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Atomic mass unit: Quiz


Question 1: (The reason is that a 12C atom contains 6 protons, 6 neutrons and 6 electrons, with the protons and neutrons having about the same mass and the ________ mass being negligible in comparison.

Question 2: Both units are slightly smaller than the unified atomic mass unit, which was adopted by the International Union of Pure and Applied Physics in 1960 and by the ________ in 1961.
International Union of Pure and Applied ChemistryPotassiumIUPAC nomenclatureCarbon

Question 3: Because proteins are large ________, their masses are often in kilodaltons, where one kilodalton is 1000 daltons.

Question 4: The unified atomic mass unit or atomic mass unit (u), or dalton (Da) or, sometimes, universal mass unit (u), is a unit of ________ used to express atomic and molecular masses.
ForceMassClassical mechanicsGeneral relativity

Question 5: The chemist ________ was the first to suggest the mass of one atom of hydrogen as the atomic mass unit.
John DaltonAtomic theoryMarie CurieSir George Stokes, 1st Baronet

Question 6: The unified atomic mass unit, or dalton, is not an ________ (SI) unit of mass, but it is accepted for use with SI under either name.
Systems of measurementMetric systemInternational System of UnitsConversion of units

Question 7: For example, the molecular mass of a ________ containing one 16O atom and two 1H atoms is 18.0106 u, and this means that one mole of this monoisotopic water has a mass of 18.0106 g.
OxygenProperties of waterHydrogenChlorine

Question 8: For this reason these sorts of comparisons are more meaningful and practical using ________ which are generally expressed in g/mol, not u.
HydrogenMolar massAtomic massAtom

Question 9: The unit is convenient because one hydrogen atom has a mass of approximately 1 u, and more generally an ________ or molecule that contains n protons and neutrons will have a mass approximately equal to n u.

Question 10: The mass of the electron is approximately 1/1836 of the mass of the proton.) This is an approximation, since it does not account for the mass contained in the ________ of an atom's nucleus; this binding energy mass is not a fixed fraction of an atom's total mass.
HydrogenPlutoniumNuclear fusionBinding energy


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