Answer:The physical changes that are endothermic are melting, vaporization and sublimation.
Explanation:
Answer:
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Explanation:
i believe that this should be the correct answer i punched in the numbers of conversion based off of what you put in your question.
The answer is C. They lower the activation energy of an elementary step of a reaction
This makes the reaction rate to increase since less energy is required to make a reaction occur.
Energy must be absorbed to for the electron to transfer from
ground state to a much higher energy level. In the same manner, Energy is
emitted when the electron is transferred from a higher energy level to a lower
energy level. Thus,
n=3 to n=5 à
absorb
n=1 to n=3 à
absorb
n=3 to n=2 à
emit
n=2 to n=1 à
emit
<span>more force than walking, you'll burn more energy by running the <span>mile</span></span>
