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32 Cards in this Set
- Front
- Back
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two repeated confirmation of a hypothesis |
a theory/ model |
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observations during an experiment are called |
data |
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a answers the question WHY |
theory |
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a answers the question WHAT |
law |
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what are the symbols for a halogen |
H, F, Cl, Br, I, Al |
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what are the symbols for alkali metals |
H, Li, Na, K, Rb, Cs, Fr |
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what are the symbols for alkali earth metals |
Be, Mg, Ca, Sr, Ba, Ra |
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element |
the simplest form of matter that cant be broken down any further |
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compound |
two or more SEPARATE elements; a mixture |
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homogeneous mixture |
a mixture that is the same through out the mixture |
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heterogeneous mixture |
a mixture that is different throughout the mixture and not the same |
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wood is a |
heterogeneous mix |
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baking soda is a |
compound |
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helium is a |
element |
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sterling silver is a |
homogeneous mix |
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one conclusion to Rutherford's experiments |
nuclear atom must have a positive charge to balance the negative charge |
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one conclusion to Rutherford's experiments |
nucleus must be small and dense |
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one conclusion to Rutherford's experiments |
atoms contain protons |
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one conclusion to Rutherford's experiments |
nucleolus has a neutron that has a positive charge |
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one conclusion to Rutherford's experiments |
atoms are mostly space |
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why do metal form positive ions |
because they lose electrons |
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why do non metals form negative ions? |
because they gain electrons |
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who discovered the electron |
J J Thompson |
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what device was used to discover the electron |
the cathode ray |
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steps in the scientific method |
make observations formulate a hypothesis test hypothesis results from experimentation |
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methods of filtering a liquid |
distillation, filtration chromatography |
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the fundamental unit of an element is |
an atom |
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neutron discovered by |
james chadwick |
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isotope symbols: A |
mass number (p+n) |
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isotope symbols:Z |
atomic number(=number of p and = to number of e) |
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metal qualities |
conduct heat and electricty, can be bent, ductile, and lusterous |
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ions are |
atoms that possess a charge |
