Electrolysis Continued
Gbogbo ọrọ náà
Electrolysing a molten salt is one thing, but most real electrolysis is done in water solutions, where there is an extra player: the water itself. This makes the products less obvious, because hydrogen and oxygen can appear alongside, or instead of, the ions you started with.
In this lesson you will build on the basics to predict the products of electrolysing aqueous solutions, learn the rules that decide what forms at each electrode, and see how electrolysis is used in electroplating to coat objects with metal.
Ebumnobi
- Identify the products formed at the electrodes and describe the observations made during the electrolysis of: (a) molten lead(II) bromide (b) concentrated aqueous sodium chloride (c) dilute sulfuric acid using inert electrodes made of platinum or carbon / graphite.
- State that metals or hydrogen are formed at the cathode and that non-metals (other than hydrogen) are formed at the anode.
- Predict the identity of the products at each electrode for the electrolysis of a binary compound in the molten state.
- State that metal objects are electroplated to improve their appearance and resistance to corrosion.
- Describe how metals are electroplated.
- [Supplement] Identify the products formed at the electrodes and describe the observations made during the electrolysis of aqueous copper(II) sulfate using inert carbon / graphite electrodes and when using copper electrodes.
- [Supplement] Predict the identity of the products at each electrode for the electrolysis of a halide compound in dilute or concentrated aqueous solution.
- [Supplement] Construct ionic half-equations for reactions at the anode (to show oxidation) and at the cathode (to show reduction).
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Electrolysis Continued. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Why can electrolysing a solution give different products from the molten compound? A. The current is higher B. Water provides extra hydrogen and hydroxide ions C. The temperature is lower D. The electrodes react Answer: B
- At the cathode, if the metal is very reactive (such as sodium), the product is: A. The metal B. Hydrogen C. Oxygen D. Chlorine Answer: B
- When concentrated sodium chloride solution is electrolysed, the anode product is: A. Oxygen B. Hydrogen C. Chlorine D. Sodium Answer: C
- When copper(II) sulfate solution is electrolysed with inert electrodes, the cathode product is: A. Hydrogen B. Copper C. Oxygen D. Sulfur Answer: B
- In electroplating, the object to be coated is made the: A. Anode B. Cathode C. Electrolyte D. Power supply Answer: B
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Electrolysis Continued? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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