Answered

Identify each process or chemical reaction as endothermic, exothermic, or neither:


  1. An egg cooking:
  2. A candle burning:
  3. Plaster and water combining and becoming warm:
  4. Salt being added to water, with no change in temperature:

Verified Answer :

Final answer:

The cooking of an egg, burning of a candle, and plaster mixing with water are all exothermic reactions, while adding salt to water typically shows no temperature change and can be classified as neither. This classification hinges on whether heat is absorbed or released in the reaction. Endothermic reactions absorb energy, while exothermic reactions release energy.


Explanation:

Chemical Reactions: Endothermic and Exothermic


In chemistry, reactions can be classified into endothermic, exothermic, or neither based on their heat absorption or release. Here are the classifications for the reactions you've mentioned:



  1. Egg Cooking: This process is exothermic because it releases heat as the proteins denature and solidify in the egg during cooking.

  2. Candle Burning: This is also an exothermic reaction. The combustion of the wax produces heat and light as energy is released when the wax and oxygen react.

  3. Plaster and Water Combining: This reaction is exothermic. When plaster (calcium sulfate) mixes with water, it hardens and releases heat due to the exothermic nature of the hydration process.

  4. Salt Being Added to Water: This process is typically neither endothermic nor exothermic if there is no noticeable temperature change, though in many cases, it can be slightly endothermic as it absorbs some heat from the water, but the overall temperature change is often negligible.


Understanding the nature of these reactions helps in studying thermodynamics and energy changes in chemical processes.


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