AP CHEMISTRY 2011 SCORING GUIDELINES Question 1

the thermal energy of the sample decreases. As the products are made, energy is transferred as work by moving the piston or as heat to the product gas molecules and container

Point 4 was earned when the student explains chunking as “cluster[ing] objects (or in Savannah’s case, words) into meaninful [sic] units.” Point 5 was granted when the student

The moving averages reduce variability, making more apparent the overall decreasing trend in number of typhoons in the Western Pacific Ocean and the slight increasing trend in

computations nor explanations were necessary for the response to part (c) to be scored as essentially correct, it is a strength of this response that the student shows the

In part (b) the student indicates that the “advantage to this [the stratified sample] would be to see if kids play a big role in the carpets [sic] wear,” as opposed to the cluster

More specific goals were to assess students’ ability to: (1) state hypotheses; (2) identify the name of an appropriate statistical test and check appropriate

The primary goals of this question were to assess students’ ability to (1) determine the equation of the least squares regression line from a computer output; (2) use the slope of

In section 1 the student correctly checks the randomness condition (“random sample stated”), checks the large sample size condition with numerical evidence, and identifies the