan zarah bahan, dan seterusnya menambahkan frekuensi perlanggaran berkesan. berkesan.
(a) Hydrogen gas Gas hidrogen
Delivery tube Tiub penghantaran
(c) The gas will produce a ‘pop’ sound.
Burette Buret
Retort stand Kaki retort
Clonical flask
Water
Kelalang kon
Air
Gas itu akan menghasilkan satu bunyi ‘pop’.
(d) Copper(II) sulphate Kuprum(II) sulfat
(e) Carbonates Hydrochloric acid Granulated zinc
PAPER 2
Asid hidroklorik hidroklorik
KERTAS 2
Ketulan zink
Karbonat
Basin Besen
5 (a) (i) Set I – The wooden splinter g lows dimly and slowly. Set I
(b) Experiment 1: P 1: P
1 (a)
Eksperimen 1: P
Total volume of oxygen/ cm3
– Kayu uji membara dengan gelap dan perlahan.
(c) Number of moles of HCl
Jumlah isi padu oksigen / cm3
Bilangan mol HCl
250
– No effervescence occurs.
= 50 × 0.10 = 0.05 mol 1000
240 200 150
Tiada buih terbentuk.
Set II – The wooden splinter rekindles Set II brightly and rapidly.
Experiment 2: Q
– Kayu uji berbara berbara menyala dengan terang dan cepat berlaku.
Eksperimen 2: Q
100
Number of moles of HCl
50 Time / s 0
20
40
60
80
100
120
Masa / s
175 cm3 = 3.5 cm3 s –1 50 s (240 – 175) (ii) = 1.625 cm3 s –1 (90 – 50) (225 – 100) (iii) = 2.717 cm3 s –1 (66 – 20) (c) 2NaOCl (aq) → 2NaCl (aq) + O 2 (g)
(b) (i)
– Effervescence occurs.
Bilangan mol HCl
= 25 0.15 = 0.04 mol 1000 (d) (i) Total volum volumee of H2 evolved = 45 cm3 Jumlah isi padu H 2 terbebas = 45 cm 3
= 45 = 11.25 cm3 s –1 4 (ii) Number of moles of H2 evolved
Untuk merendahkan tenaga pengaktifan, meningkatkan kadar tindak balas.
2 (a) Temperature
45 = 0.0019 mol 24 × 1000 Average rate of reaction =
Eye Mata
of
the
– Use catalyst. Menggunakan mangkin. mangkin.
Larutan natrium tiosulfat+ asid sulfurik
4 (a) (i) Mg (s) + H2SO4 (aq) → MgSO4 (aq) + H 2 (g) Mg (p) + H 2SO4 (ak) → MgSO4 (ak) + H 2 (g)
Mark ‘ X X ’ Tanda ‘X’
(ii) Experiment B Experiment B Eksperimen B
(c) 0.018; 0.026; 0.042; 0.067 (d) Temperature / ºC
= 60 = 1.71 cm3 s –1 35
Suhu / ºC
Experiment C
60
Eksperimen C 50
= 60 = 2.40 cm3 s –1 25 (iii) This is because sulphuric acid is a diprotic acid and produces more hydrogen ions than hydrochloric acid.
40
30
20
10 1 -1 time / s
0.06
0.07
1 -1 masa / s
(e) The rate of a reaction increases as the temperature of a reactant increases. Kadar suatu tindak balas meningkat dengan penambahan suhu bagi suatu bahan tindak balas.
Ini kerana asid sulfurik ialah satu asid diprotik dan dan menghasilkan ion hidrogen yang lebih banyak daripada asid hidroklorik.
(b) This is because the magnesium in powder form has a larger surface area than the ribbon form. This increases the total surface area exposed for the collisions 1
Basin Besen
Water
Serbuk manganat(IV) oksida
Air
filled
with water until
– The burette is inverted into a basin of water and clamped to a retort stand.
Purata kadar tindak tindak balas
Menambahkan suhu campuran. campuran. Sodium thiosulphate solution + sulphuric acid
Burette Buret
Satu buret diisi dengan air sehingga penuh.
=
(b)
Retort clamp
Manganese(IV) oxide powder
– A burette is it is full.
Bilangan mol H 2 yang terbebas
0.0019 = 0.0005 mol s –1 4 (e) – Increase the temperature mixture.
Suhu
0 .05
Gas O2
Larutan hidrogen peroksida
Purata kadar tindak tindak balas
(e) To lower the activation energy, increase the rate of reaction.
0.04
O2 gas
Hydrogen peroxide solution
Average rate of reaction
120 saat
0.03
(b) (i)
Pengepit retort
Masa diambil = 4 s
2NaOCl (ak) → 2NaCl (ak) + O 2 (g)
0.02
Tidak
Time taken = 4 s
(d) 120 seconds
0.01
Buih terbentuk.
(ii) No
Buret itu diterbalikkan ke dalam satu besen dan dikepitkan dengan kaki retort.
– Water level is adjusted and initial reading is recorded. Aras air dibetulkan dan bacaan awal dicatatkan.
– 50 cm3 of ‘2 - volume’ hydrogen peroxide is poured into a conical flask. 50 cm3 ‘2 - isi padu’ hidroge n peroksida dituangkan ke dalam kelalang kon.
– 0.2 g of maganese(IV) oxide powder is added. 0.2 g serbuk manganat(IV) oksida ditambahkan.
– The mixture is shaken. Campuran itu digoncangkan.
– Stop-watch is started. Jam randik dimulakan.
– Volume of gas collected is recorded at regular intervals. Isi padu gas yang dikumpulkan dicatatkan pada tempoh yang tetap.
– The experiment is repeated by using different amount of MnO2 powder. Eksperimen itu diulangi dengan menggunakan jumlah serbuk MnO 2 yang berlainan.
