Chemical reactions and new substances – basic principles
How it works
A chemical reaction is a process in which new substances (products) with different properties are formed from starting substances (educts). Chemical bonds are broken and new ones are formed in the process. Typical signs of a chemical reaction are changes in color, gas formation, changes in temperature, emission of light, or the formation of a solid from a solution (precipitate). The products differ in their properties from the starting substances. However, not every visible change is a chemical reaction: when melting, evaporating, or crushing, no new substance is formed; these are physical processes.
In a chemical reaction, new substances with different properties are formed from certain starting substances. Signs of this can include, for example, changes in color, changes in smell, gas formation, changes in temperature, or the formation of a precipitate.
An example
What is a typical characteristic of a chemical reaction?
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50 Exercises
To the learning unit →Own explanation and own practice exercises by AmyMath. Subject reference framework: Chemistry. The topic assignment may vary by federal state.