Electrolysis Continued
Akopọ
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.
Awọn Afojusun
- 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).
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Electrolysis Continued. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Electrolysis Continued? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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