G. C. 1-1 Identification of Metals 7 G. C. I-I: GROUP DISCUSSION QUESTIONS

1. Which way turned out to be the most accurate to determine the density of the metal, calculation from a single data point, slope of the manually drawn or the computer-created graph? What do you think, why?

2. A sample of an unknown alloy has a density of 10.582 g/cm³. If its components come from the five met als from today's lab, can you estimate what the predominant metal is? If so, which is it?

3. Describe how you would modify the experiment if you had a metal that floated on the water. How would you change the experiment to obtain the volume of the metal?

4. Since the metal sample is a cylinder is there another way you could determine the volume of the cylin der other than via displacement of water? If so, describe how you would go about doing so and include any relevant equations. Hint: Think back to geometry.

5. Do you think determining the density using this method would be more accurate than those performed by today's experiment? Hint: Consider different errors in determining volume via water displacement versus the method described in Question 4 above.

1. Which way turned out to be the most accurate to determine the density of the metal, calculation from a single data point, slope of the manually drawn or the computer-created graph? What do you think, why?

2. A sample of an unknown alloy has a density of 10.582 g/cm³. If its components come from the five met als from today's lab, can you estimate what the predominant metal is? If so, which is it?

3. Describe how you would modify the experiment if you had a metal that floated on the water. How would you change the experiment to obtain the volume of the metal?

4. Since the metal sample is a cylinder is there another way you could determine the volume of the cylin der other than via displacement of water? If so, describe how you would go about doing so and include any relevant equations. Hint: Think back to geometry.

5. Do you think determining the density using this method would be more accurate than those performed by today's experiment? Hint: Consider different errors in determining volume via water displacement versus the method described in Question 4 above.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.