Chemistry
Chemical symbols and formula
A) Know the difference between the atoms, ions
and molecules:
Atoms: the
uncharged particles that are the building blocks of elements. Comprises of
protons and neutrons in the nucleus orbited by electrons
Ions: A
positively or negatively charged atom or covalently bonded group of atoms (a
molecular ion)
Molecule: The smallest part of a specific chemical
compound, made up of covalently bonded atoms.
B) Write formula for common ions and molecules
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C) Be able to use standard form
-A way of writing very large or very small numbers. When two
numbers have the same power of ten they become easier to compare.
-e.g
- 13000
= 1.3x10
-
26.3x10⁴ = 2.63⁵
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