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Administering Nitrous Oxide

One of the tanks that a pediatric dentist uses to administer nitrous oxide is “empty”, meaning that the N2O inside is at the same temperature and pressure as the room. The ML-6 type cylinder has an internal volume of 165 liters. How many moles of nitrous oxide remain in the empty tank (Ideal gas constant = 0.082 L atm/K mol; assume the apparatus is at sea level; the ambient temperature is 22° C)?

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Photo attributed to Jurvetson.

Mg and Ar

In a reaction between Mg and Ar, which of the following is most likely to occur?

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Endothermic Chemical Reaction

Which of the following is at the highest energy during an endothermic chemical reaction?

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Valence Electron Configuration

Which of the following elements would contain the valence electron configuration 4s24p5?

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Boiling Point of Mixtures

Mixture A is formed using KCl and H2O and mixture B is formed using MgCl2 and H2O. If the two mixtures have the same molality, which of the following statements would be true about the boiling point of the mixtures?

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Dissolve In Water

Which of the following will not dissolve in water?

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The Molecular Formula

If an unknown compound is found to have an empirical formula of CH4, which of the following is the molecular formula if the molar mass was determined to be 128 g/mol?

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Final Oxidation Number

What is the final oxidation number of carbon in the following chemical reaction?

6CO2 + 6H2O -> C6H12O6 + 6O2

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Compound Boiling Point

Which of the following compounds would have the highest boiling point?

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Evaporative Cooling

Which of the following is an accurate explanation for evaporative cooling?

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