Chemistry concepts and calculations

1) In a Reverse Phase HPLC procedure, will the most polar components in the samp

1) In a Reverse Phase HPLC procedure, will the most polar components in the sample elute near the beginning or late part of the chromatogram? How does this compare to HILIC? 2a) R…

1) In a blast furance, a mixture of iron (iii) oxide ( Fe2O3 ) and carbon is hea

1) In a blast furance, a mixture of iron (iii) oxide ( Fe2O3 ) and carbon is heated to form iron metal and carbon dioxide. A) write and balance a chemical equation for this reacti…

1) In a blast furance, a mixture of iron (iii) oxide ( Fe2O3 ) and carbon is hea

1) In a blast furance, a mixture of iron (iii) oxide ( Fe2O3 ) and carbon is heated to form iron metal and carbon dioxide. A) write and balance a chemical equation for this reacti…

1) In a certain city, electricity costs $0.20 per kW·h. What is the annual cost

1) In a certain city, electricity costs $0.20 per kW·h. What is the annual cost for electricity to power a lamp-post for 5.00 hours per day with (a) a 100.-watt incandescent light…

1) In a coffee cup calorimeter, 50.0ml of 1.00M NaOH and 50.0ml of 1.00M HCl are

1) In a coffee cup calorimeter, 50.0ml of 1.00M NaOH and 50.0ml of 1.00M HCl are mixed. Both solutions were originally at 24 degrees celsius. After the reaction, the final tempera…

1) In a decision structure, the _____ clause executes when the condition is fals

1) In a decision structure, the _____ clause executes when the condition is false. a) If b) While c) Else d) Case 2) The expression amount < 10 is a(n) _____ expression. a) ari…

1) In a laboratory experiment, a 10.0-mL sample of NaCl solution is poured into

1) In a laboratory experiment, a 10.0-mL sample of NaCl solution is poured into an evaporating dish with a mass of 24.10 g. The combined mass of the evaporating dish and NaCl solu…

1) In a laboratory experiment, students synthesized a new compound and found tha

1) In a laboratory experiment, students synthesized a new compound and found that when 10.07 grams of the compound were dissolved to make157.2 mL of a ethanol solution, the osmoti…

1) In a photoelectric effect experiment, a studentshines a light of greater than

1) In a photoelectric effect experiment, a studentshines a light of greater than the threshold frequency upon thesurface of the metal. She observes that after a long time,the numb…

1) In a reaction, gaseous reactants form a liquid product. The heat absorbed by

1) In a reaction, gaseous reactants form a liquid product. The heat absorbed by the surrounding is 26.0 kcal, and work done on the system is 15.0 Btu. Calculate Change in energy (…

1) In a titration of a 100.0mL 1.00M HCl strong acid solution with 1.00M NaOH, w

1) In a titration of a 100.0mL 1.00M HCl strong acid solution with 1.00M NaOH, what is the pH of the solution after the addition of 33.1 mL of NaOH? (3 significant figures) **Reme…

1) In amino acid catabolism, the first reaction for many amino acids is a(n): a)

1) In amino acid catabolism, the first reaction for many amino acids is a(n): a) decarboxylation requiring thiamine pyrophosphate (TPP). b) hydroxylation requiring NADPH and O2. c…

1) In an -labeled fatty acid, to which carbon atom in the chain is the label (1p

1) In an -labeled fatty acid, to which carbon atom in the chain is the label (1pts) attached? C-2 C-4 O c-1 the terminal carbon 2) What is the name of the molecule shown below? (1…

1) In an experiment, 7.36 g of zine was heated with 6.45 g of sulfur. Assume tha

1) In an experiment, 7.36 g of zine was heated with 6.45 g of sulfur. Assume that t according to the equation 8Zn + Ss-NZns. what amount of zanc sulfide was produced? How grams of…

1) In concentrated sulfuric acid, ethanol (CH 3 CH 2 OH) forms diethyl ether (CH

1) In concentrated sulfuric acid, ethanol (CH3CH2OH) forms diethyl ether (CH3CH2OCH2CH3) and water according to the reaction 2 CH3CH2OH ? CH3CH2OCH2CH3 + H2O In a side reaction, s…

1) In doing the Calorimetry experiment, a student did not follow the directions

1) In doing the Calorimetry experiment, a student did not follow the directions exactly. How would the experiment be affected if no plot of temperature was carried out. Instead th…

1) In order to destroy ozone in the upper stratosphere, why is the mechanism inv

1) In order to destroy ozone in the upper stratosphere, why is the mechanism involving dichloroperoxide of negligible importance compared to the one that proceeds by ClO + O? 2) R…

1) In order to form acetyl salicylic acid, acetic anhydride and salicylic acid i

1) In order to form acetyl salicylic acid, acetic anhydride and salicylic acid is mixed with phospherous acid as a catalyst and heated for 5 minutes. After 5 minutes water is adde…

1) In order to understand how this equation is derived and why it holds true, th

1) In order to understand how this equation is derived and why it holds true, the product of each side of the equation should be examined. What value and unit do you get when you …

1) In photography, unexposed silver bromide is removed from film by soaking the

1) In photography, unexposed silver bromide is removed from film by soaking the film in a solution of sodium thiosulfate, Na2S2O3. Silver ion forms a soluble complex with thiosulf…

1) In photosynthesis, plants from glucose (C6H12O6) and oxygen from carbon dioxi

1) In photosynthesis, plants from glucose (C6H12O6) and oxygen from carbon dioxide and water Part B Calculate delta H rxn at 15 degree C Part C Calculate delta S rxn at 15 degree …

1) In solution formation solvation always release more energy than that required

1) In solution formation solvation always release more energy than that required to separate particles, so the overall process is always exothermic. true or false 2) For most ioni…

1) In solution formation solvation always release more energy than that required

1) In solution formation solvation always release more energy than that required to separate particles, so the overall process is always exothermic. true or false 2) For most ioni…

1) In solutions 1-5, what are the concentrations of the lron() itrate and Potass

1) In solutions 1-5, what are the concentrations of the lron() itrate and Potassium Thiocyanate after mixing of the 2 solutions occurs and before any reaction takes place? Solutio…

1) In the above redox reaction, use oxidation numbers to identify the element ox

1) In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent. 2) In the above redox reac…

1) In the above redox reaction, use oxidation numbers to identify the element ox

1) In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent. 2) In the above redox reac…

1) In the diagram, the change in energy for the reaction is represented by the l

1) In the diagram, the change in energy for the reaction is represented by the letter ____. 1) Options: D F A B E C 2) In the diagram, the activation energy of the reaction is rep…

1) In the electrochemical voltaic cell using the reaction, Zn(s) + Cu 2+ (aq) Zn

1) In the electrochemical voltaic cell using the reaction, Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s), match the correct 1/2 reaction that occurs at the anode and cathode. 1/2 reaction occ…

1) In the laboratory you dissolve 19.8 g of manganese(II) iodide in a volumetric

1) In the laboratory you dissolve 19.8 g of manganese(II) iodide in a volumetric flask and add water to a total volume of 125 mL. What is the molarity of the solution?____ M. What…

1) In the laboratory you dissolve 19.8 g of manganese(II) iodide in a volumetric

1) In the laboratory you dissolve 19.8 g of manganese(II) iodide in a volumetric flask and add water to a total volume of 125 mL. What is the molarity of the solution?____ M. What…

1) In the laboratory, a student dilutes 18.3 mL of a 9.98 M perchloric acid solu

1) In the laboratory, a student dilutes 18.3 mL of a 9.98 M perchloric acid solution to a total volume of 300.0 mL. What is the concentration of the diluted solution ? ------> …

1) In the photoelectric effect, a photon with an energy of 5.3 X 10^-19 J strike

1) In the photoelectric effect, a photon with an energy of 5.3 X 10^-19 J strikes an electron in a metal. Of this energy, 3.6 X 10^-19 J is the minimum energy required for the ele…

1) In the reaction A-->2B, the rate law was determined to be rate=k[A] 2 (k=0.1

1) In the reaction A-->2B, the rate law was determined to be rate=k[A]2 (k=0.1 M-1min-1). When the initial [A]=0.5M, what is the concentration of A after one hour?    2) The ha…

1) In the reaction Fe2O3 + 3CO ? 2Fe + 3CO2, which atom(s) has a more positive o

1) In the reaction Fe2O3 + 3CO ? 2Fe + 3CO2, which atom(s) has a more positive oxidation state on the product side than the reactant side? A) carbon and iron B) iron C) carbon D) …

1) In the table below, which of the following is a correct pairing of an enzyme,

1) In the table below, which of the following is a correct pairing of an enzyme, covalent modification and level of activity in the FED state (ratio of insulin to glucagon is >…

1) In the tests with sodium iodide in acetone and silver nitrate in ethanol, why

1) In the tests with sodium iodide in acetone and silver nitrate in ethanol, why should 2-bromobutane react faster than 2-chlorobutane? 2) Why is benzyl chloride reactive in both …

1) In the titration of a solution of weak monoprotic acid with a 0.1150 M soluti

1) In the titration of a solution of weak monoprotic acid with a 0.1150 M solution of NaOH, the pH half way to the equivalence point was 4.46 . In the titration of a second soluti…

1) In this lab, you prepared 3.5% NaCl solution in water. In a typical intraveno

1) In this lab, you prepared 3.5% NaCl solution in water. In a typical intravenous (IV) bag, the concentration is 0.9% NaCl (w/v) or 0.9% saline. This is to maintain the same osmo…

1) In this virtual lab, you will use coffee cup calorimetry to determine the spe

1) In this virtual lab, you will use coffee cup calorimetry to determine the specific heat, c, of a metal. Imagine that, in lab, you record the mass of a piece of metal, mmetal, a…

1) In this virtual lab, you will use coffee cup calorimetry to determine the spe

1) In this virtual lab, you will use coffee cup calorimetry to determine the specific heat, c, of a metal. Imagine that, in lab, you record the mass of a piece of metal, Mmetal, a…

1) In which of the following pairs of numbers does each member of the pair conta

1) In which of the following pairs of numbers does each member of the pair contain the same number of B) 0.05700 and 0.0570 C) 39 and 3090 2) A rubber band is found to weigh 0.097…

1) Index of hydrogen deficiency (IHD) aka Degree of Unsaturated is a calculation

1) Index of hydrogen deficiency (IHD) aka Degree of Unsaturated is a calculation formula to determine the total number of double bonds, triple bonds and rings in a given chemical …

1) Indicate how each of the following errors would affect(increase, decrease, or

1) Indicate how each of the following errors would affect(increase, decrease, or no change) your calculated value for the molar volume of O2 at STP (assuming that you complete the…

1) Indicate the molecular formula for each of the following compounds. Enter you

1) Indicate the molecular formula for each of the following compounds. Enter your answer in form of CxHyOw. Carbon atom(s): One hydrogen bonded to the numbered atom: Two hydrogens…

1) Indicate the molecular formula for each of the following compounds. Enter you

1) Indicate the molecular formula for each of the following compounds. Enter your answer in form of CxHyOw. Carbon atom(s): One hydrogen bonded to the numbered atom: Two hydrogens…

1) Indicate the molecular formula for each of the following compounds. Enter you

1) Indicate the molecular formula for each of the following compounds. Enter your answer in form of CxHyOw. 2) Carbon atom(s): One hydrogen bonded to the numbered atom: Two hydrog…

1) Inspect carefully the molecular geometry around the electrophilic carbon in t

1) Inspect carefully the molecular geometry around the electrophilic carbon in the transition state of an SN2 reaction. What is the molecular geometry at this central atom? tetrah…

1) Into a 0.25 M solution of NaCl(aq), excess Al(NO3)3(aq) was added to form AlC

1) Into a 0.25 M solution of NaCl(aq), excess Al(NO3)3(aq) was added to form AlCl3(s). 3NaCl(aq) + Al(NO3)3(aq) ? AlCl3(s) + 3NaNO3(aq) If you knew the volume of the solution cont…

1) Is ring A or B more reactive towards EAS reaction with Br2, FeBr3? please sho

1) Is ring A or B more reactive towards EAS reaction with Br2, FeBr3? please show electron movement. draw the major product formed when 1 eq. of Br2 and FeBr3 is added to each mol…

1) Is ring A or B more reactive towards EAS reaction with Br2, FeBr3? please sho

1) Is ring A or B more reactive towards EAS reaction with Br2, FeBr3? please show electron movement. draw the major product formed when 1 eq. of Br2 and FeBr3 is added to each mol…