Chemistry concepts and calculations

1. An exergonic reaction is a reaction for which G

1. An exergonic reaction is a reaction for which G <0, and an endergonic reaction is a reaction for which G > 0. The following questions investigate the molecular basis for …

1. An experiment calls for you to use 100 mL of 0.25 M HNO3 solution. All you ha

1. An experiment calls for you to use 100 mL of 0.25 M HNO3 solution. All you have available is a bottle of 3.4 M HNO3. How many milliliters of the 3.4 M HNO3 solution do you need…

1. An experiment shows that a 112 mL gas sample has a mass of 0.173 g at a press

1. An experiment shows that a 112 mL gas sample has a mass of 0.173 g at a pressure of 739 mmHg and a temperature of 30 C. What is the molar mass of the gas? 2 Aluminum oxide can …

1. An explosive with a formula weight of 341.5 g/mole and a heat of formation of

1. An explosive with a formula weight of 341.5 g/mole and a heat of formation of -421.6 kJ/mole detonates and produces elemental nitrogen, hydrogen, CO(g), CO2(g), and H2O(g). If …

1. An ideal gas (which is is a hypothetical gas that conforms to the laws govern

1. An ideal gas (which is is a hypothetical gas that conforms to the laws governing gas behavior) confined to a container with a massless piston at the top. (Figure 2)  A massless…

1. An ideal gas at 7°C is in a spherical flexible container having a radius of 1

1. An ideal gas at 7°C  is in a spherical flexible container having a radius of 1.00 cm . The gas is heated at constant pressure to 88°C  . Determine the radius of the spherical c…

1. An ideal gas is expanded at constant temperature. What are the signs (+, -, o

1. An ideal gas is expanded at constant temperature. What are the signs (+, -, or 0) of DeltaH, DeltaS, and DeltaG for this system? A) ?H = +, ?S = -, ?G = + B) ?H = 0, ?S = +, ?G…

1. An ideal gas of N identical particles, each of mass m, is confined to a one-d

1. An ideal gas of N identical particles, each of mass m, is confined to a one-dimensional line of length L. The gas is in equilibrium at temperature T, which is large enough for …

1. An ideal gaseous reaction (which is a hypothetical gaseous reaction that conf

1. An ideal gaseous reaction (which is a hypothetical gaseous reaction that conforms to the laws governing gas behavior) occurs at a constant pressure of 45.0 atm and releases 63.…

1. An independent set of a graph G = (V, E) is a subset V 0 ? V of vertices such

1. An independent set of a graph G = (V, E) is a subset V 0 ? V of vertices such that each edge in E is incident on at most one vertex in V 0 . The independent set problem is to f…

1. An individual inhaled what was represented to be marijuana; however, the subs

1. An individual inhaled what was represented to be marijuana; however, the subsequent effects were much more exaggerated than expected. In addition to feeling euphoric, symptoms …

1. An insulated 10.0-L tank containing compressed Ar( g ) at 20.0 atm and 400. K

1. An insulated 10.0-L tank containing compressed Ar(g) at 20.0 atm and 400. K is connected to an un-insulated 20.0-L tank containing compressed Ne(g) at 10.0 atm and 300. K by a …

1. An iron supplement tablet labeled to contain 70 mg of iron was dissolved in e

1. An iron supplement tablet labeled to contain 70 mg of iron was dissolved in exactly 100.0 mL of H2O. What volume of this solution is needed to give a 0.020 mg/mL. Fe solution w…

1. An object weighing 12.22 g is added to 24.97mL of water in a graduated cylind

1. An object weighing 12.22 g is added to 24.97mL of water in a graduated cylinder. The water level rises to 27.66mL. Calcualte the density of the material? 2. A piece of alloy in…

1. An oil well has been dug to a depth of 333 m and oil is gushing out. At this

1. An oil well has been dug to a depth of 333 m and oil is gushing out. At this depth the estimated pressure on the top of the oil reservoir is 81.6 atmospheres. The density of oi…

1. An organic compound was found to contain 62.07% carbon,10.34% hydrogen, and 2

1. An organic compound was found to contain 62.07% carbon,10.34% hydrogen, and 27.59% oxygen. Determine its empirical formulaand suggest a few possible molecular formulas. Name ea…

1. An uknown sample weighed 2.129g. It contains CoCl 2 * H 2 O and NaCl and was

1. An uknown sample weighed 2.129g. It contains CoCl2 * H2O and NaCl and was heated to drive off all the water. The solid residue that remained weighed 1.712g. Calculate the perce…

1. An unapproved drug is referred to by FDA as a _________ drug and an applicati

1. An unapproved drug is referred to by FDA as a _________ drug and an application for investigations of unapproved drugs are called __________ (by the abbreviation). 2. The initi…

1. An unknown acid contains carbon, hydrogen and oxygen. When a 10.46 mg sample

1.     An unknown acid contains carbon, hydrogen and oxygen.  When a 10.46 mg sample was burned in oxygen it gave 26.4 mg of carbon dioxide and 4.63 mg of water.  The molecular ma…

1. An unknown compound is isolated. Mass spectrometry shows M and M+2 peaks at 7

1. An unknown compound is isolated. Mass spectrometry shows M and M+2 peaks at 75.5 and 77.5, at relative abundances of 3:1. IR showed a strong peak at 2261 cm-1 as well as at 931…

1. An unknown compound shows a weak molecular ion at m/z 87 in the mass spectrum

1. An unknown compound shows a weak molecular ion at m/z 87 in the mass spectrum, and the only large peak is at m/z 30. The IR spectrum appears below. The NMR spectrum shows only …

1. An unknown containing cations from Group 1 (Hg2^2+, Ag+, Pb^2+) was treated w

1. An unknown containing cations from Group 1 (Hg2^2+, Ag+, Pb^2+) was treated with HCL. A white precipitate formed which was completely soluble in hot water. What ion(s) must be …

1. An unknown containing cations from Group 1 (Hg2^2+, Ag+, Pb^2+) was treated w

1. An unknown containing cations from Group 1 (Hg2^2+, Ag+, Pb^2+) was treated with HCL. A white precipitate formed which was completely soluble in hot water. What ion(s) must be …

1. An unknown has a positive reaction in the 2,4-Dinitrophenylhydrazine test and

1. An unknown has a positive reaction in the 2,4-Dinitrophenylhydrazine test and a negative reaction to the chromic acid test. The unknown is a ketone. a.True b. False 2. An unkno…

1. An unknown has a positive reaction in the 2,4-Dinitrophenylhydrazine test and

1. An unknown has a positive reaction in the 2,4-Dinitrophenylhydrazine test and a negative reaction to the chromic acid test. The unknown is a ketone. a.True b. False 2. An unkno…

1. An unknown has the following physical data: Molecular formular of C3H8O IR: 3

1. An unknown has the following physical data: Molecular formular of C3H8O IR: 3400, 2950, 1460, 1385, 1365, 1100 cm^-1 Draw the structures consistent with the analysis. Which one…

1. An unknown metal is found to have a specific heat capactiy of 0.281. From thi

1. An unknown metal is found to have a specific heat capactiy of 0.281. From this, calculate its molar mass. 1. A student measures the initial temperature of an object as 26.17oC …

1. An unknown sample of ore with a mass of 11.3629 g is allowed to react with ex

1. An unknown sample of ore with a mass of 11.3629 g is allowed to react with excess dimethylglyoxime, HC4H7O2N2, in order to analyze for nickel, according to the following precip…

1. An unknown solid was added to a formic acid solution, which increased the pH

1. An unknown solid was added to a formic acid solution, which increased the pH of the solution. Is the unknown substance NaNO3 or NaCHO2? Explain how you arrived at your decision…

1. An unknown solution gave a strong yellow flame test. The solution gave no rea

1. An unknown solution gave a strong yellow flame test. The solution gave no reaction with ammonium carbonate, ammonium phosphate, or ammonium sulfate. The halide test produced a …

1. Analytical techniques that can be used for trace metal measurements include:

1. Analytical techniques that can be used for trace metal measurements include: (a) atomic absorption spectrometry (AAS), (b) atomic fluorescence spectrometry (AFS), (c) inductive…

1. Animals oxidize carbohydrate and can use fragments of extra carbohydrate such

1. Animals oxidize carbohydrate and can use fragments of extra carbohydrate such as acetyl CoA to form lipids. Animals can oxidize lipids and use the energy for metabolic processe…

1. Answer EITHER part (a) OR part (b). (a) A gas scrubber on an oilrig discharge

1. Answer EITHER part (a) OR part (b). (a) A gas scrubber on an oilrig discharged gas periodically such that an accumulation of hydrocarbon gas nearby had occurred. A contractor w…

1. Answer is option (A) CH3COH is polar molecule + Hydrogen bonding exists. CH3C

1. Answer is option (A) CH3COH is polar molecule + Hydrogen bonding exists. CH3Cl is polar molecule N2 having lone pairs on nitrogen atoms He is a inert gas 2. Answer is option (C…

1. Answer the following a) Determine the number of electrons transferred for 1.0

1. Answer the following a) Determine the number of electrons transferred for 1.0 g of Fe (s) reacted. Consider the following overall reaction for the formation of rust, iron(III) …

1. Answer the following questions based on the reaction coordinate. a) How many

1. Answer the following questions based on the reaction coordinate. a) How many intermediates are formed in the reaction? b) Which letters represent transition states? c) What is …

1. Answer the following questions concerning the mass spectra of the alkene prod

1. Answer the following questions concerning the mass spectra of the alkene products obtained from the dehydration of 4-methyl-2-pentanol. a. Three of the alkene products show lar…

1. Answer the following questions concerning the mass spectra of the alkene prod

1. Answer the following questions concerning the mass spectra of the alkene products obtained from the dehydration of 4-methyl-2-pentanol. a. Three of the alkene products show lar…

1. Answer the following questions regarding chemical kinetics: A. Given the rate

1. Answer the following questions regarding chemical kinetics: A. Given the rate law equation: Rate = k[A]1[B]2 Determine: a) the reaction order with respect to A, b) the reaction…

1. Answer the following questions regarding the acid- base reaction described be

1. Answer the following questions regarding the acid- base reaction described below: In a mixture containing 2.6 g of propanoic acid and 2.2 g of acetanilide (MW CH3CH2COOH= 74 g/…

1. Answer the following set of questions regarding the redox equationlisted belo

1.           Answer the following set of questions regarding the redox equationlisted below:            KMnO4   +  Na2SO3   +  H2O     MnO2  +  Na2SO4   +   KOH            The cha…

1. Answer the following: a. Give a description for the following terms: Annual L

1. Answer the following: a. Give a description for the following terms: Annual Loss Expectancy (ALE), Annual Rate of Occurrence (ARO), and Single Loss Expectancy (SLE). b. If the …

1. Answer the questions below according to the following unbalanced redox reacti

1. Answer the questions below according to the following unbalanced redox reaction In3+ + Li(s) --------> In (s) + Li+ a. Write the balanced half reaction for the species that …

1. Answer the questions below according to the following unbalanced redox reacti

1. Answer the questions below according to the following unbalanced redox reaction In3+ + Li(s) --------> In (s) + Li+ a. Write the balanced half reaction for the species that …

1. Anti-acid tablets contain CaCO3 as the active ingredient. Write the balanced

1. Anti-acid tablets contain CaCO3 as the active ingredient. Write the balanced equation for the reactivity of CaCO3 with HCl. 2. Calculate the molar solubility of CaCO3. Ksp for …

1. Anti-acid tablets contain CaCO3 as the active ingredient. Write the balanced

1. Anti-acid tablets contain CaCO3 as the active ingredient. Write the balanced equation for the reactivity of CaCO3 with HCl. 2. Calculate the molar solubility of CaCO3. Ksp for …

1. Approximately how many mL of 5% BaCl2. 2H2O solution would be required to pre

1. Approximately how many mL of 5% BaCl2. 2H2O solution would be required to precipitate all the sulfate if we assume that your sample are pur sodium sulfate? assume that the dens…

1. Aqueous manganese(II) sulfate reacts with aqueous potassiumhydroxide to produ

1.    Aqueous manganese(II) sulfate reacts with aqueous potassiumhydroxide to produce aqueous manganese(II) hydroxide and aqueouspotassium sulfate 2.    Aqueous manganese(II) hydr…

1. Archaeological studies of underwater sites have special considerations for id

1. Archaeological studies of underwater sites have special considerations for identifying artifacts. For objects that cannot be brought up to the surface for analysis, atomic emis…

1. Archaeological studies of underwater sites have special considerations for id

1. Archaeological studies of underwater sites have special considerations for identifying artifacts. For objects that cannot be brought up to the surface for analysis, atomic emis…