Define chemical reaction. State four observations which helps us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation
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Explanation:
Chemical reaction is a process in which one or more reactants are converted into products.
The product may be one or more. The chemical reaction can involve an element or a compound which leads to the formation of product or products.
The observation which may be used to show that a chemical reaction has taken place may include;
1. Change in colour- Reaction of Bromine and ethene
( Br2(l) + C2H4⇒ CHBrCHBr)
2. formation of a precipitate- silver nitrate and NaCl
(AgNO3 (aq) + NaCl= AgCl(s) + NaNO3)
3. Temperature change
4. Change of smell
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