DrOfEng

This AP Chemistry video demonstrates how to draw the geometry of a molecule using bond hybridisation and VSEPR, where the central atom is sp3 hybridised with 3 sigma bonds and a lone pair of electrons. 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.

This AP Calculus AB/BC video provides a worked example on how to obtain the second derivative of a function. 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.

This AP Physics C (Mechanics) video defines conservative forces and demonstrates how the work done by these forces is path independent. 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.

This AP Computer Science A video explains how primitive and reference parameters are used in a method in a Java class. This video uses the Eclipse IDE for Java Developers. See this link for the installation instructions, which should be easy to follow https://www.eclipse.org/downloads/packages/installer I recommend that you download and install it to practice your Java programming. Post your comments/questions below and please subscribe.

This AP Chemistry video demonstrates how to draw the geometry of a molecule using bond hybridisation and VSEPR, where the central atom is sp3 hybridised with 4 sigma bonds. 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.

This AP Calculus AB/BC video explains how to obtain the higher-order derivatives of a function. 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.

This AP Physics C (Mechanics) video defines the elastic potential energy stored in a spring in a spring-mass system. 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.

This AP Computer Science A video explains how to write methods in a Java class. This video uses the Eclipse IDE for Java Developers. See this link for the installation instructions, which should be easy to follow https://www.eclipse.org/downloads/packages/installer I recommend that you download and install it to practice your Java programming. Post your comments/questions below and please subscribe.

This AP Chemistry video demonstrates how to draw the geometry of a molecule using bond hybridisation and VSEPR, where the central atom is sp2 hybridised with 2 sigma bonds and a lone pair of electrons. 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.

This AP Calculus AB/BC video covers worked examples on selecting procedures to evaluate derivatives. 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.

This AP Physics C (Mechanics) video defines the gravitational potential energy stored in a particle near the surface of the Earth. 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.

This AP Computer Science A video explains mutator or modifier methods in a Java class. This video uses the Eclipse IDE for Java Developers. See this link for the installation instructions, which should be easy to follow https://www.eclipse.org/downloads/packages/installer I recommend that you download and install it to practice your Java programming. Post your comments/questions below and please subscribe.

This AP Chemistry video demonstrates how to draw the geometry of a molecule using bond hybridisation and VSEPR, where the central atom is sp2 hybridised with 3 sigma bonds. 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.

This AP Calculus AB/BC video provides a summary of the general derivatives of inverse trig functions and tips on how to remember them. 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.

This AP Physics C (Mechanics) video covers a worked example on the work-energy theorem. 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.

This AP Computer Science A video explains the toString method in a Java class, and how it can be overriden to provide the values stored in the instance data of an object. This video uses the Eclipse IDE for Java Developers. See this link for the installation instructions, which should be easy to follow https://www.eclipse.org/downloads/packages/installer I recommend that you download and install it to practice your Java programming. Post your comments/questions below and please subscribe.

This AP Chemistry video demonstrates how to draw the geometry of a molecule using bond hybridisation and VSEPR, where the central atom is sp hybridised. 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.

This AP Calculus AB/BC video covers worked examples on evaluating the derivatives of inverse trig 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.

This AP Physics C (Mechanics) video defines the work-energy theorem and kinetic energy. 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.

This AP Computer Science A video explains accessor methods in a Java class, return by value and return by reference. This video uses the Eclipse IDE for Java Developers. See this link for the installation instructions, which should be easy to follow https://www.eclipse.org/downloads/packages/installer I recommend that you download and install it to practice your Java programming. Post your comments/questions below and please subscribe.

This AP Chemistry video covers worked examples on Lewis diagrams. 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.

This AP Calculus AB/BC video demonstrates how to obtain the derivatives of inverse trigonometric 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.

This AP Physics C (Mechanics) video covers a worked example on the work done by a force acting on a particle. 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.

This AP Computer Science A video explains preconditions and postconditions in a Java program. This video uses the Eclipse IDE for Java Developers. See this link for the installation instructions, which should be easy to follow https://www.eclipse.org/downloads/packages/installer I recommend that you download and install it to practice your Java programming. Post your comments/questions below and please subscribe.

This AP Chemistry video explains how to draw the Lewis diagram for a free radical (has unpaired electrons). 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.