Chemical reactions involve reactants converting to products with different properties, represented by chemical equations. Examples include rusting (4Fe + 3O2 → 2Fe2O3) and combustion (C3H8 + 5O2 → 3CO2 + 4H2O).
Common signs of chemical reactions include color changes, temperature changes, odor release, gas bubbles, and solid precipitates.
Exothermic reactions release energy (e.g., combustion), while endothermic reactions absorb energy (e.g., dissolving salts in water).
Oxidation and Reduction
These involve electron transfer; oxidation is the loss of electrons, and reduction is the gain. Redox reactions, like the formation of iron sulfide (Fe + S → FeS), include both processes.
Combination reactions form one product from reactants (C + O2 → CO2), while decomposition reactions break a compound into multiple products (2H2O → O2 + 2H2).
Dive deeper into chemical reactions and their types with resources and worksheets at eTutorWorld.com.