Section A: Principles of Chemistry Notes

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Notes on questions I got wrong:

  • The manufacture of poly(ethene) from ethene:

- poly(ethene) is the starting state and is a gas

- ethene is the finishing state and is a solid

  • Isotope definition:- must use the word ATOM 

a) Atoms that have the same number of protons but differnet number of neutrons

b) Atoms with the same atomic number but different mass numbers or atoms of the same element with different masses.

  • To find Relative formula mass:

RAM = (Percent. of isotope 1 x mass no.) + (Percent. of isotope 2 x mass no.) etc / 100 Give to 1 decimal place

  • Why do different isotopes of the same element have the same chemical…

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