 It is the steps someone takes to identify a question, develop a hypothesis, design and carry out steps or procedures to test the hypothesis, and document observations and findings to share with someone else.

The question leads one to… gather information (you find s Thomson’s Plum Pudding Model for atomic structure- there are electrons embedded in a sea of positive charge) and form a hypothesis ( If Thomson's Plum Pudding model was to be accurate, then big alpha particles will pass through the gold foil with only a few minor deflections because alpha particles are heavy and the charge in the "plum pudding model" is widely spread.)

 Finally you gather information based on your experiment, analyze the data to determine what your experiment showed you about the phenomena you questioned, and come up with a conclusion based on it. Was your hypothesis correct? Incorrect? Why? What other questions does it leave you with?

 Observations lead to Questions  Background Research-what do we already know  Hypothesis- what do we expect will occur  Conduct Experiment- Procedures/Method  Collect and Analyze Results/Table/stats/graphs  Conclusion

 IS SCIENCE OBJECTIVE OR SUBJECTIVE???

 …ON HOW CLOSE WE LOOK… CONCLUSIONS ARE NEVER OBJECTIVE…ALWAYS SUBJECTIVE

 WHY SI??? To be on the same page…comparing apples to apples (meters to meters, liters to liters)…KING HENRY!

 Base Units – independent of other units  Derived Units – combination of base units Examples  density  g/L (grams per liter)  volume  m x m x m = meters cubed

 ACCURACY – how close a measured value is to the accepted value  PRECISION – how close measurements are to one another - if measurements are precise they show little variation * Precise measurements may not be accurate

Precision- refers to how close a series of measurements are to one another; precise measurements show little variation over a series of trials but may not be accurate. LESS THAN.1 IS PRECISE Oscar performs an experiment to determine the density of an unknown sample of metal. He performs the experiment three times: 19.30g/ml 19.31g/ml 19.30g/ml Certainty is +/-.01 Are his results precise?

 Accuracy – refers to how close a measured value is to an (theoretical) accepted value.  The metal sample was gold( which has a density of 19.32g/ml)  Certainty is +/-.01  Are his results accurate? Need to calculate percent error.  5% OR LESS IS ACCURATE  Oscar finds the volume of a box 2.00cm3 (ml)  It is really 3.00ml is it precise? Accurate? Percent error

 PROPERTIES AND CHANGES  CLASSIFICATION OF MATTER