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- 1. A sample of coal has the following composition by mass: 76% C, 8%H, 6%O, 4%N, 2%S, 4% ash Calculate HCV and LCV, in kcal/kg, using Dulong's formula.Can paper chromatographt be used to separate and identify very volatile substances? Explain.PART3-1ABORATORY FQUIEMENT FQUIPMENTNAME FUNCTION To hold test tubes. Attaches to a retort stand to support glassware being heated. To pour liquid from a large container into a small container. To provide a flame during an experiment. To light the Bunsen burner. To attach test tubes to a retort stand. To clean substances out of a test tube. To hold a hot crucible or flask. To hold a hot test tube. To place on the lab bench to prevent burning or to use with ring clamp. To transfer small amounts of liquid. To grow bacteria or contain small experiments. To hold liquids. To measure liquids. To contain experiments (a stopper can be used to close the flask). To hold a hot beaker. To perform an experiment with a different substance in each well. To hold chemicals and perform experiments in. To scoop and transfer small amounts of substances. To stir during experiments that involve mixing or dissolving.
- Chromatography can be used as a means to purify a reaction product or to analyze a reaction mixture. Group of answer choices True FalseTrituration is a process of reducing particle size which involves the addition of an appropriate solvent. Select one: True FalseAnalyze each statement (A and B) whether they are true or false. Use the choices below in answering each item; A statement A is true B statement B is true C both A and B are true D neither A nor B are true (A) A dispersing agent such as Na-hexametaphosphate is needed prior to soil textural analysis. (B) particles greater than 2.0 mm is included in the analysis of soil texture.
- Question 5 ( 1) Listen> Why should the syringe be removed from the sensor when setting the initial volume for each trial? So that each trial starts at the same pressure, atmospheric pressure. So that the syringe is not broken while setting the initial volume. O So that the initial volume may be set as accurately as possible. So that the sensor is not broken while setting the initial volume.k Mh1 = %3DG Unit 4 Test goformative.com/formatives/605a3bd6021bbe6342a71d44 OYouTube Maps 3 4 6. 7. 8. 10 11 12 13 14 15 16 17 18 19 20 21 9. Keyon and Jarred performed the following experiment: A piece of magnesium was placed on a watch glass; the watch glass and magnesium together weighed 2.00 g. They burned the magnesium and it produced bright light, smoke, heat and a white residue. They then weighed the white residue on the watch glass. Watch glass with residue weighed 2.25 g. From this information, they reached separate conclusions: 1 Keyon: The magnesium gained mass, but it was due to some type of problem with their measurements. Jerrod: The extra mass had to come from the oxygen in the air; burning something always means it combines with oxygen. Which student has the best explanation for the gain in weight and why? Keyon because the experiment should be done several times to make sure they are getting accurate measurements. Jerrod is correct because oxygen in the air added mass, by…
- b Answered x Co. How to Ca x N NSU Logir x PeriodicTa XM Action Rec X 0 mySigTau X G 4.25 ml to X NBA Final xG scientific c X + w.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-take [References] In 1897 the Swedish explorer Andreé tried to reach the North Pole in a balloon. The balloon was filled with hydrogen gas. The hydrogen gas was prepared from iron splints and diluted sulfuric acid. The reaction is Fe(s) +H2SO4 (ag) → FESO4(aq) + H2 (g) The volume of the balloon was 4800 m and the loss of hydrogen gas during filling was estimated at 20.%. What mass of iron splints and 98% (by mass) H2SO4 were needed to ensure the complete filling of the balloon? Assume a temperature of 0°C, a pressure of 1.0 atm during filling, and 100% yield. Mass of Fe = Mass of H2SO4 g Submit Answer Try Another Version 3 item attempts remaining Previous Next Email Instructor Save and Exit Cengage Learning | Cengage Technical SupportTrial Mass (g) 1 48.8839 2 49.0099 3 49.1121 4 48.9342 5 49.0338 6 48.7798 Calculate mean and standard deviation in the correct number of sigfigsA student wanted to determine the moisture content of a solid sample using gravimetric methods following the AOAC 930.15 method. The following data were obtained: mass of crucible (container): 24.6743 g initial mass of crucible and sample: 34.2134 g final mass of crucible and sample: 32.0567 g Calculate the %moisture of this sample. Show your entire solving process. You may upload a photo of your solution or you may just type it in.