After a heavy snowfall, sanitation workers often sprinkle salt on the road to melt the snow. (1) According to Xiao Ming’s analysis, salted ice melts easily and salted water should

(1) Difficult (2) Stopwatch (or clock, etc.), water, state (3) C, the freezing point of salt water is lower than 0℃

(1) Xiao Ming adds salt according to Ice melts easily, and water with salt added should be difficult to solidify. (2) The experiment also requires a timing instrument: a stopwatch; the amount of water needs to be controlled to be the same during the experiment; the state of the salt water must be observed every 10 minutes until a conclusion is drawn. (3) The freezing point of salt water is less than 00°C. The thermometer should be one that can measure negative temperature values. It can be seen from the figure that a C thermometer should be used.