440 cause mass cant be created or destroyed
Answer:10,0000 years
Explanation:
If it takes 2000 years to weather 1cm of limestone
It will take 5*2000 years to weather 5cm of limestone. This gives us 10000 years.
The Answer Is B Because You Have To Divide The 9
It is false because an endothermic reaction will also start when energy is received from the environment when there is no solution involved
Answer:
i) 
ii) 
ii) 
Explanation:
As the initial and final states of the sample are the same, the ΔU of the sample is, for the three cases
since 
i)Reversibly 
so 
can be calculated by
and because of the first law of thermodynamics
ii)Irreversibly with 
we can calculate 
by the law of ideal gases
then w can be calculated by
and
iii)a free expansion 
so 
(there's no work at vaccum) and 
