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28 Cards in this Set
- Front
- Back
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What is Chemistry? |
Chemsitry is the study of Matter and their interactions/ reactions. |
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Scientific Method |
the first step of the scientific method is to state the problem and collect data (observations) |
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qualitative |
characteristics color, shape, texture, |
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quantative |
numerical (measurements) length, mass, weight, radius, Area, Surface area, volume |
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step 2 |
formulate a hypothesis |
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Hypothesis |
possible explanation of a phenomenon. must be testable.
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step 3 |
conduct experiements |
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control variables |
all variables that are not being investigated that must be controlled (held constant). |
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independent variable
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the variable that scientist changes |
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dependent variable |
the variable that changes with the variable that the scientist changes or the independent variable |
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science and technology |
science- the study of technology technology- application of science |
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Hypothesis, Theory, and Law |
Hypothesis- Testable possible explantation of a phenonomenon. Theory (Model)- Hypothesis that has been tested and not failed Law- statement of what happens |
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Fundamental units |
The basic units of measurements that can make up all other units of measure |
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Fundamental |
Basic |
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length |
meter |
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mass |
kilogram |
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time |
second
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electric charge |
coulomb
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volume |
liter |
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temperature |
degree
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luminosity |
candela |
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Derived units |
they are combinations of the fundamental units. |
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velocity |
m/s |
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acceleration |
m/s^2
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density
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g/mL |
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steps to measure an item |
step one look at the instruments (units, and markings) step two zero step three read the digits that are certain step four estimate to the next lower decimal place step five calculate the uncertainty of the ruler (50% of the smallest marking) |
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Errors in measurements |
Method Error- error in measurement procedures. operator error. instrument error- error that is inherent in the instrument. Either designed or constructed into the instrument |
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measurements |
accuracy closeness to accepted value Percent Error precision degree of exactness (decimal place). |
