Students compare tap water, distilled water, filtered water, bottled spring water, and boiled and cooled tap water to see which produces the largest and highest-quality Epsom salt crystals over a seven-day observation period. The sheet walks your homeschooler through writing a hypothesis, identifying controlled variables, following a six-step procedure, and recording daily observations in a structured results table that tracks crystal size and quality. Suited for grades 4-7, this water types affect crystal formation experiment builds real scientific literacy around variables, solution saturation, and patient data collection.

Fit this into a chemistry or earth science unit study focused on minerals, crystallography, or states of matter, and it works equally well as a standalone two-week project. Your student demonstrates understanding of controlled experiments by keeping jar size, salt amount, string length, and temperature consistent across all four test jars, then draws evidence-based conclusions from their own recorded data. The conclusion section asks which water produced the largest crystals, which produced the smallest or none, and what the student would change in a second run.