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Relative Molecular Mass & Mole Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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Question 1 1. What formula correctly identifies the binding of two monomers to make a heterodimer?

Question 2 2. A dimer is a molecule that defines the binding of how many monomers together?

Question 3 3. In the boiling-point elevation equation, what does m represent?

Question 4 4. A solution with a benzene solvent and hexane solute is found to have a delta T value of 0.5 degrees Celsius. If the boiling points of benzene and hexane are 80.1 and 68.5 degrees Celsius respectively, what is the boiling point of the solution?

Question 5 5. What are the factors that affect the rate of solution?

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Question 6 6. What is (are) the main factor(s) that affect solubility?

Question 7 7. Consider a mixture of two liquids: Liquid A and Liquid B. At room temperature, pure Liquid A has a vapor pressure of 1000 kPa and pure Liquid B has a vapor pressure of 500 kPa. 75% of the molecules in the mixture are Liquid A; the other 25% are Liquid B. Assuming that Raoult's Law applies, what is the vapor pressure of Liquid A in the mixture at room temperature?

Question 8 8. Use the Clausius-Clapeyron equation to determine the vapor pressure of a liquid at 30°C (303 K). The enthalpy of vaporization of this liquid is 83,140 J/mol, and its boiling point is 50°C (323 K). Keep in mind that at the boiling point the vapor pressure of a liquid is equal to the atmospheric pressure at sea level (1.0 atm).

Question 9 9. If we have 2 moles of sodium phosphate , what is its amount in grams? The molar mass of sodium phosphate is 163.94 g/mol.

Question 10 10. What is the molar mass of Na2CO3?

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Question 11 11. X and Y are elements that are isotopes to each other. Which of the following is true about X and Y?

Question 12 12. Magnesium has three common isotopes. Based on its average atomic mass, which is the most common?

Question 13 13. Which of the following mole ratio is NOT appropriate to the equation 6CO2+ 6H2 O → C6 H12 O6+ 6O2?

Question 14 14. Select the most suitable definition for stoichiometry.

Question 15 15. What is osmotic pressure?

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Question 16 16. What would happen to π if a 0.75 M sucrose solution was replaced with a 0.75 M NaCl solution?

Question 17 17.

What would be the freezing point of a 2 molality salt-vinegar solution:

Freezing point of vinegar: 17 degrees Celsius (290 K)

Cyroscopic constant of vinegar: 3.90

Question 18 18. How is the freezing point depression connected to salting icy roads?

Question 19 19. Which of the following best describes this molecular formula H2O? (Note the 2 is subscripted)

Question 20 20. Which of the following is a true statement when writing the molecular formula for an ionic compound?

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Question 21 21. The atomic mass of hydrogen is:

Question 22 22. Atomic mass is calculated by adding:

Question 23 23. While the process dissolving gas will change based on the solute and solvent, what is the general principle?

Question 24 24. What is the partial pressure of a gas?

Question 25 25. What is an electrolyte?

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Question 26 26. What is the equation used for determining molarity?

Question 27 27. You are building an electrochemical device and would like to use the weak acid HgCl2. When dissolved in solution, what will this weak electrolyte dissociate into?

Question 28 28. The compound pyridine, a weak base, is classified as a _____.

Question 29 29. What is osmotic pressure?

Question 30 30. What happens to vapor pressure when you add a solute to a solution?

Relative Molecular Mass & Mole Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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