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Question Using the graphic below, identify the following example chemical reactions as endothermic (right-side) or exothermic (left-side) by selecting the best graph for each. For help look to see if energy is released to the surroundings or if energy must be taken in from the surroundings. (4 points) Left-side Graph Right-side Graph Any reaction that absorbs more energy from the surroundings to proceed. A system that "feels cool or cold" to the touch. Combustion reaction in a car as octane gas burns in the presence of oxygen. Steam from hot water condenses on a mirror or window. Skip to navigation

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To classify the reactions based on the descriptions provided and the general principles of endothermic and exothermic reactions, we can analyze the behavior of energy exchange in each scenario.

  1. Any reaction that absorbs more energy from the surroundings to proceed: This is characteristic of an endothermic reaction. Therefore, this would be represented by the Right-side Graph.

  2. A system that "feels cool or cold" to the touch: This also indicates an endothermic process, where energy is absorbed and thus causes a decrease in temperature. Hence, this example corresponds to the Right-side Graph.

  3. Combustion reaction in a car as octane gas burns in the presence of oxygen: Combustion reactions are typically exothermic, as they release energy in the form of heat and light. This should be represented by the Left-side Graph.

  4. Steam from hot water condenses on a mirror or window: The condensation of steam is an exothermic process since it releases heat as steam transitions back to water. This also corresponds to the Left-side Graph.

To summarize:

  • Any reaction that absorbs more energy from the surroundings to proceed: Right-side Graph
  • A system that "feels cool or cold" to the touch: Right-side Graph
  • Combustion reaction in a car as octane gas burns in the presence of oxygen: Left-side Graph
  • Steam from hot water condenses on a mirror or window: Left-side Graph