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12 Cards in this Set

  • Front
  • Back
State the 3 laws that support the existence of atoms.
1) law of definite proportions

2) law of conservation of mass

3) law of multiple proportions
Experimental results supporting the existence of atoms indicated that?
All chemical compounds share certain characteristics.
a pure substance composed of atoms of two or more elements that are chemically combined.
law of definite proportions
a chemical compound always contains the same elements in exactly the same proportions by weight or mass
law of conservation of mass
mass cannot be created or destroyed in ordinary chemical and physical changes
law of multiple proportions
when two elements combine to form two or more compounds, the mass of one element that combines with a given mass of the other is in the ratio of small whole numbers
Dalton's Atomic Theory
1) All matter is composed of extremely small particles called ATOMS, which cannot be subdivided, created, or destroyed.
Dalton's Atomic Theory (2)
2) Atoms of a given element are identical in their physical and chemical properties.
Dalton's Atomic Theory (3)
3) Atoms of different elements differ in their physical and chemical properties.
Dalton's Atomic Theory (4)
Atoms of different elements combine in simple, whole-number ratios to form compounds.
Dalton's Atomic Theory (5)
5) In chemical reactions, atoms are combined, separated, or rearranged, but never created, destroyed, or changed.
Dalton versus what we know today
1) Data gathered since Dalton's time shows that the first two principles are not true in all cases.

2) Scientists can now: divide an atom into even smaller particles, destroy atoms, and create atoms.

3) Dalton didn't know that many atoms will combine with like atoms (O2).