Most reactions follow one of a few patterns. Substances join, split up, change places, or swap partners. In this course we learn the patterns, and we learn what oxidation and reduction mean.
3 lessons, about 1 h 15 min3 simulations10 problems6 practice questionsPython in every lesson
Created by StemPy LabIn a combination reaction, two or more substances join to make one. In a decomposition reaction, one substance breaks into two or more. Decomposition can be caused by heat, light or electricity.
In a displacement reaction, a more reactive element takes the place of a less reactive element in a compound. In a double displacement reaction, two compounds swap their partners, often with a precipitate. The reactivity series tells us which metal displaces which.
Oxidation is the gain of oxygen or the loss of hydrogen by a substance, and reduction is the loss of oxygen or the gain of hydrogen. They always happen together in a redox reaction. The substance that gives oxygen or takes hydrogen is the oxidising agent, and it is itself reduced. The substance that takes oxygen or gives hydrogen is the reducing agent, and it is itself oxidised. Burning, rusting, the browning of a cut apple and the extraction of metals from ores are all examples. Heating copper in air makes black copper oxide, and passing hydrogen over it brings back brown copper.
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