Question

A student conducts an experiment in which he dissolves 1.0 grams of several substances in 50 milliliters of water. He has 12 identical plastic cups of water. He places 1.0 of salt into three of the cups. 1.0 of sugar into three of the cups and 1.0 of baking soda into three of the cups. The three remaining cups contain only water. He places all the cups in a freezer and records the temperature of the water in each cup every 15 minutes for 4 hours. which of the following is the student most likely investigating

Answer 1

In the given question the student is most likely investigating the cooling effect in terms of cooling rate of water in terms of different solutes. The student has dissolved substances such as salt, sugar and baking soda in water. This solution of substances dissolved in water is then placed in the freezer and effect of solutes in colling rate with temperature drop is being monitored here. A time parameter such as every 15 minutes time interval for 4 hours is helpful in determining the rate parameter. In this experiment an independent variables such as different solutes like salt, sugar and baking soda and the dependent variable being study as the cooling rate of the solutions. So in this experiment essentially the cooling rate is being studied and determined by the student in the mentioned experiment.