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17 Cards in this Set
- Front
- Back
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independent variable |
is causing the change in the dependent variable |
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dependent variable |
what is being changed/being tested & measured in a scientific experiment |
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hypthosis |
tentative answer to a question; proposed explanation for a set of observations; leads to predications that can be tested by experiments |
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theory |
observation supported by abundant evidence |
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law |
statement based on facts & has been proven |
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experimental group |
group that receives the variable being tested |
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control group |
does not receive the variable being tested (think placebo) |
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ionic bonding |
attraction between oppositely charged ions (transfer of electrons) |
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covalent bonding |
2 atoms share 1 or more pairs of electrons; the strongest type of bonding |
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hydrogen bonding |
a type of weak chemical bond formed when a partially positive hydrogen atom from one polar molecule is attracted to the partially negative atom in another molecule |
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polar |
molecule with an uneven distribution of charge that creates 2 poles: 1 positive & 1 negative |
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nonpolar |
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cohesion |
tendency of molecules of the same kind to stick together |
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adhesion |
the attraction between different kinds of molecules |
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acid |
chemical compound that releases hydrogen ions (H+) into a solution |
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base |
compound that accepts hydrogen ions (H+) & removes them from a solution; aka alkali |
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buffer |
substances that minimize changes in pH by accepting H+ when the ion is in excess & donating H+ when it is depleted |
