A spontaneous reaction is a chemical reaction that does not need an external energy input in order to proceed. It can be thought of as a “self-sustaining” reaction, since the reactants will continue to react until they are consumed or transformed into products. These types of reactions often take place at higher temperatures and lower pressures than other types of reactions. In this blog post, we’ll look at some pairs of reactants and try to determine which one will result in a spontaneous reaction when they mix at 25°C. *NaCl + HBr = NaBr + HCl This reaction will result in a spontaneous reaction at 25°C because the reactants are both strong acids. The product of this reaction is an acid, which can also act as another reactant for other reactions. .. **Next sentences coming soon!** .. The article continues with many more examples on how to analyze pairs of chemicals that might be listed below: *AB*, *ABC*. **Please write your own next few sentences here!!**

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