Answer:
[H⁺] = 3.16 × 10⁻⁵ mol/L
Explanation:
Given data:
pH of solution = 4.5
Hydrogen ion concentration = ?
Solution;
pH = -log [H⁺]
we will rearrange this formula:
[H⁺] = 10∧-pH
[H⁺] = 10⁻⁴°⁵
[H⁺] = 3.16 × 10⁻⁵ mol/L
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.
Https://www.youtube.com/watch?v=LXDG0nqYdR4
Brainest please thank you
Answer:
Two Half-lives
Explanation:
Let number of Parent nuclei Initially present be X,
Then, finally
Parent nuclei Will remain with
daughter nuclei.
In one half- life , parent nuclei becomes half of initial.
So, starting with X parent nuclei,
After one half-life, it will degrade to
.
After another half life , Parent nuclei will become half of
Which is equal to
.
So, Parent nuclei have to go through Two half-lives.