Relative Mass (OCR A-Level Chemistry A): Quizzes

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Relative mass
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What is the mass of one carbon-12 atom defined as?

Exactly 12 atomic mass units

Which particles contribute almost all of an atom's mass?

Protons and neutrons in the nucleus

What is relative isotopic mass compared to?

112\frac{1}{12} of carbon-12 atom mass

What type of average is relative atomic mass (ArA_r)?

Weighted mean of all isotopes

How do heavier ions behave in a mass spectrometer?

Move slower and harder to deflect

For a single positive charge ion, what does m/zm/z equal?

Relative isotopic mass

Chlorine has 75.78% 35^{35}Cl and 24.22% 37^{37}Cl. What is its ArA_r?

35.5

Why are relative isotopic mass and ArA_r dimensionless?

They are ratios of two masses

What does peak height represent in a mass spectrum?

Percentage abundance of isotope

How is one atomic mass unit (uu) defined?

112\frac{1}{12} of carbon-12 atom mass

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