Endothermic And Exothermic Reactions Flashcards
What is energy?
Think of energy as stuff you’re able to do when you feel “energetic”
Example: speed, height,sound, heat, light.
2. Or as where you get this “energetic “ feeling from…
Example: calories (food)
physical change
A physical change does not alter the chemical formula of a substance.
All physical changes involve energy
Chemical change
A chemical change (aka chemical reaction) does alter the chemical formula of a substance.
All chemical changes involve energy.
When a chemical reaction takes place… what is the “system” and what is the “surroundings”?
1.The “system” is the chemical involved in the reaction (reactants and products )
2. The “surroundings” is everything else in the universe.
What does the Law of Conservation of Energy say?
Energy cannot be created or destroyed.
Therefore … energy that leaves the system must go to the surroundings (and vice versa)
Most reactions have an activation energy. This is because…
Breaking bonds require energy and forming bonds releases energy