Question
Kevin's Experiment
Kevin's Experiment
Kevin sets up a simple science experiment. He fills a test tube with sodium hydroxide solution. Then, he ties a string around the test tube and pulls it tight under the stopper of a flask containing a copper sulfate solution. When Kevin releases the string, the test tube falls into the copper sulfate solution and the two solutions combine. A diagram of the setup is shown.
The setup on the left shows a flask partially filled with copper sulfate solution closed with a stopper. Inside the closed flask is a small test tube filled with sodium hydroxide solution attached to a string hovering above the copper sulfate solution. The flask sits on an electronic balance that shows the mass of the setup is 67.25 grams. An arrow pointing to the right shows the solutions mix thoroughly. The setup on the right shows the closed flask with sodium sulfate solution inside. The small test tube is in the solution and pieces of solid copper hydroxide have formed. The flask sits on an electronic balance that shows the mass of the new setup is unknown.
Multiple Choice Question
Which statement BEST describes Kevin's science experiment?
A.
The experiment shows an example of a physical change because the products have the same properties as the reactants.
B.
The experiment shows an example of a chemical change because the products have different properties than the reactants.
C.
The experiment shows an example of a chemical change because the products have the same properties as the reactants.
D.
The experiment shows an example of a physical change because the products have different properties than the reactants.
Answers
GPT-4o mini
The correct answer is:
B. The experiment shows an example of a chemical change because the products have different properties than the reactants.
In Kevin's experiment, when sodium hydroxide (a strong base) mixes with copper sulfate (a salt), a chemical reaction occurs, resulting in the formation of copper hydroxide, which is a solid precipitate. This indicates a chemical change, as the properties of the products (copper hydroxide) are different from those of the original reactants (sodium hydroxide and copper sulfate).
B. The experiment shows an example of a chemical change because the products have different properties than the reactants.
In Kevin's experiment, when sodium hydroxide (a strong base) mixes with copper sulfate (a salt), a chemical reaction occurs, resulting in the formation of copper hydroxide, which is a solid precipitate. This indicates a chemical change, as the properties of the products (copper hydroxide) are different from those of the original reactants (sodium hydroxide and copper sulfate).