Electrolysis
Muhtasari
Strip away the wrapper of an aluminium can or look at the shine on a chrome-plated tap, and you are seeing the results of electrolysis. This process uses electricity to break down ionic compounds into their elements, powering industries from metal refining to water purification.
In this lesson you will discover why ionic substances only conduct when molten or dissolved, trace the movement of anions and cations to their electrodes, write half-equations for the reactions that happen there, and predict the products of several key electrolysis experiments that appear regularly on the Edexcel papers.
Malengo
- understand why covalent compounds do not conduct electricity
- understand why ionic compounds conduct electricity only when molten or in aqueous solution
- know that anion and cation are terms used to refer to negative and positive ions respectively
- describe experiments to investigate electrolysis, using inert electrodes, of molten compounds (including lead(II) bromide) and aqueous solutions (including sodium chloride, dilute sulfuric acid and copper(II) sulfate) and to predict the products
- write ionic half-equations representing the reactions at the electrodes during electrolysis and understand why these reactions are classified as oxidation or reduction
- practical: investigate the electrolysis of aqueous solutions
Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Electrolysis. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- Which of the following substances can conduct electricity? A) Solid sodium chloride B) Molten sodium chloride C) Solid sugar D) Liquid wax Answer: B
- During electrolysis, positive ions migrate toward the: A) Anode B) Cathode C) Electrolyte D) Power supply Answer: B
- What is produced at the cathode during the electrolysis of aqueous copper(II) sulfate? A) Oxygen B) Hydrogen C) Copper D) Sulfur Answer: C
- In the electrolysis of dilute sulfuric acid, what gas is produced at the anode? A) Hydrogen B) Oxygen C) Chlorine D) Sulfur dioxide Answer: B
- At which electrode does oxidation occur during electrolysis? A) Cathode B) Anode C) Both electrodes D) Neither electrode Answer: B
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Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Electrolysis? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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