jijoh. - Laboratory 6 Chemical Reactions and Balancing...

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Laboratory 6 Chemical Reactions and Balancing Chemical Equations Name: AZIZAH AHMAD Partner: NORKHAIRIN YUSUF Section: Section 40, Monday 2 PM Performed: 13 October 2008 Submitted: 20 October 2008 Laboratory Instructor: HONGMEI YUAN Your Signature ___________________________________
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Purpose The purpose of this lab was to observe what will occur when two aqueous solutions are mixed and write a balanced chemical equation to represent it. Introduction There are situations when we can predict when a chemical reaction will occur between two aqueous substances and those depend upon the possible products. A reaction will occur IF any one (or more) of the following products is (are) formed : a substance insoluble in water or precipitate, a gaseous substance, and a weak electrolyte. After it is observed that a reaction appears to occur (or that it is predicted to occur), a chemical equation is the best way to represent this. For reactions of two compounds, the general “best guess” for the reaction is called metathesis or double replacement. This is where the two positive ions change places (or the two negative ions change places) to form two possible compounds. AB + CD CB + AD A balanced molecular equation is very useful when doing calculations about quantities needed to measure when provided with a container of the various compounds. However, often we are interested in more than the molecular equation and want to indicate the ionic state. We would then rewrite this, remembering that a gas, pure liquid (such as water), and a solid will not be ionized. The equation is then called a balanced ionic equation. Frequently, a chemist is only interested in what changes during the reaction and wants to remove items that don’t change (called spectators). So let us do two things at first: remove the physical state notation (subscripts) to simplify and remove the parentheses, multiplying through when appropriate. We can cancel anything which is exactly the same on the same sides, leaving with a balanced net ionic equation. If desired, the physical states could be inserted again to give the equation below as the final answer.
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This note was uploaded on 03/18/2010 for the course COS 101121501 taught by Professor Langner during the Fall '08 term at RIT.

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jijoh. - Laboratory 6 Chemical Reactions and Balancing...

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