This is a great question to pose and I have considered this same thing a great deal within my pre-service teaching program. The first thing I would try, given that we can’t assume every child has access to the same resources, is some demonstrations. Whether completed live over Zoom or using a pre-recorded video, you can engage students in critical thinking and inquiry by completing exciting demonstrations using things around your home. Then, if students do have access to the materials, they can complete the experiment at home ( safe experiments). I will provide a list of websites that offer great at-home hands-on experiments. If you would like students to complete experiments at home, consider making packets of supplies that can either be picked up or dropped off.
Additionally, students can access incredible resources virtually such as Minecraft Education Edition, PHET labs, National Geographic, and even virtual science field trips that keep them excited and interested in science from the safety of home.
All in all, I do believe there are many ways to keep students engaged and excited about science in the virtual setting. Simply encouraging students to go outside and explore their environment, keeps them active and engaged in the science all around them.
Hope these resources can be of some help to you!
https://aroundthekampfire.com/2020/03/10-fun-science-lessons-kids-can-do-at-home-distance-learning-activities.html - Use food, make food, watch the growth of plants, and experiment with balloons. This site offers many ways for students to complete hands-on experiments at home.
https://www.curiositymachine.org/challenges/ - Learn through exciting challenges created through common household items.
https://mysteryscience.com/distance-learning - This program is used in many schools as their main science curriculum.