Hydrofluorocarbons (HFCs)and Hydrochlorofluorocarbons (HCFCs)are Good Substitutes for Chlorofluorocarbons (CFCs)because

question 99

Multiple Choice

Hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs) are good substitutes for chlorofluorocarbons (CFCs) because

• A)they are also greenhouse gases.
• B)C-F bonds will react more easily with hydroxyl radicals, so they are broken down before they reach the stratosphere.
• C)C-H bonds will react more easily with hydroxyl radicals, so they are broken down before they reach the stratosphere.
• D)they are too heavy to reach the stratosphere.

Understand the characteristics and identification of common sleep disorders.

Recognize the stages of sleep and their unique characteristics.

Identify behaviors and recommendations for managing insomnia.

Understand the concept of REM rebound and its implications.