Out of the three you gave ecosystem is what I would call the most broad. An ecosystem includes living AND non-living things in an area
Community is all the LIVING things in an area (plants are included and I think bacteria is too, but I'm not sure)
Population is pretty narrow it just looks at specific species in one area. Population of mosquitoes doesn't include butterflies, if only looks at mosquitoes
Hope this helped!
The answer is B. Nitrogen and sulfur oxides combine with rain percipitation to form sulfuric acid rain.
The student should set up an experiment in which he will require a crucible, a sample of hydrated copper sulfate (CuSO₄ <span>• 5H</span>₂O), a hot plate and a digital mass balance.
First, the student should check the mass of the empty crucible, then add the sample to the crucible and check the mass again. The difference is the mass of the sample.
Next, the student should place the crucible on a hot plate and begin heating the sample. After regular time intervals, such as two minutes, the students should measure the mass of the crucible and sample and note it down until it stops decreasing.
After a final mass of the sample has been obtained, the student may subtract this from the initial mass and find the mass of water evaporated.
Answer:
![t=46.13days](https://tex.z-dn.net/?f=t%3D46.13days)
Explanation:
Hello there!
In this case, since the radioactive decay is considered as first-order kinetic model, whereby the remaining mass of the radioactive material involves the initial one, the rate constant and elapsed time:
![A=Ao*exp(-kt)](https://tex.z-dn.net/?f=A%3DAo%2Aexp%28-kt%29)
As we were not initially given the rate constant, we can use the half-life to calculate it as follows:
![k=\frac{ln(2)}{8.040days}=0.08621days^{-1}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7Bln%282%29%7D%7B8.040days%7D%3D0.08621days%5E%7B-1%7D)
Thus, we can calculated the elapsed time for the given conditions to obtain:
![t=\frac{ln(0.75g/40.0g)}{-0.08621days^{-1} }\\\\t=46.13days](https://tex.z-dn.net/?f=t%3D%5Cfrac%7Bln%280.75g%2F40.0g%29%7D%7B-0.08621days%5E%7B-1%7D%20%7D%5C%5C%5C%5Ct%3D46.13days)
Regards!