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Question 7 2 pts In the lab, a student measures a teaspoon of an unknown liquid....
In the reaction of magnesium metal with hydrochloric acid: Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g)...
In the reaction of magnesium metal with hydrochloric acid: Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) What evidence of reaction would you see based on this balanced reaction? The solution cools down Solid formation Bubbles form in solution A color change In the lab, a student measures a teaspoon of an unknown liquid. The teaspoon of liquid has a mass of 6.84 g and a volume of 4.48 ml. How many teaspoons would be in 1.77 kg of this unknown...
Question 4 2 pts In lab, a student weighed out 1.576 g of unknown in a beaker. The student added ...
Question 4 2 pts In lab, a student weighed out 1.576 g of unknown in a beaker. The student added 58 mL DI water and followed the protocol in the lab to filter and dry the product, which had a final mass of 0.616 g. The filtrate was tested, and the student determined that CaCl2 2H2O was the limiting reactant. Determine the percent by mass composition of CaCl2 2H20 in the original unknown sample. Note: These numbers ate for calculation...
A student performed a series of measurements (volume/mass) of an unknown liquid in order to determine...
A student performed a series of measurements (volume/mass) of an unknown liquid in order to determine its density. Using a graduated cylinder, the student added an amount of unknown liquid to the graduated cylinder, then recorded the mass and volume of the liquid. The student repeated the process several times, adding more liquid each time and recording the mass and volume. The student plotted the data (mass on y-axis, volume on x-axis). The resulting data table and graph looked like...
A laboratory group measures an excess of an unknown liquid. They add this to an empty...
A laboratory group measures an excess of an unknown liquid. They add this to an empty flask for which they calculate the volume. They heat the sample in a water bath until all liquid has been vaporized for several minutes. the sample is cooled and measured. Use their laboratory data (listed below) to answer the following questions: Calculate the mol of gas in the flask using the ideal gas law: Calculate the molar mass of the unknown: If a student...
8 A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet....
8 A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of carbon tetrachloride, ethanolamine, tetrahydrofuran, pentane, and diethylamine. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density carbon tetrachloride 1.6...
In lab, an empty weigh boat measures 11.7 g. A piece of metal is added to...
In lab, an empty weigh boat measures 11.7 g. A piece of metal is added to the weigh boat, and the total mass increases to 19.5 g. A graduated cylinder is filled with 24.2 mL of water. The piece of metal is carefully added to the graduated cylinder, and the volume increases to 28.0 mL. Using this data, find the density of the piece of metal, in units of g/ml. Do not include units in your answer.
Student Name Course/Section Date Instructor PRE-LAB ASSIGNMENT 1. A sample of an unknown liquid is vaporized...
Student Name Course/Section Date Instructor PRE-LAB ASSIGNMENT 1. A sample of an unknown liquid is vaporized in a 255-mL flask in a hot water bath at 100.0 C. The atmospheric pressure is 748 torr and the vapor is found to have a mass of 0.714 grams. What is the molecular mass of the vapor? 2 A gas is found to be 85.7 % carbon and 14.3 % hydrogen by mass. Its molecular mass was found to be 98.1 g/mol using...
Pre-Lab Questions Name 1. At 25 °C, 10 0181 g of an unknown liquid has a...
Pre-Lab Questions Name 1. At 25 °C, 10 0181 g of an unknown liquid has a volume of6.75 mL a. Calculate the density b. Which of the following liquids was the unknown? water toluene chloroform Density, gmL at 25 ℃ 0.9982 0.8669 1.4832 If the unknown liquid had been water, what would the volume have been? c. d. What mass would a 10.00 mL sample of each of the other two liquids have been? Toluene Chloroform
In an attempt to identify a particular liquid unknown substance, you follow the procedures in this...
In an attempt to identify a particular liquid unknown substance, you follow the procedures in this experiment and obtain the following data… Solubility: s (in water); s (in cyclohexane); s (in ethyl alcohol) Density: A. Volume of liquid: 10.0 mL B. Mass of 50-mL Erlenmeyer flask plus liquid: 54.2066 g C. Mass of 50-mL Erlenmeyer flask: 40.4957 g Boiling Pt.: Observed boiling point: 59.5 °C; Barometric pressure: 650.0 mm Hg What is the mass (in g) of the liquid used...
Make sure that the following questions are answered in your submitted lab report. A student has...
Make sure that the following questions are answered in your submitted lab report. A student has an unknown liquid the theoretical density of which is 1.34 g/mL. He determines the experimental density of the liquid using the method described in the procedure for this experiment Tell whether each of the following errors would cause the experimental value of the density of the liquid to be too large, too small, or unchanged relative to the true value. Explain your reasoning in...
In the reaction of magnesium metal with hydrochloric acid: Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) What evidence of reaction would you see based on this balanced reaction? The solution cools down Solid formation Bubbles form in solution A color change In the lab, a student measures a teaspoon of an unknown liquid. The teaspoon of liquid has a mass of 6.84 g and a volume of 4.48 ml. How many teaspoons would be in 1.77 kg of this unknown...
Question 4 2 pts In lab, a student weighed out 1.576 g of unknown in a beaker. The student added 58 mL DI water and followed the protocol in the lab to filter and dry the product, which had a final mass of 0.616 g. The filtrate was tested, and the student determined that CaCl2 2H2O was the limiting reactant. Determine the percent by mass composition of CaCl2 2H20 in the original unknown sample. Note: These numbers ate for calculation...
A student performed a series of measurements (volume/mass) of an unknown liquid in order to determine its density. Using a graduated cylinder, the student added an amount of unknown liquid to the graduated cylinder, then recorded the mass and volume of the liquid. The student repeated the process several times, adding more liquid each time and recording the mass and volume. The student plotted the data (mass on y-axis, volume on x-axis). The resulting data table and graph looked like...
A laboratory group measures an excess of an unknown liquid. They add this to an empty flask for which they calculate the volume. They heat the sample in a water bath until all liquid has been vaporized for several minutes. the sample is cooled and measured. Use their laboratory data (listed below) to answer the following questions: Calculate the mol of gas in the flask using the ideal gas law: Calculate the molar mass of the unknown: If a student...
8 A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of carbon tetrachloride, ethanolamine, tetrahydrofuran, pentane, and diethylamine. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density carbon tetrachloride 1.6...
In lab, an empty weigh boat measures 11.7 g. A piece of metal is added to the weigh boat, and the total mass increases to 19.5 g. A graduated cylinder is filled with 24.2 mL of water. The piece of metal is carefully added to the graduated cylinder, and the volume increases to 28.0 mL. Using this data, find the density of the piece of metal, in units of g/ml. Do not include units in your answer.
Student Name Course/Section Date Instructor PRE-LAB ASSIGNMENT 1. A sample of an unknown liquid is vaporized in a 255-mL flask in a hot water bath at 100.0 C. The atmospheric pressure is 748 torr and the vapor is found to have a mass of 0.714 grams. What is the molecular mass of the vapor? 2 A gas is found to be 85.7 % carbon and 14.3 % hydrogen by mass. Its molecular mass was found to be 98.1 g/mol using...
Pre-Lab Questions Name 1. At 25 °C, 10 0181 g of an unknown liquid has a volume of6.75 mL a. Calculate the density b. Which of the following liquids was the unknown? water toluene chloroform Density, gmL at 25 ℃ 0.9982 0.8669 1.4832 If the unknown liquid had been water, what would the volume have been? c. d. What mass would a 10.00 mL sample of each of the other two liquids have been? Toluene Chloroform
Make sure that the following questions are answered in your submitted lab report. A student has an unknown liquid the theoretical density of which is 1.34 g/mL. He determines the experimental density of the liquid using the method described in the procedure for this experiment Tell whether each of the following errors would cause the experimental value of the density of the liquid to be too large, too small, or unchanged relative to the true value. Explain your reasoning in...
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