Relative Atomic Mass and Relative Molecular Mass
Chemistry ⇒ Atomic Structure and the Periodic Table
Relative Atomic Mass and Relative Molecular Mass starts at 9 and continues till grade 12.
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Describe how mass spectrometry can be used to determine the relative atomic mass of an element.
Describe the main difference between relative molecular mass and relative formula mass.
Explain the difference between relative atomic mass and mass number.
Explain why the relative atomic mass of an element may change if the isotopic composition of the element changes.
A molecule of methane (CH4) contains one carbon atom and four hydrogen atoms. If C = 12.0 and H = 1.0, what is the relative molecular mass of methane?
A molecule of nitrogen gas (N2) contains two nitrogen atoms. If the relative atomic mass of nitrogen is 14.0, what is the relative molecular mass of N2?
A sample of chlorine contains 75% Cl-35 and 25% Cl-37. What is the relative atomic mass of chlorine?
A sample of element X contains 75% isotope X-35 (mass = 35) and 25% isotope X-37 (mass = 37). Calculate the relative atomic mass of X.
Which isotope is used as the standard for defining relative atomic mass? (1) Hydrogen-1 (2) Carbon-12 (3) Oxygen-16 (4) Nitrogen-14
Which of the following best defines relative atomic mass? (1) The mass of an atom compared to the mass of a carbon-12 atom (2) The mass of an atom in grams (3) The number of protons in an atom (4) The mass of an atom compared to hydrogen atom
Which of the following best describes the term 'isotopic abundance'? (1) The number of isotopes of an element (2) The percentage of each isotope present in a natural sample (3) The mass of an isotope (4) The atomic number of an isotope
Which of the following compounds has the highest relative molecular mass? (1) H2O (2) CO2 (3) NH3 (4) CH4
Fill in the blank: The relative atomic mass of an element is usually found on the ________ table.
Fill in the blank: The standard reference for relative atomic mass is the ________ isotope of carbon.
Fill in the blank: The sum of the relative atomic masses of all atoms in a molecule gives the ________ of the molecule.
Relative atomic mass is a ________ quantity because it is an average value based on isotopic abundances.
The relative atomic mass of oxygen is 16.00. Is this value likely to be a whole number for all elements?
True or False: The relative atomic mass of an element can be determined by analyzing a mass spectrum.
True or False: The relative atomic mass of an element can be less than 1.
True or False: The relative atomic mass of an element is always the same as the mass number of its most abundant isotope.
