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A chemical change must occur as it is the result of a chemical reaction. A reaction could include ions, molecules, or pure atoms (elements).
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Endothermic Exothermic
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Energy – absorbed Required for reaction Absorbed energy - often heat or electrical energy.
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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.
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SYNTHESIS (Combination) DECOMPOSITION SINGLE REPLACEMENT (Displacement) DOUBLE REPLACEMENT (Double Displacement) COMBUSTION
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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
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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
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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
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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
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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
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When zinc combines with hydrochloric acid, the zinc replaces hydrogen. Zn + 2HCl ZnCl 2 + H 2 reactant + reactant ------> product + product Demonstration Time!
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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.
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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
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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).
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Howcast. " YouTube - Balancing Chemical Equations - H2O." YouTube - Broadcast Yourself.. N.p., n.d. Web. 5 Mar. 2011.. "Types of Chemical Reactions." Utah State Office of Education - USOE - Welcome. N.p., n.d. Web. 5 Mar. 2011.. brightstorm2. " YouTube - Decomposition Reaction." YouTube - Broadcast Yourself.. N.p., n.d. Web. 5 Mar. 2011.. "chemical reactions:combustion." Indiana University Northwest. N.p., n.d. Web. 5 Mar. 2011.. ochem9. " YouTube - Five Major Chemical Reactions." YouTube - Broadcast Yourself.. N.p., n.d. Web. 5 Mar. 2011.. tszheichoi. " YouTube - Hygrogen and oxygen from water." YouTube - Broadcast Yourself.. N.p., n.d. Web. 5 Mar. 2011.. MLA formatting by BibMe.org.
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