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Redesign AP chemistry exam Subsequent slides are excerpts from AP chemistry workshop Effective 2013 – 2014 academic year Some 2013 – 2014 AP chemistry.

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Presentation on theme: "Redesign AP chemistry exam Subsequent slides are excerpts from AP chemistry workshop Effective 2013 – 2014 academic year Some 2013 – 2014 AP chemistry."— Presentation transcript:

1 Redesign AP chemistry exam Subsequent slides are excerpts from AP chemistry workshop Effective 2013 – 2014 academic year Some 2013 – 2014 AP chemistry study guides may be inaccurate, i.e. do not reflect these changes If you are using any AP chemistry study guides prior to 2013, some content do not reflect the redesigned AP chemistry exam

2 Reducing Breadth of the AP ® Chemistry Course: Concepts no longer tested in revised course: Memorization of the exceptions in electron configuration of atoms and solubility rules Assigning quantum numbers Writing nuclear reactions Deriving the Henderson-Hasselbalch equation Computations of solubility as a function of pH Memorizing specific types of crystal structures Using standard enthalpies of formation to calculate the overall energy change in a reaction Lewis Acid-Base Theory Student memorization of ubiquitous factoids out of the context of application is no longer a part of the AP ® Chemistry curriculum framework. Instead, the AP ® Chemistry framework focuses on increasing students’ depth of understanding of enduring principles for the purpose of application of skills to solve non- routine problems.

3 AP ® Chemistry New Exam Design: Assessing the Learning Objectives

4 Particulate View Multiple Choice The structures and normal boiling points of dimethyl ether and ethanol are given in the table above. Which of the following diagrams best helps to explain the difference in boiling point of the two compounds? Compound Molecular Structure Normal Boiling Point Dimethyl ether250 K Ethanol351 K E X A M P L E

5 Real-World Application Multiple Choice Of the following metals, which would be the most appropriate choice for lining the inside of a railroad tank car used for transporting 1.0 M hydrochloric acid? MetalHalf-ReactionEºEº a)AlAl 3+ + 3 e –  Al–1.66 V b)CdCd 2+ +2 e –  Cd–0.40 V c)CuCu 2+ + 2 e –  Cu0.34 V d)ZnZn 2+ + 2 e –  Zn–0.76 V E X A M P L E

6  Types of Free-Response Questions:  Lab I: Engaging in experimental design  Lab II: Selection and analysis of authentic data/observations to identify patterns or explain phenomena  Representations I: Translation between representations  Representations II: Creating or analyzing atomic/molecular views to explain observations  Quantitative: Following a logical/analytical pathway to solve a problem Free-Response Section of the Exam

7 Short Part/Representation II Free Response Shown below are three models that can be used to represent a molecule of ammonia. Select one of the models. Indicate clearly which model you selected, and describe: a)one aspect of the ammonia molecule that the model represents accurately/well, and … b)one aspect of the ammonia molecule that the model does not represent accurately/well. E X A M P L E

8 Multipart/Lab I (Experimental design) Free Response Design an experiment to collect data that supports the claim that a 1.0 M NaCl solution is a homogeneous mixture. Describe the steps, the data you would collect, and how the data support the claim. Laboratory equipment for your experiment should be taken from the list below. (You may not need all of the equipment.) 50-mL beakersDrying oven Volumetric pipets (5 mL, 10 mL and 25 mL)Hot plate Stirring rodBalance 100 mL of 1.0 M NaCl(aq)Fume hood E X A M P L E

9 Multipart/Quantitative Free Response The following diagram shows the change in concentration of the reactant A and product AB 2 for the reaction represented by the equation above. The species A, B, and AB 2 are gases. A + 2 B  AB 2 a)Indicate on the diagram where the reaction reaches equilibrium. b)At time t, what is the relationship between Q (the reaction quotient), and K (the equilibrium constant)? c)At equilibrium, what is the relationship between the rate of decomposition of AB 2 and the rate of consumption of B for the reaction? d)For the same reaction at a different temperature, 6 moles of A and 9 moles of B are combined in a rigid 1.0 L container, and the system reaches equilibrium. If there are 3 moles of AB 2 present at equilibrium, what is the value of K for the reaction at this temperature? E X A M P L E

10 Label 45° 0° 90° AP Multiple Choice Questions

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12 Identifying Differences between Legacy and Redesigned Questions Legacy Exam Questions that test simple recall and memorization Questions that start with “which of the following is not” Questions whose answers include (A) I only, (B) II only, etc. Redesigned Exam Each question will address content and science practices within one or two learning objectives Each question will have four options, not five New exam will have question sets New exam will provide normally memorized data in the stem if its needed New exam will contain more particulate views of chemical reactions

13 What’s Out: Content Wise

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17 What’s Out: Question Type

18 What’s Out: Content & Question Type Correct statements about alpha particles include which of the following? I. They have a mass number of 4 and a charge of +2. II. They are more penetrating than beta particles. III. They are helium nuclei. (A)I only (B)III only (C)I and II (D) I and III (E) II and III

19 What’s In: Particulate View

20 What’s In: Assessing Deeply Using Question Sets

21 What’s In: Providing Needed Data in the Stimulus

22 Which of the following best describes the principal type of solute-solvent interaction in each of above solutions ranked in order from strongest to weakest solute-solvent interaction. KCl dissolved in water CH 2 Cl 2 dissolved in benzene Ethanol dissolved in water

23 Build the Key/Distractors 23 KCl in WaterIon to dipole interaction Ethanol in WaterHydrogen Bonds CH 2 Cl 2 in BenzeneLondon Dispersion Forces KCl in WaterDipole to dipole interactions Ethanol in WaterHydrogen Bonds CH 2 Cl 2 in BenzeneNo solute to solvent interactions KCl in WaterIon to dipole interaction CH 2 Cl 2 in BenzeneLondon Dispersion Forces Ethanol in WaterHydrogen Bonds CH 2 Cl 2 in BenzeneLondon Dispersion Forces Ethanol in WaterLondon Dispersion Forces KCl in WaterLondon Dispersion Forces (A) (B) (C) (D)


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