M1 Energy & Enthalpy Problems

M1 Energy & Enthalpy Problems - Solomons Study...

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S olomon’s Study Notes General Chemistry CHE 132 Spring 2010 Midterm 1 Solomon Weiskop PhD Chapter 6 Practice Problems (Energy & Enthalpy)
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Study Notes & Practice Problems are available to print out by registering at www.solomonlinetutor.com Solomon Weiskop PhD Solomon’s CHE 1 32 Tutoring © Copyright 2010
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1 Problems numbered in blue were written by Prof. Hanson Please Note: Prof. Hanson often uses the word energy for q (i.e. for what everyone else calls “heat”). In the following problems I highlight in blue the instances where the word energy is used where anyone else would have used the word “heat”. [#1] Learning involves the growth of neural networks and conditioning them to respond with appropriate concentrations of molecules called neurotransmitters. Which one of the following statements does not characterize these neural networks? (a) They require glucose oxygen exercise and training to function effectively (b) They filter sensory signals and often only respond to things that are familiar or expected. (c) The networks that comprise short-term or working memory have a very limited capacity for information (d) The process of thinking itself changes how these networks function (e) Neural networks form very quickly so intense studying immediately before an exam is an efficient and effective way to learn. [#2] What is energy? (a) A mysterious thing that no one really understands (b) A way to keep track of the ability to do work (c) Something we get from the Sun in the form of photons (d) A fundamental quantity in the universe (e) All of these
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2 [#3] Which one of the following statements about energy is not correct? (a) Chemical energy is the energy that is released when a bond is broken (b) Energy is a fundamental component of the universe (c) Energy can be used to keep track of the ability to do work (d) There are three categories or types of energy: mass, kinetic and potential energy (e) Thermal energy is a form of energy that is associated with the random motion of atoms and molecules [#4] The Joule (J) is a unit for energy. What is 1J in the basic SI units? (a) 0.239 cal (b) 4.184 cal (c) 1kg m 2 s -2 (d) 1 kg m s -1 (e) 1 kg m s -2 [#5] Which one is not correct? (a) Formation of a chemical bond between two atoms always is an exothermic process (b) Bond breaking always is endothermic (c) Energy is released when a bond is broken and a more stable bond is formed (d) Bonds store energy and energy is released when bonds are broken (e) The bond enthalpy is the energy required to break a chemical bond between two atoms [#6] When does an endothermic reaction occur? (a) When bonds are broken (b) When bonds are formed (c) When the energy of bonds breaking is greater than the energy of bonds formed (d) When the energy of bonds breaking is less than the energy of bonds formed (e) When stronger bonds are formed and weaker bonds are broken
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3 [#7] Heat is given off when hydrogen burns in air: 2H 2 + O 2 → 2H 2 O. Why is heat produced in this reaction?
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This note was uploaded on 11/14/2010 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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M1 Energy & Enthalpy Problems - Solomons Study...

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