Redox Reactions C
Akopọ
A blast furnace in Nigeria, Brazil or China spends its whole working life pulling oxygen off iron ore, and the moment the finished steel leaves the mill the air begins putting that oxygen back. Extraction and rusting look like completely unrelated pieces of chemistry. They are the same process running in opposite directions, and once you can see that, an enormous amount of this course stops being a list of separate reactions and turns into one idea wearing different clothes.
That idea is redox. This lesson gives you two ways of recognising it: an older definition built on oxygen, which is easy to use and works on maybe a third of the reactions you meet, and a deeper one built on electrons, which works on all of them. You will finish able to look at any equation on the specification, from a burning fuel to a lump of scrap iron in a copper solution, and say without hesitation which substance was oxidised, which was reduced, and how you know.
Awọn Afojusun
- Oxidation can be described as the gain of oxygen by a substance and reduction as the loss of oxygen from a substance.
- Oxidation can also be described as the loss of electrons and reduction as gain of electrons. Students should be able to describe chemical reactions within this specification in terms of oxidation and reduction using the definitions above.
- When oxidation and reduction are happening at the same time this is known as a redox reaction, for example: Reduction Fe2O3 + 3 CO 2 Fe + 3 CO2 Oxidation
Àwòrán ọpọlọ
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Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Redox Reactions C. 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.
- Which of these describes oxidation? A. gain of electrons B. loss of electrons C. loss of oxygen D. gain of protons Answer: B
- In the reaction Fe2O3 + 3 CO -> 2 Fe + 3 CO2, which substance is oxidised? A. Fe2O3 B. CO C. Fe D. CO2 Answer: B
- A half equation is written as Cu2+ + 2 e- -> Cu. What does this half equation show? A. Copper ions are oxidised because they gain electrons. B. Copper ions are reduced because they gain electrons. C. Copper atoms are oxidised because they lose electrons. D. Copper atoms are reduced because they lose oxygen. Answer: B
- Zinc is added to copper(II) sulfate solution: Zn + CuSO4 -> ZnSO4 + Cu. Which statement is correct? A. Zinc is reduced and copper ions are oxidised. B. Zinc is oxidised and copper ions are reduced. C. Both zinc and copper ions are oxidised. D. Neither zinc nor copper ions change, because no oxygen is present. Answer: B
- Which statement about a redox reaction is correct? A. Oxidation happens first and reduction happens afterwards. B. Only reactions containing oxygen can be redox reactions. C. Oxidation and reduction take place at the same time. D. The number of electrons lost is always greater than the number gained. Answer: C
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Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
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Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Redox Reactions C? 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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