Passage III
The solubility of a substance is typically defined as the maximum mass, in grams (g), of the substance (the solute) that will stay dissolved in 100 g of a solvent (such as water). The solubility of a substance generally varies as the temperature of the solvent changes. Figure 1 shows, for each of 5 substances, how solubility in water varies with temperature.
Figure 2 shows, for 3 temperatures (25°C, 40°C, and 60°C), how the solubility of sucrose varies as the percent by mass of water in solvent mixtures of water and ethanol varies.
Figure 2 adapted from A. M. Peres and E. A. Macedo, "Phase Equilibria of D-glucose and Sucrose in Mixed Solvent Mixtures: Comparison of UNIQUAC-based Models." ©1997 by Elsevier Science Ltd.
17. Based on Figure 1, which of the substances represented in Figure 1 is most likely a gas?
Your Answer is
Correct Answer is A
Explanation
General knowledge, the higher the temperature of the liquid, the stronger the molecular force, so the gas molecules are easy to overflow when they are heated and moved by themselves and under strong force; find the substance in Figure 1 whose solubility decreases as the temperature rises, which is A< /p>