Chemistry concepts and calculations

What significance did Lincoln ascribe to the Battle of Gettysburg in the last se

What significance did Lincoln ascribe to the Battle of Gettysburg in the last sentence of his speech. Why do you think this address endeared President Lincoln to many of his conte…

What simplifying assumptions do we usually make in working problems involving eq

What simplifying assumptions do we usually make in working problems involving equilibria of salts of polyprotic acids? Why are they usually valid? Answer by selecting all true sta…

What simplifying assumptions do we usually make in working problems involving th

What simplifying assumptions do we usually make in working problems involving the ionization of a polyprotic acids? Why are they usually valid? Under what conditions do they fail?…

What solvent or combination of solvents should I use to recrystallize 1,4-dichlo

What solvent or combination of solvents should I use to recrystallize 1,4-dichlorobenzene and ethyl 4-aminobenzoate? I was thinking hot water and ethanol for 1,4 dichlorobenzene, …

What species is represented by the following information? Calculate the atomic m

What species is represented by the following information? Calculate the atomic mass of silver if silver has 2 naturally occurring isotopes with the following masses and natural ab…

What specific conditions or requirements should you create your own array over u

What specific conditions or requirements should you create your own array over using std::array? Here is my background: I'm developing a small simple library that a small group of…

What spectral differences in Infra-Red absorption would be evident between a ket

What spectral differences in Infra-Red absorption would be evident between a ketone and its 2.4-DNPH derivative? loss of carbonyl peak loss of carbonyl peak, gain of imine peak lo…

What statement about heat capacity is true for biological systems but can be dea

What statement about heat capacity is true for biological systems but can be deadly if applied to other systems? d-The heat capacity of liquid water is equal to that of water vapo…

What statement best describes the following reaction? (a) this is an SN1 reactio

What statement best describes the following reaction? (a) this is an SN1 reaction; doubling the concentration of sodium methoxide will double the rate (b) this is an SN2 reaction;…

What statement correctly describe an electron when it emits light from an atom?

What statement correctly describe an electron when it emits light from an atom? The electron absorbs energy and moves from a higher to lower n value. The electron emits energy and…

What statement does NOT apply to the boiling points of alkanes? The boiling poin

What statement does NOT apply to the boiling points of alkanes? The boiling point increases as the length of the carbon chain increases. Straight chain alkanes have a higher boili…

What statement is TRUE if excess product is added to a dynamic equilibrium? Answ

What statement is TRUE if excess product is added to a dynamic equilibrium? Answer The amount of excess product will decrease. ------ The equilibrium constant will increase. -----…

What statement is TRUE if excess reactant is added to a dynamic equilibrium? Ans

What statement is TRUE if excess reactant is added to a dynamic equilibrium? Answer The equilibrium constant will decrease. The amount of excess reactant will increase. The amount…

What statement is TRUE if excess reactant is added to a dynamic equilibrium? Ans

What statement is TRUE if excess reactant is added to a dynamic equilibrium? Answer The equilibrium constant will decrease. The amount of excess reactant will increase. The amount…

What statement is TRUE if the temperature of an exothermic reaction is increased

What statement is TRUE if the temperature of an exothermic reaction is increased? Answer No change will occur. The equilibrium will shift toward the reactants. The equilibrium wil…

What statement is most correct about thermodynamic equilibrium at constant T and

What statement is most correct about thermodynamic equilibrium at constant T and P? Please explain how you solved this, I may be incorrect. What statement is most correct about th…

What steps can I take to detect if a brand new computer has been compromised? Wo

What steps can I take to detect if a brand new computer has been compromised? Would it take an actor with significant resources to compromise a system and still have it appear to …

What strain energy (in kcal/mole) is associated wit h an R:R gauche interaction?

What strain energy (in kcal/mole) is associated wit h an R:R gauche interaction? R represents the same unspecified alkyl group. Carry maximum number of significant figures to fina…

What strategies do cells use to ensure that newly replicated DNA does not contai

What strategies do cells use to ensure that newly replicated DNA does not contain errors? DNA polymerase replaces the newly replicated DNA on any chromosomes on which there are mi…

What strategy would you use to manage the releasing of versioned software to Azu

What strategy would you use to manage the releasing of versioned software to Azure cloud services (web and worker roles)? We are not looking for continuous integration. We are usi…

What stray light % will give an apparent absorbance of 1.998 with a true transmi

What stray light % will give an apparent absorbance of 1.998 with a true transmittance of 0.010? In the process of performing an analysis, you determine that you need to improve t…

What structural feature is different between a wax and a fat? A wax contains pho

What structural feature is different between a wax and a fat? A wax contains phosphate ester and a fat does not. A was contains a Carbohydrate ring and a fat does not. A fat has g…

What structure corresponds to the following spectra? Solution Molecular Formula

What structure corresponds to the following spectra?

What structure corresponds to the following spectra? Solution Molecular Formula

What structure corresponds to the following spectra?

What substances are present, and what are their masses, after the reaction of 10

What substances are present, and what are their masses, after the reaction of 10.00g of magnesium and 10.00g of oxygen. Please help. This topic is from law of constant composition

What technique can be used to separate each of the following compositions of pai

What technique can be used to separate each of the following compositions of pairs of compounds? Explain how you would carry out each separation, and indicate the property differe…

What technique(s) make crispy, golden brown French fries? Use the data as much a

What technique(s) make crispy, golden brown French fries? Use the data as much as possible to support your conclusions Group Potato Blanched? Brownness Crispness Greasy? (1-5) (1-…

What technique(s) make crispy, golden brown French fries? Use the data as much a

What technique(s) make crispy, golden brown French fries? Use the data as much as possible to support your conclusions Group Potato Blanched? Brownness Crispness Greasy? (1-5) (1-…

What temperature dependencies would be expected according to transition state th

What temperature dependencies would be expected according to transition state theory for the rate constants of the following gas phase reactions?(Assume that all vibrational parti…

What temperature-pressure combination would maximize the concentration C_5H_6? T

What temperature-pressure combination would maximize the concentration C_5H_6? Temperature Pressure (A)High High iB)High Low (C)Low High (D)Low low 28. At constant temperature and…

What term best describes the relationship of the molecules drawn below as Newman

What term best describes the relationship of the molecules drawn below as Newman projections C and D? identical compounds stereoisomers with the exact same melting point stereoiso…

What term expresses the ratio of moles of reactants and products according to th

What term expresses the ratio of moles of reactants and products according to the coefficients in the balanced chemical equation? Select one yield ratio product ratio reactant rat…

What term refers specifically to a pair of D- and L-isomers? a. geometric isomer

What term refers specifically to a pair of D- and L-isomers? a. geometric isomers b. chiral c. enantiomers d. stereoisomers e. structural isomers What term refers specifically to …

What test solution would you use to determine if Ba2+ ion werepresent in a solut

What test solution would you use to determine if Ba2+ ion werepresent in a solution known to contain either Mg2+ or Ba2+?Explain I said test solution H2SO4 because it contains a B…

What the correct expression for the equilibrium constant (K_c) for the reaction

What the correct expression for the equilibrium constant (K_c) for the reaction between carbon and hydrogen to form methane shown here? C(s) + 2 H_2(*g) CH_4(g) a) K_c = [CH_4]/[H…

What the correct expression for the equilibrium constant (K_c) for the reaction

What the correct expression for the equilibrium constant (K_c) for the reaction between carbon and hydrogen to form methane shown here? C(s) + 2 H_2(*g) CH_4(g) a) K_c = [CH_4]/[H…

What the solubility of silver iodide in a solution containing 0.20 M sodium iodi

What the solubility of silver iodide in a solution containing 0.20 M sodium iodide? The K_sp value for silver iodide is 1.5 times 10^-16. 0.20M 1.2 times 10^-8 M 30 times 10^-17 7…

What things should a programmer implementing the technical details of a web appl

What things should a programmer implementing the technical details of a web application consider before making the site public? If Jeff Atwood can forget about HttpOnly cookies, s…

What three amino acids are found in the catalytic triad of chymotrypsin? Glu, Hi

What three amino acids are found in the catalytic triad of chymotrypsin? Glu, His, Thr Ser, Arg, Cys Asp, His, Ser Cys, Lys, Glu Asn, His, Thr Of all the species that enzymes bind…

What three types of attractive forces are involved in solution formation? Explai

What three types of attractive forces are involved in solution formation? Explain why cations in aqueous solutions are attracted to the oxygens of water molecules and why anions a…

What tool will allow me to view javascript exceptions in Android native browser

What tool will allow me to view javascript exceptions in Android native browser pages on 4.2.2? I don't use Android day to day, but I am a software developer, and I do know that t…

What trend can you note for the relative reactivities of sodium and lithium and

What trend can you note for the relative reactivities of sodium and lithium and their respective position in the periodic table by looking at a periodic table and doing an experim…

What trend emerged from changing the polarity of the mobile phase in terms of th

What trend emerged from changing the polarity of the mobile phase in terms of the Rf of the pigments? What happened to the separation as you increased polarity of the mobile phase…

What trend in atomic radius do you see as you go down a group/family on the peri

What trend in atomic radius do you see as you go down a group/family on the periodic table? What causes this trend? What trend in atomic radius do you see as you go across a perio…

What tripeptides would be produced from the partial hydrolysis of Ser-Leu-Gly-Gl

What tripeptides would be produced from the partial hydrolysis of Ser-Leu-Gly-Gly-Ala? Enter the three-letter abbreviation of the tripeptides separated by commas. b) In an alpha h…

What tripeptides would be produced from the partial hydrolysis of Ser-Leu-Gly-Gl

What tripeptides would be produced from the partial hydrolysis of Ser-Leu-Gly-Gly-Ala? Enter the three-letter abbreviation of the tripeptides separated by commas. b) In an alpha h…

What two atomic orbitals or hybrid atomic orbitals overlap to form the carbon-ca

What two atomic orbitals or hybrid atomic orbitals overlap to form the carbon-carbon sigma bond in ethyne? sp^3-sp^3 p-p sp^2 - sp^2 s-s sp-sp Which is the correct order of decrea…

What two atomic orbitals. or hybrid atomic orbitals overlap to form the carbon-c

What two atomic orbitals. or hybrid atomic orbitals overlap to form the carbon-carbon alpha bond in ________ sp^2_sp^2 s-s sp-sp p-p sp^3-sp^3 How many distinct internal alkynes e…

What two concepts underpin Schrodinger’s equations for the energies of electrons

What two concepts underpin Schrodinger’s equations for the energies of electrons in an atom: Standing waves are quantized and of fixed energy Conservation of energy and wave-parti…

What two factors determine the vapor composition above a liquid mixture at any g

What two factors determine the vapor composition above a liquid mixture at any given temperature? Define the term "zoetrope". What is the minimum difference in boiling points need…