**ALL Classes:**

Measurement / Metric Quest next class- STUDY YOUR NOTES!!!

Dimensional Analysis problems worksheet - show all units and work

**3rd period only!:**Finish Final write up of mass Lab for Tuesday 11/15/2011

**the FD will be on a separate sheet(s) of paper from your rough draft , one for each student.**

**Title:**Just how much Rubber is in a Rubber Stopper?

**Question:**How will the rubber stopper’s actual metric mass compare

*(more, less or same mass)*to the converted mass taken from posted English standard measurements?

**Hypothesis:**The Rubber stopper’s actual mass will be________________ then/as the posted mass.

**Test:**By using a metric balance to determine the actual mass of a Rubber stopper, we can convert ounces to grams for the posted mass and compare to the actual mass found using a scale.

**Materials:**metric balance (triple beam pan balance), rubber stoppers of varying size, (calculator)

**Procedures: Make a diagram!!**

- Convert the posted mass from oz → g using the following formula
__1oz. = 28.3 g__ - Take the mass measurement of the rubber stopper on the metric balance.
- Do this for four different rubber stoppers with different posted masses (each table member should do all parts of the experiment for at least one sinker)
- Subtract the measured mass in grams from the posted mass in grams to determine the
__relative error__. You may disregard any negative numbers9 take an absolute value of your result). - Take the relative error in grams and divide by the converted posted mass, in grams, and multiply by 100 to determine the
__percent error__.

**Data:**

Rubber stopper # | Posted mass Converted (g) | Measured mass (g) | Relative Error | % error |

Observations:

**Analysis:**include your calculations and math work for doing the oz-g conversions, relative and percent error.

Make a Bar graph of actual versus converted mass values of the rubber stoppers used.

**Conclusion:**

*(restate the hypothesis, explain how you answered the question or not and compare numeric results to prove or refute your hypothesis, discuss observations as possible errors and propose a next step and who outside of this science class might care about your results)*

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