Exothermic processes

Key Questions

• Are all exothermic reactions spontaneous?

  Answer:

  Take the example of formation of water from Hydrogen, Oxygen this reaction highly exothermic but kinetically slow

  Explanation:

  The reaction to proceed first the reactants have to cross their activation energy barrier so that they form products giving the energy. Hence catalyst or temperature of the process plays a role in reaction to proceed spontaneously

  The other example is burning of LPG gas requires ignition for reaction to gets started even though reaction is spontaneous.

  Here is a video that explains spontaneity and signs of enthalpy and entropy:
  

  R V SUBBARAO · 2 · Oct 5 2015
• What are exothermic reactions?

  Answer:

  see answer below

  Explanation:

  Exothermic reaction is a reaction that releases heat.
  Examples are:
  - combustion
  - rusting
  -nuclear fission
  - acid/base neutralization
  -elephant toothpaste experiment
  -freezing water into ice cubes
  -burning a candle

  marfre · 1 · Jun 8 2018

• Why is burning wood exothermic? I thought the wood is taking in heat to burn, therefore endothermic. However, it then gives off heat which makes it exothermic. Which is it?
• How can an exothermic reaction be identified?
• Why is freezing an exothermic process?
• Why is respiration an exothermic process?
• Question #a5319
• What are some examples of exothermic reactions?
• What are exothermic reactions?
• What are some common mistakes students make with exothermic reactions?
• How does an exothermic reaction change the entropy of the surroundings?
• How do exothermic reactions occur?
• Why do exothermic reactions release energy?
• What are exothermic reactions used for?
• Which is a more favorable reaction: an endothermic or an exothermic reaction?
• What factors affect exothermic reactions?
• Is exergonic the same as endothermic or exothermic?
• Why do exothermic reactions release heat?
• Why are combustion reactions exothermic?
• Are all exothermic reactions spontaneous?
• What conditions must be met in order for a reaction to be considered exothermic?
• Question #a896f
• Question #b865c
• Is the freezing of water an exothermic or an endothermic process?
• Question #e7f6e
• Question #47aea
• What process is described below by the equation sugar + oxygen #-># water + carbon dioxide + energy?
• Question #2ff33
• Is the melting of candle wax an exothermic or endothermic reaction?
• When a hydrocarbon is combusted, clearly we break #C-H# and #C-C# bonds. Why are such reactions exothermic?
• How do we represent the heat evolved in exothermic reactions?
• In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?
• Find entropy, enthalpy, Gibbs free energy of reaction at 298K. Find if it is exothermic and whether it is spontaneous? C3H8 + 502 -> 3CO2 + 4H2O
• Two substances chemically reacted inside a beaker, causing the beaker to become too hot to touch. What occurred during this reaction?
• Why is jet fuel used as an aviation fuel in preference to dihydrogen gas? Does it make sense in terms of the energy yield?
• What happens to the energy released by an exothermic reaction?
• What is the relationship between products and reactants in an exothermic reaction?
• What reactions that release energy?
• In an exothermic reaction, does an increase in temperature favor the formation of products?
• In an exothermic reaction, does an increase in temperature favor the formation of products?
• When aqueous solutions of HCI and NaOH are mixed together in a calorimeter, the temperature of the solution increases. What type of reaction is this?
• What occurs when zinc metal is added to hydrochloric acid?
• Which of the following has the most exothermic lattice energy: #Ca_3N_2, CaO, SrF_2, Sr_3N_2, Ca_3P_2#?
• What is a chemical reaction that gives off energy?
• In an exergonic reaction, what is the #DeltaG#?
• What is the temperature that oxidize Zinc into Zinc oxide?????
• For #"barium carbonate"#, #"barium oxide"#, #"magnesium oxide"#, and #"magnesium chloride"#, which salt is likely to exhibit the greatest lattice enthalpy?
• Why is the reaction H2+Cl2 = 2HCl exothermic?
• When two chemicals mix causing their temperature to rise. Is this an exothermic or endothermic reaction?
• Does a negative #DeltaH# correspond to an endothermic or exothermic process?
• What does exothermic mean?
• How do we use the flame test to identify certain elements?
• Is a reaction that is exothermic and becomes more positionally random spontaneous or non spontaneous? What about less positionally random? Is there enough information to tell?
• Is a reaction that is endothermic and becomes less positionally random spontaneous or non spontaneous? What about more positionally random? Is there enough information to tell?
• How is methane oxidized?
• Why is energy lost a negative number?
• Why are freezing, condensation and deposition exothermic processes?
• In an exothermic reaction, is heat a product?
• Question #8872a
• What is an exothermic reaction?
• If the forward reaction is exothermic, why is the reverse reaction endothermic?
• What type of process occurred when salt A dissolved in water?
• Question #dcfef
• You dissolve a salt in water. How would you determine if the reaction is exothermic or endothermic??