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 the difference between relative atomic mass and relative molecular mass.
Explain how the relative atomic mass of an element is calculated if it has more than one isotope.
Explain why the relative atomic mass of an element is often not a whole number.
What is meant by the term 'relative atomic mass'?
A molecule of nitrogen gas (N2) contains two nitrogen atoms. What is its relative molecular mass? (N = 14)
A sample contains 60% isotope X (mass = 20) and 40% isotope Y (mass = 22). What is the relative atomic mass of the element?
A sample of chlorine contains 75% Cl-35 (relative atomic mass = 35) and 25% Cl-37 (relative atomic mass = 37). Calculate the relative atomic mass of chlorine.
Which of the following best describes the term 'isotope'? (1) Atoms with the same number of protons but different numbers of neutrons. (2) Atoms with different numbers of protons. (3) Atoms with the same mass number. (4) Atoms with different numbers of electrons.
Which of the following best explains why the relative atomic mass of chlorine is not a whole number? (1) It is a mixture of isotopes. (2) It is a mixture of elements. (3) It is a mixture of compounds. (4) It is a mixture of molecules.
Which of the following elements has a relative atomic mass closest to 1? (1) Oxygen (2) Hydrogen (3) Carbon (4) Nitrogen
Which of the following is NOT needed to calculate the relative atomic mass of an element? (1) The mass of each isotope (2) The abundance of each isotope (3) The number of protons in each isotope (4) The mass of a carbon-12 atom
Which of the following is the correct formula for calculating the relative molecular mass of a compound? (1) Add the atomic numbers of all atoms. (2) Add the mass numbers of all atoms. (3) Add the relative atomic masses of all atoms in the molecule. (4) Multiply the atomic masses of all atoms.
Fill in the blank: The relative atomic mass of an element takes into account the ______ of its isotopes.
Fill in the blank: The relative molecular mass of C2H5OH is ______. (C = 12, H = 1, O = 16)
Fill in the blank: The relative molecular mass of glucose (C6H12O6) is ______. (C = 12, H = 1, O = 16)
Fill in the blank: The relative molecular mass of H2SO4 is ______. (H = 1, S = 32, O = 16)
Is the relative atomic mass of an element always the same as its mass number? Yes or No.
The relative atomic mass of chlorine is 35.5. True or False?
True or False: The relative atomic mass of an element can be a decimal number.
True or False: The relative atomic mass of an element can be found on the periodic table.
