12012019
Description
Quiz by yau jia wen, updated more than 1 year ago
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Created by yau jia wen
about 7 years ago
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Question 1
Question
The relative molecular mass of NO2 is 46. This means that
Answer
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NO2 is 46 times heavier than the mass of carbon-12
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NO2 is 46/12 times heavier than 1 atom of carbon-12
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NO2 is equal to 1/12 of the mass of 1 atom of carbon-12
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NO2 is 46 times heavier than 1/12 x 12 of carbon-12
Question 2
Question
Find out how many times three chromium atoms are heavier than 4 oxygen atoms. [Cr = 52; O=16]
Answer
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3.25
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2.4
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16
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52
Question 3
Question
the percentage content of iodine in lead(||) iodide. PbI2 is [Pb = 207; I= 127]
Answer
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55%
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27.5%
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38%
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76%
Question 4
Question
Calculate the percentage mass by weight of metal M in the compound MCl4. [RAM: M=207, Cl= 35.5]
Answer
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16.2%
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14.6%
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40.7%
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59.3%
Question 5
Question
Three elements are represented by letters X, Y, and Z. One atom of Z is three times heavier than one atomof Y. One atom of Y is 2 times heavier than one atom of X. If the RAM of Z is 210, what is the RAM of X?
Answer
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24
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31
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35
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60
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