Question 20. In another investigation the student added 100 g of each substance to 200 g of water at 60 °C. The substances did not react with each other. She filtered the mixture. The student then cooled the water to 20 °C and again filtered the mixture. What approximate mass of crystals would she collect in the second filter paper? 42 g В. 84 g C. 124 g D. 176 g А.

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Chapter1: Chemical Foundations
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please help with Question 20 only. thanks

The following two questions refer to the solubility of substances
Solubility of some substances
The graph shows how the solubility of
four substances changes as
temperature of the water changes.
the
100
Substance A
90
Substance B
Solubility is measured in grams per 100
grams of water. When the maximum
amount of substance has
dissolved, the solution is saturated, and,
if any more solid substance is added, it
forms a sediment.
80
70
been
60
Substance C
50
Substance D
40
30
20
10
10 20 30 40
50
60
70
Temperature of Water (°C)
Question 19.
A student stirred 50 g of one of the substances in 100 g of water at 30 °C. She found that all of the solid
dissolved. Which substance did the student use?
А.
Substance A
В.
Substance B
C. Substance C
D. Substance D
Question 20.
In another investigation the student added 100 g of each substance to 200 g of water at 60 °C. The substances
did not react with each other. She filtered the mixture. The student then cooled the water to 20 °C and again
filtered the mixture. What approximate mass of crystals would she collect in the second filter paper?
А.
42 g
B. 84 g
с.
124 g
D. 176 g
Solubility (Grams of substance per 100 grams
of water)
Transcribed Image Text:The following two questions refer to the solubility of substances Solubility of some substances The graph shows how the solubility of four substances changes as temperature of the water changes. the 100 Substance A 90 Substance B Solubility is measured in grams per 100 grams of water. When the maximum amount of substance has dissolved, the solution is saturated, and, if any more solid substance is added, it forms a sediment. 80 70 been 60 Substance C 50 Substance D 40 30 20 10 10 20 30 40 50 60 70 Temperature of Water (°C) Question 19. A student stirred 50 g of one of the substances in 100 g of water at 30 °C. She found that all of the solid dissolved. Which substance did the student use? А. Substance A В. Substance B C. Substance C D. Substance D Question 20. In another investigation the student added 100 g of each substance to 200 g of water at 60 °C. The substances did not react with each other. She filtered the mixture. The student then cooled the water to 20 °C and again filtered the mixture. What approximate mass of crystals would she collect in the second filter paper? А. 42 g B. 84 g с. 124 g D. 176 g Solubility (Grams of substance per 100 grams of water)
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