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DrOfEng

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    Lewis Diagrams, Resonance Structures, Bond Order - AP Chemistry
    2:08

    Lewis Diagrams, Resonance Structures, Bond Order - AP Chemistry

    This AP Chemistry video explains how to draw Lewis diagrams of the resonance structures of a molecule or polyatomic ion and determine the bond order. This video is part of Unit 2 of AP Chemistry on Molecular and Ionic Compound Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    44 views
    Chain Rule, Differentiation, Examples - AP Calculus AB/BC
    3:07

    Chain Rule, Differentiation, Examples - AP Calculus AB/BC

    This AP Calculus AB/BC video provides a worked example on using the chain rule for differentiating composite functions. This video is part of Unit 3 of AP Calculus AB/BC on Differentiation - Composite, Implicit and Inverse Functions. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    60 views
    Vector Dot Product, Commutativity - AP Physics C (Mechanics)
    1:13

    Vector Dot Product, Commutativity - AP Physics C (Mechanics)

    This AP Physics C (Mechanics) video defines the vector dot product. This video is part of Unit 3 of AP Physics C (Mechanics) on Work, Energy and Power. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    58 views 2 comments
    Nested for Loops, Algorithm, Mode, Example - AP Computer Science A
    5:06

    Nested for Loops, Algorithm, Mode, Example - AP Computer Science A

    This AP Computer Science A video covers a worked example on using nested iteration (for loops) to find the mode of a list of numbers. Post your comments/questions below and please subscribe.
    43 views 1 comment
    Lewis Diagrams - AP Chemistry
    2:09

    Lewis Diagrams - AP Chemistry

    This AP Chemistry video explains how to draw a Lewis diagram for a molecule or polyatomic ion using a set of rules. This video is part of Unit 2 of AP Chemistry on Molecular and Ionic Compound Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    25 views
    Chain Rule, Composite Functions - AP Calculus AB/BC
    1:30

    Chain Rule, Composite Functions - AP Calculus AB/BC

    This AP Calculus AB/BC video defines the chain rule for differentiating composite functions. This video is part of Unit 3 of AP Calculus AB/BC on Differentiation - Composite, Implicit and Inverse Functions. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    27 views
    Newton's Third Law of Motion, Example - AP Physics C (Mechanics)
    1:06

    Newton's Third Law of Motion, Example - AP Physics C (Mechanics)

    This AP Physics C (Mechanics) video covers a worked example on Newton's Third Law of motion. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    29 views
    Nested Iteration, Nested for Loops - AP Computer Science A
    2:04

    Nested Iteration, Nested for Loops - AP Computer Science A

    This AP Computer Science A video explains nested iteration, using for loops as an example. Post your comments/questions below and please subscribe.
    61 views
    Substitutional Alloys, Metals - AP Chemistry
    0:44

    Substitutional Alloys, Metals - AP Chemistry

    This AP Chemistry video explains the structure of substitutional alloys using brass as a typical example. This video is part of Unit 2 of AP Chemistry on Molecular and Ionic Compound Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    32 views
    Derivatives of Trig Functions, Examples - AP Calculus AB/BC
    3:55

    Derivatives of Trig Functions, Examples - AP Calculus AB/BC

    This AP Calculus AB/BC video covers worked examples on evaluating the derivatives of trig functions using trig identities and derivative rules. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    24 views
    Newton's Third Law of Motion - AP Physics C (Mechanics)
    1:34

    Newton's Third Law of Motion - AP Physics C (Mechanics)

    This AP Physics C (Mechanics) video defines Newton's Third Law of motion for describing the forces due to the interaction between bodies. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    22 views
    Algorithms using Strings, for Loops, Reverse a String - AP Computer Science A
    2:54

    Algorithms using Strings, for Loops, Reverse a String - AP Computer Science A

    This AP Computer Science A video explains an algorithm that uses for loops to reverse a string. Post your comments/questions below and please subscribe.
    63 views
    Interstitial Alloys, Metals - AP Chemistry
    1:10

    Interstitial Alloys, Metals - AP Chemistry

    This AP Chemistry video explains the structure of interstitial alloys using steel as a typical example. This video is part of Unit 2 of AP Chemistry on Molecular and Ionic Compound Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    61 views
    Derivatives of tan(x), cot(x), sec(x) and cosec(x) - AP Calculus AB/BC
    3:29

    Derivatives of tan(x), cot(x), sec(x) and cosec(x) - AP Calculus AB/BC

    This AP Calculus AB/BC video demonstrates how to evaluate the derivatives of trig functions using trig identities and derivative rules. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    38 views
    Banked Surface, Uniform Circular Motion, Example - AP Physics C (Mechanics)
    1:38

    Banked Surface, Uniform Circular Motion, Example - AP Physics C (Mechanics)

    This AP Physics C (Mechanics) video covers a worked example on uniform circular motion on a banked surface. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    43 views
    Algorithms using Strings, for Loops, Count Substring - AP Computer Science A
    3:29

    Algorithms using Strings, for Loops, Count Substring - AP Computer Science A

    This AP Computer Science A video explains an algorithm that uses for loops to count the number of substrings in a string. Post your comments/questions below and please subscribe.
    13 views
    Structure of Metals, Sea of Electrons Model - AP Chemistry
    1:18

    Structure of Metals, Sea of Electrons Model - AP Chemistry

    This AP Chemistry video explains the structure and properties of metals, and metallic bonds using the sea of electrons model. This video is part of Unit 2 of AP Chemistry on Molecular and Ionic Compound Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    6 views
    Quotient Rule, Differentiation, Examples - AP Calculus AB/BC
    1:48

    Quotient Rule, Differentiation, Examples - AP Calculus AB/BC

    This AP Calculus AB/BC video provides a worked example on applying the quotient rule for evaluating the derivatives of the quotients of differentiable functions. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    3 views
    Banked Surface, Uniform Circular Motion, Example - AP Physics C (Mechanics)
    2:05

    Banked Surface, Uniform Circular Motion, Example - AP Physics C (Mechanics)

    This AP Physics C (Mechanics) video covers a worked example on uniform circular motion on a banked surface. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    8 views
    for Loops, Equivalence to while Loops - AP Computer Science A
    4:32

    for Loops, Equivalence to while Loops - AP Computer Science A

    This AP Computer Science A video explains for loops and their equivalence to while loops. Post your comments/questions below and please subscribe.
    8 views
    Ionic Solids, Structure, Properties - AP Chemistry
    1:56

    Ionic Solids, Structure, Properties - AP Chemistry

    This AP Chemistry video explains the structure and properties of ionic solids. This video is part of Unit 2 of AP Chemistry on Molecular and Ionic Compound Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    11 views
    The Quotient Rule, Differentiation, Mnemonic - AP Calculus AB/BC
    0:44

    The Quotient Rule, Differentiation, Mnemonic - AP Calculus AB/BC

    This AP Calculus AB/BC video defines the quotient rule for evaluating the derivatives of the quotients of differentiable functions. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    8 views
    Uniform Circular Motion, Example - AP Physics C (Mechanics)
    1:23

    Uniform Circular Motion, Example - AP Physics C (Mechanics)

    This AP Physics C (Mechanics) video covers a worked example on uniform circular motion. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    9 views
    while Loops, Algorithms, Find Sum, Mean, Median - AP Computer Science A
    4:16

    while Loops, Algorithms, Find Sum, Mean, Median - AP Computer Science A

    This AP Computer Science A video covers an algorithm that uses while loops to find the sum, mean and median of a list of numbers. Post your comments/questions below and please subscribe.
    21 views 2 comments
    Interactions, Cations and Anions, Coulomb's Law - AP Chemistry
    1:42

    Interactions, Cations and Anions, Coulomb's Law - AP Chemistry

    This AP Chemistry video explains the interactions between cations and anions using Couloumb's law. This video is part of Unit 2 of AP Chemistry on Molecular and Ionic Compound Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.
    9 views 1 comment