1. The 5 Types of Chemical Reactions

2.  Also known as – Combination reaction  It is a chemical change in which two or more substances react to forma new singular substance.  The product is a compound in this form of reaction.  You can tell this reaction has occurred because on the reactant side there are multiple substances, while on the product side there is only one product. 1. Synthesis Reactions

3. Synthesis Reaction A + B AB

4.  When a single compound (the reactant) breaks down into two or more simpler products.  This type of reaction can be identified by:  It is the exact opposite of a synthesis reaction; if you know one you know them both.  There is always one reactant. If you see one reactant that’s a compound and several products, a decomposition reaction has occurred. 2. Decomposition Reactions

5. Decomposition Reaction AB A+B

6.  A chemical change where one element replaces a second element in compound  This reaction is identifiable by its symmetry. On the reactant side there is a single element and a compound, as there is on the product side  No reaction will occur if the most reactive element is already in the compound 3. Single Replacement Reactions

7. Single Replacement Reaction A + BC AC + B

8.  A chemical change where there is an exchange of positive ions between two compounds  May also be called double-displacement reactions  Generally occurs in aqueous solution  Often produces a precipitate,a gas, or a molecular compound, water for example. 4. Double Replacement Reactions

9. AB + CD AD + BC Double Replacement Reactions

10.  A chemical change where an element or a compound reacts with oxygen.  This will often yield energy in the form of heat and light.  Oxygen is ALWAYS going to be on the reactant side of the equation. This is the main indicator that a combustion reaction has occurred. 5. Combustion Reactions

11. Combustion Reaction CH 4 + O 2 CO 2 + H 2 O + energy Methan e Carbon Dioxide Oxygen Water CH 4 + 2O 2 CO 2 + 2H 2 O + energy Balanced combustion reaction

12. Practice Problems What type of reaction is this? AgNO 3(aq) + KCl (aq) AgCl (s) + KNO 3(aq)

13. Practice Problems What type of reaction is this? AgNO 3(aq) + KCl (aq) AgCl (s) + KNO 3(aq)  This is a Double-Replacement reaction. You can tell this because there are two compounds on each side of the equation and each compound swapped the latter of the 2 elements.

14. What type of reaction is this? Br 2(l) + 2NaI (s) 2NaBr (s) + I 2(s)  This is a Single-Replacement reaction. You can tell this because there is a single element on the reactant side Br 2(l). Br 2(l) becomes part of the compound on the product side 2Nabr (s). Practice Problems

15. Fill in the blank: CH 4 + ___ CO 2 + H 2 O

16. Fill in the blank: CH 4 + ___ CO 2 + H 2 O  The answer is O 2 because this is a Combustion reaction. You can identify this as a combustion reaction because:  Oxygen is on the product side, which means it is most likely on the reactant side as well.  Carbon dioxide was formed, a common product in combustion reactions. Practice Problems

17. What type of reaction is this? Br 2(aq) + NaCl (aq) Practice Problems

18. What type of reaction is this? Br 2(aq) + NaCl (aq)  This is a trick question! There will be no reaction because Bromine is less reactive than Chlorine. Remember, if the most reactive element is already in the compound, there will be NO chemical reaction. Practice Problems

19. Quiz Yourself Answer the following question with either: Always, Frequently, or Never 1. In a combustion reaction, oxygen is ________ on the reactant side. 1. In a synthesis reaction, there are ________ two or more products. 1. A decomposition reaction ________ requires energy in the form of heat, light, or electricity.

20. Quiz Yourself Answer the following question with either: Always, Frequently, or Never 1. In a combustion reaction, oxygen is ALWAYS on the reactant side. 1. In a synthesis reaction, there are NEVER two or more products. 1. A decomposition reaction FREQUENTLY requires energy in the form of heat, light, or electricity.