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exam-1-2015

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Sodium oxide reacts with water to produce sodium hydroxide. Suppose 11.1 g of sodium oxide is combined with 38.7 g of water. When the reaction is complete, all the sodium oxide has been consumed. According to the law of conservation of mass which is a true statement?

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The term that is related to the reproducibility (repeatabilitiy) of a measurement is

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What is the best answer to report for ((4.416 g + 7.656 g)/4.79 mL) + 0.380g/mL ?

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A thin sheet of iridium metal that 3.12 cm by 5.21 cm has a mass of 87.2 g and a thickness 2.360 mm. What is the density of iridium?

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Who discovered the electron?

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The nucleus of a 191 Ir nuclide contains

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Naturally occurring element X exsists in three isotopic forms: X-28 (27.979 amu, 92.21% abundance), X-29 (28.976 amu, 4.70% abundance), and X-30 (29.974 amu, 3.09% abundance). Calculate the atomic weight of X.

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A sample of TNT, C7H5N3O6, has 8.94*10^21 nitrogen atoms. How many hydrogen atoms are there in this sample of TNT?

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Which of the following statements is false?

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