SCIENCE10-Types-of-Chemical-Reactions.pptx

Science 10
"Types of Chemical Reaction"

1. Types of Chemical Reactions

2. Chemical reaction Chemical reaction is a process in which one or more pure substances are converted into one or more different pure substance.

3. Types of Chemical Reaction 1 . Combination Reaction- a reaction when two (2) or more reactants combine to form a single product. General formula: A+B 🡺 AB EXAMPLE: H 2 (g) + O (g) = H 2 O ( l) A + B = AB

4. Types of Chemical Reaction 2. Decomposition Reaction- in this reaction, a single reactant breaks down into simpler ones. (2 or more products). This is the reverse of combination reaction. General formula: AB = A+B Examples: heat 2 HgO (s) = 2 Hg(g) + O2 (g) AB = A + B

5. Types of Chemical Reaction 3. Substitution Reaction- it is also called as single displacement reaction. In this reaction, a more active element replaces a less active element in the compound. General formula: A+BC 🡺 AC + B a. Displacement reaction in metals In a metal displacement reaction, a more active metal kicks out a less active metal from a compound. Example: Fe (s) + CuSO4 ( aq ) = FeSO4 ( aq ) + Cu (s) A + BC = AC + B

6. b. Displacement Reaction in Halogen Just like in metals, more active halogens will displace less active halogens from a compound. Example: Cl2 (g) + 2 NaI ( aq ) = 2 NaCl ( aq ) + I2 (s) A +  BC = BA + C c. Hydrogen Displacement Hydrogen can also be displaced from compounds by all alkali metals and even some alkaline earth metals. Examples: 2 Na (s) + 2 H2O (l) = 2 NaOH ( aq ) + H2 (g ) A + B C = A C + B

7. Types of Chemical Reaction 4. Double Displacement Reaction- it is characterized by the exchange of ions between two compounds. General formula: AB+CD AD+CB Examples: HCl (aq) + NaOH (aq) = NaCl (aq) + H2O (l) A B +   C D = A   D + C B

8. Thankyou for listening!