<span>The half-life of 9 months is 0.75 years.
2.0 years is 2.0/0.75 = 2.67 half-lives.
Each half-life represents a reduction in the amount remaining by a factor of two, so:
A(t)/A(0) = 2^(-t/h)
where A(t) = amount at time t
h = half-life in some unit
t = elapsed time in the same unit
A(t)/A(0) = 2^(-2.67) = 0.157
15.7% of the original amount will remain after 2.0 years.
This is pretty easy one to solve. I was happy doing it.</span>
Answer:
B. The reaction rate decreases
Explanation:
I just took the pre test and got a 100
The atom that can attain a stable valence electron
configuration by bonding with another atom is the hydrogen. The answer is
number 4. The elements neon, helium and radon are already stable and does not
need other elements to bond with.
Answer:
convection (I am pretty sure, I am sorry if it isnt right)
Explanation:
