If you are going it alone and trying to teach science, you might value a simulation, especially for chemistry experiments. I remember my own uneasiness when I first let high school students do experiments with hydrochloride acid and other chemicals. I quickly learned to dilute the solutions until I was confident the teens wouldn’t try to experiment independently. Which are good? The gold standard is the University of Colorado’s PhET Simulations. There are simulations for all the major, math and science subjects. It is free but requires registration. Connected Chemistry, below PhET looks promising. I reviewed several other science simulations and cannot find any that rival PhET and are free.
Another sim with teachers’ guides is The Connected Chemistry Curriculum.



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