Question

while researching a topic, a student has taken the following notes:

• refrigerants are chemical compounds used in cooling technologies, such as air conditioners.
• air conditioners can use refrigerants to absorb heat and release cold air.
• the refrigerant dichloromethane is a hydrochlorocarbon (hcc).
• hccs are composed of the elements hydrogen, chlorine, and carbon.
• the refrigerant tetrafluorohexane is a perfluorocarbon (pfc).
• pfcs are composed of fluorine and carbon.

the student wants to contrast dichloromethane and tetrafluorohexane.
which choice most effectively uses relevant information from the notes to accomplish this goal?
a. dichloromethane, a hydrochlorocarbon, is composed of hydrogen, chlorine, and carbon; tetrafluorohexane, a perfluorocarbon, is composed of fluorine and carbon.
b. dichloromethane and tetrafluorohexane are chemical compounds used in cooling technologies; the compounds are known as refrigerants.
c. the hydrochlorocarbon dichloromethane and the perfluorocarbon tetrafluorohexane are both refrigerants that can be used in cooling technologies like air conditioners.
d. tetrafluorohexane, a refrigerant, can be used in cooling technologies to absorb heat and release cold air.

Explanation:

To contrast dichloromethane and tetrafluorohexane, we need to highlight their differences. Option A compares their chemical compositions (dichloromethane: H, Cl, C; tetrafluorohexane: F, C), which is a clear contrast. Option B and C focus on similarities, and D only describes tetrafluorohexane.

Answer:

A. Dichloromethane, a hydrochlorocarbon, is composed of hydrogen, chlorine, and carbon; tetrafluorohexane, a perfluorocarbon, is composed of fluorine and carbon.