If you are in a lab and want to tell whether a reaction was exothermic, carefully check the temperature of the reaction vessel. If the reaction was exothermic, the vessel will be warmer than it was before the reaction occurred.
If you are looking at a reaction on paper, you will need a table of thermodynamic data. It should contain the molar enthalpies of formation, represented by H, of each of the reactants and products (note: if a reactant or product is an element in its most stable state, like H2(g) or Zn(s), the enthalpy of formation is defined as zero, so they may be left out of the table). Multiply the number of moles of each product and reactant by its molar enthalpy. Add up all the results for the products and subract all the results for the reactants. If your net result is negative, the reaction was exothermic. If it is positive, the reaction was endothermic.
Example:
CH4(g)+2O2(g)-->CO2(g)+2H2O(g)
Delta H (kJ/mol)
CH4(g) -74.8
O2(g) 0
CO2(g) -393.5
H2O(g) -241.82
Products: 2(-241.82)+(-393.5)= -877.14 kJ
Reactants: -74.8+2(0)= -74.8 kJ
Total: -877.14-(-74.8)= -802.34 kJ
The reaction was exothermic.
A reaction that releases energy is exothermic.
An endothermic reaction absorbs heat from its surroundings, while an exothermic reaction releases heat to its surroundings. The general formula for an endothermic reaction is: reactants + heat → products, and for an exothermic reaction: reactants → products + heat.
EXTREMELY!!!!! exothermic. As in fires and explosions exothermic.
An exothermic reaction is one that proceeds with the evolution of heat.
An exothermic reaction releases energy to its surroundings.
A reaction that releases energy is exothermic.
An endothermic reaction absorbs heat from its surroundings, while an exothermic reaction releases heat to its surroundings. The general formula for an endothermic reaction is: reactants + heat → products, and for an exothermic reaction: reactants → products + heat.
The reaction is exothermic, meaning it releases heat. The enthalpy of the reaction is negative, indicating that it is exothermic.
Heat is released during an exothermic reaction.
exothermic reaction .
An exothermic reaction releases energy in the form of heat. This type of reaction typically results in a rise in temperature in the surrounding environment. Examples include combustion and neutralization reactions.
Exothermic reaction: reaction with release of heat; for example burning of organic materials (oxydation of carbon) is a typical exothermic reaction.
Exothermic reactions
For example in an exothermic chemical reaction.
EXTREMELY!!!!! exothermic. As in fires and explosions exothermic.
I don't know for sure, but it is probably exothermic. (PLEASE CORRECT ME!)
An exothermic reaction is a reaction that releases energy in the form of heat or light. This type of reaction usually feels warm to the touch and may involve combustion or decomposition of reactants. Examples include burning wood, rusting iron, and neutralization reactions.