160 ppm; just multiply the ratio of 40:250000 by four so it's in parts per million.
Mountains are divided into four main types: upwarped, volcanic, fault-block, and folded (complex). Upwarpedmountains form from pressure under the earth's crust pushing upward into a peak. Volcanic mountains are formed from eruptions of hot magma from the earth's core.
<span>Selenium has 6 valence electrons, shares four of them with the four F atoms and has a pair of electrons left over, so has l0 electrons in its outer energy level. Choice A</span>
Answer:
747.5 mL
Explanation:
Assuming ideal behaviour, we can solve this problem by using <em>Boyle's law</em>, which states that at constant temperature:
Where in this case:
We <u>input the data given by the problem</u>:
- 681 mm Hg * V₁ = 991 mm Hg * 513.7 mL
And <u>solve for V₁</u>:
The reason why it is not considered this is because the material was made in a lab, not through nature, which is what is required to be considered as a true mineral.