AP Chemistry Exam

Referring to the image above, what changes occur when the cell is in operation? (Hint: Cu is a noble metal and is below hydrogen on the activity series. Write a reaction.)

• Anode: [H₃O⁺] increases Cathode: electrode increases in mass

• Anode: [H₃O⁺] increases Cathode: electrode decreases in mass

• Anode: [H₃O⁺] decreases Cathode: electrode increases in mass

• Anode: [H₃O⁺] decreases Cathode: electrode decreases in mass

• Anode: [H₃O⁺] remains constant Cathode: electrode increases in mass

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3

In which of the following situations will a reaction be observed after 10 minutes? (Hint: create your own activity series from the reduction potentials.)

• A silver strip is placed in 1 M Pb(NO3)2.

• A lead strip is placed in 1 M Mg(NO3)2

• A zinc strip is placed in 1 M Mg(NO3)2

• A magnesium strip is placed in 1 M Zn(NO3)2

• A lead strip is placed in a 1 M Zn(NO3)2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Respective standard reduction potentials (in V) for Pb2+ and Ni2+ are -0.13 and -0.28. Which substance will be oxidized in the voltaic cell?

• Pb²⁺

• Pb

• Ni²⁺

• Ni

Given the following information, which of the statements is true:

• H⁺ is incapable of being oxidized or reduced

• Sn²⁺ is the weakest oxidizing agent

• Ni_(s) is the strongest oxidizing agent

• Li_(s) is the strongest reducing agent

• Li⁺_(aq) is the strongest reducing agent

Tags

NGSS.HS-PS1-2

Find the standard reduction potential for the reaction: In⁺³ + 3e- → In

• 0.34 V

• –0.34 V

• 1.02 V

• –1.02 V

• 0.00 V

A voltaic cell consists of a combination of a standard silver electrode and standard hydrogen electrode as shown in the image above. E° = Ag⁺/Ag = 0.80 V. Which of the following is FALSE?

• The overall cell potential depends on the difference in concentration between the two solutions.

• Hydrogen ion is being reduced.

• The overall cell potential is positive so the cell works.

• Hydrogen gas is being oxidized.

• The pH in the standard hydrogen electrode decreases.

Tags

NGSS.HS-PS1-4

Which of the following diagrams represents the relationship between [Ni²⁺] and the mass of the Cu electrode as the cell above is in operation?

• 
• 
• 
• 
• more information needed

Determine which of the following actions would increase the measured cell potential.

• increasing the pressure of hydrogen gas in the hydrogen cell

• increasing the tin(II) ion concentration

• lowering the pH in the cathode compartment

• increasing the pH in the cathode compartment

• any of these things will increase the measure cell potential

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-5

Consider an electrochemical cell based on the reaction: 2H⁺_(aq) + Sn_(s) → Sn²⁺_(aq) + H_2(g) Which of the following actions would not change the measured cell potential?

• lowering the pH in the cathode compartment

• addition of more tin metal to the anode compartment

• increasing the tin (II) ion concentration in the anode compartment

• increasing the pressure of hydrogen gas in the cathode compartment

• any of these things will increase the measure cell potential

Tags

NGSS.HS-PS1-4

Dinitrogen pentoxide decomposes in a first- order reaction with a half-life of 7 minutes at 230°C according to the equation above.
If N₂O₅ is added to an evacuated flask to a pressure of 800 torr at 230°C, what is the total pressure in the flask after 14 minutes?

• 200 torr

• 800 torr

• 1400 torr

• 2300 torr

• 4200 torr

Tags

NGSS.HS-PS1-5