 A chemical change must occur as it is the result of a chemical reaction.  A reaction could include ions, molecules, or pure atoms (elements).

 Endothermic  Exothermic

 Energy – absorbed  Required for reaction  Absorbed energy - often heat or electrical energy.

 Energy - released  Released energy - originally stored in bonds of reactants  Often heat given off causes product(s) to feel hot.  Reactions involving combustion or burning are exothermic chemical reaction.

 SYNTHESIS (Combination)  DECOMPOSITION  SINGLE REPLACEMENT (Displacement)  DOUBLE REPLACEMENT (Double Displacement)  COMBUSTION

 Two or more reactants yielding one product is a way to identify a synthesis reaction.  Generic Example: A + B AB H 2 + O H 2 O

 Simple hydrogen gas combined with simple oxygen gas can produce a more complex substance --- water! S + O 2 SO 2 S + O 2 SO 2 reactant + reactant > product

 A more complex substance (reactant) breaks down into its more simple parts (products). AB A + B  Synthesis and decomposition reactions are opposites.  catalyst – a substance that causes or accelerates a chemical reaction without itself being affected.chemical reaction

 Water can be broken down into hydrogen gas and oxygen gas. 2H 2 O 2H 2 + O 2 2H 2 O 2H 2 + O 2 2H 2 O 2H 2 + O 2 2H 2 O 2H 2 + O 2 reactant > product + product

 In a single replacement reaction a single uncombined element replaces another in a compound. Two reactants yield two products. A + BC AC + B Mg + 2AgNO 3 Mg(NO 3 ) 2 + 2Ag

 When zinc combines with hydrochloric acid, the zinc replaces hydrogen. Zn + 2HCl ZnCl 2 + H 2 reactant + reactant > product + product Demonstration Time!

 In a double replacement reaction parts of two compounds switch places to form two new compounds. Two reactants yield two products. AB + CD AD + CB precipitate - to separate (a substance) in solid form from a solution, as by means of a chemical reaction.

 When silver nitrate combines with sodium chloride, two new compounds are formed --silver chloride and sodium nitrate -- because the sodium and silver switched places. AgNO 3 + NaCl AgCl + NaNO 3

 Combustion reactions always involve molecular oxygen O2. combustion reaction combustion reaction  Anytime anything burns (in the usual sense), it is a combustion reaction. combustion reaction  Combustion reactions are almost always exothermic (i.e., they give off heat).

Howcast. " YouTube - Balancing Chemical Equations - H2O." YouTube - Broadcast Yourself.. N.p., n.d. Web. 5 Mar "Types of Chemical Reactions." Utah State Office of Education - USOE - Welcome. N.p., n.d. Web. 5 Mar brightstorm2. " YouTube - Decomposition Reaction." YouTube - Broadcast Yourself.. N.p., n.d. Web. 5 Mar "chemical reactions:combustion." Indiana University Northwest. N.p., n.d. Web. 5 Mar ochem9. " YouTube - Five Major Chemical Reactions." YouTube - Broadcast Yourself.. N.p., n.d. Web. 5 Mar tszheichoi. " YouTube - Hygrogen and oxygen from water." YouTube - Broadcast Yourself.. N.p., n.d. Web. 5 Mar MLA formatting by BibMe.org.