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Descriptive Statements:
- Demonstrate knowledge of the three laws of thermodynamics, including their application in chemical systems.
- Demonstrate knowledge of the different forms of energy and the conversion from one form to another.
- Demonstrate knowledge of the difference between heat and temperature.
- Solve problems related to specific heat.
- Apply knowledge of calorimetry to analyze the results of calorimetry experiments.
- Apply knowledge of the use of science and engineering practices in exploring and understanding content related to Objective 0014, such as asking questions and defining problems, developing and using models, planning and safely conducting investigations, analyzing and interpreting data, using mathematics and computational thinking, constructing explanations and designing solutions, engaging in argument from evidence, and communicating and evaluating data and conclusions.
Sample Item:
What mass of ice is melted at 0.0°C0 point 0 degrees Celsius by 1.67 × 105 J1 point 6 7 times 1 0 sup 5 joules of heat?
- 132 g
- 199 g
- 334 g
- 500 g
Correct Response and Explanation (Show Correct ResponseHide Correct Response)
Correct Response: D.
Descriptive Statements:
- Analyze energy changes due to forming or breaking chemical bonds.
- Solve problems related to enthalpy changes during chemical reactions.
- Predict the spontaneity of a given reaction based on the Gibbs energy change and analyze the effect of enthalpy change, entropy change, or temperature on spontaneity.
- Demonstrate an understanding of the relationship between the equilibrium constant and Gibbs energy.
- Interpret potential energy diagrams of chemical reactions.
- Apply knowledge of the use of science and engineering practices in exploring and understanding content related to Objective 0015, such as asking questions and defining problems, developing and using models, planning and safely conducting investigations, analyzing and interpreting data, using mathematics and computational thinking, constructing explanations and designing solutions, engaging in argument from evidence, and communicating and evaluating data and conclusions.
Sample Item:
Use the diagram below to answer the question that follows. Apply knowledge of the energy relationships in chemical bonding and chemical reactions.
A graph is shown with the y-axis labeled “Potential Energy” and the x-axis labeled “Reaction Coordinate.” A line extends horizontally from the y-axis, two-thirds of the distance up from the origin before increasing, leveling off, falling below its initial y-value, and finally becoming horizontal again.
The potential energy diagram shows the progress of a particular reaction. Which of the following statements about the reaction is best supported by the data in the graph?
- It requires a catalyst and is endothermic.
- It needs two activated complexes to go to completion.
- It requires activation energy and is exothermic.
- It spontaneously occurs under the conditions represented.
Correct Response and Explanation (Show Correct ResponseHide Correct Response)
Correct Response: C.
Descriptive Statements:
- Apply knowledge of oxidation-reduction reactions to predict whether a given reaction will occur based on standard reduction potentials.
- Analyze the components (e.g., anode, cathode) and operating principles of voltaic and electrolytic cells.
- Calculate potentials of electrochemical cells.
- Apply knowledge of the use of science and engineering practices in exploring and understanding content related to Objective 0016, such as asking questions and defining problems, developing and using models, planning and safely conducting investigations, analyzing and interpreting data, using mathematics and computational thinking, constructing explanations and designing solutions, engaging in argument from evidence, and communicating and evaluating data and conclusions.
Sample Item:
A reaction between zinc atoms and silver ions occurs in an electrochemical cell. The standard reduction potential at the anode is –0.76 Vminus 0 point 7 6 volts and the standard reduction potential at the cathode is 0.80 V0 point 8 0 volts. What is the standard cell potential for this electrochemical cell?
- –1.6 Vminus 1 point 6 volts
- –0.61 Vminus 0 point 6 1 volts
- 0.040 V0 point 0 4 0 volts
- 1.6 V1 point 6 volts
Correct Response and Explanation (Show Correct ResponseHide Correct Response)
Correct Response: D.