To determine if a chemical reaction is exothermic, we need to understand a few key indicators:
1. Change in Enthalpy (ΔH):
- For an exothermic reaction, the change in enthalpy (ΔH) is negative. This means the reaction releases heat to the surroundings. So, the correct option here is:
[tex]\[\Delta H = -\][/tex]
2. Energy as a Reactant or Product:
- In the representation of an exothermic reaction, energy is considered a product. When a reaction gives off energy, it means that it releases energy during the process. Thus, the appropriate option is:
[tex]\[A + B \rightarrow C + D + \text{energy}\][/tex]
3. Energy Released or Absorbed:
- For an exothermic reaction, energy is released. This aligns with the notion that exothermic reactions result in the release of energy to the surroundings. Therefore, the correct statement is:
[tex]\[ \text{Energy is released in the reaction.} \][/tex]
To summarize, the indicators for an exothermic reaction include:
1. [tex]\[\Delta H = -\][/tex]
2. [tex]\[A + B \rightarrow C + D + \text{energy}\][/tex]
3. [tex]\[ \text{Energy is released in the reaction.} \][/tex]
These indicators collectively confirm that the reaction is exothermic.
