Chemistry concepts and calculations

1. You are designing an underwater robot to search for sunken treasure in the oc

1. You are designing an underwater robot to search for sunken treasure in the ocean. You are considering the following alloys to use for the rivets and plates. For each alloy pair…

1. You are given a sample of green nickel sulfate hydrate for analysis. You weig

1. You are given a sample of green nickel sulfate hydrate for analysis. You weigh the sample in a dry covered crucible and obtain a mass of 22. 068 g for the crucible, cover and s…

1. You are given a sample of green nickel sulfate hydrate for analysis. You weig

1. You are given a sample of green nickel sulfate hydrate for analysis. You weigh the sample in a dry covered crucible and obtain a mass of 22. 068 g for the crucible, cover and s…

1. You are given an impure sample of a phenol and asked to purify it. You ask fo

1. You are given an impure sample of a phenol and asked to purify it. You ask for information about the suspected impurities, but it seems no one really knows. So you ask for an I…

1. You are given an impure sample of a phenol and asked to purify it. You ask fo

1. You are given an impure sample of a phenol and asked to purify it. You ask for information about the suspected impurities, but it seems no one really knows. So you ask for an I…

1. You are given an impure sample of a phenol and asked to purify it. You ask fo

1. You are given an impure sample of a phenol and asked to purify it. You ask for information about the suspected impurities, but it seems no one really knows. So you ask for an I…

1. You are given an impure sample of a phenol and asked to purify it. You ask fo

1. You are given an impure sample of a phenol and asked to purify it. You ask for information about the suspected impurities, but it seems no one really knows. So you ask for an I…

1. You are given an unknown solution that may contain Pb2+ or Ba2+, a mixture of

1. You are given an unknown solution that may contain Pb2+ or Ba2+, a mixture of both or neither ion. A reasonable method for separating these ions is shown below. Pb Ba NaCl Dilu…

1. You are given the following information of available streams that needs to be

1. You are given the following information of available streams that needs to be either cooled or heated as described below Stream Inlet Temp. Outlet Temp. Flow Rate Heat capacity…

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane (C5H12, a liquid), calcium chloride (CaCl2) solution, and aqueous ammonium hydroxide (NH4OH, ammoni…

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane (C5H12, a liquid), calcium chloride (CaCl2) solution, and aqueous ammonium hydroxide (NH4OH, ammoni…

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane (C5H12, a liquid), calcium chloride (CaCl2) solution, and aqueous ammonium hydroxide (NH4OH, ammoni…

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane (C5H12, a liquid), calcium chloride (CaCl2) solution, and aqueous ammonium hydroxide (NH4OH, ammoni…

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane (C5H12, a liquid), calcium chloride (CaCl2) solution, and aqueous ammonium hydroxide (NH4OH, ammoni…

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane

1. You are given three bottles labeled a, b, AND c. The bottles contain pentane (C5H12, a liquid), calcium chloride (CaCl2) solution, and aqueous ammonium hydroxide (NH4OH, ammoni…

1. You are making a potassium phosphate buffer that has 55 mM total phosphate (w

1. You are making a potassium phosphate buffer that has 55 mM total phosphate (weighed out as KH2PO4), 183 mM KCl, and 8 mM dithiothreitol. You need 431 mL of buffer, which will b…

1. You are measuring a quantity with a measuring device on whichthe smallest sca

1. You are measuring a quantity with a measuring device on whichthe smallest scale division is 0.01 unit. A measurement appears tohave a value of exactly 3.2 units. How should you…

1. You are presented with three vials each contains a white fluffy powder. You l

1. You are presented with three vials each contains a white fluffy powder. You label the vials A, B, and C, then measure the melting point of each. The following is the data you c…

1. You are provided the following information about a municipal wastewater treat

1.      You are provided the following information about a municipal wastewater treatment plant. This plant uses the traditional activated-sludge process.  Assume the microorganis…

1. You are purifying an organic reaction using a separatory funnel. The procedur

1. You are purifying an organic reaction using a separatory funnel. The procedure requires you use dichloromethane (density 1.33g/mL) and water (density 1.00g/mL). Two colorless c…

1. You are separating anthracene from benzoic acid via an extraction between eth

1.         You are separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. How would you recover the a…

1. You are studying a molecule which can exist in either anon-degenerate singlet

1. You are studying a molecule which can exist in either anon-degenerate singlet state or a triplet state (degeneracy = 3).The triplet state is higher in energy than the singletby…

1. You are studying the kinetics of a new reaction which turns product A-> B. Ho

1. You are studying the kinetics of a new reaction which turns product A-> B. However, we know that in many cases chemical reactions are much more complicated than this. Our ne…

1. You are the senior safety officer at a facility, and there has been an accide

1. You are the senior safety officer at a facility, and there has been an accident with a radioactive isotope (^32 P). In total, 1000 mCu have been spilled in the lab. If your saf…

1. You are trying to determine the structure of the primase complex that is ~300

1. You are trying to determine the structure of the primase complex that is ~300kD. What technique might you use? Why? 2. You want a molecular picture of the Cas9 in complex with …

1. You are using the following procedure from your lab instructions to determine

1. You are using the following procedure from your lab instructions to determine the copper content of a brass sample: "Approximately 35 mg of a dried brass sample (accurately mea…

1. You begin preparation of the calibration curve to measure absorbance vs conce

1. You begin preparation of the calibration curve to measure absorbance vs concentration of FeSCN2+. To do so, you add 3.289 mL of 0.200 M Fe(NO3)3 to a cuvette and then directly …

1. You begin preparation of the calibration curve to measure absorbance vs conce

1. You begin preparation of the calibration curve to measure absorbance vs concentration of FeSCN2+. To do so, you add 3.289 mL of 0.200 M Fe(NO3)3 to a cuvette and then directly …

1. You can accelerate electrons by placing them between charged plates (often us

1. You can accelerate electrons by placing them between charged plates (often used in microscopes), consider an electron between two plates with a 163 volt charge across the plate…

1. You decide that your chemistry professor is going down, for that test he gave

1. You decide that your chemistry professor is going down, for that test he gave you! So you decide to give him a lead plated spoon (lead is not good for you). You use a battery w…

1. You dissolve acetic acid (HC 2 H 3 O 2 ) in water and measure the concentrati

1. You dissolve acetic acid (HC2H3O2) in water and measure the concentration of hydrogen ions (H+). The concentration H+ in the solution is found to be 0.069 M. Determine the conc…

1. You extracted compound 1 from the solution containing the 3 compund mixture b

1. You extracted compound 1 from the solution containing the 3 compund mixture by first adding 3M HCl into the methylene chloride solution, followed by 6M NaOH. Please explain cle…

1. You have 22.1 moles of nitric acid (HNO3). How many oxygen atoms do you have?

1. You have 22.1 moles of nitric acid (HNO3). How many oxygen atoms do you have? 2. The reaction shown below shows that silver nitrate reacts with sodium chloride to make silver c…

1. You have a container that has a volume of 1 liter, and holds 1 mole of helium

1. You have a container that has a volume of 1 liter, and holds 1 mole of helium gas. You compress this container to a new volume of 0.5 liters. No gas escapes. What happens, and …

1. You have a freshly prepared, degassed, buffered solution at pH 8.0 in a beake

1. You have a freshly prepared, degassed, buffered solution at pH 8.0 in a beaker. When you add a few drops of bromothymol blue indicator, the solution turns blue. You place a sti…

1. You have a solution of 0.01962 M zinc(II) chloride. (a) How many moles of sol

1. You have a solution of 0.01962 M zinc(II) chloride. (a) How many moles of solute are contained in 45.73 mL of solution? (b) How many grams of solute are contained in 45.73 mL o…

1. You have a solution of 0.430 M sulfuric acid solution and a solution of KOH w

1. You have a solution of 0.430 M sulfuric acid solution and a solution of KOH whose concentration you want to determine. At the end of the reaction, you find that you have used 1…

1. You have an unknown dye solution whose concentration seems to lie between 0.0

1. You have an unknown dye solution whose concentration seems to lie between 0.0006M stock solution and a 0.0004 stock solution. Therefore, you had planned to dilute the 0.0006M s…

1. You have an unknown dye solution whose concentration seems to lie between 0.0

1. You have an unknown dye solution whose concentration seems to lie between 0.0006M stock solution and a 0.0004 stock solution. Therefore, you had planned to dilute the 0.0006M s…

1. You have an unknown dye solution whose concentration seems to lie between 0.0

1. You have an unknown dye solution whose concentration seems to lie between 0.0006M stock solution and a 0.0004 stock solution. Therefore, you had planned to dilute the 0.0006M s…

1. You have been employed at a local manufacturing company. In the back of an ol

1. You have been employed at a local manufacturing company. In the back of an old storage shed you find a 10 L bottle containing a pure-phase, liquid solvent. On reaching to the b…

1. You have been employed at a local manufacturing company. In the back of an ol

1. You have been employed at a local manufacturing company. In the back of an old storage shed you find a 10 L bottle containing a pure-phase, liquid solvent. On reaching to the b…

1. You have been given the task of identifying the composition of an ancient met

1. You have been given the task of identifying the composition of an ancient metal coin which seems to be composed of a yellowish metal. Suggest what you might do to learn the ide…

1. You have been hired as a consultant to a legal firm. Part of your assignment

1. You have been hired as a consultant to a legal firm. Part of your assignment is to determine the size of a rotary vacuum drum filter purchased in 1984 (CEPCl 323) before comput…

1. You have four related molecules, XA (mw =140), XB (mw = 100), XC (mw = 80) an

1. You have four related molecules, XA (mw =140), XB (mw = 100), XC (mw = 80) and XD (mw = 120). None of the four molecules can hydrogen bond. During the evaporation of XB, |?T| =…

1. You have the following supplies needed to build an electrochemical cell. 1.0

1. You have the following supplies needed to build an electrochemical cell. 1.0 M Co2+ solution, a strip of solid Co, 1.0 M Ag+ solution, a strip of solid Ag, salt bridge a. Write…

1. You have three hypothetical (please note, these are not REAL) elements, X, Y,

1.You have three hypothetical (please note, these are not REAL) elements, X, Y, and Z, with the following electronegativity values: X = 0.6 Y = 3.2 Z = 3.5 Please note that X, Y, …

1. You isolated the following compounds in lab and observed the melting points i

1. You isolated the following compounds in lab and observed the melting points in the table below judge the purity of cach compound. compound observed mp literature value for mp a…

1. You make a 2.00L solution of sodium acetate by adding 45.6 g of solid sodium

1. You make a 2.00L solution of sodium acetate by adding 45.6 g of solid sodium acetate to water. What is the pH of the solution? 2. Dinitrogen tetroxide partially decomposes acco…

1. You make a buffer solution containing 5.342 g of NaF and 3.245 g of HF (pKa=

1. You make a buffer solution containing 5.342 g of NaF and 3.245 g of HF (pKa= 3.17) in 1.00 L of H2O. What is the approximate pH of the buffer? A) 0.50 B) 1.00 C) 3.06 D) 3.17 E…