1. How do endothermic reactions differ from exothermic reactions? List an example of each.

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Endothermic reactions absorb heat from their surroundings and have a positive change in enthalpy, while exothermic reactions release heat to their surroundings and have a negative change in enthalpy.

Example of an endothermic reaction: the reaction between ammonium nitrate and water to form a cold pack is an endothermic reaction as it absorbs heat from the surroundings to dissolve the ammonium nitrate.

Example of an exothermic reaction: the combustion of methane gas is an exothermic reaction as it releases heat as methane reacts with oxygen to form carbon dioxide and water.
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