Chemistry concepts and calculations

1. Although the overall objective of this experiment is to determine the molar m

1. Although the overall objective of this experiment is to determine the molar mass of an unknown acid, the first acid you will titrate in this experiment will be a known acid, ox…

1. Aluminium combines with Hydrochloric acid to form Aluminium chloride and hydr

1. Aluminium combines with Hydrochloric acid to form Aluminium chloride and hydrogen. write a balanced equation and use 10.56g Aluminium to calculate the volume of hydrogen at STP…

1. Aluminum Oxide ---> Aluminum + Oxygen 2. Potassium + Water ---> Potassium Hyd

1. Aluminum Oxide ---> Aluminum + Oxygen 2. Potassium + Water ---> Potassium Hydroxide +Hydrogen 3. Nickel (III) Clorate ---> Nickel (III) Chloride +Oxygen 4.  Calcium Ph…

1. Aluminum can be determined gravimetrically by reaction with a solution of 8-h

1. Aluminum can be determined gravimetrically by reaction with a solution of 8-hydroxyquinoline (C9H7NO). The net ionic equation is: Al3++ 3C9H7NO ? Al(C9H6NO)3 + 3H+ A mass of 18…

1. Aluminum reacts with oxygen to produce aluminum oxide. 4 Al(s) 3020g) 2 Alzo,

1. Aluminum reacts with oxygen to produce aluminum oxide. 4 Al(s) 3020g) 2 Alzo, (s) If 12.0 moles of Al react with excess O., how many moles of Al,O, can be formed? (5 points) 2.…

1. Ammonia has the formula NH3, and methane has the formula CH4. According to Da

1. Ammonia has the formula NH3, and methane has the formula CH4. According to Dalton, which atom has more hooks on it, N or C, and how many more hooks does it have? 2. Name the th…

1. Ammonium carbamate, NH CONH,. reversibly decomposes into CO2 and NH3 as shown

1. Ammonium carbamate, NH CONH,. reversibly decomposes into CO2 and NH3 as shown by the balanced equation below: NHCO2NH2(s) = 2NH3(g) + CO2(g) K, = ? A student places 0.50 g of s…

1. Amylose is a \"polysaccharide\" that plants use to store energy. It is made o

1. Amylose is a "polysaccharide" that plants use to store energy. It is made of repeating subunits of C6H10O5. a. A particular amylose molecule has 2113 of these subunits, what is…

1. An 8.7-g ice cube is placed into 255g of water. Calculate the temperature cha

1. An 8.7-g ice cube is placed into 255g of water. Calculate the temperature change in the water upon the complete melting of the ice. Assume that all of the energy required to me…

1. An Acid of pH 2.75 is how many times are strong as one of pH 3.75? 2. Diffusi

1. An Acid of pH 2.75 is how many times are strong as one of pH 3.75? 2. Diffusion is the flow of _____. solute, solvent, or solid particles 3. Osmosis is the flow of _____. solut…

1. An HTTP clients opens a TCP connection using an ISN 0f 14,535 and port number

1. An HTTP clients opens a TCP connection using an ISN 0f 14,535 and port number of 59,100. The server opens the connection with an ISN of 21,732. assume the client sends a reques…

1. An alpha particle (the nucleus of a helium atom formed by 2 protons and 2 neu

1. An alpha particle (the nucleus of a helium atom formed by 2 protons and 2 neutrons with charge q = +2(1.6 x 10-19 C ) is moving perpendicular to a magnetic field of 0.710 tesla…

1. An alum is a double salt consisting of a monovalent cation, a trivalent catio

1. An alum is a double salt consisting of a monovalent cation, a trivalent cation, and two sulfate ions with 12 waters of hydration (waters of crystallization) as part of the crys…

1. An analytical procedure has a 95% confidence interval of ±0.06%. If a 90% con

1. An analytical procedure has a 95% confidence interval of ±0.06%. If a 90% confidence limit of ±0.06% is required by a regulatory agency, could this procedure still be used? 2. …

1. An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solu

1. An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Assume a density of 1.05 g/mL for the solution. a. Calculate the molarity of…

1. An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solu

1. An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Assume a density of 1.05 g/mL for the solution. a. Calculate the molarity of…

1. An aqueous solution containing 35.0% by mass of an unknown covalent compund i

1. An aqueous solution containing 35.0% by mass of an unknown covalent compund in water was found to have a freezing point of -3.5 deg C. Calculate the molar mass of the unknown c…

1. An aqueous solution contains 0.150 M HCl at 25.0 °C. The pH of the solution i

1. An aqueous solution contains 0.150 M HCl at 25.0 °C. The pH of the solution is ________. 2. Which solution has the higher pH, a 0.001 M solution of  NaOH or a 0.001 M solution …

1. An aqueous solution contains 0.26 M ammonium perchlorate . One liter of this

1. An aqueous solution contains 0.26 M ammonium perchlorate. One liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains consta…

1. An aqueous solution contains 0.28 M hypochlorous acid . One Liter of this sol

1. An aqueous solution contains 0.28 M hypochlorous acid. One Liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant …

1. An aqueous solution contains 0.34 M sodium cyanide . One liter of this soluti

1. An aqueous solution contains 0.34 M sodium cyanide. One liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as …

1. An aqueous solution contains 0.450 M hypochlorous acid . Calculate the pH of

1. An aqueous solution contains 0.450 M hypochlorous acid. Calculate the pH of the solution after the addition of 5.58×10-2 moles of potassium hydroxide to 225 mL of this solution…

1. An aqueous solution of 0.055 M KCN is made. At equilibrium this solution will

1. An aqueous solution of 0.055 M KCN is made. At equilibrium this solution will be A) Acidic B) Basic C) Neutral 2. Suppose you need to calculate the pH of an aqueous KCN solutio…

1. An aqueous solution of aluminum nitrite is prepared by dissolving 6.93 g of a

1. An aqueous solution of aluminum nitrite is prepared by dissolving 6.93 g of aluminum nitrite in 9.60×102 g of water. The density of the solution is 1.21 g mL-1. a) Determine th…

1. An aqueous solution of barium hydroxide is standardized by titration with a 0

1. An aqueous solution of barium hydroxide is standardized by titration with a 0.197 M solution of hydrobromic acid. If 10.4 mL of base are required to neutralize 22.7 mL of the a…

1. An aqueous solution of calcium chloride, CaCl2, is 3.464 M and has a density

1. An aqueous solution of calcium chloride, CaCl2, is 3.464 M and has a density of 1.2816 g cm-3. Assuming you have 1 liter of this solution answer the following questions. a) Use…

1. An aqueous solution of nitric acid is standardized by titration with a 0.199

1. An aqueous solution of nitric acid is standardized by titration with a 0.199 M solution of sodium hydroxide. If 15.5 mL of base are required to neutralize 24.6 mL of the acid, …

1. An array is a list of data items that . a. all have the same type b. all have

1. An array is a list of data items that . a. all have the same type b. all have different names c. all are integers d. all are null 2. When you declare an array, . a. you always …

1. An article (J. Agric. Food Chem. 1998, 46, 2671-2677) measured the binding co

1. An article (J. Agric. Food Chem. 1998, 46, 2671-2677) measured the binding constants for ANS binding to BSA and ovalbumin (OVA). In each case the reaction is ANS + protein prot…

1. An aspirin tablet was ground to a fine powder and dissolved in 10 ml of sodiu

1. An aspirin tablet was ground to a fine powder and dissolved in 10 ml of sodium hydroxide. This solution was quantitatively transferred to a 250 ml volumetric flask and diluted …

1. An atom contains 28 protons, 31 neutrons, and 26 electrons. What is the atomi

1. An atom contains 28 protons, 31 neutrons, and 26 electrons. What is the atomic number of this atom? (Express your answer as an integer.) 2. An Mg-24 atom weighs 23.985 amu. How…

1. An atom is made up of protons electrons and neutrons. Describe these particle

1. An atom is made up of protons electrons and neutrons. Describe these particles by stating their masses and charges. The masses should be stated in both grams and in amu units. …

1. An atom of 179 Ta has a mass of 178.945930 amu. Calculate the binding energy

1. An atom of 179Ta has a mass of 178.945930 amu. Calculate the binding energy per MOLE in kJ. Use the values: mass of 1H atom = 1.007825 amu mass of a neutron = 1.008665 amu c = …

1. An atom, X, has a ground state binding energy(energy necessary to eject elect

1. An atom, X, has a ground state binding energy(energy necessary to eject electron from the ground state) of 2.179e-18 J. The line(emission) spectrum for atom X is shown with n=2…

1. An electrochemical cell is based on the following two half-reactions: Ox: Pb(

1. An electrochemical cell is based on the following two half-reactions: Ox: Pb(s)Pb2+(aq, 0.18 M )+2e Red: MnO4(aq, 1.50 M )+4H+(aq, 1.8 M )+3e MnO2(s)+2H2O(l) Compute the cell p…

1. An electrochemical reaction involves the transfer of two electrons and has an

1. An electrochemical reaction involves the transfer of two electrons and has an equilibrium constant at 298 K of 1.68 × 104. What is E° for this reaction? SO42- + 4Cr2+ + 8H+ H2S…

1. An electron in an excited state of hydrogen undergoes a transition to the n =

1. An electron in an excited state of hydrogen undergoes a transition to the n = 1 level. In the process, a photon of energy 1.94×10-18 J is emitted. What was the value of the pri…

1. An electron is accelerated by a 5.7 kV potential difference. The charge on an

1. An electron is accelerated by a 5.7 kV potential difference. The charge on an electron is 1.60218 × 1019 C and its mass is 9.10939 × 1031 kg. How strong a magnetic field must b…

1. An entrepreneurial group of UCLA students starts a bubble gum company. The fi

1.      An entrepreneurial group of UCLA students starts a bubble gum company. The first variety of gum they decide to sell is banana and the flavor used in the gum is made accord…

1. An enzyme with a Km = 2 x 10-4 M for its substrate and a Vmax of 5.5 x 10-5 m

1. An enzyme with a Km = 2 x 10-4 M for its substrate and a Vmax of 5.5 x 10-5 moles per liter-min was assayed for its catalytic rate with its substrate present at 2 x 10-4 M. Cal…

1. An enzyme with a Km = 2 x 10-4 M for its substrate and a Vmax of 5.5 x 10-5 m

1. An enzyme with a Km = 2 x 10-4 M for its substrate and a Vmax of 5.5 x 10-5 moles per liter-min was assayed for its catalytic rate with its substrate present at 2 x 10-4 M. Cal…

1. An enzyme with a Km = 2 x 10-4 M for its substrate and a Vmax of 5.5 x 10-5 m

1. An enzyme with a Km = 2 x 10-4 M for its substrate and a Vmax of 5.5 x 10-5 moles per liter-min was assayed for its catalytic rate with its substrate present at 2 x 10-4 M. Cal…

1. An enzyme-catalyzed reaction was carried out in a 0.7 M \"carbonate\" buffer,

1. An enzyme-catalyzed reaction was carried out in a 0.7 M "carbonate" buffer, set at pH 7.7. As a result of the reaction, 0.02 M of OH was produced. pK, of "carbonate/bicarbonate…

1. An enzyme-catalyzed reaction was carried out in a 0.7 M \"carbonate\" buffer,

1. An enzyme-catalyzed reaction was carried out in a 0.7 M "carbonate" buffer, set at pH 7.7. As a result of the reaction, 0.02 M of OH was produced. pK, of "carbonate/bicarbonate…

1. An evaporation-crystallization process is used to obtain solid potassium sulp

1. An evaporation-crystallization process is used to obtain solid potassium sulphate from an aqueous solution of this salt. Fresh feed to the process 18.6 wt% K2SO4. The wet filte…

1. An example of a chemical property of formaldehyde (CH2O) is __________ a. it

1. An example of a chemical property of formaldehyde (CH2O) is __________ a. it is flammable. d. it dissolves in water. b. it has a density of 1.09 g/mL. e. it is a gas at room te…

1. An excess of sodium sulfate, Na SO, was added to a 1.000-L sample st pollu (N

1. An excess of sodium sulfate, Na SO, was added to a 1.000-L sample st pollu (Na,So.faq)JPb(NO(a) 2NaNOae).Pbso4s) PN nRT mass of lead (1) sulfate, PbSO,(MM-303.26 g/moD, that pr…

1. An excited electron on a hydrogen atom releases a photon as it falls from ene

1. An excited electron on a hydrogen atom releases a photon as it falls from energy level 6 to level 3. What is the wavelength of the photon released? a. 2.74 x1016 s-1 b. 2.18 x1…

1. An excited electron on a hydrogen atom releases a photon as it falls from ene

1. An excited electron on a hydrogen atom releases a photon as it falls from energy level 6 to level 3. What is the wavelength of the photon released? a. 2.74 x1016 s-1 b. 2.18 x1…

1. An excited electron on a hydrogen atom releases a photon as it falls from ene

1. An excited electron on a hydrogen atom releases a photon as it falls from energy level 6 to level 3. What is the wavelength of the photon released? a. 2.74 x1016 s-1 b. 2.18 x1…