Answer:
A. This is a chemical reaction because only the electrons were rearranged.
Explanation:
A.P.E.X
An electrical <span>current is </span>caused<span> by </span>flow<span> of free electrons from one atom to another. </span>
Answer:
Speed of the alpha particle is
Explanation:
We have given charge on alpha particle 
Mass of the alpha particle 
Potential difference 
We have to find the speed of the alpha particle
From energy conservation we know that



The coin would probably slowly slide down whichever end it is closer to, weigh down the end of the paper, and fall off. It kinda depends on how you hold the paper though, because if it is directly in middle, and you hold it on both ends, it will stay on the paper.
I agree with the first responses