Chemistry Questions and Answers August 05, 2020

Which of the followingcharacteristics are true about a typical peptide (amide)bond? 1) The bond is planar. 2) There is free rotation about the carbonyl carbon and nitrogenbond. 3) There is substantial double-bond character to this bond. 4) There is a net negative charge on nitrogen and net positivecharge on oxygen. Only statements 1, 2, and 4 are

Which of the following molecules are polar: Cl 2 , CO 2 , BF 3 , NO, SO 2 ,XeF 4 Group of answer choices NO, SO 2 only Cl 2 , CO 2 only NO, XeF 4 only BF 3 , XeF 4 only

Which of the following processes are nonspontaneous orspontaneous? a) a bike going up a hill b) a meteor falling on Earth c) obtaining hydrogen gas from liquid water d) a ball rolling down a hill e) Are the nonspontaneous processes impossible?

Which the following correctly describes resonancestructures? A. Resonance stabilizes structure. B. The structures differ in the placement of atoms. C. Electrons are located between atoms. D. The most important structure will have the largest amount offormal charge.

Which of the following has the highest buffer capacity? a.0.50 M H 2 PO 4 - /0.50 M HPO 4 2- b. They all have the same buffer capacity. c. 0.10 M H 2 PO 4 - /0.50 M HPO 4 2 - d. 0.10 M H 2 PO 4 - / 0.10 M HPO 4 2- e. 0.50 M H 2 PO 4 - / 0.10 M HPO 4 2-

Which of the following species below will have the weakest sulfur-oxygen bond? (1)SO 2 (2)SO 3 (3)SO 3 2 (4)SO 4 2

Which of the following energy levels is not possible in the Bohrhydrogen atom? A. =-2.179 x J B. =-5.445 x J C. =-2.421 x J D. =-2.183 x J E. =-1.362 x J

H ow many moles of CH3CH2OH are contained in 548 mL of 0.0788 M CH3CH2OH solution? 5) _______ A) 1 .44 10-2 mol B) 4 .32 10-2 mol C) 6 .95 10-2 mol D) 5 .26 10-2 mol E) 2 .32 10-2 mol

Which of the following molecules contain a C3 axis and a ?hplane? (There might be more than one answer correct ) SbCl 3 AlBr 3 PCl 3 TeO 3 Which of the following species contain an inversion center?Choose all that apply. SeF 6 SiBr 4 InH 3 [IF 4 ] - Which of the following molecules contain a C3 axis but not a ?hplane? AlF 3 NBr 3 AsH 3 SO 3 Which

Which of the following ranks the pair of acids in the correctorder of strength? Which of the following ranks the pair of acidsin the correct order of strength? HBrO is weaker than HClO. HI is weaker than HBr. HClO is stronger than HClO3 . LiH is stronger than HF.

Which of the following statements regarding thin layerchromatography are TRUE? In thin layer chromatography, a polar organic compound will beattracted to the adsorbent and therefore travel further up theplate than a non-polar compound The Rf value is independent of the adsorbent material used. In thin layer chromatography, a polar organic compound

Whispering Winds Corp. accounting records show the following for the year ending on December 31, 2022. D Purchase Discounts Freightin Purchases Beginning Inventory Ending Inventory Purchase Returns and Allowances 11600 O 715420. O 690820. O 659620. O 705220. 16700 698020 59000 63600 12300 Using the periodic system, the cost of goods purchased is

Identify the exact numbers in this list. Select all thatapply 1- 2.54 cm (the number of centimeters in exactly 1 in) 2- 4 choices (the number of choices in this list) 3- 56.00 s (a time measured by a stopwatch) 4- 3 lbs (the weight of an object measured on a scale)

Which, if any, of the following processes is spontaneous under the specified conditions? a) H2O(l) H2O(s) at25C b) CO2(s) CO2(g) at 0C c) 2H2O(g) 2H2(g) + O2(g) d)C(graphite) C(diamond) at 25C and 1 atm pressure e) None of these is spontaneous.

Which of the following have the same number of valenceelectrons? A) Al, Ge, Sb B) P, As, Sb C) Cs, Bi, At D) Xe, Rn, At E) Fr, Ra, Lr

In which of the following equations is the ACID correctlyunderlined? A. HCO3- + H2O --> H2CO3 + OH- B. H2PO4- + H2O --> H3PO4 + OH- C. CN- + H2O --> HCN + OH- D. CH3COOH + H2O --> CH3COO- + H3O+

The lab technician Anna Lytic adds 2.20 mol KOH to 1.00 L of 0.5M Al(NO3)3. What is the concentration of aluminum ions after thealuminum nitrate has reacted with the potassium hydroxide? Kf = 3.0 1033 for Al(OH)4 The correct answer is 1.0x10^-31 but I am unsure of how to getthere.

Identify the true statements regarding disulfide bridges (disulfide bonds). Include all that apply. a. Disulfide bridges are important to primary and tertiary structure, not quaternary b. Disulfide bridges have a stabilizing effect on proteins c. A disulfide bridge forms between two cysteine residues. d. Disulfide bridges can exist between two

The half-life for the radioactive decay of U?238 is4.5 billion years and is independent of initial concentration. A) How long will it take for 10% of the U?238 atoms in a sample of U?238 to decay? Express your answer using two significant figures. B) If a sample of U?238 initially contained1.410 18 atoms when the universe was formed 13.8billion

Which of the following should have the largest Henry's lawconstant (kH) in water? A) Ar B) CO C) Xe D)CH3CH3 E) CO2

At 25 ?C the reaction from Part A has a composition as shown in the table below. Substance Pressure (atm) C2H2(g) 4.75 H2(g) 3.45 C2H6(g) 4.2510 ?2 What is the free energy change, ? G , in kilojoules for the reaction under these conditions?

Which of the following is NOT a function oflow-density-lipoproteins (LDLs)? A. make cholesterol available to tissue cells for hormonesynthesis B. transport cholesterol from the peripheral tissues to theliver C. make cholesterol available to tissue cells for membraneformation D. assist in the storage of cholesterol when supply exceedsdemand

Which of the following pairs of structures represent resonance forms, and which do not? Pair (a) represents resonance forms. Pair (b) represents resonance forms. Pair (c) represents resonance forms. Pairs (a) and (b) represent resonance forms. Pairs (a) and (c) represent resonance forms. There are no pairs representing resonanse forms. Could you

Part A. Enter the name of the Arrhenius acid that contains the fluoride anion. Enter the name of the acid. Spelling counts! acid Part B Enter the name of the Arrhenius acid that contains the ascorbate anion. Enter the name of the acid. Spelling counts! acid Part C Enter the name of the Arrhenius acid that contains the bromite anion. Enter the name

Which of the following statements about voltaic and electrolyticcells is correct? The cathode is labeled as positive (+) in a voltaic cell butnegative () in an electrolytic cell. The electrons in the external wire flow from cathode to anode inboth types of cell. Reduction occurs at the anode in an electrolytic cell. The free energy change, ?G, is

Which of the following is a nonelectrolyte? Please state why orwhy not for each. Thanks a) NaOH. b) HNO 3. c)C 2 H 6 O (ethanol). d) KF. e)CH 3 COOH (acetic acid)

Suppose the totalcost function for a firm is given by Cqw313 a. Use Shephards lemma to compute the (constant output) demand functions for inputs 1 and k. b. Use your results from part (a) to calculate the underlying production function for q.

Which of the following statements could be true regarding polar molecules? Choose one or more: A polar molecule will not contain polar bonds. A polar molecule may have one or more lone pairs. A polar molecule has an uneven distribution of electron density. The bond dipoles in a polar molecule will cancel. A polar molecule will never contain

Part A Determine the value of K p for thefollowing reaction: 4HCl(g)+O 2 (g)?2Cl 2 (g)+2H 2 O(g) Express the equilibrium constant to three significantdigits. Part B Determine the value of K p for the followingreaction: Cl 2 (g)+H 2 O(g)?2HCl(g)+1/2O 2 (g) Express the equilibrium constant to three significantdigits. Part C What is the value of K c

Which of the following statements applies to metalloenzymes? 1. Some metal ions assist in ATP binding 2. Amino acid residues in the enzyme are never covalentlylinked to the metal ion. 3. The metal does not bind at the catalytic site 4.Many are oxido-reductases.

For which of the following elements could the central atomexhibit sp 3 d 2 hybridization? C S N B

Order the following from shortest to longest bond: C 2 ,B 2 , H 2 , N 2 a) H 2 , N 2 , C 2 ,B 2 b) N 2 , C 2 , B 2 ,H 2 c) C 2 , N 2 , H 2 ,B 2 d) C 2 , B 2 , H 2 ,N 2 e) none of these The answer is A but i need help finding out why

Which of the following would occur if solid NH4Cl was added toan aqueous solution of NH3? The pH decreases. The equilibriumconstant changes. The pH increases. NH3 will ionize to a greaterextent.

If the lead can be extracted with 92.5% efficiency, whatmass of ore is required to make a lead sphere with a4.50 cm radius? Lead metal can be extracted from a mineral called galena, whichcontains 86.6% lead by mass. A particular ore contains68.5%galena by mass. Express your answer with the appropriate units.

Which of the following sets of elements have the [noblegas]ns2np2 valence electron configuration? C, Si, Ge, Sn, Pb F, Cl, Br, I, At N, P, As, Sb, Bi O, S, Se, Te, Po Ti, Zr, Hf

a) Which of the following reagents would oxidize Fe to Fe2 , butnot Sn to Sn2 ? is it Co, Br-, Ca2+, Ca, Br2, Co2+?? b) Which of the following reagents would oxidize Ag to Ag , butnot Cl to Cl2? is it Ca, Br2, Co, Co2+, Ca2+. or Br-?? Please help me out...I cannot figure it out. I tried to look atthe standard reduction table but it does not make

Which of the following can act as a Lewis base? Cr3+, SO3, CH3NH2, BeCl2 A.Cr3+, BeCl2 B.SO3 only C.CH3NH2, BeCl2 D.SO3, CH3NH2 E.CH3NH2 only

Which of the following can result in deviations from Beer's lawwhen the path length is constant? Solute concentrations less than0.01 M Stray light reaching the detector The absorbing species undergoes dissociation or association The sample is homogeneous The use of polychromatic radiation

Find the of each of the following solutions of mixtures of acids. And explain. 1. 1.510-2 M in HBr and 1.510-2 M in HClO4 2. 8.510-2 M in HF and 0.230 M in HC6H5O 3. 0.100 M in formic acid and 4.510-2 M in hypochlorous acid

The half- life of a positron is very short. it reacts with an electron, and the masses of both are converted to two gamma-ray photons: (0e+1)+ (0e-1)---> 2? (the 0 in front of e is the mass # and behind it is the atomic #) (? stands for the photons) This reaction is called an annihilation reaction. the mass of an electrion or positron is 9.109 *

The following dipeptide is AspTyr. Indicate the charge state for each structure at the given pH by adding the or charges to the appropriate functional groups and adding or removing hydrogen atoms to the structure where appropriate. pH 1 pH 7 pH 14 H 0 NCHINH CHILon H CH A H 0 NCHINHCHIL H1 CH 0 0 A OH NCHILNHCHII CH 0

Draw the most stable Lewis structure of acrolein and the most stable Lewis Structure of methyl mercaptan.

e See page 154 15 Question (1 point) Acrolein, a chemical produced when barbecuing meat, has the chemical formula C3H4O. Methyl mercaptan, a component of human bad breath, has the chemical formula CH4S. Spacefilled models of both compounds are shown below. Acrolein, present in smoky barbeque Methyl mercaptan, present in human bad breath

How many grams of KCl remain in solution at20 C ? How many grams of solid KCl came out of solution aftercooling? A solution containing 84.9 g KCl in210 g H2O at 50 C is cooled to20 C . Use the solubility data from the table below. Solubility (g/100gH2O) Substance 20?C 50?C KCl 34.0 42.6 NaNO3 88.0 114.0 C12H22O11 (sugar) 203.9 260.4

Four resonance structures of the following cation are possible.Two resonance forms are given below, but they are incomplete.Complete the given structures by adding nonbonding electrons andformal charges. Draw the two remaining resonance structures (in anyorder), including nonbonding electrons and formal charges. alsowhich structure is the most

C www.saplinglearning.comibiscmsmodibisview.phpid326470 tatistics Print ore 69100 Question 22 of 24 10 0x 11 90 12 958 13 100k 14 1006 15 1000 16 99 17 0 18 OK 19 90 20 100 21 22 ON Calculator HC Periodic Table sapling learning Four resonance structures of the following cation are possible. Two resonance forms are given below, but they are

Arrange the following elements in order of increasing atomic size (low to high) based on periodic trends, Give no.1 to small atomic size, and give no.4 to big atomic size. Which of the following is the best answer CI, Mg, S,Sr PERIODIC TABLE OF THE ELEMENTS 11 30 320Det Fr 2 4 Be VORE 32 Mg PUS 20 23 G 54 TI 45 39 38 St 95 Ba ANTA R A 22 102 7

Give the formula for each coordination compound. Include square brackets around the coordination complex. Do not include the oxidation state on the metal. Use parentheses only around polyatomic ligands. For ethylenediamine use (en) in the formula. a. sodium tetrachloroplantinate(II) b. dibromobis(ethylenediamine)cobalt(III) bromide c.

Glucose generally exists in ring (cyclic) form. A Haworth projection shows the orientations of the hydroxyl groups and hydrogen atoms on the ring. Draw the x and 3 forms of glucose by moving the groups (H, OH, or CHOH) to the appropriate positions. H OH CHOH H OH aDglucose Y I. H OH BDglucose

For each of the given situations, indicate whether S or O2 is the limiting reactant. a) 3 mol Sulfur, 4 mol Oxygen b) 3 mol Sulfur, 5 mol Oxygen c) 3 mol Sulfur, 3 mol Oxygen

The Ksp of PbBr2 is 6.60*10^-6 What is the molar solubility(M) of PbBr2 in pure water? What is the molar solubility(M) of PbBr2 in 0.500M KBr solution? What is the molar solubility(M) of PbBr2 in a 0.500M Pb(NO3)2 solution?

A hydrogen-filled balloon was ignited and 2.30 g ofhydrogen reacted with 18.4 g of oxygen. How many grams of water vapor were formed? (Assume that watervapor is the only product.)

a) If K b for NX3 is6.510 ?6 , what is the pOH ofa 0.175 M aqueous solutionof NX3? b) If K b for NX3 is6.510 ?6 , what isthe percent ionization of a 0.325 M aqueous solutionof NX3? c) If K b for NX3 is6.510 ?6 ,what is the the p K a forthe following reaction? HNX3+(aq)+H2O(l)?NX3(aq)+H3O+(aq)

Which of the following pairs of aqueous solutions will form aprecipitate when mixed? Which of the following pairs of aqueoussolutions will form a precipitate when mixed? Li2S + HI MgCl2 + KOHK2CO3 + HNO3 HF+ LiOH All of these solution pairs will produce aprecipitate.

Which of the following describes the bonding in HNNH? A) sp orbitals on each nitrogen overlap and form a sigmabond B) sp orbitals on each nitrogen overlap and form a pi bond C) sp2 orbitals on each nitrogen overlap and form a sigmabond D) sp2 orbitals on each nitrogen overlap and form a pi bond E) p orbitals on each nitrogen overlap and form a

The enthalpy of FeBr3 (s) is -269 kj/mol and the enthalpy of the reaction 2Fe(s) +3Br2(g) ->2FeBr3 (s) is -631 kj/mol. Calculate the enthalpy of evaporation of Br2 (l) which is liquid at 25C.

Which of the following could be added to a solution of aceticacid to prepare a buffer? nitric acid only sodium acetate only sodium hydroxide only hydrofluoric acid or nitric acid sodium acetate or sodium hydroxide

Which of the following statements regarding alpha particles aretrue? Check all that apply. a. Alpha particles have a mass number of 4 b. alpha particles have a nulear charge of +1 c.Alpha particle formation is accompanied by the conversion of aproton into a neutron d. Alpha particle formation is accompanied by the conversion ofa neutron into a

Which of the following statements correctly describes a spontaneous process? A) All spontaneous processes proceed without outside intervention. B) All spontaneous processes are fast. C) The reverse process of a spontaneous process is always spontaneous. D) All spontaneous processes are exothermic.

Which of the following statements summarizing valence bondtheory is correct? The geometry of the molecule is determined by the geometryof the orbitals used. The orbitals used in bond formation are atomic orbitals (s, p,d, and f). A chemical bond forms only when occupied orbitals areinvolved. A bond is formed by the overlap of two hybrid orbitals

The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 =7.5. Calculate the pH at each of the following points in thetitration of 50.0 mL of a 0.95 M B(aq) with 0.95 MHCl(aq). (a) before addition of any HCl (b) after addition of 25.0 mL of HCl(c) after addition of 50.0 mL of HCl (d) after addition of 75.0 mLof HCl (e) after addition of 100.0

Which of the followingsolutions will have the lowest freezing point? a. 0.010 m Li 2 SO 4 b. 0.015 m MgCl 2 c. 0.035 m CH 3 CH 2 CH 2 OH d. 0.010 m NaCl

Which of the following statements are true in pure water at any temperature Answer a. [H3O+] = [OH-] b. [H3O+][OH-] = 1.0 x 10-14 c. [H+] can be zero in a very basic solution d. pH = 7.0 e. The value of Kw depends on temperature

sapling learning The image below shows a lipid bilayer, with the polar heads represented by circles and the hydrophobic tails represented by lines. Drag the fatty acids into the lipid bilayer to indicate a structure that, when incorporated into a phosopholipid, would result in a more fluid membrane with a lower melting point. Be sure to insert the

In the kinetic analysis of this experiment for the reaction ofiodide ion with hydrogen peroxide, state the purpose for each ofthe following solutions ( see Table 24.1): a. deionized water b. buffer solution (acetic acid, sodium acetate mixture) c. starch solution d. sodium thiosulfate solution

ITEM 6 Under which circumstancesare K p and K c equalfor thereaction a A(g)+ b B(g)? c C(g)+ d D(g)? If the reaction isreversible.If a + b = c + d .Ifthe equilibrium constant is small.

Which of the following is a precipitation reaction? a. 2 LiI(aq) +Hg 2 (NO 3 ) 2 (aq) ?Hg 2 I 2 (s) + 2 LiNO 3 (aq) b. NaCl(aq) + LiI(aq)? NaI(aq) + LiCl(aq) c. HCl(aq) + KOH(aq)? KCl(aq) + H 2 O(l) d. Zn(s) + 2AgNO 3 (aq) ? 2 Ag(s) +Zn(NO 3 ) 2 (aq) e. None of the above areprecipitation reactions.

Which ionization process requires the most energy? a. S(g) S + (g) + e - b. S + (g) S 2+ (g) + e - c. Cl(g) Cl + (g) + e - d. Cl + (g) Cl 2+ (g) + e - Explain

Identify the geometry of each of the following molecules. There is one example of each of the geometries from our list. OF 2 SeF 4 IF 3 XeF 4 CCl 4 IBr 2 SeF 6 PH 3 BH 3 AsCl 5 RnF 5 +

For which of the following aqueous salts will electrolysis produce hydrogen gas and oxygen gas? Check all that apply A) NiF 2 B) CuBr C) NaI D) NaF E) NiI2

Identify the oxidation numbers for all the elements in thereactants and products for 2MnO4?(aq)+3S2?(aq)+4H2O(l)?3S(s)+2MnO2(s)+8OH?(aq)2MnO4?(aq)+3S2?(aq)+4H2O(l)?3S(s)+2MnO2(s)+8OH?(aq) State the total number of electrons transferred in the reactionshown in Part A. Part B Identify the oxidation numbers for all the elements in thereactants and

Which of the following reactions is associated with the lattice energy of Li2O (Hlatt)? A. Li2O(s)---->2 Li+(g) + O2-(g) B. 2 Li+(aq) + O2-(aq)---->Li2O(s) C. 2 Li+(g) + O2-(g)----->Li2O(s) D. Li2O(s)---->2 Li+(aq) + O2-(aq) E. 2Li(s) + 1/2 O2(g)---->Li2O(s)

Which of the following statements about hydrogen bonds isFALSE? 1. they can only form between two different molecules 2. the donor is a hydrogen atom bonded to a moreelectronegative atom 3. the more linear the bond, the stronger theattraction 4. the acceptor must contain a non-bonded pair ofelectrons 5. it is a type of non-covalent bond

Given the solubility of lead (II) chloride PbCl2 is 1.6x10^-2 M. What is the Ksp of PbCl2? The answer is 1.6x10^-5

Which of the following tripeptides would be most likely to be soluble in an organic (hydrophobic) solvent like benzene? Post your reasoning or I will not rate positively. I believe it is N - proline - phenylalanine - leucine - C . because they are all hydrophobic amino acids, and like dissolves like.... if this is not correct could you tell me

Which of the following reactions would occur to a measurableextent in water? Br - (aq) + H 2 O (l) ---> HBr (aq) +OH - (aq) NH 4 + (aq) + H 2 O (l) --->NH 3 (aq) + H 3 O + (aq) Cl - (aq) + H 2 O (l) ---> HCl (aq) +OH - (aq) F - (aq) + H 2 O (l) ---> HF (aq)+ OH - (aq)

Which of the following trends in lattice energy is due to differences in ionic radii? MgO> NaCl CaO> CaBr2 NaCl> RbBr> CsBr All of the above

Which of the following statements is correct pertaining to theisomers of curcumin, the bright yellow plant extract that MarcoPolo wrote about in 1280 AD? a. one of the tautomers (the ketone) is lethal if ingested b. one of the tautomers ) the nol) has anti-oxidantproperties c. neither one of the tautomers have anti-oxidant properties d. both the

Draw the products of the reaction shown. Electron flow is indicated with curved arrows. HA HC Br CH3 OCH 3 Include all valence lone pairs in your answer. Include counterions, e.g., Na, I, in your submission, but draw them in their own separate sketcher. Draw one structure per sketcher. Add additional sketchers using the dropdown menu in the

Predict the organic products of the following reaction. Thechlorine is in excess. Complete the mechanism for the reaction withthe missing atoms, bonds, nonbonding electrons and curved arrows.Note the resonance arrows after the second panel. Follow thedirections where directed.

Predict the organic products of the following reaction. The chlorine is in excess. ox H H H OH Complete the mechanism for the reaction with the missing atoms, bonds, nonbonding electrons and curved arrows. Note the resonance arrows after the second panel. Follow the directions where directed. H CI H Map 8H H 000

Use the table below to answer the following questions. of Workers Total Product per day 0 1 2 3 4 5 6 0 4 18 22 22 Marginal Product 6 2 Average Product a) Fill in the table above. b) At what point (number of workers) does the firm experience diminishing returns Explain.

Interstellar space has an average temperature of about 10 K and an average density of hydrogen atoms of about one hydrogen atom per cubic meter. Calculate the mean free path of hydrogen atoms in interstellar space. Use d = 100 pm as the diameter of a hydrogen atom.

Strontium hydroxide is used in the refining of beet sugar. Only 4.1 g of strontium hydroxide can be dissolved in 1 L of water at 273 K. Given that its solubility is so low, explain how it is possible that strontium hydroxide is considered a strong base.

If He gas has an average kinetic energy of 4310 J/mol under certain conditions, what is the root mean square speed of O2 gas molecules under the same conditions? (given that He and O_2 gas are at the same temperature what can you conclude about 0_2's average kinetic energy?)variable equations used to find the solution are greatly appreciated!!!

In each reaction box (3 boxes total), place the best reagent or reactant from the list below. 1) Reagent A 2) Reactant A 3) Neutralization. C9H12O2 OH Reagent B NaH PCC PBr3 ethyl acetate acetone NaBH4 ethylene oxide Mg in Et0

IR Spectrum of Benzophenone and Triphenylmethanol Benzophenone: C-H stretch (aromatics) at around 3000-3100? C=O strecth (ketone) at around 1700? Any others that I missed that are important for me to label? Triphenylmethanol: O-H stretch at around 3400-3500? C-H strecth (aromatics) at around 3000-3100? Any others that I missed that are important

Benzophenone starting material Relative Transmittance 1 0.8 0.6 0.4 0.2 Stretch Gromatics INFRARED SPECTRUM 3000 stretch ketone 2000 Wavenumber (cm1) Benzophenone 1000

Give the outer electron configuration for each of the following columns in the periodic table. 1) 3A Express your answer as a string without blank space between orbitals. For example, the outer electron configuration for the column 5A, ns^2np^3, should be entered as ns^2np^3 2) 4A Express your answer as a string without blank space between

A mass of 0.630 g of NaCl is dissolved in525 g of water. A. Calculate the molality of the salt solution. B. Calculate the mole fraction of salt in thissolution. C. Calculate the concentration of the salt solution inpercent by mass. D. Calculate the concentration of the salt solution inparts per million

Which of the following events may occur when IR radiation isabsorbed? (true or false) -Intra-molecular bond angles are changed. -Vibrational amplitudes of bonds are increased. -Relative electron spins are changed. -Bonding electrons are promoted to higher energy molecularorbitals. -More intense IR absorptions occur for those bonds having

Which part of the coffee cup calorimeter system could have moreheat leaks? Where the stirrer join the coffee cup Where the thermometer join the liquid The bottom of the cup Between the cardboard lid and coffee cup ALL OF THE ATEMPTED ANSWERS WERE INCORRECT.... The answer isD.

How many moles of atoms are in 9.00 g of 13C?Answer is 0.692 mol 13C Based on your answer in Part A,calculate the number of atoms in this amountof 13C? Express your answer numerically in atomsof carbon. How many electrons? How many neutrons?

Part B By what factor will the rate of the reaction change ifthe pH decreases from 6.50 to 2.00? Express your answer numerically using two significantfigures. Part C The reaction is pH dependent even thoughthe H+ ion does not appear in the overall reaction. Whichof the following explains this observation? Check all that apply. View Available

Explain what is meant by a sigmatropic rearrangement, using a 3,3 rearrangement as your example. The product S from the reaction below results from two 3,3 sigmatropic rearrangements. Give the mechanism of the reaction. Me. R Me Me Me S

What is AHrxn for the following chemical reaction CO(g)NH3(g)HCN(g)H2O(g) You can use the following table of standard heats of formation (AHof) to calculate the enthalpy of the given reaction. Express the standard enthalpy of reaction to three significant figures and include the appropriate units. ElementCompound Standard Heat of Formation (kJmol)

For each molecule below, specify the polarity of the bonds and the overall polarity of the molecule. You must state the polarity of the molecules as well as the bonds. BeCl2 H2O O3

Complete the balanced overall ionic equation for sodium iodide dissolving in water. (wa). Nal (s) Na 1 (aq) Part 2 (1.3 points) Feedback Complete and balance the overall ionic equation for lead(II) nitrate dissolving in water. Pb(NO)(c) Pb 2 (aq)2NO3(aq),Complete the balanced overall ionic equation for the mixing of these two solutions. x He

Which of the following is true of an isosbestic point? A. The phenomenon occurs most commonly when two species areconverted into one species. B. It is a point on an absorption spectra where two specieshave the same molar absorptivity. C. An example of an isosbestic point is when a reactant andits product, regardless of total concentration, both

Which of the following statements about isozymes are true?Select all that apply Lactate dehydrogenase is an example Isozymes catalyze different reactions Isozymes are present at various developmental stages Isozymes have identical regulatory properties Isozymes are encoded by the same gene Isozymes have different amino acid sequences

5. When we eat food, the polysaccharides, lipids, and proteins are digested to smaller molecules such as the glucose, fatty acids, and amino acids. As they are broken down further, energy is released. Because we do not use all the energy from our foods at one time, we store energy in the cells as highenergy adenosine triphosphate (ATP). (17

A gas mixture contains HBr, NO2, and C2H6 at STP. If a tiny hole is made in the container, which gas will effusefastest? Which gas molecules have the highest average kinetic energy atthis temperature?

List the following compounds in order of increasingconcentration for their saturated solutions. (From lowest tohighest concentration of saturated solution). 1.gold(III)chloride 2. nickel (II) chloride 3. potassium dichromate 4. copper (II) sulfate

Part A Calculate the enthalpy of the reaction 2NO(g) O2(g)2NO2(g) given the following reactions and enthalpies of formation 12N2(g)O2(g) NO2(g), AHA33.2 kJ 12N2(g)1202(g) NO(g), AHB90.2 kJ Express your answer with the appropriate units.,Calculate the enthalpy of the reaction 4B(s)302(g) 2B2O3(s) given the following pertinent information