Chemistry Questions and Answers August 12, 2020

15. The correct order of acidity for the following compounds is (a) B CA (B) (b) CBA (C) ii (c) BA C (c) CAB

Identify the reagents needed to carry out each transformation, and identify the name of the reaction for each box.

PBr3 1 LiAIH4 2 H2O H2O, HO H Lindar catalyst KMnO4 . . Reset mCPBA HCO3H H2O, HO Brz Na NH3 PCC pod C OH OH OH Br

Predict the bond order of Be2 and Be. Do you expect these molecules to exist in the gas phase Match the items in the left column to the appropriate blanks in the sentences on the right. Su 1 0 Both Be and Be are 12 is negative is positive 1 Be is Be is 2 Request Answer The bond order of Be is The bond order of Be is able to exist in the gas phase

A monoprotic acid, HA, is dissolved in water HAHO H0 A The equilibrium concentrations of the reactants and products are HA 0.230 M H3O 2.00 104 M A 2.00 x 104 M Calculate the Ka value for the acid HA. K Number

The graphs below labeled (a) and (b) show the titration curves for two equal-volume samples of monoprotic acids, one weak and one strong. Both titrations were carried out with the same concentration of strong base. What is the approximate pH at the equivalence point of (a) curve? (Figure 1) Express your answer as a whole numbe c Part B What is the

Hd (b) 14 12 10 8 4 2 0 0 20 40 60 80 100 Volume of base added (mL)

1. Arrange the given carbon acids in the increasing order of acidic strength D (A) (B) Me Me (a) A

Match the term with its definition. Match the description with its meaning. Compound that is electron pair acceptor is called A substance that can accept a proton is called Compound that is electron pair donor is called The smaller the value of the pka, A substance that can lose a proton is called The larger the value of the pKa, Choose...

Give the systematic IUPAC name for the following. CH3 2methylbicyclo 2.2.1,Draw all possible structure(s) and give the IUPAC systematic name(s) of an alkane or cycloalkane with the formula CHs that has only primary hydrogen atoms. X Incorrect. Draw the structure(s). CH Xi CH X HC HC CH V,Select the IUPAC systematic name(s) (all drawn in previous

Part A Which of the following statements is correct concerning the gas phase The volume of a gas is always less than the volume of its container. Depending on their chemical nature, two or more gases can form either a homogeneous or heterogeneous mixture. A gas expands spontaneously to fill its container. When pressure is applied to a gas, its

Part A Match each function with the name of a major enzyme class. 1) transfer functional groups between molecules A) oxidoreductases 2) catalyze intramolecular rearrangements B) transferases 3) catalyze redox chemistry C) hydrolases 4) catalyze the joining of two molecules together D) lyases E) isomerases F) ligases 1B 2C 3D 4F 1B 2F 3C 4D 1B 2E

2. For which of the following reactions. Equilibrium constant (k) is less than unity (a) (CD3)CH (CH3)3C (CD3)3C (CH3)3CH 0 (b) NH CH4 (c) CH3CECHNH CH3CEC NH3 e (d) NH NH3

Give the name of the peptide. Spell out the full name of the peptide.

Hydrocarbon groups of selected amino acids The structures of the R groups of selected amino acids are shown in the following table Part A Give the name for the peptide Spell out the full name of the peptide Hints seyhredvase Submit My Answ Incorrect Try Again 4 attempts remaining eg WI Amino acid Abbreviation Glu glutamic acid isoleucine leucine

Identify whether each of the following reactions occurs through an SN1, SN2, E1, or E2 mechanism.

(a) (b) (c) entify whether each of the following reactions occurs through an SN1, SN2, E1, or E2 mechanism. Br Br OH (CH3)3CONa (CH3)3COH CH3ONa THF H3O CH3OH Na Br CH3 Na Br CH3 HO 0 000 SN1 SN2 E1 E2 SN1 SN2 E1 E2 SN1 SN2 E1 E2

Identify the Lewis acid and Lewis base in each of the following reactions. Lewis acid CI AICI, AICI BF, F BF NH, H DC NH Lewis base

3. Which of the following nitrogen compound shown below is the strongest acid O (a) NH (b) 11 NH CNH, (c) CNH I CNH O of (d)

In the following compounds OH 5 5 5 () (IV) NO2 NO (II) CH3,The order of acidity is (a) III IVI II (b) IIV III II (c) II I III IV (d) IV IIII II

5. Among the following the most basic compound is (a) CHNH (b) pNOC6HNH (c) mNOC6HNH (d) CHCHNH

6. Which of the following has lowest Pka value (a) (c) H (b) (d) H H

7. Arrange the following in increasing order of their acidic strength (1) (a) II

8. Which of the following is the strongest base is water (a) N (b) HIN (d)

9. Which of the following incorrectly represents the acidic strength of given acids (a) ClCHFCH (b) CHCOOH CHCHOH (c) HO CHOH OH OH . NO (d) A

10. Which of the following is most basic in aqueous solution NH HN NH (b) CH3 CH3NH (c) CH3 CH3NCH3 (d) CH3 NH NH

11. The correct order of decreasing basic strength of X, Y and Z is (X) NH (a) XYZ (Y) NH (b) XZY C (c) YXZ (d) YZX

12. Consider the hydrogen atoms. Attached to three different carbon atoms (labeled 1 2 and 3). Rank the attached hydrogen atoms in order from most acidic to least acidic. (a) 213 (b) 123 3 (c) 231 (d) 321

13. Which of the following compounds would your expect to be strong carbon acid (a) (b) (c) CH,(CO,Et)2 (d) CH,COCH,COOC,H,

14. Arrange the following compounds in the increasing order of acidic strength (i) Benzoic acid (ii) pmethoxy benzoic acid (iii) Omethoxy benzoic acid (a) i ii iii (b) iii

15. H Ha N He H He Identify the most acidic hydrogen present in the above compound (a) a (b) b (c) c XXXXX (d) d

1. Which of the following least acidic (a) COOH CD 3 (b) COOH CH3 (c) COOH CD (d) COOH CH3

2. Indicate the correct order of acidity (first ionisation) in the following dicarboxylic acids COOH HOOC COOH HOOC COOH HOOCCOOH HOOC (III) (1) (II) (IV) (a) IIIIII IV (b) IIIVIIII (c) IIIIIV II (d) IVIIIIII

3. Which is more basic NH OMe CH 1 CNH (A) H NH (a) A (c) Both are equally basic c0 NH I CNH (B) (b) B (d) Cant comment

4. Write the correct order of Ka of marked position CH bond in following compound H H P R H H H SH H H (a) RPJS (b) JPRS (c) RJPS (d) PRSJ

5. Write the correct basicity order of the following compounds H H NH (II) (III) (IV) (I) C (a) IIIIIV II H (b) IIIIIIIV (c) IIVIIII(d) IIIIIVI

6. Select the strongest acid in the following (a) ii (b) MeO OMe (d)

7. Which of the following has the most acidic hydrogen (a) 3hexanone (b) 2 4hexanedione (c) 2 5hexanedione (d) 2 3hexanedione

8. The correct order of acidity among the following compound is H Me (1) (a) IIIIII H (II) H NIH (III) (b) IIIIII (c) IIIIII (d) II IIII

9. Predict the correct acidity order among the following EtO OEt (II) OMe (III),(a) IIIIII (b) IIIIII (c) III III (d) III I II

10. Predict the correct acidity order among the following structure colle collow t EtO Me MeO OMe (I) (II) (III) (a) III I II (b) IIIIII (c) III III (d) II IIII

11. Predict which is more acidic among the following (1) JOH OH (a) III III (II) OH (III) (b) IIIIII OH (c) II I III (d) IIIIII

12. Correct of acidic strength of the following compound is Y H H (1) (III) CH3O CH3 (a) IIVII III (b) IVIII III (II) H3C (IV) O H3C (c) IIIIV III CH CH3 (d) IV IIIIII

13. weakest base among the following is NON (1) (a) I H (II) HN (b) II NH (II) (c) III NH C N (IV) (d) IV

14. Correct order of basicity is (I) NH (a) IIIIIIIV (II) NH Me (III) NH Me (IV) NH, Me (b) IIIIII IV (c) IIIIII IV (d) IIIIIIVI

15. Which of the following is the correct order of basic strength Og (P) (a) QRP Oo (b) RQ P (R) (c) RPQ (c) QPR

1. Select the strongest acid in the following (a) CHOH (b) o MeC HOH (c) mMeC HOH (d) p MeC HOH

Draw the correct structure name for acetophenone (1-phenylethanone)

ic Chemistry Draw the correct structure for acetophenone (1phenylethanone). Hint Tools C COOH TH H presented by Sapling Leaming Grading Include hydrogen atoms on noncarbon atoms Chirality is not graded. Previous 22 Give Up Sew Boluta about us

Question 2 1 pts If one mole of Na3PO4 3H2O is heated extensively, how many moles of water would be released (format answer as integer without units, eg 1),Question 3 Match the following chemical names with their respective formulas. (hint see lecture text) CuSO4 5 HO CuSO4 6 HO CuSO4 4 HO CuSO4 3 HO CuSO4 HO Copper (II) Sulfate Pentahydrate

Question 19 Identify the major and minor product(s) of the following reaction Br If there is more than one minor product, be sure to draw all of them. Incorrect. Major product(s) HC CH Incorrect. Minor product(s) HC CH3 CH CH Edit Edit NaOEt Get help Get help,Question 24 Identify the major and minor product(s) of the following reaction CI If

1. 2. 3. 4. 5.

QUESTION 1 A kineticallycontrolled process describes a reaction that generates the product favored at high temperatures generates the product requiring the fewest steps generates the most stable product generates the product formed at the slowest rate generates the product whose formation requires the smallest energy of activation

Which of these ions have five d electrons in the outermost d subshell?

Which of these ions have five d electrons in the outermost d subshell Zn Tc Ru Fe Re Mn y2 presented by Sapling Learning Which of these ions have ten d electrons in the outermost d subshell Zn Lr2 Sc y2 Tc2 Cd Fe

Identify the limiting reactant and determine the theoreticalyield of methanol in grams.

Carbon monoxide gas reacts with hydrogen gas to form methanol. CO(g) 2H(g)CH3OH(9) A 1.95 L reaction vessel, initially at 305 K, contains carbon monoxide gas at a partial pressure of 232 mmHg and hydrogen gas at a partial pressure of 384 mmHg.

Label all bonds in SO2. Label all bonds in NF3. Label all bonds in BF3.

Label all bonds in CH Br2. Label the diagram by dragging the labels to the appropriate targets. Note that not all labels will be used. a C(sp) H(s) C(sp) Br(s) T C(p) H(p) TT C(p) Br(p) T C(sp) H(p) C(sp) H(p) C(sp) Br(p) T C(sp) Br(p) Br H H Br reset help

Identify from the following compounds which one is aromatic. I O II OIV OI O III OV IV V,Identify from the following compounds which one is nonaromatic. OV OI O II OIV IV,Identify from the following compounds which one is antiaromatic. O IV OI O II OV CH B. I H II H E III IV H

Identify the definition of each of the following terms. Hint 00000 are triglycerides that are liquid at room temperature. are fats, oils, and other fatsoluble molecules. contain a carboxylic acid group and a hydrocarbon chain. are molecules that have three ester functional groups. are triglycerides that are solid at room temperature. 4 Previous

Predict the organic products, in any order, when the following alkene is subjected to ozonolysis with reductive work-up.

Products H H

The K, for hydrofluoric acid is 7.2 x 104. This means that HF is Save Question 2 (2 points) The stronger the acid, the stronger weaker a weak acid. neutral in water solution. a strong acid. lonic. able to react with HCL. Save 0 0 0 Question 3 (2 points) What is the pH of a solution with OH1 x 10 M Sodium carbonate gives a basic solution in water.

I don't know which one I got wrong

(a) Given the following reactions and their heats of combustion, calculate the heat of combustion per CH for cyclohexane, cycloheptane, cyclooctane and cyclononane. Compound cyclohexane cycloheptane cyclooctane cyclononane Combustion reaction CH, 90, ) 6CO, 6H,O 21 CH4 0, CH 120, C,H,, 0, 7CO 7CO 7HO SCO, SHO 9CO, 9H0 (b) Which is the most

How to create a Cation from this. the info provided is that i have 2 nuetrons and 1 proton and 1 electron. how should i adjust this to create a 'Cation?'

n on arge. never. DAY 1 0807 PROGRESS 24 Create a cation. Click the red button once you are finished. 2 3 Neutron 11 12 No Mg Atom 20 21 22 Ca So TI 41 Zr Nb Mo To 72 73 74 75 To W 104 105 106 06 O

What does a negative value of q tell us about the temperature change of a sample of water And is this process endothermic or exothermic Heat is being released by the water so the temperature of the water is decreasing. The process is endothermic. Heat is being absorbed by the water so the temperature of the water is increasing. The process is

Indicate whether the following can exist as a pure enantiomer ornot.

Indicate whether the following can exist as a pure enantiomer or not. Yes, it can exist as a pure enantiomer. No, it interconverts with its enantiomer. This is not optically active, there is no stereocenter.

Hi! I'm looking for help with the following question... could someone help explain the right answer to me? Thanks in advance!

Question 20 Predict the ideal bond angles in AsF3 using the molecular shape given by the VSEPR theory. 120 120 90 180 109.5 120 109.5 109.5 0.5 pts

e here to search Given the following thermodynamic values, calculate AS for this reaction. 2SO(g) O(g) 25O (g) AS S0 AS 0 ASOS 205.0 Jmol K SO 248.2 Jmol K AS 256.8 Jmol.K 1st attempt JK 9 OF 12 QUESTIONS COMPLETED M e 0612 See Periodic Table See Hint SUBMIT ANSWER

Find the oxidizing agent and reducing agent .Mg(s)+Br2I - MgBr2(s)

Label each carbon atom with its optimum CCC bond angle. 180 degrees 109 5 degrees 120 degrees 90 degrees 180 degrees 180 degrees 90 degrees 1 90 degrees 120 degrees CH 120 degrees CH CH CH CH CH CHo CH CH 90 degrees 120 degrees 120 degrees

OA LDF, dipoledipole interactions and hydrogen bonds What intermolecular forces are present in a solution of SeO3 OB. There are only LDF and dipoledipole interactions Oc. There are only dipoledipole interactions D. There are only LDF

Label each of the following steps for determining a molecular shape. Molecular formula Count all e groups around central atom (A). Step 1 Lewis structure Place lowest EN atom in center, total valence e, place single bonds first, distribute 8 e to all atoms, add multiple bonds as needed. Step 2 Electron group arrangement Count bonding and

Lead thiocyanate, Pb(SCN)2, has a Ksp value of 2.00 x 105,7 Part A Calculate the molar solubility of lead thiocyanate in pure water. The molar solubility is the maximum amount of lead thiocyanate the solution can hold. Express your answer with the appropriate units. View Available Hint(s) Value Submit Units ,Part B Calculate the molar solubility

Label each proton with the predicted splitting pattern it would exhibit in a 1H NMR spectrum. Either a Singlet, Doublet, Triplet, Quartet, or Multiplet. They can be used once, more than once, or none.

CI H H clH H H H

For the orbital box diagram below, enter the value of M and Ms. Enter Ms values as decimals (i.e., 0.5 instead of 12). S d 1 0 1 0 ML Ms Submit Answer Tries 02 2 1 0 1 2 NNCIT 0 1 2 1 0 1 0 ML Ms Submit Answer Tries 02 1 S d 0 ML Ms Submit Answer Tries 02 d 1 0 1 2 1 0 1 2 2

Which one of the following compounds gives 5-methyl-3-heptanolwith LiAlH4 followed by water?

11. Which one of the following compounds gives 5methyl3heptanol with LiAlH4 followed by water A) I III IV H II B) II V C)III H D) IV E) V

What is the mass of a sample of water containing 3.55? molecules of H2O?

1022

Label the energy diagram with the following terms ( catalyzed reactions, uncatalyzed reaction, activation energy, products, free energy, free energy, transition state, reactants, heat(G) of total reaction, reaction time).

G J A F E B C D

b) Which of the following are true statements about myosin Select all the true statements. The interaction between myosin and actin converts chemical energy to mechanical work. The myosinactin reaction cycle is powered by ATP hydrolysis. During muscle contraction, thick and thin filaments slide past each other causing an overall lengthening of the

What kind of intermolecular attractive force is shown in each of the following cases Part A Picture (a) londipole forces London dispersion forces Hydrogen bonding Dipoledipole forces Submit Previous Answers Request Answer X Incorrect Try Again 5 attempts remaining Part B Picture (b) Olondipole forces Hydrogen bonding O London dispersion forces

For neutral molecules, which statements about covalent Lewis structures are true Drag each item to the appropriate bin. Hydrogen atoms are often the central atom of a Lewis structure. For a neutral molecule, the number of electrons in the Lewis structure is the sum of the valence electrons for the atoms. True Each atom of a Lewis structure must

Identify the number of core and valence electrons for the following atoms. Xe Ra Number 0 core electrons Number Number core electrons core electrons Number Number Number valence electrons valence electrons valence electrons

Label each transition in this flowchart

Label each transition in this flowchart as a chemical change or a physical change. 8 chemical physical 00

Which of the following statements is false regarding ammonia Select one a. Aqueous ammonia will act as a base when reacting with HCI (aq). b. Ammonia can be found in many house cleaning products. c. Ammonia is a weak base. d. Ammonia is a weak electrolyte when dissolved in water. e. Ammonia is a strong base.

Through what mechanism do the light reactions regulate the dark reactions pH temperature O concentration ADP concentration

for the reaction shown here, draw the complete, detailed mechanism and major product

10.9 Hofmann Elimination 10.61 For the reaction shown here, draw the complete, detailed mechanism and major product. NH 1. CHI (excess) 2. Ag0 3. A

For each reaction between a ketone and an amine, draw the curved arrow or arrows to show the first step of the mechanism. and then draw the final organic product. If you accidentally change the structures given in the problem, click the undo button in the lower left. Reaction 1 Add the curved arrow or arrows. Select Draw Rings More C N 0 0 3

Indicate whether the following reaction involves CO or OH bond cleavage of the alcohol molecule. (Relevant parts of the mechanism are shown.) H H PBr3 to tar OH R 0 C H H Br R CO bond cleavage OH bond cleavage Both CO and OH bond cleavage. SN2 H R H BHOP Br

Given the following thermodynamic data, calculate the lattice energy of KC AHKCI(S)437 kJmol AHsublimation K89 kJmol Bond energy CICI 243 kJmol IE, (K) 419 kJmol EA, (CI)349 kJmol 1012 kJmol 1415 kJmol 1537 kJmol 717 kJmol 839 kJmol Please answer all the questions. save submit

Part A Calculate the pH after 2.575 mL of HCl have been added. Enter the pH to two decimal places. Part B Calculate the pH when 12.875 mL of HCl has been added. Enter the pH to two decimal places.

Piperazine, HN(C4H8 )NH, is a diprotic weak base used as a corrosion inhibitor and an insecticide and has the following properties 4.22 pKb2 8.67 For writing the reactions of this base in water, it can be helpful to abbreviate the formula as Pip Pip HO PipH HO PipH OH 2 PipH PipH OH The piperazine used commercially is a hexahydrate with

Label each variable in the equation below with the property it represents. number of moles power volume rate time integer voltage molarity universal gas constant osmotic absolute pressure temperature molar mass I by RT MRT nsolute Vsoln

Part A 55.3 K, 14.6 P, and 30.1 O Express your answer as a chemical formula. k O P 4 Submit Previous Answers Request Answer X Incorrect Try Again,Part B 24.5 Na, 14.9 Si, and 60.6 F Express your answer as a chemical formula. Submit Request Answer ,Part C 62.1 C, 5.21 H, 12.1 N, and the remainder O Express your answer as a chemical formula. 0

Rank the following in order of increasing strength of their respective intermolecular forces. Items (3 images) (Drag and drop into the appropriate area) A 8.8. Weakest to Strongest IMF,Rank the following compounds in order of increasing boiling point (BP). Items (3 images) (Drag and drop into the appropriate area) Lowest to Highest BP

What are the masses of the four different BrCl molecules Express the masses in atomic mass units using six significant figures, in decreasing numeric order (highest to lowest), separated by commas View Available Hint(s) VE 177.882,115.885, 115.884,113.887 Submit Previous Answers X Incorrect Try Again 5 attempts remaining amu,Part A Enter a

Part B Write the ions present in solution of AgNO3. Express your answers as chemical formulas separated by a comma. Identify all of the phases in your answers. Ag (aq),NO3(aq) Submit Answer Requested Part C Previous Answers Write the lons present in solution of Cu(O2H3O2)2 Express your answers as chemical formulas separated by a comma. Identify

The oxidation numbers of P, S, and Cl in HPO, HS, and KC1O4 are, respectively A) 1,1, 3. D) 1, 2, 7. B) 1, 2, 7. E) 1, 2, 3. C) 1, 2, 7.

Which substance is the reducing agent in this reaction Express your answer as a chemical formula. Hints 4 2KMnO4 3NaSO3 HO2MnO 3NaSO4 2KOH is the reducing agent.

Locate the chiral center(s) in the following compound. HO 5 2 4 5 3 1 OH,Locate the chiral center(s) in the following compound. OH 00 8 7 6 1 3 9 5 2 6 5 3 2NH,Testbank, Question 024 Identify the relationship between the following two structures. Enantiomers Identical Neither OH OH,Select the enantiomer of the following compound. H B. Testbank,

How many water molecules does it contain (density of water 1.0 gcm) Express your answer using one significant figure. IVE N PE HO molecules,A drop of water has a volume of approximately 0.04 mL

Writing Net lonic Equations Strong electrolytes dissociate completely in water to form their respective ions. The equation that represents this dissociation is known as the ionic equation. The equation that gives the description of all the ionic and nonionic species present in the reaction is known as the total ionic equation, which is the same as

How many moles of N2O5 will remain after 7.0 min ? How many minutes will it take for the quantity of N2O5 to drop to 1.9?10 ?2 mol ?

The firstorder rate constant for the decomposition of NO5, 2NO5 (g) 4NO2(g) O(g) S at 70C is 6.82 x 10 s. Suppose we start with 2.60102 mol of NO5 (g) in a volume of 2.3 L.

Part B Classify each of the following substances as an element, a compound, or a mixture. Drag the appropriate items to their respective bins. View Available Hint(s) Element boron nitride, BN hydrogen peroxide, HOOH vinegar argon, Ar Compound iron, Fe Mixture Reset Help,Part C Classify the following mixtures as homogeneous or heterogeneous. Drag

Part A electrophile Drag the appropriate labels to their respective targets. Use only pink labels for pink targets. conjugate acid nucleophile compound 4 compound 5 compound 6 compound 7 Submit OH 668 Request Answer 4 5 The strongest base, which is also the strongest among the compounds shown, is 6 O 7 Reset Help

Which ions remain in solution after PbI2 precipitation is completed? Express your answers as ions separated by a comma. Do not include phases

T 150 Pb NO Reactants 2 Kl(aq) Pb(NO3)(aq) Pb (aq) and 1(aq) combine to form a precipitate Products 2 KNO3(aq) Pbl(s) Because Pbl is ionic, it forms a 3dimensional structure.

4. What is the major product of the following reaction CH3 I CH3CH2CBr CH5ONa I CH3 A) CH2CHCHCH3 I CH3 B) D) E) CH3CH2COH I CH3 CH3 1 CH3 CH3CHCCH3 CH3 I CH3CH2COCH2CH3 I CH3 CH3CH2CH A) I C) III D) IV E) V I CH3 5. Which product would you expect from the acidcatalyzed addition of water to CH3 DOH IV OH V OH CH5OH III

How many molecules ofN2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02g/mol.

How many molecules of N204 are in 76.3 g NO4 The molar mass of N2O4 is 92.02 gmol. 5.54 x 1025 N204 molecules 7.26 x 1023 N204 molecules 1.38 x 1024 N204 molecules 4.59 x 1025 N204 molecules 4.99 x 1023 N2O4 molecules

Part 1 (1 point) Remember to use square brackets to show concentration. Do not include multiplication symbols in the rate equation. Do not places spaces in your answer. See Hint Write the rate law for the following reaction, which represents an elementary step in a reaction. Your rate law should not include the states of matter. socl(g) SO(g)

Label the phase diagram of pure solvent and a solution. Freezing point of solution Boiling point of solvent ATb AT Boiling point of solution GAS Freezing point of solvent SOLID LIQUID 1 atm Pressure Solution Pure solvent Temperature