Name ____________________________________________ Date ____________________ Per. _______

Assessment

1. Describe the odor, color, viscosity (thickness), and flammability of hydrogen peroxide.

2. What happened when you put the cork on the test tube? Explain why this happened.

3. What kind of gas was produced by this reaction? What evidence do you have to prove

this?

4. 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?

5. What role does the yeast play in this chemical reaction?

6. Write a chemical equation for this reaction, using coefficients to balance the equation if

necessary.

7. What evidence do you have that this was a chemical change and not a physical change?

Example: SnO2 + 2 H2 → Sn(s) + 2 H2O

coefficient coefficient