The solubility of Cr1NO323 # 9 H2O in water is 208 g per 100 g of...
The solubility of Cr1NO323 # 9 H2O in water is 208 g per 100 g of water at 15 °C. A solution of Cr1NO323 # 9 H2O in water at 35 °C is formed by dissolving 324 g in 100 g of water. When this solution is slowly cooled to 15 °C, no precipitate forms.
You take a metal spatula and scratch the side of the glass vessel that contains this cooled solution, and crystals start to appear. What has just happened? Select all that apply.
a. The reaction is exothermic and causes the formation of ice crystals.
b. Scratching the glass creates nucleation sites.
c. The excess chromium nitrate is crystallizing out.
d. The reaction is endothermic and causes the formation of ice crystals.
Homework Answers
The correct options are :
(b.) Scratching the glass creates nucleation sites.
(c.) The excess chromium nitrate is crystallizing out.
When the given solution is slowly cooled to 15oC, then it becomes supersaturated and scratching the glass creates nucleation sites and crystals start to form. The excess chromium nitrate crystallizes out
Add Answer to:
The solubility of Cr1NO323 # 9 H2O in water is 208 g per 100 g
of...
Given the solubility of benzoic acid in water is: 0.68 g/100 mL a 100 °C, and...
Given the solubility of benzoic acid in water is: 0.68 g/100 mL @ 100 °C, and 0.34 g/100 mL at 25 °C. Calculate: a) Volume (mL) of water needed to dissolve 100 mg of benzoic acid at 100 °C. b) Weight of benzoic (mg) acid that remain soluble when the solution in part (a) is cooled to 25 °C. c) Recovery % of benzoic acid crystals that can be collected when the solution in part (a) is cooled to 25 °C.
A.) Classify reaction as exothermic or endothermic. Gas burning in a Bunsen burner: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)+2044kJ B.) Give...
A.) Classify reaction as exothermic or endothermic. Gas burning in a Bunsen burner: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)+2044kJ B.) Give ΔH for reaction above. C.) Classify reaction as exothermic or endothermic. Dehydratation hydroxide: Co(OH)2(s)+16kJ→CoO(s)+H2O(l) D.) Give ΔH for reaction above. E.) Classify reaction as exothermic or endothermic. Formation of aluminum oxide and chromium from aluminum and chromium (III) oxide: 2Al(s)+Cr2O3(s)→Al2O3(s)+2Cr(s)+536kJ F.) Give ΔH for reaction above.
a) Use Hess's law to calculate the enthalpy change for the reaction: 3C(s) + 4H2(g) +...
a) Use Hess's law to calculate the enthalpy change for the reaction: 3C(s) + 4H2(g) + ½O2(g) → C3H8O(l) Given the following thermochemical equations: 2C3H8O(l) + 9O2(g) → 6CO2(g) + 8H2O(l) ΔH = -4042.6 kJ/mol C(s) + O2(g) → CO2(g) ΔH = -393.51 kJ/mol H2(g) + ½O2(g) → H2O(l) ΔH = -285.83 kJ/mol (in kJ/mol) A: -267.7 B: -302.6 C: -341.9 D: -386.3 E: -436.5 F: -493.3 G: -557.4 H: -629.9 b) Define if the following statement is an endothermic process or exothermic...
15. A solution reaction that involves dissolving KBr in water in a calorimeter causes the temperature of the to dec...
15. A solution reaction that involves dissolving KBr in water in a calorimeter causes the temperature of the to decrease from 21 °C to 18 °C. This reaction is Isothermal Specific Exothermic Endothermic
G. C. 2-7 Studying the Effect of Changes in Conditions on an Equilibrium System 57 System...
G. C. 2-7 Studying the Effect of Changes in Conditions on an Equilibrium System 57 System No. 4: [Co(H0).J? + 4C 5 [CoCLIC + 6H,0 Solutions Observations Dissolved CoCl-6H,0 - Pink solution Solution plus HCI Blue Solution Heated solution Blue Solution Cooled solution Pink Solutam 9. According to the equilibrium equation, which ion(s) do you have after the solid was diluted? Explain how you know the identity of the ion(s) present. 10. Explain what happened when HCl was added to...
After fully dissolving an impure compound in 100 mL of hot ether, the solution was cooled...
After fully dissolving an impure compound in 100 mL of hot ether, the solution was cooled and put on ice, but no crystals formed. option as the next step to take in the recrystallization procedure in order to obtain pure crystalline material. O A. Remove 60% of the solution by pouring it from the flask. Reheat the solution, cool, and put on ice. O B. Add an additional 25 mL of ether to the solution while on ice. O C....
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of...
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of H, are reacted? N; (g) + 3H2(g) → 2NH, (g): AH = -91.2 kJ (A) -452 kJ (B) +452 kJ (C) -151 kJ (D) -1357 kJ 11. Which of the following is NOT a state function? 1. Heat 2. Change in enthalpy 3. Change in internal energy 4. Change in pressure (A) 1 only (B) 2 only (C) 2 and 3 (D) 1 and...
10. How many grams of H2O(8) are produc S of H2O(g) are produced at the same...
10. How many grams of H2O(8) are produc S of H2O(g) are produced at the same time that 45 kJ of energy are produced? Is this an endothermic or an exothermic reaction? Explain. equation is: mie reaction? Explain. The thermochemical 2C4H10(g) + 1302(g) + SCO(g) + TOHO(g) +5.77 x 103 kJ 11. In the following reaction, which species are reduced and what is the reducing agent? 2C4H10(g) + 1302(g) - 8C02(g) + 10H2O(g) +5.77 x 103 kJ 12. In the...
5. The solubility of KCl (in grams KCl/100 g of water) is 31.0 g at 10.0...
5. The solubility of KCl (in grams KCl/100 g of water) is 31.0 g at 10.0 °C, 34.0 g at 20.0 °C, 42.6 g at 50.0 °C, and 56.7 at 100 °C. a) You want to make a saturated solution of KCl at 50.0 °C using 2.00 L of water. How many grams of KCl are necessary to make this solution? You may assume that the density of water is 1.00 g/mL. b) You then take your saturated solution of...
The solubility of adipic acid in water is 1.40 g/ 100 mL at 10 C, and...
The solubility of adipic acid in water is 1.40 g/ 100 mL at 10 C, and 160 g/ 100 mL at 100 C. A. If 0.950 g of adipic acid is dissolved in 3.00 mL of boiling water and cooled to 10 C. Calculate the maximum mass of adipic acid that could crystallize from the solution. B. What is the maximum amount of adipic acid that could dissolve in 3.00 mL of boiling water?
15. A solution reaction that involves dissolving KBr in water in a calorimeter causes the temperature of the to decrease from 21 °C to 18 °C. This reaction is Isothermal Specific Exothermic Endothermic
G. C. 2-7 Studying the Effect of Changes in Conditions on an Equilibrium System 57 System No. 4: [Co(H0).J? + 4C 5 [CoCLIC + 6H,0 Solutions Observations Dissolved CoCl-6H,0 - Pink solution Solution plus HCI Blue Solution Heated solution Blue Solution Cooled solution Pink Solutam 9. According to the equilibrium equation, which ion(s) do you have after the solid was diluted? Explain how you know the identity of the ion(s) present. 10. Explain what happened when HCl was added to...
After fully dissolving an impure compound in 100 mL of hot ether, the solution was cooled and put on ice, but no crystals formed. option as the next step to take in the recrystallization procedure in order to obtain pure crystalline material. O A. Remove 60% of the solution by pouring it from the flask. Reheat the solution, cool, and put on ice. O B. Add an additional 25 mL of ether to the solution while on ice. O C....
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of H, are reacted? N; (g) + 3H2(g) → 2NH, (g): AH = -91.2 kJ (A) -452 kJ (B) +452 kJ (C) -151 kJ (D) -1357 kJ 11. Which of the following is NOT a state function? 1. Heat 2. Change in enthalpy 3. Change in internal energy 4. Change in pressure (A) 1 only (B) 2 only (C) 2 and 3 (D) 1 and...
10. How many grams of H2O(8) are produc S of H2O(g) are produced at the same time that 45 kJ of energy are produced? Is this an endothermic or an exothermic reaction? Explain. equation is: mie reaction? Explain. The thermochemical 2C4H10(g) + 1302(g) + SCO(g) + TOHO(g) +5.77 x 103 kJ 11. In the following reaction, which species are reduced and what is the reducing agent? 2C4H10(g) + 1302(g) - 8C02(g) + 10H2O(g) +5.77 x 103 kJ 12. In the...
Most questions answered within 3 hours.
-
what would be the best entry mode in shipping from the U.S to Spain
by boat...
asked 26 seconds ago -
Under certain conditions, the substance ammonium
nitrate can be broken down to form dinitrogen
monoxide and...
asked 1 minute ago -
1. A boy stands on one end of a boat, and then walks to the
other...
asked 11 minutes ago -
Casey is on trial under criminal allegations that she engaged in
fraudulent behavior at the company...
asked 16 minutes ago -
Surplus Styles is a manufacturer of hair care products,
including shampoos, conditioners, and hair gels. The...
asked 15 minutes ago -
Using an income-expenditure diagram, use the infinite line and
double-drop line tools to show the economy...
asked 23 minutes ago -
Which expression computes a pseudorandom integer between -10 and
10 using rand()
from cstdlib?
A. (rand(...
asked 30 minutes ago -
Roybus, Inc., a manufacturer of flash memory, just reported that
its main production facility in Taiwan...
asked 38 minutes ago -
Two capacitors connected in parallel produce an equivalent
capacitance of 45.0 μF but when connected in...
asked 47 minutes ago -
The differences between the two sets of dependent data are -1,
2,-,2, 2. Round to the...
asked 1 hour ago -
A χ2-curve, looking at the relationship between age and hours
spent working at an office per...
asked 1 hour ago -
The pH of a sample of water from a river is 5.0. A
sample of effluent from...
asked 2 hours ago