A group of students were asked to identify three white powders. The students use the physical and chemical properties to identify the powders. They computed The density of each powder. They check to see if any dissolved in water. One of the powders did not dissolve in water and they thought it was corn starch. They knew that cornstarch felt slippery and reacted with iodine. The students put a few drops of iodine on each white powder. One powder turned black it was definitely cornstarch. Another powder, baking soda reacted with vinegar. It first and the test tube got hot. Which of these is an observed chemical property? A. Color of powders B. Density of powders C. Powder dissolved in water D. Powder reacts with vinegar? Please please please help me

Explanation: All the other choice is physical change. Choice A is a change of color but it doesn’t change the properties. Choice B is an example of physical change which is simply for measurements therefore doesn’t affect the properties. Choice C is also physical change because solubility and dissolve are type of physical change leaving us with the last choice which is choice D. Since the powder reacts with the vinegar it changes the property of the powder.