write an answer for the following question in the space provided. 5. patrick is giving a presentation on…

write an answer for the following question in the space provided. 5. patrick is giving a presentation on thermal energy to his class. he knows some reactions require thermal energy to occur and others produce thermal energy during the reaction. name and provide an example of each type of reaction.

write an answer for the following question in the space provided. 5. patrick is giving a presentation on thermal energy to his class. he knows some reactions require thermal energy to occur and others produce thermal energy during the reaction. name and provide an example of each type of reaction.

Answer

Answer:

Endothermic reaction: A reaction that requires thermal energy to occur. Example: The decomposition of calcium carbonate ($CaCO_3$) into calcium oxide ($CaO$) and carbon - dioxide ($CO_2$) when heated. The chemical equation is $CaCO_3(s)\xrightarrow{\Delta}CaO(s)+CO_2(g)$.

Exothermic reaction: A reaction that produces thermal energy during the reaction. Example: The combustion of methane ($CH_4$). When methane burns in oxygen, it releases heat. The chemical equation is $CH_4(g) + 2O_2(g)\rightarrow CO_2(g)+2H_2O(g)+ \text{heat}$.

Brief Explanations:

Endothermic reactions absorb heat from the surroundings, often indicated by a decrease in temperature of the reaction environment. Exothermic reactions release heat to the surroundings, usually causing an increase in temperature. The examples given are common representatives of each type of reaction.