ACS Organic Exam: The Details.

[Pages:2]ORGANIC CHEMISTRY CHEM 12B (L1/L1L)

FALL 2017

LANEY COLLEGE INSTRUCTOR: STEPHEN CORLETT

ACS Organic Exam: The Details.

The ACS organic exam will be given on Thursday, December 7th 2017 at 10:00-11:50 am in A 277. Arrive at 9:45 so that you have time to fill in some forms and so we can get started right on time. Everything that you need for the exam will be provided, including pencils.

No notes, calculators, models or tables are allowed in the testing area! Everything that you will need is provided.

How will the standardized ACS exam be figured into my course grade?

Your percent score will be based on national percentile ranking. A score at the 50th percentile is, by definition, average. Therefore the percentile score must be scaled to reflect grading on a 100-point scale and be consistent with the grade cutoffs listed in the course syllabus.

The class average in organic chemistry is usually 75/100. Therefore, a student scoring at the 50th percentile on the ACS exam should receive a grade of approximately 75%. This scaling will be accomplished by using the following formula:

Scaled Score = ACS percentile + [ (100-ACS percentile) (ACS percentile/100) ]

Using the example given above, for a student score at the 50th percentile on the final, we get:

50 + [(100 - 50) (50/100) ] = 75%

To see how this works, the following ACS percentile conversions were calculated using the formula given above: 90 percentile => 99 % 80 percentile => 96 % 70 percentile => 91 % 60 percentile => 84 % 50 percentile => 75 % 40 percentile => 64 % 30 percentile => 51 % 20 percentile => 36 % 10 percentile => 19 %

ORGANIC CHEMISTRY CHEM 12B (L1/L1L)

FALL 2017

LANEY COLLEGE INSTRUCTOR: STEPHEN CORLETT

This is data from the American Chemical Society Exams Institute for the version of the exam that you will be taking. (from: ). (The data periodically change slightly as more schools submit their exam scores to the Exams Institute.)

Score 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47

American Chemical Society Division of Chemical Education

Composite Norms

Organic Chemistry Form 2012

Percentile 100 100 100 100 100 100 100 99 99 98 98 97 96 95 95 94 92 91 90 88 87 85 83 81

Score 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23

Percentile 79 77 74 72 69 66 63 60 58 54 51 48 44 41 37 33 29 25 21 18 15 12 10 8

Score 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Percentile 6 4 3 2 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Mean Std deviation Median KR-21 reliability Std error/meas

39.47 12.16

38.2 0.90 3.91

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