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By Michael Buckley

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Circle the term in each pair that makes the statement true. 1. At the beginning of the reaction the reactants are sulfur dioxide (SO2) and [oxygen (O2) / sulfur trioxide (SO3)]. 2. The product of the reaction is [oxygen (O2) / sulfur trioxide (SO3)]. 3. The amounts of each substance present at equilibrium are found on the [left / right] side of the graph. 4. The least abundant gas at equilibrium is [oxygen (O2) / sulfur trioxide (SO3)]. 5. Once equilibrium is reached, the amounts of reactants and products will [continue to change / stay the same].

The table to the right lists the pH of several common items. List the items in order from most acidic to most basic. 1 Physical Science Saddleback Publishing, Inc. com 41 Name Date Naming Acids and Bases Acids are substances that produce hydrogen ions (H+) in a water solution. There are two types of acids, acids made of two elements and acids made of more than two elements, one element being oxygen. You can use the following rules for naming an acid: • Examine the formula; if there are only two elements, then go to 2; if there are three elements go to 3.

During the time interval T = 10 to T = 20 the speed of the object is 5. Therefore, the acceleration is . 6. During the time interval T = 20 to T = 35 the speed of the object is Therefore, the acceleration is . 7. During the time interval T = 20 to T = 25 the speed goes from m/s or a change in speed of T = 30 is . m/s to m/s in 5 s. The change in speed from T = 25 to m/s in 5 seconds. Therefore, acceleration is . Physical Science Saddleback Publishing, Inc. com 51 Name Date Balanced and Unbalanced Forces Explore the nature of balanced and unbalanced forces.

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