Integrated Science
Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 9, Problem 14CQ
To determine

The reason that a pure substance you have is a compound and not an element.

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What is a compound? Cite three examples.
Today I submitted this question and was given and answer but I cannot figure out where the 8 O came from in the solution without looking up how much oxygen weighs. Can you explain to me how this is solved with only the information in the question - If 112 g of silicon (Si) react completely with 64 g of oxygen (O) to form silica (SiO2), what is the atomic weight of silicon? I am supposed to solve it not using a periodic table and am very confused as to how to get to the answer in the book, 28.
One amazing and useful fact about nature is that different elements and molecules each have a unique pattern of energy levels available to their electrons. These different patterns lead to different possible energy transitions for each element or molecule. How might scientists use this fact to identify the elemental composition of a distant star without even visiting the star?
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