1. Independently draw the path you took to get from your dorm or apartment to the classroom today, then share your path with your group. Where did each of you start? Where did each of you end up? Illustrate each of your trips on campus below. Which one of you put in more "energy"? Less "energy"? Briefly explain. The same idea can be applied to chemical reactions. Not all reactions go directly from reactants to products, sometimes there are other reactions that happen along the way. For example, let's evaluate the following reaction: Equation 1: CH4(g) + H2O(g) → CO(g)+ 3H2(g) AH° = ?? Think of this reaction as your "destination" or final reaction, for which we want to figure out the change in enthalpy. We can use two separate reactions each with their own independent changes in enthalpy to calculate the unknown enthalpy for equation 1. Equation 2: CO(g) + H2(g) → C(s) + H2O(g) AH° =-131.3 kJ Equation 3: C(s) + 2H2(g) → CH4(g) AH° = 74.8 kJ Chemical equations can be manipulated and added together in the same way mathematical equations can manipulated to cancel out unwanted variables or to solve for an unknown.

1. Independently draw the path you took to get from your dorm or apartment to the classroom today, then share your path with your group. Where did each of you start? Where did each of you end up? Illustrate each of your trips on campus below. Which one of you put in more "energy"? Less "energy"? Briefly explain. The same idea can be applied to chemical reactions. Not all reactions go directly from reactants to products, sometimes there are other reactions that happen along the way. For example, let's evaluate the following reaction: Equation 1: CH4(g) + H2O(g) → CO(g)+ 3H2(g) AH° = ?? Think of this reaction as your "destination" or final reaction, for which we want to figure out the change in enthalpy. We can use two separate reactions each with their own independent changes in enthalpy to calculate the unknown enthalpy for equation 1. Equation 2: CO(g) + H2(g) → C(s) + H2O(g) AH° =-131.3 kJ Equation 3: C(s) + 2H2(g) → CH4(g) AH° = 74.8 kJ Chemical equations can be manipulated and added together in the same way mathematical equations can manipulated to cancel out unwanted variables or to solve for an unknown.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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