Gravimetric Analysis Pre-Lab Quiz

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Arizona State University, Tempe *

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113

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Chemistry

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Feb 20, 2024

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Question 1 0.5/0.5pts — Which of the following is NOT a type of data gathered in quantitative analysis? color CORRECT! Color is qualitative data. Question 2 0.5/0.5pts Gravimetric analysis is a method that could be used to determine which of the following? The number of moles of calcium nitrate in a solution sample CORRECT! Gravimetric analysis is a common method used in quantitative analytical chemistry to determine the amount of an ion or an analyte through precipitation and separation of a solid.

Question 3 0.5/0.5 pts What is the process in which a solid separates from a solution called? Precipitation CORRECT! Question 4 0.5/0.5pts The reaction below: AgNO;3 (aq) + NaCl (aq) — AgCl (s) + NaNO3 (aq) is an example of what type of reaction? Double displacement CORRECT!

0.5/0.5pts Question 5 Gravimetric analysis often involves hygroscopic compounds. What are hygroscopic compounds? Compounds that adsorb water molecules from the atmosphere to become hydrated CORRECT! Question 6 0.5/0.5pts "Laughing gas" (or dinitrogen monoxide) is produced from nitrogen gas and oxygen gas according to the reaction below: 2N, (9) + 02 (9) — 2N:0 (g) If 50.0 g of nitrogen gas is allowed to react with 25.0 g of oxygen gas, what is the limiting reactant? 0, CORRECT!

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Question 7 0.5/0.5pts “Laughing gas" (or dinitrogen monoxide) is produced from nitrogen gas and oxygen gas according to the reaction below: 2N: (9) + 02 (9) — 2MN:20 (g) If 50.0 g of nitrogen gas is allowed to react with 25.0 g of oxygen gas, what is the theoretical yield of dinitrogen monoxide? 68.8¢9 CORRECT! Question 8 0.5/0.5pts What is meant by the expression “percent yield of a reaction"? A way to calculate the efficiency of a reaction CORRECT!

Question 9 0.5/0.5pts "Laughing gas" (or dinitrogen monoxide) is produced from nitrogen gas and oxygen gas according to the reaction below: 2Nz (9) + 02 (9) — 220 (g) Assuming only 40.3 g of N,0 is produced when 50.0 g of nitrogen gas reacted with 75.0 g of oxygen gas, what is the percent yield of the reaction? 51.3% CORRECT! Question 10 0.5/0.5pts This procedure requires you to let the product sit for a period of 24 hours. Are you going to start the procedure before Tuesday to allow yourself enough time to complete both the experiment and the post-lab before it is due on Wednesday? (Hint: The answer is YES!) Yes Good plan!

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