Like baking a cake once you heat it, it becomes a new substance. With a chemical change you can never go back to what you had before. Also like a car rusting, a match being lite, and burning wood ( the new substance for wood is ash)
whenever a reaction takes place it either consumes energy or release energy in form of heat or light. All Exothermic reactions release energy in form of heat.
Reactions that require energy in the form of heat are called endothermic.
endothermic, (so it absorbs heat instead of giving it off. Think of endo as inside of and exo outside because exothermic gives off heat making the two opposites:))
It is called an exothermic reaction.
Example:
2 Na + 2 H20 ---> 2 NaOH + H2
chemical reaction energy requires energy in the form of heat.
Endothermic Reaction
an endothermic reaction
In an exothermic reaction heat energy is released.
You probably mean "what reaction releases energy," in which case, lots. Reactions that release energy into the environment are called exothermic reactions. An example of which would be mixing sodium (Na) and water (H2O) to form sodium hydroxide (NaOH), hydride (H2), and heat/energy. 2Na + 2H2O ---> 2NaOH + H2 + heat/energy
Chemical reaction.
True
oxygen
energy of a reaction will be lost in the form of heat.
Heat energy can stimulate a chemical reaction.
Exothermic reaction
added to a reaction in the form of heat.
Exothermic Reactions: The delta h is always NEGATIVE! Energy is released (delta is the little triangle in front of the H)
In an exothermic reaction heat energy is released.
Endothermic.
Endothermic reaction
yes
exothermic reactions release energy, like a fire, which releases heat ( also endothermic reactions requires and takes/absorbs energy for its reaction like photosynthesis which requires sunlight)
An endothermic reaction is a reaction which requires energy. The enegry is required for the reaction to take place, maning the energy is used up in the reaction. An example of an endothermic reaction is photosythesis.
Requires energy, generally in the form of heat.