Green Chemistry Questions

See the discussion of focus areas and the principles of green chemistry in the Introduction before attempting these questions.

1. PERC replaced gasoline and kerosene in the dry-cleaning process.

(a) Describe any environmental problems or worker hazards that would be associated with these solvents.

(b) Would these same environmental problems or worker hazards be eliminated by the use of PERC?

(c) By the use of carbon dioxide?

2. The development of surfactants for carbon dioxide by Joseph DeSimone won a Presidential Green Chemistry Challenge Award, (a) Into which of the three focus areas for these awards does this award best fit?

(b) List two of the twelve principles of green chemistry that are addressed by the green chemistry developed by DeSimone.

3, The ions in ionic liquids (ILs) have weak ionic attractions for one another. This weak interaction is due to one or more factors including

• the presence of bulky nonpolar groups that prevent the close interaction of the charged regions of the ions, and

• delocalized and/or dispersed charges resulting in low charge density.

Inspect the ILs in Figure 3-12 and discuss the structural features of these compounds that result in weak interactions between the oppositely charged ions.

4. The discovery of the dissolution of cellulose with ionic liquids and the formation of various cellulose composites by Robin Rogers won a Presidential Green Chemistry Challenge Award.

(a) Into which of the three focus areas for these awards does this award best fit?

(b) The use of an abundant and naturally occurring polymer, a microwave heat source, and ionic liquids are three important green chemistry aspects of this study. For each of these aspects, list at least two of the twelve principles of green chemistry that are addressed in this study.

Coping with Asthma

Coping with Asthma

If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.

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