ClClClHClHClClHHH Hbonds breaknew bonds formCl2HClHClH2hydrogengaschlorinegashydrochloricacidCl22HClH2 +formation of gascolor changeformation of precipitatetemperature change & light emissionwatercarbondioxideoxygensugar6 CO2 + 6 H2O C6H12O6 + 6 O2oxygenglucosewaterlight energychlorophyllcarbon dioxideA++BABA+ BABABCD+ABCDatomsatomsmoleculemoleculemoleculesnew substancesChemical Reactions© Copyright NewPath Learning. All Rights Reserved. 94-4859Visit www.newpathlearning.com for Online Learning Resources.Substances are either chemical elements or compounds. An original substance that is involved in a chemical reaction is called a reactant, while the substance(s) produced is called a product.reactantsproductsEvidence of Chemical ReactionsDuring a chemical reaction, atoms combine to form molecules, molecules break apart to form atoms, or molecules can react with other molecules to form new substances. chemical reaction has taken place. This evidence includes the formation of gas, color change, formation of a precipitate, change in temperature, or the emission of light. valence shell attractive forcesChemical Bonds A chemical bond is an attraction between atoms that holds them together in a molecule. During a chemical reaction, the original bonds of the reactants are broken. Atoms are then rearranged and new bonds are formed between the atoms of the products. For example, when hydrogen and chlorine molecules are combined, the bonds that hold the chlorine and hydrogen atoms together break, and a new bond is formed between the chlorine and hydrogen atoms.The of atoms plays an important role in how elements interact with each other. The ease with which an atom will form chemical bonds determines its ability to undergo chemical reactions. ClClClHClHClClHHH Hbonds breaknew bonds formCl2HClHClH2hydrogengaschlorinegashydrochloricacid22foooooorrrrrrrrrrmmmmmmmaaaaaaaaaaaattttttttttttttttiiiiiiioooooooooooooooonnnnnnnnn ooooooooooofffffff ggggggggggascccccccccccccoooooooooooooollllllllooor cchhhhhhhhhhhhaaaaaaaaaaannnnnnnnnngggggggeeeeeeformation of precipitatetemperature change & light emissionwatercarbondioxideoxygensugar6 CO2 + 6 H2O C6H12O6 + 6 O2oxygenglucosewaterlight energychlorophyllcarbon dioxideAAAAAAAA++++++++++++++++BBBBBBBBBBBBA BA+ BA BBBBBBBBBBBAAAAAAAAAA BCCCCCCCCCCCCCC DDDDDA+ B DCatommmmmmmmmmmmmmmmssssssssssssssssatomsmoleculemoleculemoleeeeeeeeecccccccccccuuuuuullllllllllleeeeeeeeeeeesssssssssssnew substancesSubstances are either chemical elements or compounds. An original substance that is invvvvvvoooollvvveeeeeeeeeeeedddddddddddddd iiiiiiiiiiinnnnn aaa ccccccchhhhhhhhhhhhhhhheemical reaaaaccccccccccccccttttttttttttttiiiiiiiiiiiiiiiooooooooooooooonnnnnnnnnnnnnn iiissssssssssssss called a reactant, while the substance(s) produced is called a tproduct.reactantsproductsDuring a chemical reaction, atoms combine to formmmmmmmm mmmmmmmmmmmoooooooooooolllllllleeeeeeecullllleeeeeeeeeeeeesssssssssss,,,,,, molecules break apart to form atoms, or molecules ccccccccccccaaaaaaaaaaaannnnnnnnnnnn rrrrrrrrreeeeeeeacccccttttttttwith other molecules to form new substances. chemical reaction has taken place. This eviddddddeeeeeeeeeeeeeennnnnnnnnnnnnnnccccccccccccceeeeeeeeeeee incclllllllllllluuuuuuuuuuuuuuudddddddddddddddeeeeeeeeeeeesss the formation of gas, color change,,,,,, formatiiiiiiiiiiioooooooooooonnnnnnnn ooooooooooooofffffffffffffff aaaaaaaaaaaaaa precipitate, change in temperaturrrrrrrrrrrreeeeeeeeeee, ooooooooooorrrrrrrrrrr ttttttttttthhhhhhhhhhhhhhee emission of light. valence shell attttttrrrrrrrrrrrrrraaaaaaaaaaaccccccccccctttttttttttive forcesAAAAAAAAAAAAAAAA chheeeeeeeeeeeeeemmmmmmmmmmmmmmmmmiiiiiiicccccccccccaaaaaaaaaalllllllll bbbbbbbbbbbbbbbooooooooooonnnnnnnnnnnndddddddddddddd iiiiiiiiiissssssssssss aaaaaaaaaaaannnnnnnnnnnnn aaaaaaaaatttttttttrrrrrrrrraaaaaaaaaaaaaaaaccccccccccccctttttttttttiiiiiiion betttttttwwwwwwwwwwwwwwwwwwweeeeeeeeeeeeeeeeeeeeeeeennn aaaaaaaaaaattttttttttttttoooooooooooooommmmmmmmmmmmsttttttttttttthhhhhhhhhhhhat hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhooooooooooollllllllllllldddddddddddddddsssssss tttttttttttttttthhhhhhhhhhhhhhhhhhhhhhhhheeeeeeeeemmmmmmmmmmmmm ttttttttttttogetherrrrrr iiiiiiiiiiiinnnnnnnnnnnnnn aaaaaaaaaa mmmmmmmmmoooooooooooooollllllllllllleeeeeeeeeeeecccccule. DDDDDDDDDDDuuuuuuuuuuuurrrrrrrrrrrrriiiiiiiiiiinnnnnnnnngggggg a cheeeeeeeeeemmmmmmmmmmmmmmiiiiiiiiiiiiccccccccaaaaaaaaaaaalllllllllll rrrrrrrrreeeeeaction, the origiiiiiiiiiinnnnnnnnnnnaaaaaaaaaaaaalllllllll bbbbbbbbbooooonnnnnnnnnnnnnndddddddddddddddsssssssssssss of the reaccttttttttttttaaaaaaaaaannnnnnnnnnnnnttttttttttsssssss are broken. Atoms are thhhhhhhhhhhheeeeeeeeeennnnnnnnnnnnnn rrrrrrrrrrreeaaaaaaaaaarrrrrrrrrrrrrrrrrrrrrrrrraaaaaaaaaaaaannnnnnnnnnnnnnnngggggggggggggggeeeeeeeeeddaaaaaaannnnnnnnnnnnndddddddddddddd new bonds are formed between thhhhhhhhhhhhheeeeeeeeeee aaaaaaaaaaaatttttttttoooooooooms of thhhheee pppppppppppprrrrrrrrrrrroooooooooooodddddddddducts. For example, when hydrogen aaaaaaaaaaaaaannnnnnnnnnnnnnnd cchhhhhhhhhhhhhhhhlllllllllllllooooooooooooorrrrrrrriine mmmmmmmmmmmmmmmooooooooooolllllllllleeeeeeecules are combined, the bbbbbboooooooooooonnnnnnnnnnnnnnddddddddddddddss that hold thhhhhhhhhhhheeeeeeeeeeeee cccccccccccccccchhhhhhhhhhloriiiiiiiinnnnnnnnnnnnnnnnnneeeeeeeeeeeeeeee aaaaaaaaaaaaaannnnnnnnnnnd hydrogen aaaaatttttttttttttttttooooooooooooooooommmmmmmmmmmmmmmmmmmmmssss together break, and aa nnnnnnnnnnnnnnnnnneeeeeeeeeeeeeeeewwwwwwwwwwwwwww bboonnnnnnnnnnnnnnnnnnnnnnnddddddddddddddddddddddddddd iiiiiiiiiiiisssssssssssssss formmmmmmmmmmmmmmmmmmeeeeeeeeeeeeeeeeeeddddddddddddddddddddd between the chlorriiiiiiiiiiiiiiiinnnnnnnnnnnnnnnnnneeeeeeeeeeeeeeeee aaaaaaaaaaanddddddddd hydrogen atoms.TTTTTTTTTTTTTTThhhhhhhhhhhhhhhheeeeeeeeeeee oooooooooooooffffffffffffffff aaaaattttttttttttoooooooooooooooommmmmmmmmmmmmmmmmmss playss an important role iiiiiiiiiiiinnnnnnnnnnnnnnnn hhhhhhhhhhhhhhhoooooooow eeeeeeeeeeellllllllllllleeeeeeeeeeeeemmmmmmmmmmmmmmmments interact wwwwwwwwwwwwwwwiiiiiiiiiiiiiitttttttttttthhhhhhhhhhhhhhhh eeaaaaaaaaaaaaaccccccccccccchhhhhhhhhhhhhhh other. The eeeeeeeeeeaaaaaaaaaaaaaaassssssssssseeeeeeeeeeeeeee withhhhhhhhhhhhh wwwwwwwwwwwwwwwhhhhhhhhhhhhiichhhhhhhhhh aaaaaaaaaaaaaannnnnnnnnnnnnnnn atom wiiilllllllllllllll fffffffffffffooooooooooooooorrrrrrrrrrrrmmmmmmmmmmmmmmm ccccccccchhhhhhhhhhhhhhheeeeeeeeeeeeemical bondsdddddddddddddddeeeeeeeeeeeetttttttteeerrrrrrrrrrrrmmmmmmmmmmmmmines ittsssssss aaaaaaaaaaaaabbbbbbbbbbbbbbbbiiiiiiiiiiiillllllllllliiiiiiiiiiiiittttty toooooooooooooo uuuuuuuuuuuuunnnnnnnnnnddddddddddddddddddeeeeeeeeeeeerrrrrrrrrrrggggggggggggggggooooooooooo cccccccchhhhhhhhhhhemical reactions.
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