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fDesc[0] = "The Chemical Reactivity Worksheet (CRW) is a free program you can use to find out about the reactivity of substances or mixtures of substances (reactivity is the tendency of substances to undergo chemical change).<br /> <br /> It includes:<br /> <br /> - a database of reactivity information for more than 5,000 common hazardous chemicals;<br /> - a way for you to virtually &quot;mix&quot; chemicals--like the chemicals in the derailed tank cars above--to find out what dangers could arise from accidental mixing.";

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