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Atoms and Molecules, Ayaan Lazith IX - B. - Coggle Diagram
Atoms and
Molecules
Laws
Constant Proportions
e. g.
Mass of Hydrogen and Oxygen
is always 1:8 in H₂0.
Proust Law
In chemical substance
elements are always present in definite
proportion by mass.
Lavosier & Joseph Proust
Conservation of mass
states that the mass
can neither be created nor destroyed.
Molecules
• Two or more atoms chemically bonded.
• Atoms of same/different elements form molecules.
Properties
Building blocks of
matter; neither be
created not be destroyed.
Combine in ratios
of whole numbers
relative number is constant.
Element has identical
in mass & chemical
proportion.
Mass
Sum of atomic masses of all atoms
HNO₃ = 1 + 14 + (16x3) = 63
Molecules Symbol
1 x 23 + 1 x 35.5 = 58.5u NaCl
Mole Concept
Quantity characterized
by number of molecules.
Ayaan Lazith
IX - B.