Conservation of mass was discussed in the background. Describe how conservation of mass (actual, not theoretical) could be checked in the experiment performed.
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Conservation of mass was discussed in the background. Describe how conservation of mass (actual, not theoretical) could be checked in the experiment performed.
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- A student reacts 1.53 kg of magnesium metal with excess titanium(III) chloride solution. After the reaction was complete, the student had extracted 1.62 kg of titanium metal. From this data, calculate the percent error of this experiment.1. Several students performed this experiment without paying adequate attention to the details of the procedure. Briefly explain what effect each of the following procedural hanges would have on the size of the volume- to- temperature ratio calculated by the students. (a) One student failed to replenish the boiling water in the boiling- water bath as the flask was being heated. At the end of the 6 min of heating, the boiling water in the bath was only in contact with the lower portion of the flask. (b) Following the proper heating of the flask in the boiling water, a student removed the flask from the boiling- water bath but only partially immersed the flask in the ice-water bath during the cooling period. (c) A student neglected to close the pinch clamp before removing the flask from the boiling water bath and immersing it in the ice-water bath. (d) One student neglected to measure the volume of the flask before leaving the laboratory. Because the procedure called for a 125-mL…What are replicates in Analytical Chemistry? O The component of a sample that repeats over different assays. Similar assays done to different samples A sample that contains exactly the same amount of analytes than the original sample similar samples that are analyzed at the same time and in the same way
- How many mL of (5.0300x10^0) M NANO3 would be needed in a dilution experiment to make (8.56x10^2) mL of (2.3400x10^0) M NANO3? Enter your answer in scientific notation with 3 sig figs. Do not include any units in your answer. Do not round any intermediate calculations. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 AnswerWhat were the main results found in this experiment? Include both quantitative results (i.e. important calculated values, including percent error) and qualitative results (i.e. important properties that were investigated).What is meant by the statement Macroscopic observations have molecular causes? Give two examples.
- A sample was placed on a chromatography column. Methylene chloride was used as the eluting solvent. No separation of the components in the sample was observed. What must have been happening during this experiment? How would you change the experiment to overcome this problem?2. Why is performing multiple trials of an experiment a best practice in science? Ω x² X2Archimedes, a famous Greek scientist, was given a problem by King Hieron II of Syracuse (Sicily). The king suspected that his crown, which was supposed to be made of pure gold, contained some silver alloy, and he asked Archimedes to prove or disprove his suspicion. (It turned out that the crown did not contain silver.) How would you experimentally determined whether or not the crown was pure gold? (Hint: The method came to Archimedes when getting into a full bathtub. See the footnote in Experiment 22 for Archimedes’ solution.)
- 3. Imagine you performed this experiment at your own benchtop. You work hard to collect the data in the following table. Complete the calculations to fill in the rest of the table. Trial 1 Trial 2 Trial 3 Mass of Weighing Bottle & Sample (g) Mass of Weighing Bottle (g) 10.8732 9.0991 7.6855 10.7304 8.8761 7.5307 Mass of Sample (g) O.1428 0.223 15.2161 Mass of Filter 1.7121 1.9174 1.7305 Paper & AgCl (g) Mass of Filter 1.3322 1.3236 1.3210 Paper (g) Mass of AgCl 038 05938 04099 Moles of Cl (mol) Mass of CI' (g) Percent Cl 4. Calculate the average and the standard deviation of the three trials: Average Percent Cl %3D Standard deviation =Which statement is correct?Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture, if you can. • Sample A is 100. g of a coarse grey powder with a faint unpleasant smell. 15. g of the powder is put into a funnel lined with a sheet of thick paper. Distilled water is poured slowly over the powder. All of the powder disappears, and the water under the funnel turns a deep purple. • Sample B is a solid yellow cube with a total mass of 50.0 g. The cube is ground to a fine orange powder and added to a 500 mL beaker full of water. The beaker is stirred vigorously. Some of orange powder settles to the bottom of the beaker, and some rises to the top and floats on the water. When the powder at both the bottom and the top of the beaker is filtered out, dried, and weighed, the total mass is measured to be 50.1 g. pure substance Is sample A made from a pure substance or a mixture? If the description of the…
