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An example of a decomposition reaction is the breakdown of carbonic acid (H 2 CO 3) to carbon dioxide (CO 2) and water (H 2 O) [2]. H 2 CO 3 (aq.) → CO 2 (g) + H 2 O (l) This reaction is significant and is responsible for the fizz in soda. Below are some more examples:
Worksheet #3: Decomposition Reactions In decomposition reactions, one compound will break down into two or more parts. 1. barium carbonate Æ 2. magnesium carbonate Æ 3. potassium carbonate Æ 4. zinc hydroxide Æ 5. Iron(II) hydroxide Æ 6. nickel(II) chlorate Æ 7. sodium chlorate Æ 8. potassium chlorate Æ 9.
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A. Chemical reactions are processes involving chemical change. II. Chemical Equations. In a chemical reaction, one or more pure substances are changed to one or more other chemical substances. The substances that are changed in the reaction are called. reactants. The substances that they are changed into are called products.
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Summary. • A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB ! A + B. • Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.
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A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. The general form of a decomposition reaction is: AB → A + B AB → A + B. Most decomposition reactions require an input of energy in the form of heat, light, or electricity.
Learning objectives. Identify decomposition reactions from a word equation or symbol equation. Use the law of conservation of mass to balance simple decomposition reactions. Learning objective 1 is assessed via Q1, Q2b, Q3a, Q3b, Q4a, Q4b, Q5a–d. Learning objective 2 is assessed via Q3c, Q3d, Q4c, and Q5e.
Decomposition Reactions •Examples: CaCO 3 ( s) → CaO ( s) + CO 2 ( g) 2 KClO 3 ( s) → 2 KCl ( s) + O 2 ( g) 2 NaN 3 ( s) → 2 Na ( s) + 3 N 2 ( g) •One substance breaks down into two or more substances Combustion Reactions •Examples: CH 4 ( g) + 2 O 2 ( g) → CO 2 ( g) + 2 H 2O ( g) C3H8 ( g) + 5 O 2 ( g) → 3 CO 2 ( g) + 4 H 2O ( g)
