The salinity of seawater is determined by measuring the amount of chloride ion. Why?
a) Chloride ion is part of the salt crystal.
b) Chloride must ionic bond to sodium.
c) Chloride is in every salt molecule in seawater.
d) Chloride ion is the most abundant ion in seawater and gives a more accurate result.
D
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Just after an alpha particle leaves the nucleus, would you expect it to speed up? Why?
A) No. Once the alpha particle leaves the nucleus it is slowed by the repulsion of the next closest atom's nucleus. B) No. As the alpha particle leaves the nucleus it is slowed by the constant attraction of the electrons surrounding the nucleus. C) Yes. Once the alpha particle leaves the nucleus there are no more forces acting on it and it therefore accelerates. D) Yes. Once the alpha particle leaves the nucleus it accelerates because of mutual electric repulsion with the nucleus from which it escaped.
The chief ingredient of most solar cells is
What will be an ideal response?
Imagine a square meter of leafy forest soil underneath an oak or maple tree. Which of the following is likely to exist within this patch of soil?
a. about a quarter of a million individuals b. most species would be microscopic c. about a thousand different species or organisms d. All of the listed responses would be expected to occur within this patch of soil.
How did the Earth form? How did the ocean form? Include relevant terminology, dates, and processes