Compound Odor Boiling Point, °C Flammability
Ammonia Yes -33.3 Yes
Methyl vinyl ether Slight 12.0 Yes
Methyl chloride Yes -33.9 Yes
Sulfur dioxide Yes -10.0 No
Ethynyl bromide Yes 4.7 Yes
Freon 134a No -26.1 No
Carbon dioxide No -28.9 No
Good refrigerants are compounds that evaporate easily and are colorless, odorless, tasteless and chemically inert. Which of those listed below is(are) not suitable as good refrigerant(s)?
Question 1 options:
1) Sulfur dioxide.
2) Methyl chloride.
3) All of the options are not suitable as good refrigerants.
4) Ammonia.
5) Ethynyl bromide.
i think it is sulfur but just go with your gut.
SO2 was used at one time but isn't being used now. Ditto for NH3. Both are good refrigerants but both are lethal if a gas leak occurs in the system.
Freon 134a is being used now.
Here is a link that discusses CO2. It isn't as good as the others but has some benefits. http://refrigerationandairconditioning.danfoss.us/refrigerants/co2/#/
Methyl chloride was used at one time but not now (in consumer refrigeration) due to its toxicity as well as its flammability.
I couldn't find anything on ethynyl bromide but here is a good summary of refrigerant properties.
https://en.wikipedia.org/wiki/Refrigerant
To determine which of the listed compounds are not suitable as good refrigerants, we need to consider their properties.
According to the given information, good refrigerants should have the following properties:
1. Evaporate easily
2. Colorless
3. Odorless
4. Tasteless
5. Chemically inert
Let's check each compound against these properties:
1) Sulfur dioxide:
- It evaporates easily: Yes
- Colorless: No
- Odorless: No
- Tasteless: Not mentioned
- Chemically inert: No
Sulfur dioxide does not meet the criteria of being colorless and odorless. Therefore, it is not suitable as a good refrigerant.
2) Methyl chloride:
- It evaporates easily: Yes
- Colorless: No
- Odorless: No
- Tasteless: Not mentioned
- Chemically inert: No
Methyl chloride also does not meet the criteria of being colorless and odorless. Therefore, it is not suitable as a good refrigerant.
3) Ammonia:
- It evaporates easily: Yes
- Colorless: Not mentioned
- Odorless: No
- Tasteless: Not mentioned
- Chemically inert: No
Although ammonia evaporates easily, it does not meet the criteria of being odorless and chemically inert. Therefore, it is also not suitable as a good refrigerant.
4) Ethynyl bromide:
- It evaporates easily: Yes
- Colorless: No
- Odorless: No
- Tasteless: Not mentioned
- Chemically inert: No
Ethynyl bromide does not meet the criteria of being colorless and odorless, making it not suitable as a good refrigerant.
5) Freon 134a (carbon dioxide is not considered here as it is not mentioned):
- It evaporates easily: Not mentioned
- Colorless: Yes
- Odorless: Yes
- Tasteless: Yes
- Chemically inert: Yes
Freon 134a meets all the criteria as a good refrigerant. However, it is not considered in this question.
Based on the analysis, options 1) Sulfur dioxide, 2) Methyl chloride, 3) Ammonia, and 5) Ethynyl bromide are not suitable as good refrigerants. Therefore, the correct answer is option 3) All of the options are not suitable as good refrigerants.