Redox (continued)
Übersicht
When iron rusts, when a fuel burns, when a battery drives your phone, the same hidden bargain is taking place: one substance loses something and another gains it. That bargain is a redox reaction, the simultaneous oxidation and reduction that powers an enormous slice of chemistry, biology and industry.
In this lesson you will learn redox three ways: as the gain and loss of oxygen, as the transfer of electrons, and as a change in oxidation number. You will assign oxidation numbers with Roman numerals, spot oxidising and reducing agents, and read the tell-tale colour changes that prove a redox reaction has happened.
Ziele
- Use a Roman numeral to indicate the oxidation number of an element in a compound.
- Define redox reactions as involving simultaneous oxidation and reduction.
- Define oxidation as gain of oxygen and reduction as loss of oxygen.
- Identify redox reactions as reactions involving gain and loss of oxygen.
- Identify oxidation and reduction in redox reactions.
- [Supplement] Define oxidation in terms of: (a) loss of electrons (b) an increase in oxidation number.
- [Supplement] Define reduction in terms of: (a) gain of electrons (b) a decrease in oxidation number.
- [Supplement] Identify redox reactions as reactions involving gain and loss of electrons.
- [Supplement] Identify redox reactions by changes in oxidation number using: (a) the oxidation number of elements in their uncombined state is zero (b) the oxidation number of a monatomic ion is the same as the charge on the ion (c) the sum of the oxidation numbers in a compound is zero (d) the sum of the oxidation numbers in an ion is equal to the charge on the ion.
- [Supplement] Identify redox reactions by the colour changes involved when using acidified aqueous potassium manganate(VII) or aqueous potassium iodide.
- [Supplement] Define an oxidising agent as a substance that oxidises another substance and is itself reduced.
- [Supplement] Define a reducing agent as a substance that reduces another substance and is itself oxidised.
- [Supplement] Identify oxidising agents and reducing agents in redox reactions.
Audiolektion
Diese Lektion in der App anhoren
Mindmap
Dieses Thema ist als Karte dargestellt, damit die Zusammenhange sichtbar werden.
Mindmap in der App offnen
Lernkarten
Schnelles Abfragen der Fakten, die zu diesem Thema gepruft werden.
Diese Karten in der App uben
Lektionshinweis
Vollstaendige Lernnotiz in der Green Bridge App
Holen Sie sich die Green Bridge CBT App auf Handy oder Computer fuer die komplette IGCSE-Bibliothek: fruehere Pruefungen, Bewertungsschemata, Mindmaps, Lernkarten und Audiolektionen.
Unterrichtsbewertung
Herzlichen Glückwunsch zum Abschluss der Lektion über Redox (continued). Jetzt, da Sie die wichtigsten Konzepte und Ideen erkundet haben,
Sie werden auf eine Mischung verschiedener Fragetypen stoßen, darunter Multiple-Choice-Fragen, Kurzantwortfragen und Aufsatzfragen. Jede Frage ist sorgfältig ausgearbeitet, um verschiedene Aspekte Ihres Wissens und Ihrer kritischen Denkfähigkeiten zu bewerten.
Nutzen Sie diesen Bewertungsteil als Gelegenheit, Ihr Verständnis des Themas zu festigen und Bereiche zu identifizieren, in denen Sie möglicherweise zusätzlichen Lernbedarf haben.
- Which statement defines oxidation in terms of electrons? A. Gain of electrons B. Loss of electrons C. Gain of protons D. Loss of neutrons Answer: B
- What is the oxidation number of an element in its uncombined state? A. +1 B. -1 C. 0 D. equal to its group number Answer: C
- In the reaction CuO + H2 -> Cu + H2O, the reducing agent is: A. CuO B. H2 C. Cu D. H2O Answer: B
- An oxidising agent is a substance that: A. is itself oxidised B. oxidises another substance and is itself reduced C. loses oxygen only D. gains electrons from no other species Answer: B
- When iodide ions turn acidified potassium iodide from colourless to yellow-brown, the iodide ions are: A. reduced B. oxidised C. unchanged D. acting as an oxidising agent Answer: B
Bearbeiten Sie diese Fragen in der App
Bearbeiten Sie diese Fragen in der App
Empfohlene Bücher
Weiterlernen mit offenen Quellen
-
Lehrbuchabschnitt
Classifying Chemical Reactions
Define three common types of chemical reactions (precipitation, acid-base, and oxidation-reduction)
"Chemistry: Classifying Chemical Reactions" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/4-2-classifying-chemical-reactions. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
Von anderen Organisationen unter offenen Lizenzen veröffentlicht und wie gewünscht genannt. Links öffnen deren Websites.
Übungsklausuren üben
Möchten Sie Übungsklausuren zu Redox (continued) üben? Laden Sie die Green Bridge CBT App herunter, um Übungsklausuren und vollständige Prüfungssimulationen zu diesem Thema zu erhalten.
Lade die App im Google Playstore herunter.
Alles, was du brauchst, um in JAMB, WAEC & NECO zu glänzen.
