Endothermic And Exothermic Reactions Flashcards

1
Q

What is energy?

A

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)

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2
Q

physical change

A

A physical change does not alter the chemical formula of a substance.
All physical changes involve energy

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3
Q

Chemical change

A

A chemical change (aka chemical reaction) does alter the chemical formula of a substance.
All chemical changes involve energy.

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4
Q

When a chemical reaction takes place… what is the “system” and what is the “surroundings”?

A

1.The “system” is the chemical involved in the reaction (reactants and products )
2. The “surroundings” is everything else in the universe.

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5
Q

What does the Law of Conservation of Energy say?

A

Energy cannot be created or destroyed.
Therefore … energy that leaves the system must go to the surroundings (and vice versa)

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6
Q

Most reactions have an activation energy. This is because…

A

Breaking bonds require energy and forming bonds releases energy

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