Welcome to the MSE's physics page. Here you will be able to find posts and links relating to your class. Please review the useful links below. Here you will find items you will most likely be using regularly.
Interactive Periodic Table: https://www.fishersci.com/us/en/periodic-table.html#c6
Online Calculator: https://www.mathsisfun.com/scientific-calculator.html
Google Play Calculator App (sorry iPhone users *cries in android*) https://play.google.com/store/apps/details?id=com.Revsoft.Wabbitemu
OK OK here is an iPhone Calc. App: https://apps.apple.com/us/app/graphing-calculator-x84/id1247828717