F5 Science Chapter 06 - Electrochemistry

Which of the following shows the correct conversion of energy in electrolysis process?

Antara yang berikut, manakah menunjukkan perubahan tenaga yang betul dalam proses elektrolisis?

• Chemical energy → Electrical energy

  Tenaga kimia → Tenaga elektrik

• Electrical energy → Chemical energy

  Tenaga elektrik → Tenaga kimia

What is produced when an electrolyte dissolves in water?

Apakah yang terhasil apabila elektrolit terlarut ke dalam air?

• Electron

  Elektron

• Atom

  Atom

• Ion

  Ion

• Molecules

  Molekul

State which one is cathode?

Yang manakah merupakan katod?

• A

• B

• C

• D

Which of the following is not an electrolyte？

Antara yang berikut, manakah bukan elektrolit?

（答案有2个）

• Copper (II) sulphate solution

  Larutan kuprum (II) sulfat

• Molten aluminium oxide

  Leburan aluminium oksida

• Sucrose solution

  Larutan sukrose

• Lead (II) bromide powder

  Serbuk plumbum (II) bromida

• Sodium hydroxide solution

  Larutan natrium hidroksida

What are the ions present in electrolysis of copper (II) sulphate solution?

Apakah ion-ion yang hadir dalam elektrolisis larutan kuprum (II) sulphate?

• Copper (II) ion, sulphate ion

  Ion kuprum (II), ion sulfat

• Copper (II) ion, sulphate ion, hydrogen ion, hydroxide ion

  Ion kuprum (II), ion sulfat, ion hidrogen, ion hidroksida

• Hydrogen ion, hydroxide ion

  Ion hidrogen, ion hidroksida

• Copper (II) sulphate ion

  Ion kuprum (II) sulfat

Which of the following factors does not affect the product of electrolysis?

Faktor-faktor manakah yang tidak mempengaruhi hasil elektrolisis?

• Position of ion in electrochemical series

  Kedudukan ion dalam siri elektrokimia

• Concentration of halide ion in electrolyte

  Kepekatan ion halida dalam elektrolit

• Mass of electrolyte

  Jisim elektrolit

• Type of electrode

  Jenis elektrod

Which cation (+) will be selected for discharged according to electrochemical series?

Kation (+) manakah akan dipilih untuk dinyahcas berdasarkan siri elektrokimia?

• Potassium ion, K⁺

  Ion kalium, K⁺

• Hydrogen ion, H⁺

  Ion hidrogen, H⁺

• Copper (II) ion, Cu²⁺

  Ion kuprum (II), Cu²⁺

• Aluminium ion, Al³⁺

  Ion aluminium, Al³⁺

Answer explanation

这张表叫做Electrochemical series/Siri elektrokimia, 越下面的Ion越容易被选择来 Discharge/Dinyahcas

Diagram shows the electrolysis of molten lead (II) bromide. What can be observed at the cathode (-) and anode (+)?

Rajah menunjukkan elektrolisis leburan plumbum (II) bormida. Apakah yang dapat diperhati pada katod (-) dan anod (+)?

• Anode: Silver solid deposited

  Cathode: Brown gas released

  Anod: Pepejal kelabu terenap

  Katod: Gas perang dibebaskan

• Anode: Brown gas released

  Cathode: Silver solid deposited

  Anod: Gas perang dibebaskan

  Katod: Pepejal kelabu terenap

• Anode: Gas bubbles produced

  Cathode: Gas bubbles produced

  Anod: Gelembung gas terhasil

  Katod: Gelembung gas terhasil

• No changes

  Tiada perubahan

Answer explanation

Molten/Leburan 的 Lead(II)bromide/ Plumbum(II)bromida

里面的Ion包括

Cation/Kation(+): Lead (II) ion / Ion plumbum (II)

Anion(-): Bromide ion/ ion bromida

正离子会被吸引到Cathode/Katod；而负离子会被吸引到Anode/Anod。

Anode 上 bromide ion/ion bromida 会被Discharge/dinyahcas 形成 bromide gas/ gas bromin （褐色q气体）

Cathode 上 lead(II) ion/ ion plumbum (II) 会被Discharge/dinyahcas 形成 Lead/plumbum （银色金属）

What will be produced at the anode and cathode?

Apakah yang akan terhasil di anod dan katod?

• Anode: Hydrogen gas

  Cathode: Copper

  Anod: Gas hidrogen

  Katod: Kuprum

• Anode: Oxygen gas

  Cathode: Hydrogen gas

  Anod: Gas oksigen

  Katod: Gas hidrogen

• Anode: Oxygen gas

  Cathode: Copper

  Anode: Gas oksigen

  Katod: Kuprum

• Anode: Sulfur

  Cathode: Copper

  Anod: Sulfur

  Katod: Kuprum

What is the method to test the gas collected in anode?

Apakah kaedah untuk menguji gas yang terkumpul di anod?