Lesson Details Grade Level: 7th Grade Science (adaptable for other middle school grades) Time Required: 3–5 class periods Format: Editable Word document Skills Students Practice Experimental design Identifying independent, dependent, and control variables Data collection and graphing Analyzing patterns in data Writing scientific explanations using CER (Claim–Evidence–Reasoning) Materials Needed Sugar, salt, or drink mix Water (warm and/or cold) Clear cups or beakers Stopwatch