

kadar Tindakbalas bab 4 f5
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Science
•
5th Grade
•
Hard
SITI Moe
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1
kadar Tindakbalas bab 4 f5
by SITI Moe
2
Kadar Tindakbalas
Kadar tindak balas ialah perubahan kuantiti bahan tindak balas atau hasil tindak balas per unit masa.
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Multiple Choice
Apakah unit bagi kadar tindak balas?
What is the unit for rate of reaction
kg
ms-2
J mol-1
cm3 s-
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Menentukan kadar tindak balas
Antara perubahan kuantiti bahan atau hasil tindak balas yang boleh diperhati atau diukur dalam tempoh masa yang tertentu untuk menentukan kadar tindak balas termasuklah ;
■pengurangan jisim, isi padu atau kepekatan bahan tindak balas
■ pertambahan jisim, isi padu atau kepekatan hasil tindak balas
■ pengurangan atau pertambahan tekanan, suhu, nilai pH, kekonduksian elektrik, kekonduksian haba atau keamatan warna campuran tindak balas
■ pertambahan isi padu atau tekanan gas yang terbebas
■ pertambahan ketinggian mendakan yang terbentuk
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KADAR TINDAK BALAS PURATA
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Multiple Choice
Apabila magnesium bertindak balas dengan asid hidroklorik, gas hydrogen
dibebaskan. 45 cm3 gas hidrogen dibebaskan dalam masa seminit. Berapakah kadar
tindak balas purata?
When magnesium reacts with hydrochloric acid, hydrogen gas is released. 45 cm3 of
hydrogen gas is released within a minute. What is the average rate of reaction?
0.45 cm3 s-1
0.75 cm3 s-1
0.50 cm3 s-1
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Multiple Choice
Rajah 1 menunjukkan graf isi padu gas melawan masa.Titik manakah menunjukkan kadar tindak balas yang paling tinggi.
S
T
V
U
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Multiple Choice
Maklumat berikut menunjukkan suatu persamaan tindak balas.
Antara kaedah berikut, yang manakah paling sesuai untuk menentukan kadar tindak
balas di makmal sekolah?
Which of the following methods is the most appropriate for determining the rate of
reaction in the school laboratory?
Menentukan perubahan suhu larutan dengan masa
Determine the change in the temperature of solution with time
Menentukan perubahan kepekatan larutan zink klorida dengan masa
Determine the change in the concentration of zinc chloride solution with time
Menentukan isi padu gas hydrogen yang dibebaskan dengan masa
Determine the volume of hydrogen gas released over time
Menentukan perubahan kepekatan asid hidroklorik dengan masa
Determine the change in the concentration of hydrochloric acid with time
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Multiple Choice
Mengapakah pertambahan kepekatan larutan natrium tiosulfat akan meningkatkan
kadar pembentukan mendakan kuning?
Why does an increase in the concentration of sodium thiosulfate solution increases
the rate of formation of yellow precipitate?
A Pertambahan tenaga kinetic
Increase in kinetic energy
B Mengubah kadar sesuatu tindak balas kimia
Changes the rate of chemical reaction
C Pertambahan bilangan zarah bahan tindak balas
Increase in the number of particles of reactants
D Jumlah luas permukaan (JLP) yang terdedah yang lebih besar kepada tindak
balas
Larger total exposed surface area (TSA) to reaction
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