Summary OCR Chemistry A - 2.1 Atoms, Ions and Compounds Revision Booklet

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A Level Chemistry
Module 2: Foundations in Chemistry

Topic 1: Atoms, Ions &
Compounds


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Chemistry Department June 2020

,Module 2 – Foundations in Chemistry 1 Laura Stanley Adam Davis
Topic 1 – Atoms, Ions & Compounds Amanda Dibbo Matt Cannon




Contents

1. Atomic Structure and Isotopes ............................................................................. 2
What are isotopes? (2.1.1a) ............................................................................ 2
Atomic structure of ions (2.1.1b) ..................................................................... 3
2. Relative Masses (2.1.1c) ..................................................................................... 5
Finding the relative masses of the elements ................................................... 5
What is Relative isotopic mass? ..................................................................... 5
What is Relative atomic mass, Ar? .................................................................. 5
Mass Spectrometry (2.1.1d) ............................................................................ 5
How to Calculate Relative Atomic Mass, Ar (2.1.1d) ....................................... 5
Relative molecular mass (Mr) vs. Relative formula mass (2.1.1e)................... 5
3. Formulae & Equations ......................................................................................... 9
Simple ions from the periodic table (2.1.2ai) ................................................... 9
Binary compounds .......................................................................................... 9
Polyatomic ions (2.1.2aii) ................................................................................ 9
Writing formulae of ionic compounds from ions .............................................. 9
Writing equations (2.1.2b) ............................................................................. 10
Balancing equations (2.1.2b) ........................................................................ 10
4. Specification ...................................................................................................... 12
5. Practice Questions............................................................................................. 13
6. Past Paper Questions Index ……………………………………………………….. 14
7. Past Paper Questions ………………………………………………………………. 15

, Module 2 – Foundations in Chemistry 2 Laura Stanley Adam Davis
Topic 1 – Atoms, Ions & Compounds Amanda Dibbo Matt Cannon



1. Atomic Structure and Isotopes


 Can you remember back to the structure of the atom and
the sub atomic particles?
Think
 Can you remember what an ion is and how it is different to
an atom?




RELATIVE RELATIVE
Particle Abbreviation
MASS CHARGE
PROTON

NEUTRON

ELECTRON



What are isotopes? (2.1.1a)

Isotopes are



The word isotope is used for different atoms of the same element that occupy the
same position in the Periodic table. We can describe an isotope using two numbers:

 Atomic Number =

 Mass Number =

These numbers are written on the symbol of the isotope.


Using your data sheet, complete this
diagram with the correct position of the
Mass number, A (protons + neutrons),
and Atomic number, Z (protons).