Chemistry concepts and calculations

1. Retention time (tR) is a measure of how long a compound is retained on a stat

1. Retention time (tR) is a measure of how long a compound is retained on a stationaryphase in column in column chromatography. In TLC, Rf was a measure of how long thecompound wa…

1. Review Experiments 3, 5, 6, and 7 2. Read carefully the to Adhere\" for Labor

1. Review Experiments 3, 5, 6, and 7 2. Read carefully the to Adhere" for Laboratory Practical 1. 3. Set up your notebook with objectives, materials, and a clear scheme (flowchart…

1. Review your answers about the conductivity of solid sodium chloride (NaCI), c

1. Review your answers about the conductivity of solid sodium chloride (NaCI), calcium phosphate (Cas(PO)2), sucrose (C12H22011), and their aqueous solutions on page 4 in your lab…

1. Review your answers about the conductivity of solid sodium chloride (NaCI), c

1. Review your answers about the conductivity of solid sodium chloride (NaCI), calcium phosphate (Cas(PO)2), sucrose (C12H22011), and their aqueous solutions on page 4 in your lab…

1. Rewrite the ideal gas law equation to solve for: a) pressure, b) number of mo

1. Rewrite the ideal gas law equation to solve for: a) pressure, b) number of moles, and c) temperature 2. What is the purpose of the graduated cylinder in the collection of hydro…

1. Rolls of aluminum foil are 301 mm wide and 0.017 mm thick. What maximum lengt

1. Rolls of aluminum foil are 301 mm wide and 0.017 mm thick. What maximum length of aluminum foil can be made from 0.94 kg of aluminum?( d(aluminum)=2.70 g/cm3) Express your answ…

1. Rubidium metal has a body-centered cubic structure. The density of the metal

1. Rubidium metal has a body-centered cubic structure. The density of the metal is 1.532 g/cm3. Calculate the radius of the rubidium atom. Assume that rubidium atoms are spheres. …

1. STEP 1: Determine amount of water in the coordination compound: a. Given the

1. STEP 1: Determine amount of water in the coordination compound: a. Given the exact mass that you weighed out in step 1.1, convert this mass of K3[Fe(C2O4)3]•3H2O into moles of …

1. Sarin is a synthetic, volatile neurotoxin that can enter the body through the

1. Sarin is a synthetic, volatile neurotoxin that can enter the body through the eyes, skin, lungs, and Gl tract. Early symptoms of sarin exposure include watery eyes and constric…

1. Say that 150 mL of a 1.50 M NaOH solution with a mass of 151 grams is added t

1. Say that 150 mL of a 1.50 M NaOH solution with a mass of 151 grams is added to 250 mL of a 1.00 M HCl solution with a mass of 252 grams in a coffee cup calorimeter. Before the …

1. Say true or false and provide the chemical basis for your answer. (a) The spe

1. Say true or false and provide the chemical basis for your answer. (a) The specific rotation of a compound is independent of any other parameters. (b) The concentration of a liq…

1. Science replaces old explanations and theories when A. new explanations and t

1. Science replaces old explanations and theories when A. new explanations and theories receive greater support. B. they are proven to be completely false. C. new explanations and…

1. Scientists believe they know the average global temperature over the last 160

1.         Scientists believe they know the average global temperature over the last 160,000 years. Which property of                the ice core samples from Antarctica provides …

1. Sea water is a homogeneous solution containing salts and water. Answer: _____

1. Sea water is a homogeneous solution containing salts and water. Answer: _______ 2. In the solution process, the breaking of solute particles is an endothermic process because e…

1. Seawater contains approximately 3.5%NaCl by mass and has a density of 1.02 g/

1. Seawater contains approximately 3.5%NaCl by mass and has a density of 1.02 g/mL. What volume of seawater contains 9.0 g of sodium? 2. Methanethiol (CH4S) has a disagreeable odo…

1. See the steps of inserting 50, 87, 50, 26, 52, 55, 13, 16, 28, 11, 20, 30 int

1. See the steps of inserting 50, 87, 50, 26, 52, 55, 13, 16, 28, 11, 20, 30 into a red-black tree. Draw the trees after you inserting each value, use the color change or rotation…

1. Select all of the correct statements about reaction rates from the choices be

1. Select all of the correct statements about reaction rates from the choices below. (a) The lower the rate of a reaction the longer it takes to reach completion. (b) The fastest …

1. Select all that apply. An enzyme -is a carbohydrate -is a protein -is a biolo

1. Select all that apply. An enzyme -is a carbohydrate -is a protein -is a biological catalyst -is changed by reaction with a substrate -is not altered by reaction with a substrat…

1. Select an appropriate description for the structure of the peptide bonds in p

1. Select an appropriate description for the structure of the peptide bonds in proteins? Select the single best answer. A. Each peptide bond contains one C-O bond and one N-H bond…

1. Select correct description of a bromonium ion. a. an ion with the formula Br2

1. Select correct description of a bromonium ion. a. an ion with the formula Br2 b. a cationic molecule with the general formula R–Br+ c. a cationic molecule with the general form…

1. Select the false statement below. 3. Which one of the following ions has the

1. Select thefalsestatement below. 3. Which one of the following ions has the same number of electrons and neutrons? A. Calcium typically exists as Ca2+ionswhen combined with nonm…

1. Select the false statement below. 3. Which one of the following ions has the

1. Select thefalsestatement below. 3. Which one of the following ions has the same number of electrons and neutrons? A. Calcium typically exists as Ca2+ionswhen combined with nonm…

1. Select the letter label from the diagram which represents the activation ener

1.Select the letter label from the diagram which represents the activation energy (Ea) for the reaction. 2.Select the letter label from the diagram which corresponds to the positi…

1. Select the physical properties of liquids and solids that are controlled prim

1. Select the physical properties of liquids and solids that are controlled primarily by how tightly packed the particles are. Choices: Evaporation, sublimation, wetting of a surf…

1. Select the statement about the B. The ortical point is shown by D. It is not

1. Select the statement about the B. The ortical point is shown by D. It is not possible or this substance to transition trom phase diagam hat is true is a phese dagram of waner s…

1. Select the statement about the B. The ortical point is shown by D. It is not

1. Select the statement about the B. The ortical point is shown by D. It is not possible or this substance to transition trom phase diagam hat is true is a phese dagram of waner s…

1. Select the statement that is NOT true about venting during an extraction. A.T

1. Select the statement that is NOT true about venting during an extraction. A.The separatory funnel stem should not be pointed towards any person while venting. B. The stopper mu…

1. Select three reasons your beta-carotene would not be the first pigment to elu

1. Select three reasons your beta-carotene would not be the first pigment to elute off the column (Only select one of the following answers) -the sample was not concentrated after…

1. Several different combinations of solvents have been used for TLC so far. For

1. Several different combinations of solvents have been used for TLC so far. For example, 80% ethyl acetate/20% hexanes was chosen for the TLC separation of analgesics. Consider t…

1. Short programming assignment. Implement the binary quicksort where Item is an

1. Short programming assignment. Implement the binary quicksort where Item is an integer in the range 0 - 32,767 (that is, fifteen bits). You will need to write a digit function t…

1. Show by induction that: (1-x)(1+x+x 2 + x 3 +…+ x n = 1- x n-1 for n >=0 2. C

1. Show by induction that: (1-x)(1+x+x2 + x3 +…+ xn = 1- xn-1 for n >=0 2. Consider the following argument: If it is raining then the courts are closed The courts are open ----…

1. Show how to free up the name of a single variable which has been already assi

1. Show how to free up the name of a single variable which has been already assigned a definition. Assign any random value between 0 and 10 to k. Clear the value stored in k with …

1. Show structures for the products that would be expected for the reaction belo

1. Show structures for the products that would be expected for the reaction below (note: in A? n-butyllithium is a very strong base). 2. Fill in the blanks in the equation below t…

1. Show that (Eq. 3) of our synthesis involves an oxidation of the copper by ass

1. Show that (Eq. 3) of our synthesis involves an oxidation of the copper by assigning the appropriate oxidation states, and writing out each half reaction 2. Eq. of our synthesis…

1. Show the calculation of theoretical and percentage yield, paying attention to

1. Show the calculation of theoretical and percentage yield, paying attention to units and significant figures. Discuss the yield you obtained and how it could be improved 2. From…

1. Show your calculations for preparing the following solutions: 200 ml of 20% (

1. Show your calculations for preparing the following solutions: 200 ml of 20% (w/v) NaOH, 1 liter of 1.0 M Tris [molecular weight (MW) 121.1 g/mol], and 100 ml of 0.2 M EDTA (MW …

1. Shown below are the results from two 3-elimination reactions attempted by Joe

1. Shown below are the results from two 3-elimination reactions attempted by Joe Izzo in the Vetticatt Lab to make 3,3-dimethylbut-1-ene. Reaction # 1 failed miserably and gave hi…

1. Shown below is the absorbance spectrum of CBBG in the presence of a large exc

1. Shown below is the absorbance spectrum of CBBG in the presence of a large excess of BSA. The x axis shows wavelength (in nm) and the y-axis is absorbance - the y-axis is arbitr…

1. Silver chlo ride is not soluble in water. What are the relative strengths of

1. Silver chlo ride is not soluble in water. What are the relative strengths of the intermolecular forces between Ag' ons and water molecules as compared to the intermolecular for…

1. Silver iodate is considered insoluble and magnesium iodate is considered solu

1. Silver iodate is considered insoluble and magnesium iodate is considered soluble. The solubility product of AgIO3 is 3.1 x 10-8. If 310.6 mL of a Mg(IO3)2 solution with a molar…

1. Simple Molarity Problems a. the moles of HF in 275 mL of g. the volume of 11.

1. Simple Molarity Problems a. the moles of HF in 275 mL of g. the volume of 11.7 M KCIO, containing 16.5 g of KCIO 0.65 M HF ans. ans. b. the volume of 1.3 M sulfuric acid h. the…

1. Single Replacement Reactions- Write the correctly balanced chemical cquation

1. Single Replacement Reactions- Write the correctly balanced chemical cquation for each and write which element is more active. Be sure to include state labels on your equations.…

1. Siver nitrate is sadded to a solution containing an unknown salt. An off-whit

1. Siver nitrate is sadded to a solution containing an unknown salt. An off-white colored precipitate forms. Nitric acid is added to the mixture, the precipitate dissolves and a g…

1. Small quantities of oxygen can be prepared in the laboratory by heating potas

1.Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO3(s). The equation for the reaction is 2. Lithium nitride reacts with water to pr…

1. Sodium and potassium have similar chemical and physical properties. This is b

1. Sodium and potassium have similar chemical and physical properties. This is best explained by the fact that both element: A. have relatively low first ionization energies. B. h…

1. Sodium and potassium have similar chemical and physical properties. This is b

1. Sodium and potassium have similar chemical and physical properties. This is best explained by the fact that both elements A.have low relative atomic masses. B.are in Period 1 o…

1. Sodium carbonate is often added to laundry detergents to soften hard water an

1. Sodium carbonate is often added to laundry detergents to soften hard water and make the detergent more effective. Suppose that a particular detergent mixture is designed to sof…

1. Sodium chlorate is heated to form sodium chloride and oxygen. The mass of the

1. Sodium chlorate is heated to form sodium chloride and oxygen. The mass of the dry, empty crucible and cover is 24.6382 grams. The mass of the crucible, cover and sodium chlorat…

1. Sodium oxide reacts with water to produce sodium hydroxide. Suppose 19.6 g of

1. Sodium oxide reacts with water to produce sodium hydroxide. Suppose 19.6 g of sodium oxide is combined with 30.8 g of water. When the reaction is complete, all the sodium oxide…

1. Sodium salts give off a characteristic yellow orange light when added to the

1. Sodium salts give off a characteristic yellow orange light when added to the flame of a Bunsen burner. This yellow orange color is due to two narrow bands of radiation with wav…