The solubility of KClO 3 increases as the temperature increases. The solution may be saturated, but it likely is less than saturated. Only when some solid remains undissolved are you sure it is saturated. The presence of undissolved solid suggests that the solution is saturated. All of the solutions in the 12-well strip are saturated when cooling to ice temperature since all start at above ice temperature.
Gases become less soluble as the temperature is raised.
You may also want to collect class data for a graph. Top TG Lab Hints Prepare six large sized test tubes containing potassium chlorate about half full then add distilled water to a depth 5-6 centimeters higher. Heat these in large baths set to the indicated temperatures. Maintaining exact temperatures will be a problem, and using large baths and hot plates will help. When many students are in the class, use 2 or 3 test tubes per bath.