Exploring Science in Fourth Grade

Fourth-graders in Ms. Siau's class at Shabonee had to identify two powders mixed in this bag by experimenting and observing.


The students had previously explored the properties of five different white powders when mixed with four different kinds of liquids -- red cabbage juice, iodine, vinegar and water.


They had to determine the mystery powders by using what they learned in their earlier experimentation. Ms. Siaiu dropped iodine on the mystery powders and the students observed the result.


The mystery powder could be a mixture of any two of the following: salt, alum, baking soda, corn starch or talcum.


The students observed the reaction of the liquids and the mystery powders and recorded their observations in their notebooks. In this case, the liquid caused the powders to fizz.