21. Renée wants to measure the speed of the next reaction. Suggest 2 methods she could use. Explain why. Mg (s) + 2HCI (aq) → MgCl2 (aq) + H2 (g)
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- Some antacids are used by dropping a tablet into a glass of water, which results in significant fizzing, and then drinking the water. Is there any evidence to suggest there might be a chemical reaction involved? What is the evidence?(I) Why the physicochemical changes in liquid water caused by radiation is the key to understanding the biological effects of radiation? Please give a short, one-sentence explanation. (II) Name the three key stages of the physicochemical changes produced in liquid water due to radiation. (III) Briefly describe the three key stages. A one- or two-sentence explanation for each of the three key stages would be sufficient.8. What are the products obtained when coconut oil is heated with NaOH? Coconut oil + NaOH → ? + ?
- 2(a) Briefly explain how the protein test for dairy products was cheated by the adulteration of the products with melamine. 2(b) Briefly explain why occasionally it was found that some fresh seafood sellers treated the seafood products with formaldehyde solution.1. a. Explain why the melting point of palmitic acid (16 carbons, no double bonds) is slightly lower thanthat of stearic acid (18 carbons, no double bonds). Explain why the melting point of oleic acid (18carbons, one double bond) is lower than that of stearic acid b. A mixture of lipids containing phosphatidic acid, cholesterol, testosterone, phosphatidylserine, andphosphatidylethanolamine was applied to a hydrophobic interaction chromatography column. Thecolumn was washed with a high salt buffer, and the lipids were then eluted with decreasing saltconcentrations. In what order would the lipids be eluted from the column? Explain your answer.Define Casparian strip
- 1. Encircle the chiral carbons in the given structures. 2. Identify which structures are D and L series.1. Give two examples of reflection symmetry and radial symmetry in nature. 2. Write the first 20 Fibonacci numbers1. Why ninhydrin is used in paper chromatography? 2. How do you identify amino acids on the chromatogram?
- 5. In the Chemical Changes experiment (E3) on copper, which of the steps can be omitted if our goal is only to obtain dry copper(II) oxide solid? a. Decanting and adding sulfuric acid to dissolve black precipitate b. Addition of NaOH to Cu(NO3)2 solution c. Filtering and heating until dry and fully black d. Boiling of previous solution until black(a) A blackish brown solid ‘A’ when forced with alkali metal hydroxide in presence of air, produces a dark green coloured compound ‘B’, which on electrolytic oxidation in alkaline medium gives a dark purple coloured compound ‘C’. Identify A, B, C and write the reactions involved. What happens when an acid solution of green coloured compound (B) is allowed to stand for some time. (b) (i) Calculate the spin magnetic moment of M2+(aq) ion. Atomic number (Z) = 27. (ii) Chromium is typical hard metal while mercury in liquid, explain.The magnesium electron spectrum has a line at 266.8 nm. Does it have a greater speed in a vacuum (an area without an atom or particle) than does red light with a wavelength of 652 nm? Why or why not?
