Chem midterm 1 - 1.

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1.   If 200.0 g of zinc sulfide contains 134.2 g of zinc, what mass of zinc in g  is contained in 1.205 kg of zinc sulfide?  Do not enter units with your answer.   Student Response Correct Answer Answer: 808.6   809 Score: 1/1    2.   Which of these best describes the set of elements below?  selenium, silicon, bromine    Score: 0/1    3.   A hypothetical metal, M, has two stable isotopes,  31 M (isotopic mass = 30.97 amu) and  35 M (isotopic mass =  34.91 amu). If the atomic mass of M in the periodic table is 32.66 amu, what is the percent abundance of  31 M?  Do not type units with your answer. 
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  Answer: Score: 1/1    4.   What stable monatomic ions do rubidium (Z = 37) and selenium (Z = 34) form?    Score: 1/1    5.   What is the formula of tetraphosphorus trisulfide? Enter your answer with atomic symbols and numbers, such  as A2B3, without any spaces. Do not include the number "1" in any formula.    1.  Score: 1/1   
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6.   What is the sum of the numbers of neutrons and electrons in the ion  120 Sb 2+   Answer: Score: 1/1    7.   Determine the number of moles of aluminum atoms in 11.4 grams of aluminum.    Score: 1/1    8.   Which formula could not be that of a straight-chain alkane?   
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  Score: 1/1    9.   Convert the description into a balanced equation with the smallest set of coefficients. When nitrogen dioxide is bubbled into water, a solution of nitric acid forms and gaseous nitrogen monoxide is  released.    Score: 1/1    10.   Household sugar, sucrose, has the molecular formula C 12 H 22 O 11 . What is the % of carbon in sucrose, by mass?   
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  Score: 1/1    11.  
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Chem midterm 1 - 1.

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