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11 May 2020, 00:03
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Dropdown 1: KI
Dropdown 2: KCIO3
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
59% (01:33) correct
41%
(01:40)
wrong
based on 1678
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The graph shows how the solubility of various chemicals varies with temperature. The solubility is measured as grams of dissolved chemical (solute) per 100 grams of water.
Under the assumption that the curves shown continue in the same general shape beyond the plotted area, use the drop-down menus to complete each of the following statements in the manner that most accurately reflects the information provided.
At 60°C, the most soluble of the chemicals is most likely .
There is most likely a temperature above 100°C at which NH4Cl is exactly as soluble as .
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Official Answer
Dropdown 1: KI
Dropdown 2: KCIO3
07 Apr 2021, 03:22
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Official Explanation
By following the gridline at 60°C, the visible line indicating the solubility of \(NaNO_{3}\) is highest on the graph. However, the line for KI extends above the scale shown on the graph. So, given the assumption that the curves continue in the same general shape beyond the plotted area, the information given indicates that KI is the most soluble at 60°C.
The correct answer is KI.
The vertical distance between the solubility curves for KClO3 and NH4Cl decreases as the temperature increases, thus the difference in solubility between KClO3 and NH4Cl decreases as the temperature increases. Assuming that the curves continue in the same general shape beyond the plotted area, the vertical distance between them will eventually be zero, thereby indicating that there is a temperature at which the two chemicals are equally soluble. By contrast, the solubility curves for KCl and NaCl have increasingly greater vertical distances from that of NH4Cl as the temperature increases. Thus the differences in the solubilities of either KCl or NaCl as compared to that of NH4Cl would continue to increase as the temperature increases.
The correct answer is KClO3.
By following the gridline at 60°C, the visible line indicating the solubility of \(NaNO_{3}\) is highest on the graph. However, the line for KI extends above the scale shown on the graph. So, given the assumption that the curves continue in the same general shape beyond the plotted area, the information given indicates that KI is the most soluble at 60°C.
The correct answer is KI.
The vertical distance between the solubility curves for KClO3 and NH4Cl decreases as the temperature increases, thus the difference in solubility between KClO3 and NH4Cl decreases as the temperature increases. Assuming that the curves continue in the same general shape beyond the plotted area, the vertical distance between them will eventually be zero, thereby indicating that there is a temperature at which the two chemicals are equally soluble. By contrast, the solubility curves for KCl and NaCl have increasingly greater vertical distances from that of NH4Cl as the temperature increases. Thus the differences in the solubilities of either KCl or NaCl as compared to that of NH4Cl would continue to increase as the temperature increases.
The correct answer is KClO3.
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11 May 2020, 00:23
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1. At 60°C, the most soluble of the chemicals is most likely_______________.
The solubility of different chemicals at 60°C when dissolved in 100 gms of water.
A. KCI - ~ 45gms/100gms
B. KI - ~ 190-200gms/100 gms, since if the graph extends in a similar manner as it is, it will go up, and at 60°C, it would point at some 190-210gms.
C. KNO3 ~ 108gm/100gm
D. NaNO3 ~ 141gm/100gm
E. SO2 ~ 5gm/100gms.
We can see from the above inference that KI is the most soluble of all the chemicals mentioned at 60°C.
Answer B.
2. There is most likely a temperature above 100°C at which NH4Cl is exactly as soluble as_______________.
If the graph for all the 3 is increased above 100°C, the following would increase in the order:
A. KCI - for a long list of temperatures above 100, KCI, would not increase above 70, since the graph will be a similar line its at 100°C.
B. KCIO3- it will increase and coincide with NH4Cl, soon above 100°C, b/w 90-100gm/100gm.
C. NaCI - will never coincide with NH4Cl, since the graph will a straight line after 100°C.
Answer B.
The solubility of different chemicals at 60°C when dissolved in 100 gms of water.
A. KCI - ~ 45gms/100gms
B. KI - ~ 190-200gms/100 gms, since if the graph extends in a similar manner as it is, it will go up, and at 60°C, it would point at some 190-210gms.
C. KNO3 ~ 108gm/100gm
D. NaNO3 ~ 141gm/100gm
E. SO2 ~ 5gm/100gms.
We can see from the above inference that KI is the most soluble of all the chemicals mentioned at 60°C.
Answer B.
2. There is most likely a temperature above 100°C at which NH4Cl is exactly as soluble as_______________.
If the graph for all the 3 is increased above 100°C, the following would increase in the order:
A. KCI - for a long list of temperatures above 100, KCI, would not increase above 70, since the graph will be a similar line its at 100°C.
B. KCIO3- it will increase and coincide with NH4Cl, soon above 100°C, b/w 90-100gm/100gm.
C. NaCI - will never coincide with NH4Cl, since the graph will a straight line after 100°C.
Answer B.
