Chemistry concepts and calculations

1. You may use any source you want. Explain how (a) a column of mercury can be u

1. You may use any source you want. Explain how (a) a column of mercury can be used as a barometer (b) the significance of the value "760 mm Hg," (e) to convert pressured measured…

1. You must water a plant not only to keep it hydrated but to provide a source o

1. You must water a plant not only to keep it hydrated but to provide a source of electrons for the light reactions. a.) True  b.) False 2. Buildup of the pH gradient can occur in…

1. You need to create AD trusts to access network resources in which of the foll

1. You need to create AD trusts to access network resources in which of the following circumstances? 2. Forest trusts are transitive by default 3. In Windows Server 2012 R2, which…

1. You need to dissolve CaCl2 in water to make a mixture that is 41.5% calcium c

1. You need to dissolve CaCl2 in water to make a mixture that is 41.5% calcium chloride by mass. If the total mass of the mixture is 883.2 g, what masses of CaCl2 and water should…

1. You need to make an aqueous solution of 0.241 M chromium(II) bromide for an e

1. You need to make an aqueous solution of 0.241 M chromium(II) bromide for an experiment in lab, using a 125 mL volumetric flask. How much solid chromium(II) bromide should you a…

1. You need to prepare 1.000 L of 0.50 M phosphate buffer, pH=6.21. Use the Hend

1. You need to prepare 1.000 L of 0.50 M phosphate buffer, pH=6.21. Use the Henderson-Hasselbalch equation with a value of 6.64 for pK2 to calculate the quantities of K2HPO4 and K…

1. You observed the relative reactivity of the following metals. a. Hg reacts wi

1. You observed the relative reactivity of the following metals. a. Hg reacts with HNO3 but not with HCl, hot or cold water. b. Al reacts slowly with hot (100 deg C) water. c. Sr …

1. You placed your dirty fingerprints on the cuvet while determining the %T for

1. You placed your dirty fingerprints on the cuvet while determining the %T for the test solutions. Explain why this error in technique results in the moles of Fe compound being r…

1. You receive a mixture of two dyes in lab with directions to determine the qua

1. You receive a mixture of two dyes in lab with directions to determine the quantity of each dye in the solution. You receive standard curves for all four dyes and the absorbance…

1. You run an LDH assay on one of your samples, and obtain an activity of 1.5 A/

1.     You run an LDH assay on one of your samples, and obtain an activity of 1.5 A/min. You then dilute the sample 1:10, and obtain an activity of 1.2 A/min. Is this the activity…

1. You will be writing a simple Java program that counts the words in a String.

1. You will be writing a simple Java program that counts the words in a String. A "skelton" of this code is provided in the file given in the instructions above. You will see that…

1. You will investigate three reactions in this experiment. In the space provide

1. You will investigate three reactions in this experiment. In the space provided below, write the balanced molecular and net ionic equations from the descriptions of the reaction…

1. You will prepare 100 mL of 100 ppm caffeine (MW 194.19 g/mol) in methanol. Th

1. You will prepare 100 mL of 100 ppm caffeine (MW 194.19 g/mol) in methanol. This process requires _________ g of caffeine to be transferred to a 100 mL volumetric flask. a.10 b.…

1. You wish to prepare 184 grams of 3.45% NH4Cl. U will need ___ grams of ammoni

1. You wish to prepare 184 grams of 3.45% NH4Cl. U will need ___ grams of ammonium chloride and __mL of water. * density of water is 1.00 g/mL 2. How many grams of KCH3COO are the…

1. You work for a crafts supply company, KidKrafts, making calcium carbonate for

1. You work for a crafts supply company, KidKrafts, making calcium carbonate for their chalk products. They have recently decided to add plaster of Paris as one of their products.…

1. You work in a forensic laboratory and are given an unknown substance, a dirty

1. You work in a forensic laboratory and are given an unknown substance, a dirty yellow powdery solid, and asked to evaluate its purity and to determine whether it might be identi…

1. You work in a forensic laboratory and are given an unknown substance, a pale

1. You work in a forensic laboratory and are given an unknown substance, a pale green crystalline solid, and asked to evaluate its purity and to determine whether it might be iden…

1. Your observations should reveal a difference in at least one property between

1. Your observations should reveal a difference in at least one property between sodium benzoate and benzoic acid. What property was that, and what observation will reveal the dif…

1. Your observations should reveal a difference in at least one property between

1. Your observations should reveal a difference in at least one property between sodium benzoate and benzoic acid. What property was that, and what observation will reveal the dif…

1. Your observations should reveal a difference in at least one property between

1. Your observations should reveal a difference in at least one property between sodium benzoate and benzoic acid. What property was that, and what observation will reveal the dif…

1. Your observations should reveal a difference in at least one property between

1. Your observations should reveal a difference in at least one property between sodium benzoate and benzoic acid. What property was that, and what observation will reveal the dif…

1. Your roommate brings home a bag of cookies, and before you know it, you’ve ea

1. Your roommate brings home a bag of cookies, and before you know it, you’ve eaten the whole package. You console yourself with the fact that the cookies were fat free. According…

1. Za^+ PO_4^rightarrow _____ 2. Ca^2+ + PO_4^3- rightarrow _____ 3. Cu^2+ + PO_

1. Za^+ PO_4^rightarrow _____ 2. Ca^2+ + PO_4^3- rightarrow _____ 3. Cu^2+ + PO_4^rightarrow _____ 4. A2! + PO_4^2- rightarrow _____ 5. Co^2+ + PO_4^3- rightarrow _____ 6. Zn^2+ +…

1. Zn + 2HCl --> ZnCl 2 + H 2 Consider the reaction between 0.1 mol Zn and and 0

1.   Zn + 2HCl --> ZnCl2 + H2       Consider the reaction between 0.1 mol Zn and and 0.1 mol HCl and choose the correct statement below. a. no zinc solid remains at the end of …

1. Zn( s )+HNO3( a q )?Zn(NO3)2( a q )+H2( g ) Express your answer as a chemical

1. Zn(s)+HNO3(aq)?Zn(NO3)2(aq)+H2(g) Express your answer as a chemical equation. Identify all of the phases in your answer. 2. Al(s)+H2SO4(aq)?Al2(SO4)3(aq)+H2(g) Express your ans…

1. Zoltan Mesko decides to implement a Java stack using a void version of pop. (

1. Zoltan Mesko decides to implement a Java stack using a void version of pop. (If the user wants to see what's on top, they need to use peek instead.) Which trio of denitions for…

1. [15 points Question #1 Flucloxacillin is a narrow-spectrum beta- lactam antib

1. [15 points Question #1 Flucloxacillin is a narrow-spectrum beta- lactam antibiotic of the penicillin class. Its structure is shown on the right. Answer the following questions …

1. [20] A small building that shelters a water supply pump measures 2 m ×3 m ×2.

1. [20] A small building that shelters a water supply pump measures 2 m ×3 m ×2.4 m high. It is constructed of 1-cm thick wood having a thermal conductivity of 0.126 Wm-1 K -1 . T…

1. [5 points] State the formula for computing the sample variance. What type of

1. [5 points] State the formula for computing the sample variance. What type of measures (distribute, algebraic, or holistic) is the sample variance? What about mode? Explain your…

1. [50 points] This course places special emphasis upon the methodologies and te

1. [50 points] This course places special emphasis upon the methodologies and technologies that you will need to use in the near future. These include: parallel (multi-core) and G…

1. [6 Points] Ind T F Th icate whether each of the following statements are true

1. [6 Points] Ind T F Th icate whether each of the following statements are true or false: e majority of generation reactions are second-order F H eat transfer by conduction requi…

1. [6 Points] Ind T F Th icate whether each of the following statements are true

1. [6 Points] Ind T F Th icate whether each of the following statements are true or false: e majority of generation reactions are second-order F H eat transfer by conduction requi…

1. [spectroscopy and chemical dyes] A compound with molecular mass 292.16 g/mol

1. [spectroscopy and chemical dyes] A compound with molecular mass 292.16 g/mol was dissolvedin a 5 mL volumetric flask. A 1.00 mL aliquot was withdrawn, placed in a 150.0 mL volu…

1. \"After cleaning and filling your buret, you take an initial reading of the v

1. "After cleaning and filling your buret, you take an initial reading of the volume and determine it to be 0.25 mL. You add some of the solution to a beaker, and take a final rea…

1. \"Air\" bags for automobiles are inflated during a collision by the explosion

1. "Air" bags for automobiles are inflated during a collision by the explosion of sodium azide, NaN3. The equation for the decomposition is 2NaN3(s) 2Na(s) + 3N2(g). What mass of …

1. \"The volume of an ideal gas is directly proportional to the number of moles

1."The volume of an ideal gas is directly proportional to the number of moles of the gas at constant temperature and pressure" is a statement of _____________ Law. 2.Hydrogen gas …

1. ___ MgCl2(aq) + ____ NaOH(aq) -------> _____Mg(OH)2(s) + _____ NaCl(aq) a. Ba

1. ___ MgCl2(aq) + ____ NaOH(aq) -------> _____Mg(OH)2(s) + _____ NaCl(aq) a. Balance the chemical equation above. MW magnesium hydroxide = 58.32 grams per mole. b. Write the e…

1. ____ Ca (s) + ____ H2O (l) --> 2. ____ Mg (s) + ____ H2O (l) --> 3. ____ Al (

1. ____ Ca (s) + ____ H2O (l) --> 2. ____ Mg (s) + ____ H2O (l) --> 3. ____ Al (s) + ____ H2O (l) ---> 4.____ Zn (s) + ____ HCl (l) ---> 5. ____ Pb (s) + ____ HCl (l) …

1. ____ Exposing a molecule in state n to electromagnetic radiation of frequency

1. ____ Exposing a molecule in state n to electromagnetic radiation of frequency = (En – Em)/h will increase the probability that the molecule will make a transition to the lower …

1. a . 2-propanol has a density of 0.785. Calculate the mg in 1500 uLs of 2-prop

1.a. 2-propanol has a density of 0.785. Calculate the mg in 1500 uLs of 2-propanol.; Calculate the moles of 2-propanol in 1500 uLs. b.. A dehydration reaction calls for 200 mmoles…

1. a 4.0 g mass of NaOH is dissolved in 5 mL of water. determine the aproximate

1. a 4.0 g mass of NaOH is dissolved in 5 mL of water. determine the aproximate molar concentration of the NaOH. 2. refer to question 1 , if 4 Ml of the determined concentration i…

1. a 53.8 mg sample of sodium perchlorate contains radioactive chlorine-36 ( who

1. a 53.8 mg sample of sodium perchlorate contains radioactive chlorine-36 ( whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the r…

1. a Lewis acid in water- it accepts a share of an electron pair from a water mo

1. a Lewis acid in water- it accepts a share of an electron pair from a water molecule, and CO2 gas acts as forms carbonic acid, H,Co, Carbonic acid is a weak acid: K, 42x 107. If…

1. a Lewis acid in water- it accepts a share of an electron pair from a water mo

1. a Lewis acid in water- it accepts a share of an electron pair from a water molecule, and CO2 gas acts as forms carbonic acid, H,Co, Carbonic acid is a weak acid: K, 42x 107. If…

1. a chemisty is given a white solid that is suspectedof being pure cocaine. whe

1. a chemisty is given a white solid that is suspectedof being pure cocaine. when 1.22g of the solid is dissolvedin 15.60g of benzene the feezing point is lowered by 1.32oC. calcu…

1. a pickling solution for preserving food is prepared by dissolving 270g of NaC

1. a pickling solution for preserving food is prepared by dissolving 270g of NaCl in 3.8L of water. calculate the osmolarity of the solution. 2. why are the questions for the 8th …

1. a) (2 points) Write the net ionic equation for hydrochloric acid reacting wit

1. a) (2 points) Write the net ionic equation for hydrochloric acid reacting with solid sodiurm carbonate. b) (3 points) On average, one tablet of a certain antacid contains 500.0…

1. a) A solution of 1 x 10 -8 M KOH (aq) is prepared. What is the pH of this sol

1. a) A solution of 1 x 10-8 M KOH (aq) is prepared. What is the pH of this solution? b) A phthalate buffer is prepared in which [hydrogen phthalate]= 0.047 M and [phthalic acid] …

1. a) A solution of 1 x 10 -8 M KOH (aq) is prepared. What is the pH of this sol

1. a) A solution of 1 x 10-8 M KOH (aq) is prepared. What is the pH of this solution? b) A phthalate buffer is prepared in which [hydrogen phthalate]= 0.047 M and [phthalic acid] …

1. a) Assume that phenol, C 6 H 5 OH (s), can form from C(s), O2(g) och H2(g) at

1. a) Assume that phenol, C6H5OH (s), can form from C(s), O2(g) och H2(g) at 45 C and 1 bar. Use standard enthalpies of formation and standard sntropies at 25 C to calculate the m…