Answer:
They are physical changes.
Explanation:
This is because there in no chemical reaction taking place, just a physical change.
A physical change in a change in which the chemical structure of the substance does not change. Ice, water and steam are all the same on a molecular level, thus changing from ice to water or from water to steam are physical changes.
A chemical change is a change in which the chemical structure of the substance undergoes a change, since this does not happen going for A to B or B to C they are not chemical changes.
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Explanation:
The five common acids are sulfuric acid, hydrochloric acid, nitric acid, lactic acid, and acetic acid.
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Answer:
Q_d=35881 J/mol
So the activation energy is 35881 J/mol.
Explanation:
Consider the following equations:


Solving the above two equation to find the Q_d in term of diffusivity and temperature we will get:

where:
Q_d is the activation energy
D_1 is the diffusivity at T_1
D_2 is the diffusivity at T_2

Q_d=35881 J/mol
So the activation energy is 35881 J/mol.