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Lacilouwho
on FreezingBlue Flashcards.
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Chemical Reaction
How different substances combine with each other to make new ones
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Law of Conservation of Mass
Mass is neither created nor destroyed during ordinary chemistry reaction or physical changes
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Law of Definite Properties
A chemical compund contains the same elements in exactly the same proportions by mass regardless of the sample or source of the compound
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Law of Multiple Proportions
If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the 1st element is always a ratio of small whole numbers
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Dalton's atomic theory
- 1. All matter is made of atoms
- 2. Atoms of an elemennt are identical in size, mass, and physical properties, but atoms of different elements differ
- 3. Atoms cannot be subdivided, created, or destroyed
- 4. Atoms of different elements combine in simple whole numbers ratios to form chemical compounds
- 5. In chemical reactions, atoms are combinded, seperated, or rearranged
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What two parts of Dalton's theory have changed?
- 2. (Atoms of an element are identical in size, mass, and physical properties, but atoms of different elements differ)- atoms are divisable into even smaller particals
- 3. (Atoms cannot be subdivided, created, or destroyed)- A given element can have atoms with different masses
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Atom
Smallest partical of an element
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Nucleus
Small region at the center of an atom
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Proton
Positively charged partical
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Electrons
Negatice charge surrounding nucleus
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Subatomic particles
Protons, neutrons, ands electrons
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Most of the Atom's mass is made of
protons and neutrons
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atomic # =
# of protons = # of electrons
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Isotopes
Atoms of the same element have different masses (different # of neutrons)
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Mass # =
# of protons = # of neutrons
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Relative atomic mass
based on mass of carbon
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