Presentation on theme: "A chemical reaction is a process in which one or more substances are converted into new substances with different physical and chemical properties. There."— Presentation transcript:
A chemical reaction is a process in which one or more substances are converted into new substances with different physical and chemical properties. There are five types of chemical reactions.
In a direct combination reaction, two or more reactants come together to form single product. A + B AB EXAMPLE: 2 Na + Cl 2 2 NaCl
A decomposition reaction is a reaction in which a single compound is broken down into two or more smaller compounds or elements. AB A + B EXAMPLE: CaCO 3 CaO + CO 2
In a single-replacement reaction, an uncombined element displaces an element that is part of a compound. A + BX AX + B EXAMPLE: Mg + CuSO 4 MgSO 4 + Cu
In a double-replacement reaction, atoms or ions from two different compounds replace each other. AX + BY AY + BX EXAMPLE: CaCO 3 + 2 HCl CaCl 2 + H 2 CO 3
Although the majority of chemical reactions fit into one of the four categories of chemical reactions, there are many reactions that do not. Combustion reactions are reactions in which something is burned. Oxygen gas will be a reactant in this type of reaction. EXAMPLE: 2Mg + O 2 2MgO
1. 2KClO 3 2KCl + 3O 2 2. HCl + NaOH NaCl + H 2 O 3. Mg + 2HCl MgCl 2 + H 2 4. 2H 2 + O 2 2H 2 O