Question

data table: diffusion time in seconds, trial 1, trial 2; beaker with hot water; beaker with cold water. which materials are required for this experiment? select all that apply. beakers of different sizes; hot water and cold water; food coloring; four stopwatches

Explanation:

To determine the correct materials for the diffusion experiment (comparing hot and cold water):

• Beakers of different sizes: Incorrect. The experiment should control variables (like beaker size) to isolate temperature’s effect. Same - sized beakers are needed.
• Hot water and cold water: Correct. These are the temperature - varied media for diffusion.
• Food coloring: Correct. It’s the solute whose diffusion (spreading) is observed.
• Four stopwatches: Incorrect. For trials (e.g., 2 trials for hot and 2 for cold), 2 stopwatches (one for hot, one for cold) or reusing a stopwatch would suffice, not four.

Answer:

B. hot water and cold water
C. food coloring