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This would be 'chemical' weathering.
Acid rain would react with the minerals in the rocks, causing them to break down.
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Answer:
C boron, germanium, arsenic, silicon
AN element is composed from atoms with the same number of protons,
A compound contain two or more different elements
1.9 mol H2.
3.8 mol HCl * (1 mol H2 / 2 mol HCl) = 1.9 mol H2