Welcome to, the website of Andy Allan, retired science teacher in Visalia, California. I taught for thirty-three years in Visalia Unified School District, but the content of this website is my own creation and my own responsibility. I believe that the contents are appropriate for secondary instruction, as are any resources linked from within this site. Feel free to look around. Some of the resources may be very specific to the courses, while others may be of general use to many high school science students and instructors. Students and teachers may print, or download and use any materials that you find helpful. I DO NOT answer homework questions.

A Plea From Me to You

A global pandemic. Not the hand we wanted, but these are the cards that we have been dealt. Students – I know that the disruption to your academics, activities and relationships has left you with more questions than answers. Teachers – You have been separated from students at a critical time in the school year. You, too, have more questions than answers. My plea to all of you is simple – please listen to the medical experts. The sooner that everyone is on board with social distancing and the other recommendations, the more lives we save and the sooner our lives can be restored to normal. Acting responsibly WILL SAVE LIVES.

If you are a teacher and you have been thrown into the expectation of providing distance learning for your students, without adequate training or support, please understand that there is an enormous community of tech savvy folks who have your back. For any question you have, you will find an answer. YouTube will your first and best resource. I made extensive use of Google Classroom before retiring, and you can as well. If you have no experience with Google Classroom, five minutes on YouTube will save you hours of frustration. If you have questions for me, I will try to answer them as well.


The Chemistry Page will give first year chemistry students access to all of the notes, worksheets, labs, Powerpoints and other important documents for the last General Chemistry classes that I taught in the 2018 – 2019 school year. For instructors, I have also left a Course Calendar from that year. Interactive review activities for important concepts, organized by units, are provided to help the student prepare for important benchmarks and tests. Though retired, I’m continuing to add to the review activities, with a goal of creating HTML5/Mobile Compliant activities for all of the content in the course.

AP Chemistry

Nineteen years after teaching my first section of AP Chemistry, I handed the course over to a colleague at the start of the 2017 – 2018 school year. Now that I am retired, I will be using many of the quiz and test questions that I have written over the years as material for updated review activities, so look for those to be added.

The AP Chemistry Page hosts the resources for the class, which include PowerPoints in HTML 5 format, notes, and review activities. Though I developed the resources for my own AP students, they will probably also prove useful to AP students at other schools as well as college students taking a first year chemistry course.


Though it has been some time since I taught Biology, I will continue to provide access to my old course materials, including Powerpoints (web-based and offline formats) and interactive review activities to help the student prepare for important benchmarks and tests. Now that I am officially retired, I am going to indulge my life-long love of biological science, so I’ve begun to add new review activities for biology students. I am committing to adding at least one new activity each week.

Some background on me can be found HERE. I do appreciate hearing from users of this site. Let me know if you find mistakes, or if there are features that you think I might add. You may most easily contact me at [email protected]. I will do my best to respond to you, but please understand that commitments to my family come first.

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