Steel Wool Lab Day 3

1. Steel Wool Lab Day 3 PRS Check of your understanding

2. When we put the steel wool in vinegar, water, and then exposed it to the air in the test tube, what happened to it? • Nothing • It had a chemical reaction which produced water • It had a chemical reaction which produced rust • It had a chemical reaction which produced oxygen

3. When we put the steel wool in vinegar salt water, and then exposed it to the air in the test tube, what happened to it? • Nothing • It had a chemical reaction which produced water • It had a chemical reaction which produced rust • It had a chemical reaction which produced oxygen

4. When the steel wool rusted, what happened to the test tube? • The glass broke • Water went into the test tube • Gas went into the test tube • The test tube expanded

5. When the steel wool rusted, what happened to the test tube? • The glass broke • Water went into the test tube • Gas went into the test tube • The test tube expanded

6. Why did the water go into the test tube? • Oxygen gas became a solid and solids take up less space than gases. • Carbon Dioxide gas became a solid and solids take up less space than gases. • Oxygen gas became a solid and solids take up more space than gases. • Carbon Dioxide gas became a solid and solids take up more space than gases.

7. Why did the water go into the test tube? • Oxygen gas became a solid and solids take up less space than gases. • Carbon Dioxide gas became a solid and solids take up less space than gases. • Oxygen gas became a solid and solids take up more space than gases. • Carbon Dioxide gas became a solid and solids take up more space than gases.

8. Based upon the following information, what was the volume of gas in the test tube at the start of the experiment? Click in your answer. Gas Volume at end of the experiment = 36 ml Volume of water in the test tube at end of the experiment = 7 ml Note: at the start of the lab there was no water in the test tube

9. Based upon the following information, what was the volume of gas in the test tube at the start of the experiment? Answer = 43 ml Gas Volume at end of the experiment = 36 ml Volume of water in the test tube at end of the experiment = 7 ml Note: at the start of the lab there was no water in the test tube

10. Based upon the following information, what was the volume of oxygen in the test tube at the start of the experiment? Click in your answer. Gas Volume at end of the experiment = 36 ml Volume of water in the test tube at end of the experiment = 7 ml Note: at the start of the lab there was no water in the test tube

11. Based upon the following information, what was the volume of oxygen in the test tube at the start of the experiment? Answer = 7ml Gas Volume in the test tube at end of the experiment = 36 ml Volume of water in the test tube at end of the experiment = 7 ml Note: at the start of the lab there was no water in the test tube

12. Based upon the following information, what is the calculated percentage of Oxygen in the air? Click in your answer. Gas Volume at end of the experiment = 36 ml Volume of water in the test tube at end of the experiment = 7 ml Note: at the start of the lab there was no water in the test tube

13. Based upon the following information, what is the calculated percentage of Oxygen in the air? 7 ml / 43 ml *100 = 16.2%  rounds to 16% Gas Volume at end of the experiment = 36 ml Volume of water in the test tube at end of the experiment = 7 ml Note: at the start of the lab there was no water in the test tube

14. What is the actual percentage of oxygen in air according to scientists? • Click in your answer

15. What is the actual percentage of oxygen in air according to scientists? About 21 %

16. What would your percent error be if your lab value of % oxygen was 26% while experts say it should be 21%? Click in your answer in percent rounded to the nearest whole number.

17. What would your percent error be if your lab value of % oxygen was 26% while experts say it should be 21%? (26-21) X 100 = 5/21 X 100 = 23.8 rounds to 24 21