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Atomic mass: Quiz


Question 1: One can compute the molar mass of a compound by adding the relative atomic masses of the elements given in the ________.
HydrogenChemical formulaCarbonChemistry

Question 2: This corresponds to the following: nuclear fission in an element heavier than ________ produces energy, and fission in any element lighter than iron requires energy.

Question 3: For example, the standard atomic weight of ________ is 55.847 g/mol, and therefore one mole of iron as commonly found on earth has a mass of 55.847 grams.

Question 4: The atomic mass (ma) is the ________ of an atom, most often expressed in unified atomic mass units.
Classical mechanicsForceGeneral relativityMass

Question 5: [1] The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single ________ (when the atom is motionless).

Question 6: The chemists used a scale such that the natural mixture of ________ isotopes had an atomic mass 16, while the physicists assigned the same number 16 to the atomic mass of the most common oxygen isotope (containing eight protons and eight neutrons).

Question 7: However, because oxygen-17 and oxygen-18 are also present in natural ________ this led to 2 different tables of atomic mass.

Question 8: Relative atomic mass is a synonym for ________ and closely related to average atomic mass (but not a synonym for atomic mass), the weighted mean of the atomic masses of all the atoms of a chemical element found in a particular sample, weighted by isotopic abundance.
Atomic weightFluorineBoronAvogadro constant

Question 9: The atomic mass is defined as the mass of an atom, which can only be one ________ at a time and is not an abundance-weighted average.
Stable nuclideNeutronTechnetiumIsotope

Question 10: Standard atomic weight refers to the mean relative atomic mass of an element in the local environment of the Earth's crust and atmosphere as determined by the ________ Commission on Atomic Weights and Isotopic Abundances.
CarbonPotassiumInternational Union of Pure and Applied ChemistryIUPAC nomenclature

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