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.
I would say it is a chemical change because after a while, the nails start to rust. Now they only rust after about a week though. But rust is a chemical change.
Lowered cos the higher the ph the lower the hydrogen ions
Answer:
To know this
get the pH
pH= -log(H+)
pH= -log(1x10^-5)
pH= 5.
It is Acidic.
Acidic ranges from 1 - 7
It falls within this range
