Types of Reactions (7.2)

1. Types of Reactions(7.2) By Justin Sloan, Lucas jones and Gary Rogers

2. Classifying Reactions • You can classify reactions into different types. • There are many different types of chemical reactions there are Synthesis, decomposition, single and double replacement and also a combustion reaction.

3. Single replacement Reaction • A single replacement reaction is when one element takes the place of another element in a compound. • The general form is A + BC B + AC • Usually when these reactions happen it is a solid being added to a solution. • An example is this copper wire in a silver nitrate solution the solution turns blue and the copper wire has silver crystals on it.

4. Double replacementReaction • Adouble replacement reaction is when two different compounds exchange positive ions and form two new compounds. • This is the general form of a double replacement reaction. • In order for a double replacement reaction to occur both elements must be soluble in water • They usually take place when two solutions are mixed together

5. Reduction Reduction is when an element gains electrons during a chemical reaction. Reduction occurs when the oxidation number of an atom decreases.

6. Combustion Reaction A combustion reaction is when a substance reacts with oxygen. The reaction takes place when a fuel and oxidant react which produces heat or heat and light. The most recognizable form of a combustion is a flame

7. Oxidation • Oxidation is any process when an element loses electrons during a chemical reaction. • An example of this would be calcium reacting with oxygen.

8. Synthesis Reaction • A synthesis reaction is a reaction when two or more substances react to form a single substance. • For the reaction to work there has to be a cation and an anion • An example of this would be sodium metal reacting with chlorine to form sodium chloride. 2Na(s) + Cl2(g)2NaCl(cr)

9. Decomposition Reaction • A decomposition reaction is a reaction when a compound breaks down into two simpler substances. • This reaction often requires exposure to a catalyst such as heat or a solvent. • An example would be water being broken down into hydrogen and oxygen.

10. Quiz • Name two types of reactions. • What happens during oxidation. • What does a synthesis reaction require for it to react. • Give an example of a decomposition reaction • What does a combustion reaction produce Next five are true or false • A decomposition reaction is when a compound breaks down into simpler substances • A combustion reaction is when it reacts with magnesium • Reduction is when an element loses electrons • Double replacement reaction is when compounds exchange positive ions • A synthesis reaction forms a single substance

11. Answer Key • Any reaction listed in the PowerPoint • Process when an element loses electrons • Cation and anion • Any reaction when a compound breaks down into simpler substances • Heat or heat and light • True • False • False • True • True

12. Work cited • (2003-2013): 1. Print. <http://www.wisegeek.com/what-is-a-decomposition-reaction.htm>. • http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/oxred.html • n. page. Print. <http://www.east-buc.k12.ia.us/03_04/CE1/KE/k_e4.htm>. • http://www.iun.edu/~cpanhd/C101webnotes/chemical%20reactions/combustion.html