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Chapter 2: Problem 44
Write the molecular formula of ethanol. The color codes are: black (carbon), red (oxygen), and gray (hydrogen).
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Why do all atoms of an element have the same atomic number, although they may have different mass numbers? What do we call atoms of the same element with different mass numbers? Explain the meaning of each term in the symbol \({ }_{Z}^{A} \mathrm{X}\).
A common mineral of barium is barytes, or barium sulfate \(\left(\mathrm{BaSO}_{4}\right)\). Because elements in the same periodic group have similar chemical properties, we might expect to find some radium sulfate \(\left(\mathrm{RaSO}_{4}\right)\) mixed with barytes because radium is the last member of Group 2A. However, the only source of radium compounds in nature is in uranium minerals. Why?
Calculate the number of neutrons of \({ }^{239} \mathrm{Pu}\).
These phosphorus sulfides are known: \(\mathrm{P}_{4} \mathrm{~S}_{3}, \mathrm{P}_{4} \mathrm{~S}_{7}\) and \(\mathrm{P}_{4} \mathrm{~S}_{10}\). Do these compounds obey the law of multiple proportions?
Group the following elements in pairs that you would expect to show similar chemical properties: \(\mathrm{K}, \mathrm{F}, \mathrm{P}, \mathrm{Na}, \mathrm{Cl},\) and \(\mathrm{N}\)
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