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ATOMS AND MOLECULES - Coggle Diagram
ATOMS AND MOLECULES
Laws
Lavoisier & Joseph Proust
Conservation of mass:
It states that the mass can neither
be created nor be destroyed
Constant Proportions
In chemical substance,
elements always present
in definite proportion by mass
E.g. Mass of hydrogen and oxygen
is always 1:8 in H
2
O
Properties
Element has identical mass
& chemical proportion
Combine in ratios of whole numbers
relative number is constant
Building blocks of matter; neither be
created nor destroyed
Molecules
Two or more atoms chemically bonded
Atoms of same/ different elements from molecules
Ions charged species
+ve
: Cation
-ve
: Anion
Mass
Sum of atomic masses of all atoms
HNO3 = 1+14+ (16x3) = 63
Molecules Symbol
1x23 + 1x35.5 = 58.5u NaCl
Mole Concept
Quantity characterized by number of molecules
