Chemistry concepts and calculations

1a)A sample of gas is compressed from 13.01 L to 4.27 L using a constant externa

1a)A sample of gas is compressed from 13.01 L to 4.27 L using a constant external pressure of 3.63 atm. At the same time, 1,453 J of heat flows into the surroundings. What is the …

1a)Determine the net charge of the following tetrapeptide at pH 4 that contains

1a)Determine the net charge of the following tetrapeptide at pH 4 that contains the amino acids represented by the single letters “KILT”, such that K is at the amino-terminal end …

1a)Ethene (C2H4) burns in oxygen to give CO2 and H2O: C2H4 + 3 O2 --> 2 CO2 + 2

1a)Ethene (C2H4) burns in oxygen to give CO2 and H2O: C2H4 + 3 O2 --> 2 CO2 + 2 H2O How many moles of oxygen are needed to react with 0.254 moles of ethene? ___ mols oxygen 1b)…

1a)Suppose a solution is prepared by dissolving 15.0 g NaOH in 0.150 L of 0.250

1a)Suppose a solution is prepared by dissolving 15.0 g NaOH in 0.150 L of 0.250 M nitric acid. What is the final concentration of OH- ions in the solution after the reaction has g…

1a)Suppose if CaO is added as an impurity to Li2O and CaCl2. In the first system

1a)Suppose if CaO is added as an impurity to Li2O and CaCl2. In the first system, Ca ion substitutes for Li ion and in the second, oxygen substitutes for Cl. What kind of defects …

1a)The enthalpy change for the reaction below at 25oC is -1,850 kJ (per mole of

1a)The enthalpy change for the reaction below at 25oC is -1,850 kJ (per mole of C9H20). What is the internal energy change for the reaction at 25oC? 9 CO(g) + 19 H2(g) --> C9H2…

1a)What is the density of Ar gas (molar mass, 39.95 g mol-1) at 21.2oC and 1.10E

1a)What is the density of Ar gas (molar mass, 39.95 g mol-1) at 21.2oC and 1.10E2 kPa? Give your answer in grams per litre (g L-1), accurate to three significant figures 1b)Carbon…

1a)What is w when a gas is compressed from 38.3 L to 28.8 L using a constant ext

1a)What is w when a gas is compressed from 38.3 L to 28.8 L using a constant external pressure of 745 mmHg? (Remember to include a "+" or "-" sign as appropriate.) Enter your answ…

1a)What is w when a gas is compressed from 38.3 L to 28.8 L using a constant ext

1a)What is w when a gas is compressed from 38.3 L to 28.8 L using a constant external pressure of 745 mmHg? (Remember to include a "+" or "-" sign as appropriate.) Enter your answ…

1a)What is w when a gas is compressed from 38.3 L to 28.8 L using a constant ext

1a)What is w when a gas is compressed from 38.3 L to 28.8 L using a constant external pressure of 745 mmHg? (Remember to include a "+" or "-" sign as appropriate.) Enter your answ…

1a)When magnesium carbonate, MgCO3, is treated with a dilute solution of nitric

1a)When magnesium carbonate, MgCO3, is treated with a dilute solution of nitric acid, HNO3, the products are magnesium nitrate, Mg(NO3)2, water and carbon dioxide gas. What is the…

1a. 1-butene is treated with HBr and peroxides. The product is ___ because a ___

1a. 1-butene is treated with HBr and peroxides. The product is ___ because a ____ radical intermediate forms. 1-bromobutane/1o 1-bromobutane/2o 2-bromobutane/1o 2-bromobutane/2o 1…

1a. 90 mL of sterile water is added in order to create a 125 mL bottle with a co

1a. 90 mL of sterile water is added in order to create a 125 mL bottle with a concentration of 250 mg per 5 mL. If 65 mL of water were mistakenly added instead of 90 mL when recon…

1a. A prevailing pressure of one standard atmosphere will support a column of me

1a.  A prevailing pressure of one standard atmosphere will support a column of mercury 760 mm in height. Liquid gallium has a density of 6.20 g/mL. The height of a column of liqui…

1a. A salt stock solution ([NaCl] = 2.54 M) has 23.76 mL removed. How many grams

1a. A salt stock solution ([NaCl] = 2.54 M) has 23.76 mL removed. How many grams of sodium chloride are in the solution removed? a. 3.53 g NaCl b. 0.0604 g NaCl 1b. 25.00 mL of a …

1a. A sample of argon gas at a pressure of 0.824 atm and a temperature of 26.2 °

1a. A sample of argon gas at a pressure of 0.824 atm and a temperature of 26.2 °C, occupies a volume of 10.4 liters. If the gas is allowed to expand at constant temperature to a v…

1a. A sample of methane gas at 292 K and 0.160 atm occupies a volume of 2.06 L.

1a. A sample of methane gas at 292 K and 0.160 atm occupies a volume of 2.06 L. If the pressure of the gas is increased, while at the same time it is heated to a higher temperatur…

1a. A student is given 400 ml of a 3 M solution of NaCl and told to make 1,000 m

1a. A student is given 400 ml of a 3 M solution of NaCl and told to make 1,000 ml of a .5M NaCl solution. How much H2O must be added to how ml of the original solution to arrive a…

1a. Alcohols are ____ leaving groups. To make an alcohol a ___ leaving group, ad

1a. Alcohols are ____ leaving groups. To make an alcohol a ___ leaving group, add ____. good/better/base poor/ better/ acid poor/ worse/base 1b. Which method will not produce etha…

1a. At the endpoint in the titration of sodium hydroxide with sulfuric acid a. t

1a. At the endpoint in the titration of sodium hydroxide with sulfuric acid a. the moles of H+ added to the solution are twice the moles of hydroxide added. b. the moles of H+ add…

1a. Botulinum toxin is a poison produced by the bacterium Clostridium botulinum.

1a. Botulinum toxin is a poison produced by the bacterium Clostridium botulinum. Botulinum toxin interferes with the function of the proteins facilitating exocytosis. 1b. How woul…

1a. Consider a mixture of water and air in a sealed container. Which of the foll

1a. Consider a mixture of water and air in a sealed container. Which of the following changes will increase the amount of nitrogen dissolved in the water? [Select all that apply.]…

1a. Determine the quantity of heat that flows from a 25.0g sheet of aluminum foi

1a. Determine the quantity of heat that flows from a 25.0g sheet of aluminum foil as it cools from an oven temperature of 450 degrees Fahrenheit (232 C) to a room temperature of 7…

1a. Ethylbenzene reacts with KMnO4 to form ____. This is a ___ reaction. phenyla

1a. Ethylbenzene reacts with KMnO4 to form ____. This is a ___ reaction. phenylacetic acid benzoic acid no reaction substitution elimination oxidation 1b. Ethylbenzene reacts with…

1a. How many 1H NMR peaks (ignore splitting) do you expect for 3-carbethoxycouma

1a. How many 1H NMR peaks (ignore splitting) do you expect for 3-carbethoxycoumarin? 1b. Do you think 3-carbethoxycoumarin will absorb at longer orshorter wavelengths than benzene…

1a. How many grams of a 2.5% hydrocortisone cream should be mixed with 360 grams

1a. How many grams of a 2.5% hydrocortisone cream should be mixed with 360 grams of a 0.25% hydrocortisone cream to make a 1% cream? 1b. The package insert of a 20 mL vial of an i…

1a. How many moles of nitrogen gas are present in a 3.6 L cylinder stored at 25

1a. How many moles of nitrogen gas are present in a 3.6 L cylinder stored at 25 degree C and 1.0 atm? b. In a typical automobile, the fuel/air mixture in the cyliner is compressed…

1a. I spread ___ on my dinner rolls on Thanksgiving because___. butter/it has mo

1a. I spread ___ on my dinner rolls on Thanksgiving because___. butter/it has more saturated fat than margarine margarine/it has more trans fat than butter butter/it tastes better…

1a. If 24.028 g of benzene, C6H6, at 9.025 °C absorbs 2.71 kJ of energy in the f

1a. If 24.028 g of benzene, C6H6, at 9.025 °C absorbs 2.71 kJ of energy in the form of heat, what is the final temperature of the benzene? The specific heat capacity of benzene is…

1a. If a charge Q is spread uniformly throughout the volume of an insulating sph

1a. If a charge Q is spread uniformly throughout the volume of an insulating sphere (that is, charge cannot move around inside it) of radius r, what fraction of the charge lies wi…

1a. In an aldol or Claisen condensation reaction, an enolate ion or ester enolat

1a. In an aldol or Claisen condensation reaction, an enolate ion or ester enolate ion behaves like a _____ and reacts at a _____ . electrophile nucleophile acidic H alpha carbon c…

1a. In mass spectrometry, the molecular ion peak is the ___ and tells you the __

1a. In mass spectrometry, the molecular ion peak is the ___ and tells you the ____. tallest peak/bond types (M)+• peak/molecular weight (M+1)+• peak/base peak 1b. The HDI of C3H5C…

1a. Indicate which solution in each pair has the lower pH. Your response should

1a. Indicate which solution in each pair has the lower pH. Your response should be a four letter "word". The first letter should be either a or b, the second letter either c or d,…

1a. Like H20, SO2 possesses Civ symmetry. Use the character table below to deter

1a. Like H20, SO2 possesses Civ symmetry. Use the character table below to determine the symmetry labels for the sulfurs, pu py, and p,orbitals, and the ..ligand" and -LG0s (shown…

1a. Natural selection will ultimately make a species a. more intelligent b. phys

1a. Natural selection will ultimately make a species a. more intelligent b. physically bigger c. better adapted to its environment d. more aggressive 2b. a titmouse and a chickade…

1a. Of the following anions used in this experment (CI^- , CO3^(2-) , I^- , OH^-

1a. Of the following anions used in this experment (CI^- , CO3^(2-) , I^- , OH^- , NO3^- and SO4^(2-) which would form a precipitate with Ba^(2+)? Write balanced net ionic equatio…

1a. Suppose that a plastic rod that has been rubbed with fur is used to charge b

1a. Suppose that a plastic rod that has been rubbed with fur is used to charge both a metal-coated ball and a metal can. Mark the sign of the charges in the metal can and on the b…

1a. The conjugate acid of amines have ____ pKa’s than alcohols and are ___ bases

1a. The conjugate acid of amines have ____ pKa’s than alcohols and are ___ bases than alcohols. higher lower stronger weaker 1b. Which method will not make an amine?(Maybe more th…

1a. The freezing point of ethanol , CH 3 CH 2 OH , is -117.300 ° C at 1 atmosphe

1a. The freezing point of ethanol, CH3CH2OH, is -117.300 °C at 1 atmosphere.  Kf(ethanol) = 1.99 °C/m In a laboratory experiment, students synthesized a new compound and found tha…

1a. To make a 1,2-difunctionalized compound: (May be more than one answer ) alke

1a. To make a 1,2-difunctionalized compound:(May be more than one answer) alkene + Br2 aldol Claisen Michael addition acetone + CH3OH/H+ 1b. To make a 1,3-difunctionalized compoun…

1a. What happens to the pressure of an ideal gas if you double its temperature i

1a. What happens to the pressure of an ideal gas if you double its temperature in a closed volume? And what happens to the pressure of an ideal gas if you double its volume at a f…

1a. What is vapor pressure and why does it change with temperature? 1b. What is

1a. What is vapor pressure and why does it change with temperature? 1b. What is enthalpy of vaporization? 1.cThe assumption was made that the vapor pressure of water is negligible…

1a. What is vapor pressure and why does it change with temperature? 1b. What is

1a. What is vapor pressure and why does it change with temperature? 1b. What is enthalpy of vaporization? 1.cThe assumption was made that the vapor pressure of water is negligible…

1a. When a solid dissolves in water, heat may be evolved or absorbed. The heat o

1a. When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution(dissolving) can be determined using a coffee cup calorimeter. 1b.   1c. In the labora…

1a. When an acid reacts with an amine, the ____ is the nucleophile and the produ

1a. When an acid reacts with an amine, the ____ is the nucleophile and the product is a ____. acid amine ester amide nitrile 1b. In an acid, ester, and nitrile, the carbonyl carbo…

1a. Which method will not make a ketone? 1-propanol + PCC 2-methylpropene + O3 p

1a. Which method will not make a ketone? 1-propanol + PCC 2-methylpropene + O3 propyne + H2SO4/HgSO4 1b. The carbonyl carbon in acetone is a ___ than ____. It reacts with a _____ …

1a. Which of the following is true concerning pressure of a real gas compared wi

1a. Which of the following is true concerning pressure of a real gas compared with the pressure predicted by the ideal gas equation a) Real pressure is lower than ideal pressure b…

1a. Which of the following is true concerning pressure of a real gas compared wi

1a. Which of the following is true concerning pressure of a real gas compared with the pressure predicted by the ideal gas equation a) Real pressure is lower than ideal pressure b…

1a. determine the pH of a citrate buffer that is 0.14 M citric acid (H3C6H5O7) a

1a. determine the pH of a citrate buffer that is 0.14 M citric acid (H3C6H5O7) and 0.18 M sodium citrate (NaH2C6H5O7). (What if it were 0.14 sodium citrate and 0.18 M disodium cit…

1a.) For Ag3PO4, the measured \"s\" cited at 25 degrees C is 6.7 x10^-3 g/L and

1a.) For Ag3PO4, the measured "s" cited at 25 degrees C is 6.7 x10^-3 g/L and one chemical literature table gives Ksp (Ag3PO4) =2.8 x 10^-18. If s is correct (likely since various…