Chemistry Questions and Answers August 10, 2020

Some examples of steroids are shown here. CHOH C0 HO. aldosterone What basic ring structure is common to all steroids A A CH3CH2 C. OH tetrahydrogestrinone (THG), a designer synthetic steroid CHCH3 CH3 HO CH3 B. CH3 CH3 CHCHCH CHCHCH3 cholesterol D. CH

Label the following reaction energy diagram for a catalyzed and an uncatalyzed process. Transition State Products Uncatalyzed Ea(fwd) no catalyst Ea(fwd) with catalyst AHxn 0 Reactants Catalyzed AHxn 0 Ea(rev) no catalyst Ea(rev) with catalyst Reaction Intermediate Potential energy Transition State Ea(fwd) no catalyst AHxn 0 Transition State

Figure 1 of 1 H H CCCC Cumulene H H,Part B What types of orbital overlap occur in cumulene Check all that apply. 8sp overlap spsp overlap 8sp overlap spsp overlap 88 Overlap pp overlap spsp overlap Submit Hints My Answers Give Up Review Part Try Again 4 attempts remaining You have not identified all the correct answers. What type of orbital does

In the first step of glycolysis, the following two reactions are coupled Reaction 1 glucose P glucose6phosphate HO AG 13.8 kJmol AG 30.5 kJmol Reaction 2 ATP HO ADP P Answer the following four questions about the first step of glycolysis 1) Is Reaction 1 spontaneous or nonspontaneous nonspontaneous spontaneous 2) Write the net chemical

Which of these fabrics do you suspect will absorb dyes in a similar way? cellulose, wool, orlon, dacron.

OH OH Orlon (polyacrylonitrile) Cellulose (cotton) HO n fodr OH 87 CEN H R OH Wool (R amino acid residue) Dacron (polyester) n CHCH n n Dyes and Dyeing Chapter 14 Figure 143. Structures for various fabrics. PreLab Assignment Complete the PreLab Assignment found at the end of this experiment and turn it in to your TA at the beginning of the lab

For the following dehydrohalogenation (E2) reaction, draw the Zaitsev product(s) resulting from elimination involving C3-C4 (i.e., the carbon atoms depicted with stereobonds). Show the prodcut stereochemistry clearly. If there is more than one organic product, both products may be drawn in the same box. Ignore elimination involving C3 and any

action, draw the Zaitsev prodi Involving C3C4 (Le., the carbon atoms depicted with stereabonds). Show clearly. If there is more than one organic product, both products may be dra elimination involving C3 and any carbon atom other than C4. III Br H KOH EtOHheat

The following reaction is a singlestep, bimolecular reaction CH,BrNaOH CH,OHNaBr When the concentrations of CH3Br and NaOH are both 0.140 M, the rate of the reaction is 0.0080 Ms. (a) What is the rate of the reaction if the concentration of CH3Br is doubled Number U MS (b) What is the rate of the reaction if the concentration of NaOH is halved

hich of the following are commonly used oxidizing agents Select all that apply. chromic acid sodium borohydride sodium dichromate sodium dichromate sodium borohydride chromic acid hydrochloric acid chromic acid sodium borohydride chromic acid sodium dichromate sodium borohydride hydrochloric acid H CI hydrochloric acid

For the following electrontransfer reaction F(g) 2Cl(aq) 2F (aq) Cl(g) The oxidation halfreaction is (9) T The reduction halfreaction is (aq) Submit Answer Retry Entire Group 3 more group attempts remaining (aq)

EXPERIMENT 7 ACIDBASE TITRATION Name Instructor Weight KHP used mmol KHP used Vol. NaOH used Calculated M NaOH. Average M NaOH PostLab Report (Use the Inlab observations to complete the laboratory report. Turn in to your Instructor when you have completed the report.) Standardization of NaOH Sample 1 bod 22.4 Vol. unknown used Vol. NaOH used mmol

Which the following determines the peak height in a mass spectrum Select the correct answer. the relative abundance of the ion the charge of the ion the mass of the ion the number of isotopes present in the ion

In which of the following sets do all species have the same number of electrons Br, Br, Br 3 C.N.0 2 2 2 2 Ba Mg Sr CI, Ar, Ca Question 14 Write the name for Sn(SO4)2. tin(IV) sulfate tin(II) sulfite tin(1) sulfate tin(1) sulfite Otin sulfide

a) Which of the following reagents would oxidize Cr to Cr, but not Sn to Sn 2 Br Ca Co Br Ca b) Which of the following reagents would oxidize 1 to 12, but not Au to Au Br2 Co Br Co Ca Ca

Which of the following reactions is mostly likely for the following reagents You might need to look up their structures online. Chlorocyclohexane and methylamine in acetone O E2 OSN2 O SN1E1

12. Which of the following is NOT a conjugate acidbase pair a. d. e. NHANH2 H30H0 HO H2SO3HSO3 HSO3 HSO3 C2H302HC2H302 HC H 30 H All of the above are conjugate acidbase pairs. Cat

For the following liquid junctions, determine which side of the junction will be positive lon K A. 0.1 M NaCl 0.1 M KCI side will be positive right side will be positive B. 0.1 M KCI 0.1 M KI right side will be positive left side will be positive C. 0.1 M NaNO, 0.1 M KI right side will be positive left side will be positive Mobility (m(s.V)

Part A Fill in the blanks in the table below where both AH and AS refer to the system. Complete the table by dragging the labels to the appropriate targets. AS T Temperature dependent AG Temperature dependent Spontaneous Low Temperature Spontaneous Nonspontaneous High Temperature Spontaneous Nonspontaneous Nonspontaneous

Modify lysine, below, to show the predominant form at pH 7. HO O0 H H d CH CH CH CH NH NH H Modify the amino acid by adding or removing atoms or bonds, and by adding charges where appropriate. If you make a mistake or wish to reset the image, click on the red arrows in the drawing menu.

Which of the following is an aromatic compound that contributes to the beautiful scent of bacon Your answer O a. Me N 2,5dimethylpyrazine Me O b. Et Me N. Me 2ethyl3,5dimethylpyrazine O c. Both (a) and (b) O d. Neither (a) and (b)

Which of the following chemical equations violates the Law of Conservation of Mass 2 H O2 2 HO NaCl KBr NaBr KCI 2 H N HCI KOH co P 2 NH3 HO KCI

The flask shown here contains 0.130 g of acid and a few drops of phenolphthalein indicator dissolved in water. The buret contains 0.160 M NaOH. What volume of base is needed to reach the end point of the titration Number 0 mL base Assuming the acid is monoprotic, what is its molar mass Number 0 gmol mL 5 10 15 20 25 30 35 40 45 50 10 15 20 Reset

1. Which of the following best describes an example of pure chemistry (1 point) testing the effects of lower concentrations of a drug on humans studying chemicals containing carbon developing a cure for osteoporosis finding an antidote for a new strain of virus 2. Which of the following can be observed only in a microscopic view (1 point) foam

Match the proper Newman projection and conformation to these 3D molecules. eclipsed conformation staggered conformation Tip Rotate the molecules to see them more clearly. Click on a molecule to access its rotational controls. Drag and drop the blue labels for conformation and Newman projection into the box below each structure.

Part B Which of the following correctly represent the placement of electrons around each atom Drag each item to the appropriate bin. Nat F Br Ca Br Valid Na F NaF Br CaBr Na F Br Ca Br Reset Help Invalid

Which of the following statements about Lewis structures is FALSE An octet is when an atom has 8 valence electrons. A covalent bond occurs when electrons are shared. An ionic bond occurs when electrons are transferred. A duet is a stable electron configuration for helium. All of the above statements are true. Submit Provide Feedback Request

Which of the following solutions is acidic O O OH 1.0 x 107 M O OH 1.0 x 1010 M O H301.0 x 1010 M H30 1.0 x 107 M OH 1.0 x 107 M

Which of the following is a statement of Hesss Law a. The AH of a reaction depends on the physical states of the reactants and products. b. The AH for a process in the forward direction is equal to the AH for the process in the reverse direction. c. The AH for a process in the forward direction is equal in magnitude and opposite in sign to AH for

Each of the following structures is invalid. Identify the error in each case. octetrule violation wrong electron total T

Which of the following statements is true when considering temperature during a recrystallization More than one answer may be correct. It is important that the sample is dissolved in just enough hot solvent. Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Using ice to cool the sample will speed up the

Which chair represents the most stable conformation of Molecule A Molecule A OH O HW 4.14 a) O O A a 0 c c D d Ee Newman projections H d) OH OH b) H OH OH OH H OH e) OH H OH H c) H H OH Le

Which of the following statements about semiempirical methods are true Os faster to calculate than ab initio methods. It can be used for static molecules but not for reactions in which bonds are forming or breaking. It gives an exact solution to quantum mechanical equations. Some experimentally measured parameters are substituted into the

What are each of the following observations an example of Drag the appropriate items to their respective bins. Diffusion Submit Part C There is a gas leak in the kitchen and you smell gas in the bedroom after 10 minutes. eTextbooks Hints My Answers Give Up Review Part When person applies perfume in one corner of the room you can smell its

Which of the following is not true for a competitive inhibitor It binds to the enzyme at a site remote from the active site It has a structure similar to the substrate It occupies the active site Increasing the substrate concentration can reverse competitive inhibition It cannot be converted to products

Which of the following is an isoelectronic series Select one or more a. F, Cl, Br, I b. 02, F, Ne, Na c. Si, p2, s2, C1 Od. B5, Si4, As, Te e. S, CI, Ar, K

Which of the following has the lowest boiling point A) C5H12 B) C7H16 C) C9H20 D) C11H24 E) C13H28,Which of the following has the lowest freezing point A) HO B) N C) SO D) H E) CO,Which one of the following correctly ranks the compounds in order of lowest boiling point to highest boiling point based only in intermolecular forces A) CH3CHOH CH3OCH3

Which of the following tetrahedral intermediates will collapse to give an ester HO NH CH3 1 CI HO CH3 2 NH OCH 3,HO CH3 View Available Hint(s) 3 O OCCH3 OCH 3 HO CH3 4 O OCCH3 CI,View Available Hint(s) O 3 02 O 1 Submit

For which of the following is hydrogen bonding NOT a factor O H0 OCH4 C3H7OH ONH3 QUESTION 17 What type of forces exist between chlorine molecules in gaseous chlorine 000 Hydrogen bonds Dispersion forces lonic bonds Dipole forces QUESTION 18 Use the ideal gas law to calculate the temperature when 0.300 mol of nitrogen gas at 1.40 atm pressure

2) What is the coefficient for oxygen when the following equation is balanced KMnO,K0 MnO 50 8)2 D) 3 12) When the equation NR2Nbalanced the coefficient of hydrogen is 91 D) 4 13) What ions compose the compound magnesium phosphide and P 8) Mg3 and P A) Mg DMg6 and P6 24) When the equationOCH12CO HO is balanced the coefficient of O is A)S 5) 5 D) 8

Which of the following statements best describes the meaning of a glycoside Select one O It is the hemiacetal of a sugar. O It is the mirror image of a sugar. O It is the acetal of a sugar. O It is the enantiomer of a sugar. O It is the enolketo form of a sugar. It is an etherfunctionalized glucose.

gge Y How many resonance structures exist for the formate ion, HCO Express your answer as an integer. View Available Hint(s) Submit Part B Which of these molecules or ions exhibit resonance Drag each item to the appropriate bin. View Available Hint(s) O CO3 CC1, HO Exhibit resonance Reset Help Do not exhibit resonance,riodic Table rect Lewis e

A. B. C. D. In which of the following reactions will Kc Kp 4 NH3(g) 3 O(g) 2 N(g) 6 HO(g) SO3(g) NO(g) SO(g) NO(g) 2 N(g) O(g) 2 NO(g) 2 SO2(g) O(g) 2 SO3(g)

Consider the acidbase nature of barium nitrite, Ba(NO2)2, when it is dissolved in water. (1) What are the acidbase properties of the cation (2) What are the acidbase properties of the anion (3) Would an aqueous solution of barium nitrite be acidic, basic or neutral,Consider the acidbase nature of potassium nitrate, KNO3, when it is dissolved in

need help with 12, 13, and 14.

Which of the following substances contain ionic bonds MgCl2 HCI 9 O NaCl Question 13 Which of the following substances contain nonpolar covalent bonds HBr F N LICI Question 14 Which of the following substances contain polar covalent bonds N F LICI HBr 3 pts 4 pts

Which of the following is true of the intermolecular attractions in liquids Nonpolar molecules are attracted by dipole forces. Nonpolar molecules are attracted by dispersion forces. Nonpolar molecules are attracted by hydrogen bonds. all of the above none of the above

Thanks

Four amino acids are shown below. Identify the amino acids drawn in the L configuration. COO COO COO HN C H H HCNH3 H3N C H If I f CH CH H C OH CH CH H CH3 COO asparagine glutamate serine HN Select all that apply. serine asparagine isoleucine glutamate COO NH3 CH isoleucine

for the following reaction, how do you find how many electrons transferred? i understand you must write out and balance the half reactions but i am not sure how to do that. thanks

Identify the oxidation numbers for all the elements in the reactants and products for 2 MnO (aq) 382 (aq) 4HO(1)3 S(s) 2 MnO (s) 8 OH(aq) Identify the oxidation numbers by dragging the appropriate labels to their respective targets. 7 5 2 1 0 1 2 3 4 7 Reset Help 1 2 0 2 2 MnO4 (aq) 3 S2 (aq) 4HO(1) 3S(s) 2 MnO (s) 8 OH(aq)

Which of the following reactions would have the smallest value of K at 298 K More information is needed to determine. ABC E cell 1.22 V AB 3C E cell 0.15 V A2BC E cell 0.98 V AB 2C Ecell 0.030 V

The eleven competing robotic RDManufacturing projects are given code names P1 to P11. Each project is associated with a single new product that could be developed by RD, with a prototype to be built by Manufacturing. The following is known for each project a. The projected two year RD and initial manufacturing cost. b. The estimated five year NPV.

11. Identify the location of oxidation in an electrochemical cell. A) the salt bridge B) the socket C) the cathode D) the electrode E) the anode 12. Determine the cell notation for the redox reaction given below. 3 Cl(g) 2 Fe(s)6 Cl(aq) 2 Fe3(aq) A) Fe(s) Fe3(aq) Cl(g) Cl(aq) Pt B) Fe 3(aq) Fe(s) Cl(aq) Cl(g) Pt C) Cl(g) Cl(aq) Pt

Please help! Thanks :)

For the following reaction, choose the most likely reaction pathway and draw the major product. Only draw the resulting organic species, omit counterions. Br HC CH CH HC O O O O SN1 E2 SN2 E1

For the following reaction, draw the major organic product(s). Do not draw inorganic side products. 1st attempt Cl FeCl3,Draw the major product(s) that result from the following reaction. Do not draw inorganic side products. HNO3 8 Conc. HSO4 CH3 CH3

How is the miscibility of a liquid with water related to the liquids polarity O The less polar the liquid, the more likely that it is miscible with water. The polarity of a liquid does not affect its miscibility with water. The more polar the liquid, the more likely that it is miscible with water. O The more polar the liquid, the less likely that

Which of the following statements is true for an octahedral complex ion The dz orbital is not equal in energy to the dxy orbital because only the dx y orbital is in direct contact with the ligands The dz orbital is not equal in energy to the dxy orbital because only the dz orbital is in direct contact with the ligands The dz orbital is equal in

Please answer it

Which of the following pairs of elements are likely to form ionic compounds Check all that apply. chlorine and bromine helium and oxygen magnesium and chlorine nitrogen and oxygen potassium and sulfur sodium and potassium

Which of the following is not an oxidationreduction reaction a) 2 Na(s) Br(g) 2 NaBr(g) b) 2 C(s) O(g) 2 CO(g) c) HCO3(aq) HO(l) CO(g) 2 HO()2 H(g) O(g) el Fe(s)2 HCl(aq) FeCl(aq) H(g)

For the following reaction 1) Add curved arrows for the first step. H H3C CH3 H HC 2) Draw both the organic and inorganic intermediate species. Include nonbonding electrons and charges, where applicable. Add a curved arrow to show how the final product is formed. H3C H C H H CH3

In the phase diagram for water, indicate the direction that the solidliquid and liquidgas coexistence lines will move along the temperature axis after the addition of solute. Pressure (atm) R F V solid 5 T G B 6 Temperature (C) careers privacy policy ma MacBook Pro Y H liquid 7 N N U J 00 8 M I gas contact us help ( 9 K O V. H O L command P

Given the following balanced chemical equation 4KO2HO 4KOH30 How is the rate of appearance of O2 related to the rate of disappearance of KO2 OA A) d0 dr D) 4d KO 3 dr dr B C D OE OF B) E) 34 dKO dr 3 dKO dr C) F) 4dKO dr 3 1dKO 4 dr

What functional groups are shown in the IR spectrum shown below 100 50 D 4000 alcohol nitrile (i.e., RCN) aldehyde ester ketone 3000 2000 Mam 1500 1000 500,What functional groups are shown in the IR spectrum shown below LOD W ketone ester 9000 2000 carboxylic acid aldehyde alcohol nitrile (i.e., RCN) None of these other choices is correct. 1000

Y Part C How does the density of a gas depend on the molar mass of the gas The density will increase as the molar mass of the gas increases. The density does not depend on the molar mass of the gas changes. The density will decrease as the molar mass of the gas increases. Submit Request Answer,Item 11 Y Part A How does the density of a gas depend

1 Which of the following multistep reaction pathways will give a higher yield and why (CH)CH(CH), Br 2 2 KCN KCN (CH)CH(CH)CN CH(CH)CHCHBr CH(CH)CHCHCN OH HO HO OHHO HO (CH)CH(CH)COOH CH, (CH)CHCHCOOH Pathway 1, because there is much less steric hindrance for primary substrates than for secondary substrates in the SN2 reaction, which is the first

Print Calculator 1 of 15 Incorrect X Incorrect X apling Learning Periodic Table Which of the following statements regarding entropy is false A rock falls to strike the ground. The entropy of the rock and ground increases. Crude oil is refined to make gasoline. The entropy of the crude oil increases. A layer of salt then a layer of pepper are

For the following reaction, choose the most likely reaction pathway and draw the organic product. Remember to include formal charges. Do not include side products. 0000 E1 SN1 E2 SN2

Label structures on the mitochondrion below. Then determine the direction of ATP, phosphate (Pi), and passive hydrogen ion (H) transport across the inner membrane by transport proteins. intermembrane space cristae outer membrane ATP H Pi matrix

MalonylCoA is an intermediate in fatty acid synthesis. It also regulates fatty acid metabolism. Which of the following molecules regulate the enzyme that catalyzes malonylCoA synthesis fatty acids or fatty acylCoA carnitine oxaloacetate acetylCoA citrate Which of the following enzymes does malonylCoA regulate high concentration of high

Which ions remain in solution, unreacted, after each of the following pairs of solutions is mixed, Part B iron(II) nitrate and rubidium sulfide Express your answer as an ion. If there is more than one answer, separate each by using a comma. Submit Request Answer Part C Submit ammonium phosphate and zinc bromide Express your answer as an ion.

Identify whether the mixing of each pair of solutions results in a buffer Check all that apply. The mixing of 50.0 mL of 0.10 M HCl and 35.0 mL of 0.150 M NaOH 125.0 mL of 8x102 M NH3 and 140.0 mL of 0.20 M NaOH 185.0 mL of 0.10 M NH3 and 150.0 mL of 0.20 M NaOH 50.0 mL of 0.10 M HF and 20.0 mL of 0.10 M NaOH 100.0 mL of 0.10 M NH3 and 100.0 mL of

Identify the thylakoid membrane of the cyanobacterium shown here. 1 m Thylakoid membranes The thylakoid membrane of the cyanobacterium is a nucleoid membrane. The thylakoid membrane of the cyanobacterium is a chloroplast membrane. The thylakoid membrane of the cyanobacterium is an infolded plasma membrane. Submit My Answers Give Up

Gold has always been a highly prized metal, widely used from the beginning of history as a store of value. It doesnt rust like iron and doesnt become tarnished like silver. It is so chemically inert that it wont react even with the strongest concentrated acids. But it can be dissolved in aqua regia a freshprepared mixture of concentrated HNO3 and

Given the heterocycle below, add to the predrawn structure to show the expected major product. Br 0 Br Br 8 Br Incorrect. Though bromine is an orthopara director, the ring sulfur also directs substitution. Both directors lead to a different position for substitution.

Item 5 Y Part B KCI Express your answer as an ion. 0 Submit Part C Request Answer Pbl Express your answer as an ion. ESPRE M ,Submit Request Answer Part D LiO Express your answer as an ion. 0 Submit Provide Feedback Request Answer

The following reaction between ethyl alcohol and ethyl bromide forms diethyl ether via a substitution reaction (followed by deprotonation). (a) Determine the electrophilic site of the substitution reaction. Highlight it in the reaction below. OH OH Br HBr Br Click on an atom to select it click again to deselect it. A selected atom will be

Which of the following solutions will have the highest electrical conductivity A) 0.10 M KF B) 0.045 M Al2(SO4)3 C) 0.10 M Nal D) 0.050 M (NH4)2CO3 E) 0.10 M LiBr

Given that the density of CaO(s) is 3.34 g/cm3 and that the length of an edge of a unit cell is 481 pm, determine how many formula units of CaO there are in a unit cell.

Given that the density of CaO(s) is 3.34 gcm and that the length of an edge of a unit cell is 481 pm, determine how many formula units of Cao there are in a unit cell. Number formula units Based on your answer above, how is the unit cell of CaO(s) likely to be structured same as NaCl(s) same as CsCl(s) neither CsCl(s) NaCl(s)

?Given these reactions,what is ?Hrxn for this reaction?

Given these reactions, X(s) 0(g) XO(S) XCO3(s) XO(s) CO(g) what is AHrxn for this reaction X(s) O(g) CO(g) XCO3(s) AH758.7 kJmol AH 150.1 kJmol Number 0 kJ mol

The following questions refer to the following system 500.0 mL of 0.020 M Mn(NO3)2 are mixed with 1.0 L of 1.0 MNa2C2O4. The oxalate ion, C204, acts as a ligand to form a complex ion with the Mn2 ion with a coordination number of two. Mamm uloz vilidutoc Mn C204 MnC04 7.9 x 103 soosiadura vorba (A osmani blow H (8 Mn(C204)2 MnC204C204 1.26 x 10

For the following SN2 reaction, draw the organic and inorganic products of the reaction, and identify the nucleophile, substrate, and leaving group. Include wedge/dash bonds and H on a stereocenter.

Br H OCH3

Which of the following is a postulate of the kinetic molecular theory of gases The average kinetic energy of the gas particles is directly proportional to the absolute temperature of the gas. O The average kinetic energy of the gas particles is inversely proportional to the square of the absolute temperature of the gas. The average kinetic energy

Identify reagents by letter from the reagents table for each step in the following scheme. Some steps may require more than one reagent. Enter the first reagent on the left. a b Not Submitted d Br CH31 (1) CH3CHl CHCHCHBr EC Na f e CHl2Zn(Cu) ether g (2) h Reagents H Lindlar catalyst HOHSO4 HgSO4 1. BH3 in THF 2. HO in NaOH i j k I 1. 03 2. ZnH3O

a) The following sequence represents part of the primary structure of collagen ProProAlaProProGln What amino acid is represented in the sequence by a question mark Enter your answer as the threeletter amino acid abbreviation. b) Proline and hydroxyproline make up about 30 of the remaining residues. The structure of proline is shown at right.

Which of the following pairs of formulas represent isomers OCH3 CH3 1 1 H2 I CH3 OCH3 CH2 23 O CH, CH, CH, CH, CH3 CH3 I and CH3 CH2 CHCH3 CH3 CH3 CH3CHCHCH3 and CHCHCH and CH CH CH and CH3 CH2 CH I CH3 I C H3 C CH3 C H3 and CH3 CH3 CH2 C CH3 CH3 CH3 CH CH3

13. Give the direction of the reaction, if K 1. A) The reverse reaction is favored. B) Neither direction is favored. C) If the temperature is raised, then the forward reaction is favored. D) The forward reaction is favored. E) If the temperature is raised, then the reverse reaction is favored. 14. Express the equilibrium constant for the following

Given these reactions, where X represents a generic metal or metalloid, 1) H2(g)+12O2(g)?H2O(g)?????1=?241.8 kJ 2) X(s)+2Cl2(g)?XCl4(s)?????2=+278.7 kJ 3) 12H2(g)+12Cl2(g)?HCl(g)?????3=?92.3 kJ 4) X(s)+O2(g)?XO2(s)?????4=?747.7 kJ 5) H2O(g)?H2O(l)?????5=?44.0 kJ what is the enthalpy, ?H, for this reaction? XCl4(s)+2H2O(l)?XO2(s)+4HCl(g)

Given these reactions, where X represents a generic metal or metalloid, 1) H(g) O(g) HO(g) AH 241.8 kJ 2) X(s) 2Cl(g) XC14(s) AH 278.7 kJ 3) H(g) Cl(g) HCl(g) AH392.3 kJ 4) X(s) O(g) XO (s) AH4 747.7 kJ 5) HO(g) HO(1) , 44.0 kJ what is the enthalpy, AH, for this reaction XC14(s) 2 HO(1) XO (s) 4 HCl(g) AH kJ

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Which of the following statements about gases is false O Gases are highly compressible. Nonreacting gas mixtures are homogeneous. O All gases are colorless and odorless at room temperature. O Gases expand spontaneously to fill the container they are placed in. Distances between molecules of gas are very large compared to bond distances within

Which of the following statements about sodium is false Select one Sodium ions are a significant component of seawater. O b. Sodium reacts with water to produce sodium hydride and oxygen gas. Sodium metal is produced by electrofysis of sodium chloride. O d. Sodium reacts with oxygen to produce sodium peroxide. Sodium metal is a strong reducing

Part A Use the data below to calculate the heat of hydration of lithium chloride. Express the answer in kilojoules per mole using three significant figures. AHhydration Submit Compound Lattice energy (kJmol) A Hsoln (kJmol) LiCl 834 37.0 NaCl 769 15. Request Answer P 3.88 kJmol,Part B Calculate the heat of hydration of sodium chloride. Express

Part A Select the sketches of a 3d orbital. Check all that apply 0 0 0 k Submit Previous Answers Request Answer,X Incorrect Try Again 5 attempts remaining You have not selected all of the correct sketches. The d orbitals have n 3, and thus they planes, while the fifth is orientated along a single axis. Part B Compare the characteristics of 4d

Which of the following are valid ionic Lewis structures Drag each item to the appropriate bin. 2.04 Valid Na Br FF Ca F NaBr F Ca Na Br F Ca F Invalid reset help,Which nonmetals could form an ionic compound with magnesium with the formula MgX (where X represents the nonmetal) Drag each item to the appropriate bin. Possible FN Br Oas Not possible

Hexane is an unbranched alkane with thecondensed structure CH3CH2CH2CH2CH2CH3 .

Hexane is an unbranched alkane with the condensed structure CHCHCHCHCHCH. Draw the complete structure of hexane. Show all hydrogen atoms. Incorrect HHHH HCH CHC H

Which of the following diatomic species are paramagnetic and which are diamagnetic A blank molecular orbital diagram (Figure 2) has been provided to help you. Drag the appropriate items to their respective bins. View Available Hint(s) Diamagnetic Liz Paramagnetic Li Reset 2 B Help You sorted 2 out of 3 items incorrectly. A species with an odd

In which of the following is it necessary to use an expanded octet to represent a Lewis structure which has zero formal charge on the central atom 2 A) SO4 B) SiClF2 C) CO3 D) PO4 E) SO3 A and B only OC, D, and E only O E only A, D, and E only D and E only

Give the IUPAC name for the following alkane. ball stick Name 3propylhexane labels Incorrect The longest continuous chain determines the parent name. For example, if it contains six carbons, the compound is nam Numbering for this compound is shown below. et,Give the IUPAC name for the following alkane. ball stick labels Name 3propylhexane

Phosphine, PH3(g), combusts in oxygen gas to form water vapor and solid tetraphosphorus decaoxide. Express your answer as a balanced chemical equation. Identify all of the phases in your answer. A chemical reaction does not occur for this question. Submit Part D Request Answer When solid mercury(II) nitrate is heated, it decomposes to form solid

Which of the following statements about reducing sugars are true The oxidation of a reducing sugar forms a carboxylic acid sugar. A reducing sugar will not react with the Cu in Benedicts reagent. DMannose (an aldose) is a reducing sugar. Reducing sugars contain ketone groups instead of aldehyde groups. A disaccharide with its anomeric carbons

Part A Which of the following is the best Lewis dot structure for oxygen O O O O a b Q e Submit Request Answer Part B Submit d f 0.0. 0.0.0 0 How many electrons should be shown in the Lewis dot structure for hydrogen Express your answer as an integer. Request Answer a,Part C Which of the following is the best Lewis dot structure for chlorine O O O

Part A PC13 Br2 is a nonpolar molecule. Based on this information, determine the ClPCl bond angle, the BrPBr bond angle, and the ClPBr bond angle. Enter the number of degrees of the ClPCl, BrPBr, and ClPBr bond angles, separated by commas (e.g., 30, 45,90) degrees Submit Hints My Answers Give Up Review Part Part B Which statement best describes

Give the number of pi electrons in the ring for each of thefollowing structures.

Part P Give the number of pi electrons in the ring for each of the following structures. CH3 H 666 Express your answers as integers separated by commas. H 15.

Part A Identify the more metallic element from each of the following pairs. Match the words in the left column to the appropriate blanks in the sentences on the right. less more When comparing Zn and Hg. Zn When comparing P and Ge, P is When comparing Ba and Pb, Ba is When comparing Cu and Ru, Cu is metallic than Hg. metallic than Ge. metallic

e 1 of 1 (ii) (iii) Part F Name an element A that is expected to lead to the AF4 structure shown in (i). Express your answer as a chemical symbol. Submit Provide Feedback Request Answer Next

less branches a stronger nucleophilic 4. Which of the following species is the LEAST nucleophilic A. HO B. BF3 8 9 C. (CH3)3N 7 5. Which of the following species is the MOST nucleophilic A. H2O 8 D. CH3OH C. (CH3)3N 8 D. CH30 8 B. BF3 9 F (D) Br E) OCH3 aprotic solvant 7. Which of the following solvents is the best for an SN2 reaction A. DMSO B.