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Understanding Chemical Reactions: Word Equations and Balancing

This guide explores the fundamentals of chemical reactions, describing how reactants transform into products. Learn to represent these changes using chemical equations and the importance of balancing them to reflect accurate quantities. Discover the role of catalysts in speeding up reactions and how to write skeleton equations. Additionally, the document employs pop culture references to illustrate different types of chemical reactions, making it engaging and relatable for students. Mastering these concepts is essential for a solid understanding of chemistry.

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Understanding Chemical Reactions: Word Equations and Balancing

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  1. Chemical ReactionsSpring 2014

  2. I. Describing Chemical ChangeA. Word Equations 1. A chemical reaction is the process by which one or more substances are changed into one or more different substances.2. A chemical equation represents a chemical reaction.3. A correct chemical equation shows what changes take place and the relative amounts of the various elements and compounds involved in the reaction.

  3. I. Describing Chemical ChangeA. Word Equations 4. The original substances in the reaction are called the reactants.5. The substances that are formed in the reactions are the products. a. Example: Iron + Oxygen —> Iron (II) Oxide b. Example: Hydrogen + Oxygen —>Water6. The —> means yields, gives, or reacts with to produce.

  4. I.Describing Chemical ChangeB. Chemical Equations 1. To shorten an equation, we use chemical formulas to write chemical equations.2. In a chemical equation, the —> separates the reactant and the products.3. A skeleton equation show just the formulas for the reactants and products.

  5. I. Describing Chemical Change B. Chemical Equations 4. A catalyst is added to a reaction to speed up the reaction.5. A catalyst is neither a product or a reactant so it is written over the —>.

  6. I. Describing Chemical Change C. Balancing Chemical Equations 1. An equation that does not indicate the quantity of the reactants needed to make the product is called an unbalanced equation.2. To balance the equation, the same number of elements on both sides of the equation.3. Use coefficients to balance the formulas.4. You can not change the subscripts in the formula.

  7. Guide to Chemical Reactions Hollywood style

  8. Synthesis Reaction or the Hook Up Brad Pitt + Angelina Jolie Beyonce + Jay-z Katy Perry and John Meyer Will + Jada Mariah + Nick Kim K + Kanye A + B = AB Supercouple

  9. Decomposition or the Big Breakup • Katy Perry dumps Russell Brand • Ashton Kutcher dumps Demi Moore • Rihanna dumps Chris Brown • Khloe K dumps Lamar Odom • AB = A + B Splitsville

  10. Single Displacement Reaction or the Swap Brad/Jennifer + Angelina = Brangelina + Jennifer out in the cold J-Lo/Marc Anthony + Casper Smart =J-Lo/Casper Smart + Marc Anthony out in the cold Taylor Swift/Boy A + Boy B = Taylor Swift/Boy B + Boy A out in the cold AB + C = AC + B AB + C* = A + BC* The newer version

  11. Double Displacement or the Switch Rapper T’Pain/ GFA + Rapper Lil Wanye/ GFB Switch and become Rapper T’Pain/GFB + Rapper Lil Wanye/GFA TI and Tiny + Future and Ciara Switch and become TI and Ciara + Future and Tiny ™ Wife Swap AB + CD = AD + CB

  12. Combustion Amanda Bynes, Justin Bieber, Miley Cyrus, Charlie Sheen, Amy Winehouse and Lindsey Lohan One big “hot” toxic flammable mess This will burn up quickly

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