The development research of the Thermochemistry E-LKPD based on Connecting, Organizing, Reflecting, and Extending (CORE) using the Liveworksheets platform in 11th grade high school to produce a valid E-LKPD and to determine user responses to the thermochemistry ELKPD based CORE using Liveworksheets during the learning process. This type of research is developmental research using the 4-D de…