Thw answer is PHj78 JJ CP30 R2D2
Cu + S ---> CuS
by reaction 1 mol 1 mol
from the problem 0.25 mol 0.25 mol
0.25 mol Cu
I just took a test with this question and got the answer wrong for saying ethane. The correct answer is propane.
The term which is described as a long, narrow depression in the ocean floor would be ocean trench. They <span>are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor. Hope this answers the question.</span>
It is a physical change because only the states as being changes, not the actual bonds in the compound.
