Homework Answers
Volume measurement is likely to be done with more precision. Here, you may expect only Paralax error but which can be avoided if we see the meniscus from the bottom.
But, mass determination deal with many errors like man-made and instrumental error which results in less precision.
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Why is volume more precise?
Given your experience in mass determinations (Experiment 1) and with volumetric...
no Design a simple experiment to determine which type of volumetric glassware is the most accurate...
no Design a simple experiment to determine which type of volumetric glassware is the most accurate and the most precise at delivering a given volume. Your experiment must incorporate the following materials: analytical balance, distilled water, and a separate beaker used for mass measurements. Hint: Design your experiment around a physical property of water. (3) Be sure to explain which calculations you will perform in your experiment to determine accuracy and precision. (2)
1. What do volumetric glassware measure? What types of volumetric glassware will you be using in...
1. What do volumetric glassware measure? What types of volumetric glassware will you be using in this experiment? 2. What is density? How is it calculated? 3.Define meniscus. State how you use the meniscus in making volumetric measurements. Draw a sketch of a meniscus for water in a graduated cylinder. 4. Define accuracy and precision. Explain what the “reliability of a measurement” means. (These concepts can be found in Chapter 1 of your text.) 5. Why will you calculate accurate...
Recycling Al experiment Mass of Al : 0.49g Mass of KAl(SO4)2 12H2O synthesized: 2.86g 1. Assuming...
Recycling Al experiment Mass of Al : 0.49g Mass of KAl(SO4)2 12H2O synthesized: 2.86g 1. Assuming you started with pure aluminium scrap, calculate the theoretical mass of the precipitate, alum. Include a balanced net ionic equation for the formation of the product from Al3+. 2. Calculate your percent yield. 3. If you had a large number amount of impurities in the scrap aluminium, what would be the impact in the percent yield calculation? explain. 4. In this experiment volume of...
1. An experiment is performed in the lab, where the mass and the volume of an...
1. An experiment is performed in the lab, where the mass and the volume of an object are measured to determine its density. Two completely different valid methods are used. Each experimental method to measure the density is performed, two considerable sets of data are taken on each and the results are compared. The results of the density measurement by each method should be ... a. dependent on the mass and the volume of the object b. completely different, because...
Experiment Quantitative Titration - Part 1: Standardization of Sodium Hydroxide Solution Concentration of HCL standard solution...
Experiment Quantitative Titration - Part 1: Standardization of Sodium Hydroxide Solution Concentration of HCL standard solution / mol L^-1 = 0.09745 Volume of HCL solution / mL = 25 Indicator: Bromothymol Blue Average Volume of NaOH / mL = 24.35 Please find concentration of NaOH / mol^-1 Part 2 - Determination of the concentration of acetic acid Volume of Acedic Acid Solution / mL = 10 Indicator: Phenolphthalein Average Volume of NaOH / mL = 30.94 Please find the concentration...
23.40245 What's the proper way to report (write) the reading shown in the analytical balance shown in t...
23.40245 What's the proper way to report (write) the reading shown in the analytical balance shown in the figure A) 23.402 B) 23.40245 C) 23.4025 D) 23.4 E) Any of the answers A-D are valid answers. How would you notate (write) the amount of fluid delivered from the "fill line" of the volumetric pipette shown in the figure, if the following markings are on the pipette: 25 mL +/- .02 mL TD at 25 C A) 25.00 mL B) 25.0...
Two methods were descibed for determining the volume of the flask used for the molar mass...
Two methods were descibed for determining the volume of the
flask used for the molar mass determination. Which method will give
a more precise determination of the volume? Why?
When two acceptable determinations of the weight of vapor needed to fill the flask have been obtained, remove the foil cover from the flask (do not discard) and clean out the flask. Fill the flask to the very rim with tap water, cover with the foil cover, and weigh the flask,...
2. Why should all of the glassware and the magnesium used for the preparation of the...
2. Why should all of the glassware and the magnesium used for the preparation of the Grignard reagent be any 3. What is the role of the anhydrous calcium chloride used in this experiment? 4. Calculate the theoretical yield (in g) of diphenylmethanol in this experiment. Show your work. Bp, ("C) Mp, (°C) Mass mmol Molecular Weight Calmo 157.02 density (g/ml) Volume (mL) bromobenzene 1560 2.7 17.2 benzaldehyde 1.50 .04 106.12 | 178. 1 1 11.56 1.5 14.7 magnesium 0.4...
chemistry density Density 1. Explain why a highly precise measurement does not always means a highly...
chemistry density
Density 1. Explain why a highly precise measurement does not always means a highly accurate one. 2. Read the volume in the diagram below. Report your answer in the line, including the correct number of significant figures 60 50 mL Answer: 3. Why is the density of a substance independent on sample size? 4. Ahmed obtains a silvery metallic unknown. She masses the metal and finds that she has 60.56g. When she places the metal in a graduated...
1. Given the initial and final volumes of the experiment, determine the initial mass of the...
1. Given the initial and final volumes of the experiment, determine the initial mass of the water and the mass of the ice cube. Show your work. Record your answer in the table above. initial temp of water before ice 28 deg C final temp after ice cube melts 2 deg C initial volume 70mL final volume after ice melts 95mL mass of water = 70mL = 70mg = 0.07g using energy conservation Q = mw(cw)(delta T) How do i...
no Design a simple experiment to determine which type of volumetric glassware is the most accurate and the most precise at delivering a given volume. Your experiment must incorporate the following materials: analytical balance, distilled water, and a separate beaker used for mass measurements. Hint: Design your experiment around a physical property of water. (3) Be sure to explain which calculations you will perform in your experiment to determine accuracy and precision. (2)
23.40245 What's the proper way to report (write) the reading shown in the analytical balance shown in the figure A) 23.402 B) 23.40245 C) 23.4025 D) 23.4 E) Any of the answers A-D are valid answers. How would you notate (write) the amount of fluid delivered from the "fill line" of the volumetric pipette shown in the figure, if the following markings are on the pipette: 25 mL +/- .02 mL TD at 25 C A) 25.00 mL B) 25.0...
Two methods were descibed for determining the volume of the
flask used for the molar mass determination. Which method will give
a more precise determination of the volume? Why?
When two acceptable determinations of the weight of vapor needed to fill the flask have been obtained, remove the foil cover from the flask (do not discard) and clean out the flask. Fill the flask to the very rim with tap water, cover with the foil cover, and weigh the flask,...
2. Why should all of the glassware and the magnesium used for the preparation of the Grignard reagent be any 3. What is the role of the anhydrous calcium chloride used in this experiment? 4. Calculate the theoretical yield (in g) of diphenylmethanol in this experiment. Show your work. Bp, ("C) Mp, (°C) Mass mmol Molecular Weight Calmo 157.02 density (g/ml) Volume (mL) bromobenzene 1560 2.7 17.2 benzaldehyde 1.50 .04 106.12 | 178. 1 1 11.56 1.5 14.7 magnesium 0.4...
chemistry density
Density 1. Explain why a highly precise measurement does not always means a highly accurate one. 2. Read the volume in the diagram below. Report your answer in the line, including the correct number of significant figures 60 50 mL Answer: 3. Why is the density of a substance independent on sample size? 4. Ahmed obtains a silvery metallic unknown. She masses the metal and finds that she has 60.56g. When she places the metal in a graduated...
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