Plan Temperature Investigation Practice Test

A student will investigate: Which material insulates best—foam, plastic, or fiberglass? The student plans to wrap identical jars with each insulation material and fill them with hot water. Which controlled variables are most important to keep the test fair?

A student is planning an investigation: How does the mass of water affect heating time? The student will test 100 g, 200 g, and 400 g of water on the same hot plate, heating each from $20,^{\circ}\mathrm{C}$ to $80,^{\circ}\mathrm{C}$. Which materials/equipment are necessary to carry out this investigation?