Relative Mass (VCE SSCE Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why do chemists use relative masses instead of actual masses when working with atoms?
Why do chemists use relative masses instead of actual masses when working with atoms?
Actual masses are too small to measure
What exact value is assigned to carbon-12 as the standard for relative masses?
What exact value is assigned to carbon-12 as the standard for relative masses?
12 units
What is relative isotopic mass?
What is relative isotopic mass?
Mass of isotope compared to carbon-12
Why do isotopes of the same element have different masses?
Why do isotopes of the same element have different masses?
They contain different numbers of neutrons
What is the relative isotopic abundance of Cl in naturally occurring chlorine?
What is the relative isotopic abundance of Cl in naturally occurring chlorine?
75.80%
Who invented the mass spectrometer in 1919?
Who invented the mass spectrometer in 1919?
Francis Aston
What does the number of peaks in a mass spectrum indicate?
What does the number of peaks in a mass spectrum indicate?
Number of isotopes present
What is relative atomic mass ()?
What is relative atomic mass ()?
Weighted average of isotopic masses
For rubidium with , isotopes 84.95 and 86.94, what is the lighter isotope abundance?
For rubidium with , isotopes 84.95 and 86.94, what is the lighter isotope abundance?
73.87%
When calculating relative atomic mass, how many sig figs should your answer have?
When calculating relative atomic mass, how many sig figs should your answer have?
Same as least accurate value used