Through 3/31, the American Association of Chemistry Teachers (AACT) has unlocked resources for teaching chemistry remotely, including activities, animations, projects, simulations, and videos. This site has activities for elementary, middle, and high school students. Source: https://teachchemistry.org/
This site from the Institute of Physics calls itself “your guide to physics on the web” and includes games, videos, and free physics lessons designed for online students. Source: http://www.physics.org/index.asp
Explore this YouTube channel for a collection of engaging videos that use whiteboard animation to explain physics-related topics in approximately one minute. Source: https://www.youtube.com/user/minutephysics/
Here are a couple of links to help parents get familiar with Google Classroom and finding learning material online.