Which of the following is best describes an exothermic reactions? Absorbs heat from surrounding, Releases heat into surroundings, Requires no energy, Occurs at low pressures
- Absorbs heat from surrounding
- Releases heat into surroundings
- Requires no energy
- Occurs at low pressures
Explanation
The best description of an exothermic reaction is that it releases heat into the surroundings.
This causes the temperature of the surroundings to increase.
Key characteristics of exothermic reactions:
Releases heat:
The word "exo" means "out" and "thermic" means "heat," so the energy exits the system
Energy change:
The products of the reaction have less chemical potential energy than the reactants.
The energy difference is released into the surroundings, often as heat.
Negative enthalpy change:
In thermochemistry, this is represented by a negative change in enthalpy (Delta H<0).
Examples: Common examples include burning a substance, rusting iron, and the reaction that occurs inside hand warmers.
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