The document describes an experiment with hydrogen peroxide, a cork, and yeast. Hydrogen peroxide was observed for odor, color, thickness, and flammability. When a cork was added to hydrogen peroxide in a test tube, bubbling occurred due to the production of oxygen gas, as evidenced by the gas produced. After the reaction, water was likely remaining in the test tube, with different properties than the original hydrogen peroxide. Yeast played a role in the chemical reaction by catalyzing the decomposition of hydrogen peroxide into water and oxygen gas.

1. Assessment<br />Describe the odor, color, viscosity (thickness), and flammability of hydrogen peroxide.<br />What happened when you put the cork on the test tube? Explain why this happened. <br />What kind of gas was produced by this reaction? What evidence do you have to prove this?<br />What do you think was left in the test tube at the end? Describe some of its properties. Is it the same substance that you started with?<br />What role does the yeast play in this chemical reaction?<br />coefficientcoefficientExample: SnO2 + 2 H2 -> Sn(s) + 2 H2OWrite a chemical equation for this reaction, using coefficients to balance the equation if necessary.<br />What evidence do you have that this was a chemical change and not a physical change?<br />