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A student observed the melting point of 4-methoxychalcone to be 63-70oC. Which of the following is (are) plausible explanation for this observation? Answer A. product was pure. B. product has small amount of side products. C. product was not dried completely before taking the melting point. D. product was very cold when the student started taking the melting point. E. product was not recrystallized successfully.
Given 100 g of hot tea at 90 C what mass of ice at -10 C must be added in order to obtain a final temperture of 10 C
A beaker contains 0.964 grams of nitrogen. How many moles of molecular nitrogen does the beaker contain?
what is the mass of iron in grams in the sample? a. 0.000904 g b. 0.0559 g c. 0.904 g d. 1.105 g e. 55.85 g
What is the molarity of the stock solution of luminol? What volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B)?
Transesterification of a certain triglyceride produced one molecule of methyl oleate and two molecules of methyl linoleate. Draw the original triglyceride.
Calculate the pH at the equivalence point for titrating 0.170 M solutions of each of the following bases with 0.170 M HBr. a)sodium hydroxide
write the net ionic equation for any precipitation reaction that may be predicted by the solubility rules on the
If 5.68 g of Cu was added to 3.18 g of S8, How much copper (I) sulfide would be produced?
When square brackets are placed around the formula for a substance, such as [NaOH], it indicates that we are working with the percent-by-mass
What molar ratio of benzoate ion to benzoic acid would be required to prepare a buffer with a pH of 5.20? [Ka(C6H5COOH) = 6.5 * 10-5]
Suppose that you titrate a 3 g sample of orange juice and it turns out to contain only 95.5mg of vitamin C. Further, it took 32.45mL of DCP solution to reach the end point of the titration.
When two atoms form a covalently-bonded diatomic molecule, the distance between the nuclei at which the potential energy is at a minimum is called
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