Module 7—Investigating the Nature of the Atom
Graphing Question Scoring Guide
(5 marks)
Check before you submit your work:
Did you put a title on the graph?
Did you label each axis with an appropriate title including units?
Are the axis scales appropriate to the size of the graph?
Is the equation shown?
Did you calculate the area and paraphrase the answer with the correct significant digits and appropriate units?
Scoring Guides for Graphing Skill-Based Questions––Mathematical Treatment
Score |
Description |
| 5 |
- All formulas are present.
- All substitutions are given and are consistent with the graphed data.
- The relationship between the slope, area, or intercept, and the appropriate physics is explicitly communicated.
- The final answer is stated with appropriate significant digits and with appropriate units. Unit analysis is explicitly provided, if required.
Note: one minor error may be present.* |
| 4 |
- The response contains implicit treatment.**
or
- The response contains explicit treatment with up to three minor errors or one major error.***
|
3 |
- The response is incomplete but contains some valid progress toward answering the question; i.e., coordinates of relevant points are read correctly, including powers of 10 and units, and a valid substitution is shown.
|
2 |
- The coordinates of one relevant point are read.
- The reason for requiring a point is addressed or implied.
|
| 1 |
- A valid start is present.
|
0 |
- Nothing appropriate to the mathematical treatment required is present.
|
*Minor errors include:
- Misreading a data value while interpolating or extrapolating up to one-half grid off.
- Stating the final answer with incorrect (but not disrespectful) units.
- Stating the final answer with incorrect (but not disrespectful) significant digits.
- Missing one of several different formulas.
**Implicit treatment means:
- Substituting appropriate values into a formula from the data sheets without stating the formula.
- Starting with memorized, derived formulas not given on the equations sheet.
- Substituting the value from one calculation into a second formula without communicating that the physics quantity in the two formulas is the same.
***Major errors include:
- Using off-line points (most often, this is calculating the slope using data points that are not on a linear line of best fit).
- Using a single data point ratio as the slope.
- Missing powers of 10 in interpolating or extrapolating.