Based on these properties, what are five materials (not grades of ...

[ETearle]

Based on these properties, what are five materials (not grades of the same material) that could be used for your project?
 
  What will be an ideal response?

Question 2

What are the benefits and limitations of material databases?
 
  What will be an ideal response?

Question 3

Compare the overall environmental impact of plastic and paper grocery sacks.
 
  What will be an ideal response?

Question 4

What is the biggest problem associated with incineration as a waste disposal method?
 
  What will be an ideal response?

[moormoney]

Answer to Question 1

The students should list five materials

Answer to Question 2

Benefits of Databases: allow for multiple criteria to be evaluated, creates a central location for information review, lists all the information for the different types of plastics, etc.
Limitations of Databases: not all the plastics listed are available anymore, not all of the desired search criteria may be available for searching the database, etc.

Answer to Question 3

Paper sacks are seen to be more polluting to make and dispose of. They can be biodegradable, although probably not in landfills because the conditions are not correct for degradation. The weight of paper bags and the volume of paper bags

are both much higher than an equal number of plastic bags, thus complicating the landfill problem.

Answer to Question 4

Incineration has a great potential for air pollution from the waste gases of the burning process.