An atom of hellum has a radius e = 31. pm and an average speed in the gas phase at 25°C of 787.m/s. Suppose the speed of a helium atom at 25°C has been measured to within 0.010%. Calculate the smallest possible length of box inside of which the atom could be known to be located with certainty. Write your answer as a multiple of the and round it to 2 significant figures. For example, if the smallest box the atom could be in turns out to be 42.0 times the radius of an atom of helium, you would enter "42.He" as your answer.

True/False Indicate whether the statement is true or false. Write T if the statement is true while F if statement is false on the before each number 1.During inspection, the attributes and variable characteristics of a product is being compared against its specification to find out if the product is within the prescribed limits 2.Standard solutions of acids should be preserved in tightly stoppered bottle fitted with soda-lime tube to protect from carbon dioxide of the air 3.All burets should be tested for leakage prior to use A

1. Develop a detailed separation scheme for the separation and determination of the percent composition of your sample which will be a mixture of NaCl, NH.CL, and sand. You are expected to use the properties of the components listed below and some of the techniques listed in the table in the pre-lab queries (and used in Separations I). Keep in mind that any chemistry student should be able to pick up your scheme, understand it, and use it to complete the separation and calculation of % composition. Place the scheme on a separate sheet of paper. Component Solubility (@25°C) Melting Point Hardness sodium chloride, NaCl 35 g/100 mL water 801°C soft ammonium chloride, NH&Cl 37 g/100 mL water sublimes 350°C soft sand, SIQ2 insoluble 1600°C hard Example of compounds in a container. Naci NH.CI sio2 Exploring the Chemical World, PGCC, 2003 4 RESULTS Show all calculations with units in this space.

Please don't  provide handwritten solution .....  The average human body contains 5,830g of blood. What mass of arsenic is present in the body if the amount in blood is 0.55 ppm?

www-awn.aleks.com O MEASUREMENT Deducing the unit missing from the solution to a basic qu.. A student sets up and solves the following equation to solve a problem in solution stoichiometry Fill in the missing part of the student's equation. 1 kg (135D 103 1 mL 0.65 kg (0.48 L) 3 10 ? 1 X

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POST-QUESTIONS 1. After a student dissolved 0.5 g of white solid in water, she tested the conductivity and determined that the solution did not conduct electricity. The student then concluded: "when the white solid dissolved it 'just disappeared' so some sort of error must have been made because all solids are ionic compounds and, therefore, are electrolytes." Comment on the student's conclusion. Is her statement a valid conclusion? If so, identify what is correct. If not, write a conclusion that would be correct.

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Methenel Cacla The calcium carbonate sample is heated in the oven for 30 minutes, cooled, and then weighed. What could you do to ensure that the crucible and precipitate are dry? 2.