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.
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).
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