Sunscreen contains compounds that absorb ultraviolet light. Whensunscreen is applied to skin, it prevents ultraviolet light from reach-ing the skin. The graph that follows shows the absorbance of lightas a function of wavelength for two different compounds (2-EHMCand TDSA) common in sunscreen. Absorbance is a measure of theamount of light absorbed by the compound-the higher the absor-bance, the more light is absorbed. Study the graph and answer thequestions.0.6UV-EUV-A0.50.42-EHMC0.3TDSA0.20.1290 300 310 320 330 340 350 360 370 380 390 400Wavelength (nm)op.Why do you think sunscreens commonly contain both of thesecompounds and not just one of them?Absorba nce

Sunscreen is basically a lotion which we use that absorbs or reflects some of the harmful UV…

Answered: Sunscreen contains compounds that…

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter12: Chemical Bonding

Section: Chapter Questions

Problem 14CR

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The compound hexaazaisowurtzitane is one of the highest-energy explosives known (C E News, Jan. 17, 1994, p. 26). The compound, also known as CL-20, was first synthesized in 1987. The method of synthesis and detailed performance data are still classified because of CL-20s potential military application in rocket boosters and in warheads of smart weapons. The structure of CL-20 is In such shorthand structures, each point where lines meet represents a carbon atom. In addition, the hydrogens attached to the carbon atoms are omitted; each of the six carbon atoms has one hydrogen atom attached. Finally, assume that the two O atoms in the NO2 groups are attached to N with one single bond and one double bond. Three possible reactions for the explosive decomposition ofCL-20 are i. C6H6N12O12(s)6CO(g)+6N2(g)+3H2O(g)+32O2(g) ii. C6H6N12O12(s) 3CO(g) + 3CO2(g) + 6N2(g) + 3H2O(g) iii. C6H6N12O12(s) 6CO2(g) + 6N2(g) + 3H2 (g) a. Use bond energies to estimate E for these three reactions. b. Which of the above reactions releases the largest amount of energy per kilogram of CL-20?
Angelic acid, shown below, occurs in symbol root, a herb used as a stimulant. What is the maximum number of atoms that must lie in the same plane? a)5 b)4 c)8 d)6 e)2
An atom of rhodium (RhRh) has a diameter of about 2.7×10−8cm2.7×10−8cm.
Which of the following ions has the largest radius? Br- S2- B3+ Mg2+ Li+
Which of the following correctly ranks the ions Ca2+, S2–, K+, Cl–, and H+ in order of increasing size? A) Cl–< K+ < S2– < H+ < Ca2+ B) S2– < Ca2+ < K+ < Cl– < H+ C) H+ < Ca2+ < K+ < Cl– < S2– D) H+ < Cl– < Ca2+ < S2– < K+ E) H+ < S2– < Cl– < Ca2+ < K+
Give the systematic name for each of the following chemical compounds:(a) [Ni(OH2)4(OH)2](b) [HgClI](c) K4[Os(CN)6](d) [FeBrCl(en)2]Cl
Which of the following ions has the smallest size? (a) Cl- (b) F- (c) Al3+ (d) Na+
Item 5 Answer the following questions related to the chemical bonding in substances containing Cl. (a) What type of chemical bond is present in the Cl2 molecule? (b) Cl2 reacts with the element Sr to form an ionic compound. Based on periodic properties, identify a molecule, X2, that is likely to react with Sr in a way similar to how Cl2 reacts with Sr. Justify your choice. (c) A graph of potential energy versus internuclear distance for two Cl atoms is given below. On the same graph, carefully sketch a curve that corresponds to potential energy versus internuclear distance for two Br atoms. (d) In the box below, draw a complete Lewis electron-dot diagram for the C2Cl4 molecule. (e) Answer the following based on the diagram you drew above. (i) What is the hybridization of the CC atoms in C2Cl4? (ii) What is the approximate chlorine-carbon-chlorine bond angle in C2Cl4? (iii) Is the C2Cl4 molecule…
1-An atomic cation with a charge of +2 has the following electron configuration: [He] 2s22p4 What is the chemical symbol for the ion? How many electrons does the ion have? How many 2s electrons are in the ion? 2- Ammonium perchlorate (NH4ClO4) is powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen (N2) gas, chlorine (Cl2) gas, oxygen (O2) gas, and water vapor, releasing a great deal of energy. Calculate the moles of chlorine produced by the reaction of 0.90mol of ammonium perchlorate. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits. _____________ 3-How many protons and neutrons are in an atom of Th-229 ? Number of protons= ________ Number of neutrons= _______ 4- The chemical formula for beryllium sulfide is BeS. A chemist determined by measurements that 0.055 moles of beryllium sulfide…
Give the maximum number of electrons that can have n = 3 and ml = 0.
Percent absorbance of a particular wavelength of light in the soultion is 40%. Pb2+ ions is at the concentration is 4ppm, calculate the molarity. assume all the absorbance is due to Pb2+ ions. Density of water is 997kg/m^3 note a second point on the graph is (2,20) or (3,30)
1. Is NO2-1 polar, non polar, or ionic? 2. Why are titanium oxide features visible in the spectra of coolest stars only? Pls explain properly.

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