Aluminum and Redox Reactions Concepts

This video is part of the AP daily practice sessions, focusing on long free response questions. It covers the electron configuration of aluminum, explains atomic structure principles, and discusses the size difference between Al and Al3+. The video also includes a lab procedure for preparing a silver nitrate solution, completing a particle diagram for a reaction, and calculating cell potential using standard reduction potentials. It concludes with a discussion on free energy changes and equilibrium, offering tips for further review and additional resources.

What is the primary focus of the AP daily practice sessions discussed in the video?

• Short answer questions

• Multiple choice questions

• True or false questions

• Long free response questions

What is the complete ground state electron configuration for an aluminum atom?

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3s2 3p3

• 1s2 2s2 2p6 3s2 3p2

• 1s2 2s2 2p6 3s2 3p1

Why is the radius of an aluminum atom larger than that of an Al3+ ion?

• Al3+ ion has a larger nucleus

• Aluminum atom has more protons

• Al3+ ion has more electrons

• Aluminum atom has electrons in a higher energy level

Which equipment is necessary for preparing a precise 200.0 mL solution of silver nitrate?

• Volumetric flask

• Graduated cylinder

• Beaker

• Erlenmeyer flask

What is the first step in preparing a solution using a volumetric flask?

• Heat the flask

• Fill the flask completely with water

• Add the solid directly

• Partially fill the flask with distilled water

In a particle diagram, how are solid particles typically represented?

• Randomly scattered

• Widely spaced apart

• Touching each other

• Floating in water

What is the balanced chemical equation for the reaction between silver ions and aluminum?

• 4Ag+ + Al → 4Ag + Al4+

• Ag+ + Al → Ag + Al+

• 2Ag+ + Al → 2Ag + Al2+

• 3Ag+ + Al → 3Ag + Al3+

How do you calculate the cell potential for a redox reaction?

• Add the reduction potentials of both half-reactions

• Subtract the oxidation potential from the reduction potential

• Multiply the reduction potentials of both half-reactions

• Divide the reduction potential by the oxidation potential

What does a positive cell potential indicate about a reaction's free energy?

• Free energy is undefined

• Free energy is negative

• Free energy is zero

• Free energy is positive

What happens to the free energy change when a reaction reaches equilibrium?

• It becomes positive

• It remains constant

• It becomes zero

• It becomes negative