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Unformatted text preview: (1) AP is a registered trademark of the College Board. The College Board was not involved in the production of and does not endorse this product. (2) Test Questions are Copyright 1962-2008 by College Entrance Examination Board, Princeton, NJ. All rights reserved. For face-to-face teaching purposes, classroom teachers are permitted to reproduce the questions. Web or Mass distribution prohibited. WRITING AP* NET IONIC EQUATIONS AP equation sets are found in the free-response section of the AP test. You are given eight equations and you must choose to answer five of these.** The equations are of mixed types. The section is worth 15 points and is 15 % of the free response grade. Free response is 55% of the total AP test grade. All AP equations &quot;work&quot;. In each case, a reaction will occur. These equations need to be written in net ionic form. All spectator ions must be left out and all ions must be written in ionic form. All molecular substances and nonsoluble compounds must be written together (not ionized!). Weak electrolytes, such as acetic acid, are not ionized. Solids and pure liquids are written together, also. A saturated solution is written in ionic form while a suspension is written together. AP equations do not need to be balanced. Don't waste your time on balancing! Each equation is worth a total of 3 points. One point is given for the correct reactants and two points for all correct products. If a reaction has three products, one point is given for two correct products and two points for all correct products. Leaving in the spectator ions will result in a one point deduction on the equation set (not 1 point per problem). The best way to prepare for the equation section of the AP test is to practice lots of equations. The equation sets are similar and some equations show up year after year. When you are reading an equation, first try to classify it by type. If it says anything about acidic or basic solution, it is redox. If you are totally stuck, look up the compounds in the index of your book or other reference books and try to find information that will help you with the equation. All reactions do not fit neatly into the five types of reactions that you learned in Chemistry I. Save the reactions that you write and practice them again before the AP test in May. Kristen Henry Jones 01/28/99 ** There was a format change in 2007. Now students are given 3 equations and only 3 equations, each worth 5 points. They must write the net ionic equation (3 points total: 1 point for set of reactants and 2 points for products), balance the net ionic equation ( the 4 th point), and answer a descriptive question about the reaction (the 5 th and final point). The methods presented in this document still hold true, but be sure and require students to balance the equations by mass and charge even though they are not balanced on the key! Kristen Henry Jones 01/28/99 Used with permission....
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- Spring '11