Chem_2_2008_Summer_2 - Name _ Chemistry 2 Summer 2008 Exam...

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1 Name ______________________________________ Chemistry 2 Summer 2008 Exam 2 Chapters 6(part), 7-10 Answer the following by writing the word, words, letter, letters or number in each blank that best completes each sentence. (1 point each) 1. A(n) _________________________ is a substance that is incompletely ionized in water due to the reversibility of the reaction that forms hydronium ions, H 3 O + , in water. They yield significantly less than one H 3 O + ion in solution for each acid molecule dissolved in water. 2. A(n) _________________________ is a group represented by a substance’s chemical formula—that is, a group containing the kinds and numbers of atoms or ions listed in the chemical formula. It is a general term that can be used in reference to elements, molecular compounds, or ionic compounds. 3. A(n) _________________________ is a chemical formula that includes positive integers that describe the simplest ratio of the atoms of each element in a compound. 4. A(n) _________________________ is a mixture whose particles are so evenly distributed that the relative concentrations of the components are the same throughout. Solutions can also be called homogeneous mixtures. 5. A(n) _________________________ is a chemical equation for which the spectator ions have been eliminated, leaving only the substances actively involved in the reaction. 6. A(n) _________________________ change is a change that leads to heat energy being released from the system to the surroundings. 7. A(n) _________________________ is a substance that generates at least one hydroxide ion in solution for every unit of substance added to water. 8. _________________________ is any chemical change in which at least one element loses electrons, either completely or partially.
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2 9. A(n) _________________________ is the electrode at which oxidation occurs in a voltaic cell. It is the source of electrons and is the negative electrode. 10. A(n) _________________________ is the portion of a voltaic cell that allows ions to flow. 11. A(n) _________________________ is a battery that is not rechargeable. 12. _________________________ is the process by which a redox reaction is pushed in the nonspontaneous direction or the process of applying an external voltage to a voltaic cell, causing electrons to move from what would normally be the cell’s cathode toward its anode. Answer the following by writing one of these words or phrases in each blank. (1/2 point each)
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Chem_2_2008_Summer_2 - Name _ Chemistry 2 Summer 2008 Exam...

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