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Describe the ways you can know that a chemical reaction has occurred. Enter your answer in the space provided.

User Tilla
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Answer: A chemical reaction is one in which rearrangement of atoms take place. A chemical reaction is characterized by following changes:

1) Absorption or release of heat. Example: Combustion reaction


CH_4+2O_2\rightarrow CO_2+2H_2O

2) formation of gas bubbles


Mg+2HCl\rightarrow MgCl_2+H_2(g)

3) Formation of precipitate


2AgNO_3(aq)+Ba(Cl)_2(aq)\rightarrow 2AgCl(s)+Ba(NO_3)_2(aq)

4) Change in color


2Mg+O_2\rightarrow 2MgO

Colorless
Mg changes to white
MgO

User Shakya
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