OCR A Level Chemistry A – Module 2 Foundations in Chemistry

2.1.1
Atomic Structure and Isotopes

Section 2.1.1 covers the structure of the atom, isotopes, relative isotopic, atomic, molecular and formula mass, and how mass spectrometry gives relative isotopic masses and abundances. These pages cover atomic structure and isotopes and the four mass spectrometry pages; relative molecular and formula mass are used throughout 2.1.3 Amount of Substance.

Exam Paper

Paper 1 & 2

H432/01 and H432/02

Specification Points

2.1.1 (a) – (e)

5 learning outcomes

Topic Parts

2 of 2 live

Atomic Structure, Mass Spectrometry

Exam Board

OCR A

H432 (2015 onwards)

Revision Notes

Work through 2.1.1 in a structured sequence.

Particles

Atomic
Structure

Atomic Structure

Protons, neutrons and electrons, atomic and mass number, isotopes and working out particle numbers in atoms and ions (2.1.1 (a), (b)).

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Instrument

Mass
Spectrometry

Mass Spectrometry

How the mass spectrometer works, relative isotopic and atomic mass, RAM from abundances, diatomic spectra and identifying compounds (2.1.1 (c), (d)).

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Specification Coverage

2.1.1 Atomic Structure and Isotopes – OCR A Level Chemistry A

The following OCR A learning outcomes state what candidates should be able to do. Wording is taken from the OCR A Level Chemistry A (H432) specification.

2.1.1 Atomic Structure and Isotopes

2.1.1(a)

Isotopes

isotopes as atoms of the same element with different numbers of neutrons

isotopes as atoms of the same element with different masses

2.1.1(b)

Atomic structure of atoms and ions

atomic structure in terms of the number of protons for atoms, given the atomic number and mass number

atomic structure in terms of the number of neutrons for atoms, given the atomic number and mass number

iii

atomic structure in terms of the number of electrons for atoms, given the atomic number and mass number

atomic structure in terms of the number of protons for ions, given the atomic number, mass number and ionic charge

atomic structure in terms of the number of neutrons for ions, given the atomic number, mass number and ionic charge

atomic structure in terms of the number of electrons for ions, given the atomic number, mass number and ionic charge

2.1.1(c)

Relative isotopic and relative atomic mass

explanation of the term relative isotopic mass (mass compared with 1/12th mass of carbon-12), based on the mass of a 12C atom, the standard for atomic masses

explanation of the term relative atomic mass (weighted mean mass compared with 1/12th mass of carbon-12), based on the mass of a 12C atom, the standard for atomic masses

2.1.1(d)

Mass spectrometry

i)-a

use of mass spectrometry in the determination of relative isotopic masses

i)-b

use of mass spectrometry in the determination of relative abundances of the isotopes

use of mass spectrometry in the calculation of the relative atomic mass of an element from the relative abundances of its isotopes

2.1.1(e)

Relative molecular and formula mass

use of the term relative molecular mass, Mr

use of the term relative formula mass

iii

calculation of relative molecular mass from relative atomic masses

calculation of relative formula mass from relative atomic masses

2.1.1Atomic Structure and Isotopes

Revision Notes

2.1.1 Atomic Structure and Isotopes – OCR A Level Chemistry A

2.1.1 Atomic Structure and Isotopes

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2.1.1
Atomic Structure and Isotopes