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25 Cards in this Set
- Front
- Back
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Matter |
Anything with mass and volume Occupies space May be solid liquid or gas |
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Mixture |
A combination of matter that can be separated
Not a definite composition |
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Pure substance |
Matter that has a definite composition |
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Heterogeneous mixture |
Mechanical Pieces are visible Composition is variable throughout |
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Homogeneous |
Solution Pieces are not identifiable Composition is constant |
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Element |
Substance cannot be chemically broken down into smaller substances |
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Compound |
Two or more elements that are chemically combined and can be separated |
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Physical properties |
Ex colour, density, state of mater, ductility, conductivity, malleability |
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Chemical properties |
Describes how one substance reacts with others Produces new substances with different properties Ex ability to burn burn, reaction with water, acids and bases, flash point |
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Evidence of a chemical change |
New colour Change in temperature Bubbles form Precipitate forms Change is difficult to reverse |
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Thompson |
Plum pudding Positive sphere with negative particles embedded throughout Evidence: existence of charges |
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Rutherford |
Positively charged nucleus containing protons and neutrons (mass of the atom) with negative electrons that orbit randomly Evidence scattering of alpha particles |
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Bohr model |
Positively charged nucleus with negative electrons orbiting in specific energy levels Evidence: appearance of atomic spectra |
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Dimitri Mendeleev |
Catalogued the periodic table |
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Groups |
More of them |
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Periods |
7 |
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Alkali metals |
Group 1 Soft , shiny , silver , highly reactive |
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Alkali earth metals |
Group 2 , shiny , silver , not as soft or reactive |
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Halogens |
Group 17 Poisonous and react with alkali metals to form salts |
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Noble gases |
Group 18 Very stable and unreactive |
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Mass # |
#protons + atomic # |
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Atomic # |
# protons |
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Isotopes have different number of |
Neutrons |
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Neutrons |
Atomic mass - atomic number |
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A reaction that produces a gas |
Will see bubbles |
