Question

describes changes
in energy during a chemical reaction?

Answer 1

Answer:

Yes

Explanation:

Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.

Answer 2

• Energy changes occur during chemical reactions because different amounts of energies are involved in breaking a bonds in reactants and making of bonds in products. Depending upon whether heat is evolved or absorbed during a reaction, the reaction can be exothermic or exothermic.

Exothermic reaction - A chemical reaction in which heat energy is given out .

Buring of natural gas , respiration, formation of compost from vegetables matter also exothermic processes.

Examples

C(s)+O2(g)⸻➤CO2(g)+94.00kcal

2H2(g) +O2(g)⸻➤2H2O(l) +136.0kcal

Endothermic reaction - A chemical reaction in which heat energy is absorbed is called endothermic reaction.

Example

C(s)+2S⸻➤CS(l)-22kcal

C(s)+H2O⸻➤CO(s) +H2(s)-31.4 kcal

{ ⸻➤at 1100°C }