Chemistry concepts and calculations

1. What is the purpose of ethereal solvents in Grignard reactions? a) increase k

1. What is the purpose of ethereal solvents in Grignard reactions? a) increase kinetics b) stabilize R-Mg-X complex c) catalytically involved in the mechanism d) reduce toxicity e…

1. What is the purpose of making derivatives of unknowns? 2. Why are 2,4-dinitro

1. What is the purpose of making derivatives of unknowns? 2. Why are 2,4-dinitrophenylhydrazones better derivatives than 3. Using chemical tests, how would you distinguish among 2…

1. What is the purpose of sodium hydroxide in the reaction of reducing vanillin

1. What is the purpose of sodium hydroxide in the reaction of reducing vanillin to vanillyl alcohol? all my book says is that sodium borohydride reductions are commonly carried ou…

1. What is the purpose of the cotton and the sand at the bottom of the chromatog

1. What is the purpose of the cotton and the sand at the bottom of the chromatography column? 2. Why is it important not to let the column go dry? 3. What is the purpose of the sa…

1. What is the purpose or function of the ninhydrin solution? A) It is a visuali

1. What is the purpose or function of the ninhydrin solution?             A) It is a visualizing agent used during TLC analysis             B) It is used as a protecting agent for…

1. What is the rank of alkaline earth metals by solubility, from most soluble to

1. What is the rank of alkaline earth metals by solubility, from most soluble to least soluble ( Mg(NO3)2, Ca(NO3)2, Sr(NO3)2, Ba(NO3)2 2. What is the net ionic equation for each …

1. What is the relationship between pressure and the volume of a gas (assume con

1. What is the relationship between pressure and the volume of a gas (assume constant temperature)? 2. What is the relationship between the temperature and the volume of a gas (as…

1. What is the relationship between wavelength and frequency? What is the name o

1. What is the relationship between wavelength and frequency? What is the name of the constant of proportionality used in the relationship between wavelength and frequency, and wh…

1. What is the strongest reducing agent? Na F^- Fe^2+ Cd Fe^3+ 2. Balance the fo

1. What is the strongest reducing agent? Na F^- Fe^2+ Cd Fe^3+ 2. Balance the follow redox rxn. what are the coefficients in front of Cr & Cl2 in the balanced rxn? Cr (s) + Cl…

1. What is the structure of the American system of government based on? 2. Which

1. What is the structure of the American system of government based on? 2. Which Enlightenment philosopher had the largest impact on the American founders? 3. In what order did th…

1. What is the temperature of 0.53mol of gas at a pressure of 1.1atm and a volum

1. What is the temperature of 0.53mol of gas at a pressure of 1.1atm and a volume of 12.6L ? 2. A cylinder contains 30.0L of oxygen gas at a pressure of 1.9atm and a temperature o…

1. What is the term for a pure substance that can be broken down into two or mor

1.     What is the term for a pure substance that can be broken down into two or more substances by chemical reaction? A) compound B) element C) homogeneous D) matter E) none of t…

1. What is the term for the process by which bedrock breaks down to become the m

1. What is the term for the process by which bedrock breaks down to become the mineral component of soil? A. Eutrophication B. Weathering C. Leaching D. Tropography 2. What sort o…

1. What is the theoretical yield of chromium that can be produced by the reactio

1. What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr203 with 8.00 g of aluminum according to the equation 2Al+Cr2O3--->Al2O3 + 2cr.…

1. What is the total kinetic energy of 0.5 mol of an ideal monatomic gas confine

1. What is the total kinetic energy of 0.5 mol of an ideal monatomic gas confined to 5.0 dm^3 at 150 kPa? 2. Compare the pressures predicted for 0.6 dm^3 of Cl2 weighing 18.5 g at…

1. What is the total molar concentration of ions in a 0.350 Msolution of the str

1. What is the total molar concentration of ions in a 0.350 Msolution of the strong electrolyte Na2SO4,assuming complete dissociation? 2. What is the molar concentration of Br- io…

1. What is the total vapor pressure at 20.0 *C of a liquid solution containing b

1. What is the total vapor pressure at 20.0 *C of a liquid solution containing benzene and toluene? The mole fraction of benzene is 0.750. Assume that Raoult's law holds for each …

1. What is the unit that forms the basis of the glycogen polymer? a) The six-mem

1. What is the unit that forms the basis of the glycogen polymer? a) The six-membered form of galactose b) The five-member ring of form of fructose c) The six-membered ring form o…

1. What is the value of q n k) when 21.9 g of liquid water is cooled from 0.00 d

1. What is the value of q n k) when 21.9 g of liquid water is cooled from 0.00 degree C to ice at -7.03 degree C?Please report your answer to the correct number of significant fig…

1. What is the volume occupied by 16.6g of argon gas at a pressure of 1.16atm an

1. What is the volume occupied by 16.6g of argon gas at a pressure of 1.16atm and a temperature of 374K ? Express your answer with the appropriate units. 2. A weather balloon is i…

1. What is the volume of a face centered cubic unit cell made up of atoms having

1. What is the volume of a face centered cubic unit cell made up of atoms having a radius of 1.00 x 10-8 cm? 2. How many joules are required to raise the temperature of 7.5 g of w…

1. What is the weight percent of phosphorus in anhydrous potassium dihydrogen ph

1. What is the weight percent of phosphorus in anhydrous potassium dihydrogen phosphate? 2. 0.1075 g of anhydrous potassium dihydrogenphosphate are used to prepare 500 mL of the 5…

1. What is the weight percent of phosphorus in anhydrous potassium dihydrogen ph

1. What is the weight percent of phosphorus in anhydrous potassium dihydrogen phosphate? 2. 0.1075 g of anhydrous potassium dihydrogenphosphate are used to prepare 500 mL of the 5…

1. What is wrong with the following Do While loop? Dim index As Integer = 1 Do W

1.      What is wrong with the following Do While loop? Dim index As Integer = 1 Do While index <> 9 lstBox.Items.Add("Hello") index += 1 Loop a.   The test variable should …

1. What isthe difference between an enzyme \"cofactor\" and an enzyme \"coenzyme

1. What isthe difference between an enzyme "cofactor" and an enzyme "coenzyme"? 2. What are the general properties of enzymes? 3. Define these: Transition state, reaction coordina…

1. What isthe difference between an enzyme \"cofactor\" and an enzyme \"coenzyme

1. What isthe difference between an enzyme "cofactor" and an enzyme "coenzyme"? 2. What are the general properties of enzymes? 3. Define these: Transition state, reaction coordina…

1. What kinds of compounds form electrolytes in solution? 2. If 13.5 g NaCI were

1. What kinds of compounds form electrolytes in solution? 2. If 13.5 g NaCI were dissolved in 250.0 g of water, what is the mass percent of NaCI in the solution? What is the mass …

1. What makes fractional distillation more effective than simple distillation in

1. What makes fractional distillation more effective than simple distillation in separate components in a mixture? When would you use fractional distillation instead of simple dis…

1. What mass of pure sulfuric acid (molar mass = 98.09 g/mol) is needed to produ

1. What mass of pure sulfuric acid (molar mass = 98.09 g/mol) is needed to produce 1L of aqueous sulfuric acid solution with pH=2? 2. Using standard bond enthalpies, predict wheth…

1. What minerals are most common in detrital (clastic) sedimentary rocks? Why ar

1. What minerals are most common in detrital (clastic) sedimentary rocks? Why are these minerals so abundant? 2. How are the degree of sorting and the amount of rounding related t…

1. What molecules give paprika oleoresin its color and what reactions can they u

1. What molecules give paprika oleoresin its color and what reactions can they undergo over storage? What reactions can happen during thermal processing? What is the effect of wat…

1. What natural resources produce carbondioxide as a waste product when they are

1. What natural resources produce carbondioxide as a waste product when they are burned? 2. Why are green house gases consideredpollution? 3. What is one thing you could do todecr…

1. What outcome do you expect for the reaction below? Please explain A. sodium a

1. What outcome do you expect for the reaction below? Please explain A. sodium acetate and 3-bromotoluene B. tribromomethane and sodium benzoate C. bromobenzene and ethanal D. tri…

1. What parameter must remain the same for k to be a constant in the rate law eq

1. What parameter must remain the same for k to be a constant in the rate law equation? a) temperature b) pressure c) volume d) activation energy 2. Which is not an important char…

1. What percent error does the neglect of the calorimeter constant introduce int

1. What percent error does the neglect of the calorimeter constant introduce into your results for the specific heat of copper? 2. Briefly discuss whether the following experiment…

1. What predicts the optimum pressure for a football to make perfect passes? A.

1. What predicts the optimum pressure for a football to make perfect passes? A. Remember, as one of the first steps in planning your investigation, you may need to narrow your ori…

1. What purpose does sodium carbonate serve during the extraction of caffeine fr

1. What purpose does sodium carbonate serve during the extraction of caffeine front tea leave? 2. What purpose does a 1 -cm layer of anhydrous sodium sulfate in the apex of the fu…

1. What purpose is served by filtering the milk sample after the addition of aci

1. What purpose is served by filtering the milk sample after the addition of acid? 2. Many cheese making processes use enzymes instead of acid to help create cheese. What purpose …

1. What quantity of sulfur dioxide, SO2 (64.0 g\'mole), is produced when 245 g o

1. What quantity of sulfur dioxide, SO2 (64.0 g'mole), is produced when 245 g of sulfuric acid, H2S04 (98.0 g/mole) reacts completely with zinc metal? Zn° + 2 H2SO4 ZnSO4 + SO2 + …

1. What quantity of sulfur dioxide, SO2 (64.0 g\'mole), is produced when 245 g o

1. What quantity of sulfur dioxide, SO2 (64.0 g'mole), is produced when 245 g of sulfuric acid, H2S04 (98.0 g/mole) reacts completely with zinc metal? Zn° + 2 H2SO4 ZnSO4 + SO2 + …

1. What reagents can be used to prepare HC-NH-CH3 II O A) Ethanoic anhydride and

1. What reagents can be used to prepare HC-NH-CH3                                                                      II                                                          …

1. What term describes the addition of two groups across a double bond if the gr

1. What term describes the addition of two groups across a double bond if the groups end up on opposite sides of the molecule? A. Anti B. Syn C. Saturated D. Unsaturated 2. What i…

1. What term is applied to the following phase change? A(g) A(s) sublimation fre

1. What term is applied to the following phase change? A(g) A(s) sublimation freezing fusion deposition 2. A hypothetical substance has a melting point of -10°C and a boiling poin…

1. What type of ch points) nerve cells? (6 2. What kind of messenger is insulin?

1. What type of ch points) nerve cells? (6 2. What kind of messenger is insulin? (6 pints) 3,. What disease is associated with a decrease in the amount of dopamine in the brain? (…

1. What type of intermolecular force is predominant in the following two compoun

1. What type of intermolecular force is predominant in the following two compounds? H3C -C-CH3 H3C- CH-CH (3 points) 2. Hydrazine (NH2NH2), hydrogen peroxide (HooH), and water (H2…

1. What type of reaction links two amino acids into a dipeptide? 2. What functio

1. What type of reaction links two amino acids into a dipeptide? 2. What functional groups are found in the peptide backbone? 3. Would a peptide in solution be vulnerable to cleav…

1. What type or types of intermolecular forces are present between linear molecu

1. What type or types of intermolecular forces are present between linear molecules of H-CEC-H? A) dispersion forces B) dipole forces C) dispersion and dipole forces D) hydrogen b…

1. What virtual force\' acts on an air mass when the air mass moves in a North-S

1. What virtual force' acts on an air mass when the air mass moves in a North-South direction? a. Centripetal force. b. Centrifugal force c, Hadley force. d, Coriolis effect. 2. W…

1. What volume (in Liters) of oxygen must react to form 4.0L of carbon dioxide a

1. What volume (in Liters) of oxygen must react to form 4.0L of carbon dioxide according to the following balanced equation: 2CO(g) + O2(g) --> 2CO2(g) Assume an excess of CO a…

1. What volume in mililiters of a 0.111 M NaOH solution is required to reach the

1. What volume in mililiters of a 0.111 M NaOH solution is required to reach the equivalance point in the complete titration of a 9.00 ml sample of 0.122 M H2SO4? 2. A solution ha…