Rates Of Reaction
Übersicht
Some reactions are over in a flash, like the explosion of a firework. Others take millions of years, like the rusting of iron deep underground. What controls how fast a reaction goes, and how can we speed one up or slow one down?
In this lesson you will learn the five factors that affect reaction rate, explain each one using collision theory, interpret rate graphs, and understand how catalysts work by providing an alternative pathway with lower activation energy. Rates questions appear on both Edexcel papers every session.
Ziele
- describe experiments to investigate the effects of changes in surface area of a solid, concentration of a solution, temperature and the use of a catalyst on the rate of a reaction
- describe the effects of changes in surface area of a solid, concentration of a solution, pressure of a gas, temperature and the use of a catalyst on the rate of a reaction
- explain the effects of changes in surface area of a solid, concentration of a solution, pressure of a gas and temperature on the rate of a reaction in terms of particle collision theory
- know that a catalyst is a substance that increases the rate of a reaction, but is chemically unchanged at the end of the reaction
- know that a catalyst works by providing an alternative pathway with lower activation energy
- draw and explain reaction profile diagrams showing ΔH and activation energy
- practical: investigate the effect of changing the surface area of marble chips and of changing the concentration of hydrochloric acid on the rate of reaction between marble chips and dilute hydrochloric acid
- practical: investigate the effect of different solids on the catalytic decomposition of hydrogen peroxide solution
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 Rates Of Reaction. 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 factor does NOT affect the rate of reaction? A) Temperature B) Concentration C) Colour of the reactants D) Surface area Answer: C
- A catalyst works by: A) Increasing the temperature B) Providing an alternative pathway with lower activation energy C) Increasing the concentration of reactants D) Being used up in the reaction Answer: B
- On a rate graph, the reaction has finished when: A) The gradient is steepest B) The curve levels off C) The curve starts D) The curve crosses the y-axis Answer: B
- Increasing temperature increases rate because: A) It decreases the activation energy B) It increases the frequency of successful collisions C) It removes the need for collisions D) It creates new reactant particles Answer: B
- Crushing a solid reactant into a powder increases the rate by: A) Lowering the activation energy B) Increasing the surface area exposed to other reactants C) Increasing the mass of the solid D) Changing the products of the reaction Answer: B
Bearbeiten Sie diese Fragen in der App
Bearbeiten Sie diese Fragen in der App
Empfohlene Bücher
Weiterlernen mit offenen Quellen
-
Lehrbuchabschnitt
Collision Theory
Use the postulates of collision theory to explain the effects of physical state, temperature, and concentration on reaction rates
"Chemistry: Collision Theory" 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/12-5-collision-theory. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
-
Lehrbuchabschnitt
Catalysis
Explain the function of a catalyst in terms of reaction mechanisms and potential energy diagrams
"Chemistry: Catalysis" 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/12-7-catalysis. 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 Rates Of Reaction 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.
