I am out of town on business, returning to the office on Friday, February 20th. If you need to reach me right away, call my cell phone at 914.

Sorry, but we do not understand what your question is.

By definition, 1 carat is exactly 200 milligrams. Since most diamonds sold in the jewelry industry weigh less than 1 carat, the carat is usually subdivided into "points." There are 100 points in 1 carat, so that a diamond weighing 3/4 carat would be a "75 point diamond. In summary: 1 carat = 200 milligrams = 100 points Don`t confuse the weight of a stone and its size. This argument is similar to that of cereal boxes or potato chips, where "contents are sold by weight, not volume." Also, don`t confuse the carats of a diamond with the carats of a different stone. Because different minerals have different densities, a 1-carat diamond will have a different volume (a.k.a. size) than, say, a 1-carat ruby. Another common source of confusion: The karats used to measure the purity of gold have nothing to do with the carats used to measure the weight of a diamond. Notice the difference in spelling. Carat Size: I/4 Carat = 4.1 mm 1/3 Carat = 4.4 mm 1/2 Carat = 5.2 mm 3/4 Carat = 5.9 mm 1 Carat = 6.5 mm

Powered by

Im doing an open book chemistry i exam, i got a 60/200 first then a 30/200, dont ask. would anybody like to give it a try i would really appreciate it. question 1 10 points save e20031120 mdj01: the total kinetic energy for the particles composing an ideal gas is the same as for that of a van der waals gas. true false question 2 10 points save kt12043: what is the chemical formula of a gas if it exerts a pressure 680 torr at 27.0°c and has a density of 1.82 g/l at this same temperature? c2h6 co2 no f2 cf4 question 3 10 points save e20031120 11: what is the pressure in a gas container that is connected to an open-end u-tube manometer if the pressure of the atmosphere is 772 torr and the level of mercury in the arm connect to the container is 8.60 cm higher than the level of mercury open to the atmosphere? 8.98 mm hg 686 mm hg 763 mm hg 858 mm hg question 4 10 points save e20031120 23: a balloon filled with helium gas at 20°c occupies 2.91 l at 1.00 atm. the balloon is immersed in liquid nitrogen at -196°c which applies an external prssure of 5.20 atm to it. what is the volume of the balloon in the liquid nitrogen? 0.15 l 0.28 l 2.1 l 6.8 l question 5 10 points save e20031120 27: how many molecules of nitrogen gas are in a 500 ml container at 780 mm hg and 135°c? 8.76 x 1021 9.23 x 1021 18.4 x 1021 27.9 x 1021 question 6 10 points save e20031120 69: an unknown gas effuses 1.73 times faster than krypton. what is the molar mass of the gas (g/mol)? 28.0 48.4 110 251 question 7 10 points save e20031120 eb0503: a 3.0 l flask with 1.5 atm pressure inside is connected to a 2.00 l flask with 1.00 atm internal pressure. the stopcock connecting the two flasks is opened and the gases mix. what is the final pressure assuming that the connecting tubes are part of the original volume? 0.900 atm 1.25 atm 1.30 atm 2.25 atm question 8 10 points save e20031120 17: an approximation of absolute zero was made from an extrapolation of p vs. 1/v v vs. t n vs. v v vs. 1/t question 9 10 points save e20031120 53: the ozone molecules in the stratosphere absorb much of the ultraviolet radiation from the sun, protecting life on earth. at a certain altitude, the temperature of the stratosphere is 240k and the partial pressure of ozone is 1.4 x 10-7 atm. calculate the number of ozone molecules present in 1.00 l of atmosphere at that altitude. 2.1 x 1015 4.3 x 1015 8.0 x 1019 1.8 x 1032 question 10 10 points save e20031120 61: which of the following gases has the lowest average speed at 25°c? methane dihydrogen sulfide ammonia oxygen question 11 10 points save e20031043: from the plot of vapor pressure (in mm hg) as a function of temperature shown in the diagram in the attached link (please click), in the range 0°c to 100°c, the vapor pressure of t-butanol approximately doubles every mf10041 bp diagram.jpg 5°c. 10°c. 20°c. 40°c. question 12 10 points save e20031044: match each of the solid substances at the left with the best description of its crystal structure (or lack thereof) to the right. - a. b. c. d. e. cao - a. b. c. d. e. au - a. b. c. d. e. coal - a. b. c. d. e. diamond - a. b. c. d. e. sucrose (c12h22o11) - a. b. c. d. e. quartz (sio2) - a. b. c. d. e. nacl - a. b. c. d. e. glass a. ionic solid b. network covalent solid (crystalline) c. molecular solid d. metallic solid e. amorphous solid question 13 10 points save e20031056: iron crystallizes in a body-centered cubic cell having an edge length of 287 pm. what is the density of iron in g/cm3? 1.99 7.85 11.9 15.9 question 14 10 points save e20031084: a substance is heated at a pressure lower than the triple-point pressure. what phase change, if any, could occur? transgression sublimation deposition vaporization melting question 15 10 points save e2003109x: refer to the linked diagram before proceeding further. along the path a-b-g-d which of the following statements best says what happens? generic phase diagram for several problems 40.jpg the substance goes from pure gas to pure liquid with a noticeable phase change. the substance is a critical fluid throughout the entire path. the substance changes from pure gas to pure liquid but at no point is a phase change observed. the substance is rendered opaque as the path passes over the critical point. none of the above statements is true. question 16 10 points save e20031078: refer to the linked diagram before doing this problem. place a check mark by all phase changes which occur if the temperature is held constant at 140°c and the pressure is increased from 0.25 atm to 1.4 atm. generic phase diagram for several problems 40.jpg gas to solid solid to gas gas to liquid liquid to gas liquid to solid solid to liquid no phase changes occur. question 17 10 points save e20031049: molten magnesium crystallizes when it cools. what type of solid is formed? covalent network ionic metallic molecular question 18 10 points save e20031080: refer to the linked diagram before doing this problem. check all the statements below which are true. generic phase diagram for several problems 40.jpg the minimum pressure at which this substance can have a liquid phase is c. the maximum pressure for existence of the liquid phase is at point b. the maximum pressure for existence of the liquid phase is at point d. the triple point is the minimum pressure at which the liquid phase can exist. none of the above is true. question 19 10 points save e20031039: hg is very useful in barometers but hg vapor is quite toxic. given that hg has an enthalpy of vaporization of 56.9 kj/mol and that its normal boiling point is 356.7°c, what is the vapor pressure in torr at room temperature, 25°c? 0.00429 2.36 62.8 751 question 20 10 points save e20031010: which of the following compounds exhibits hydrogen bonding? ch3cl hi h3c-o-ch3 nh3 question 21 10 points save e200302 072: look at the attached link and then tell us which electron dot structure for hydrazine is the most acceptable. look at the link, determine your answer, return to the exam, and answer the question. 072.jpg a b c d none of these is really appropriate. question 22 10 points save e200302 066: place a check mark by all electrostatic forces which hold atoms together in a molecule. electron-electron forces electron-nucleus forces nucleus-nucleus forces all or none of these. question 23 10 points save e200302 078: match each of the molecules below with what best describes its molecular structure. - a. b. c. d. e. f. g. h. i. j. k. l. boron trichloride - a. b. c. d. e. f. g. h. i. j. k. l. the nitrous ion - a. b. c. d. e. f. g. h. i. j. k. l. dihydrogen sulfide - a. b. c. d. e. f. g. h. i. j. k. l. phosphine (ph3) - a. b. c. d. e. f. g. h. i. j. k. l. carbon tetrachloride (ccl4: proper name is "tetrachloromethane.") - a. b. c. d. e. f. g. h. i. j. k. l. phosphorus pentafluoride - a. b. c. d. e. f. g. h. i. j. k. l. sulfur tetrachloride - a. b. c. d. e. f. g. h. i. j. k. l. bromine trifluoride - a. b. c. d. e. f. g. h. i. j. k. l. xenon difluoride - a. b. c. d. e. f. g. h. i. j. k. l. bromide pentafluoride - a. b. c. d. e. f. g. h. i. j. k. l. xenon tetrafluoride - a. b. c. d. e. f. g. h. i. j. k. l. sulfur hexafluoride a. bent b. linear c. trigonal planar d. trigonal pyramidal e. trigonal bipyramidal f. t-shaped (also often called "bent-t") g. square pyramidal h. square planar i. see-saw j. octahedral k. tetrahedral l. square antiprism question 24 10 points save e200302 077: which should have the most resonance structures? ozone sulfur dioxide the nitrous anion. methane (ch4) benzene all these have the same number of resonance structures. question 25 10 points save e200302 092: which is the best representation of the lowest p mo of no2-? (see attached link for the various depictions and then come back here.) 092.jpg a b c d yea, tried the whole confidance thing, kinda didnt work. i don't need you to hire me thanx, im a very hard worker but chemistry is like french to me and i really don't care if i learn it or not, it is quite irrelevant. i hope ur a better teacher than mine, cant even ask questions without making us feel stupid, but so many science teachers act like theyre too smart to teach. so why should i care, just want to get a grade.

Your poor grades are a direct reflection on your desire to get someone else to do your work. The ONLY way you can pass chemistry is to understand the material. The only way to understand the material is intensive study. This is a feeble attempt to circumvent the learning process. What will you do the next time something difficult crosses your path? Bluntly speaking, this shows lack of character, accountability, and responsibility. I would not hire you.