객관식
If a saturated solution of K2SO4 at 60 °C (where the solubility is 21.5 g per 100 g H2O) is cooled to 0 °C (where the solubility is 7.4 g per 100 g H2O), what mass of K2SO4 will crystallize out from 100 g of water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
Multiple Choice
Liquid carbon dioxide is considered a good green alternative solvent because:
A
it is highly flammable and easy to store
B
it is non-toxic and does not contribute to hazardous waste
C
it increases the solubility of heavy metal salts in water
D
it reacts violently with most organic compounds
검증된 단계별 안내1
Identify the key properties of liquid carbon dioxide relevant to its use as a green solvent. Consider factors such as toxicity, environmental impact, flammability, and chemical reactivity.
Recall that a green solvent should ideally be non-toxic, environmentally benign, and not produce hazardous waste during or after use.
Evaluate each option based on these criteria:
- 'Highly flammable and easy to store' is generally not desirable for safety reasons.
- 'Non-toxic and does not contribute to hazardous waste' aligns well with green chemistry principles.
- 'Increases solubility of heavy metal salts in water' is not a typical characteristic of liquid CO2 and may not relate to green solvent properties.
- 'Reacts violently with most organic compounds' would be unsafe and undesirable.
Conclude that the property making liquid carbon dioxide a good green solvent is its non-toxicity and minimal environmental impact, meaning it does not contribute to hazardous waste.
Summarize that liquid CO2's advantages as a green solvent stem from its safety and environmental friendliness rather than flammability or reactivity.
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