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Question: S + O2 →  SO2
Answer: In synthesis reactions, two or more reactants combine to form a single product.
Question: 2H2O → 2H2 + O2
Answer: In decomposition reactions, a single reactant is broken down into two or more products.
Question: Zn + 2HCl → H2 + ZnCl2
Answer: Also known as substitution or single replacement, a single displacement reaction consists of a single element replacing one of the elements in a compound.
Question: HCl + NaOH → NaCl + H2O
Answer: Double displacement reactions are basically an exchange of partners.
Question: 2Na + 2H2O → 2NaOH + H2
Answer: In a single displacement reaction, a single free element is substituted for one of the elements in a compound.
Question: 2Na + Cl2 → 2NaCl
Answer: Synthesis reactions are those in which two or more reactants unite to produce a single product.
Question: CaCO3 + 2HCl → CaCl2 + H2CO3
Answer: In the double displacement of ionic compounds, the positive and negative ions of each reactant are flipped in the products.
Question: CaCO3 → CaO + CO2
Answer: In chemistry, decomposition is the breaking down of a single reactant into two or more products.
Double exposure of science laboratory test tubes with bokeh and chemical reaction

Types of Chemical Reactions

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