When the bags were squeezed and the smaller bag opened releasing the water, the boys felt the larger bag get warmer. "Wow! Yours is much warmer than mine." said Michael. What can Michael try to produce a hotter hand warmer? A. Use less water in the smaller bag.
B. Michael could try to duplicate Juan Carlos' procedure and amounts.
C. Use more calcium chloride in the larger bag and more water in the smaller bag.
D. Measure each reactant, experimenting to find the best ratio to produce the most heat.