Which reaction results in only a physical change? a. 2h2o(l) + electricity ® 2h2(g) + o2(g) b. 2h2o2(l) ® 2h2o(l) + o2(g) c. 2h2(g) + o2(g) ® 2h2o(l) d. h2o(l) + heat ® h2o(g)

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.