General organic chemistry Questions and Answers

Curved arrows are used to illustrate the flow of electrons Using the provided starting and product structures draw the curved electron pushing arrows to show the interconversion between resonance hybrid contributors Be sure to account for all bond breaking and bond making steps I I I I I I I I N H Select to Add Arrows H 1

M Ch What is the IUPAC name for the following compound OH 3 methylhexanoic acid O 4 methylhexanoic acid O 3 propylbutanoic acid O 4 propylbutanoic acid 0

Draw the major product formed when 1 3 pentadiene reacts with this acid Do not include any byproducts formed 1 I I I HCI 1 equiv Draw Major Product

Rank the following compounds from lowest to highest polarity 1 being the LEAST 6 being the MOST A CH3 B 0 H C D E 12 pts f

OA OB Predict the products A Br B OH HBr xs C Br Br D

Draw the skeletal line bond structure of 5 bromo 4 4 dimethylpent 2 yne Drawing

O A Predict the major product OB OH aaaa OH 1 CH CH MgBr 2 H 0 B C HO OH

Rank the orbitals with respect to the closeness of the orbital electron density to the nucleus Use 1 for closest and 4 for furthest S sp Drag and drop options on the right hand side to reorder and match with items on the left Reordering may cause items on the right hand side to swap positions 1 4

Write the balanced overall reaction for the three step mechanism 1 C H Br C H Br 2 C H H O C H OH 3 C H OH H O C H OH H O balanced overall reaction Select which species are considered intermediates in the reaction C H C H OH C H OH H O Br H O CH Br

energy 1 14 ff ff HOMO HOMO H C CH H C CH Q17 29 Level 1 Unanswered 1 attempt left Figure 17 40 Frontier molecular orbital interaction between two ethene molecules a MOs of ethene The most important HOMO LUMO interaction is indicated by the dashed line b Frontier orbital interaction between the HOMO of one ethene and the LUMO of another Frontier orbital interaction Match the symmetry of the ethene orbitals given in Figure 17 40 HOMO LUMO Drag and drop options on the right hand side to reorder and match with items on the left Reordering may cause items on the right hand side to swap positions Antisymmetic

7 44 Classify each of the following as a combination decomposition single replacement double replacement combustion reaction a CuO s 2HCl aq CuCl2 aq H2O 7 b 2Al s 3Br2 1 2AlBr3 s c 2C H g 5O2 g 4CO2 g 2H O 9 4 d Fe O3 s 3C s 2Fe s 3CO g e C6H12O6 aq 2C H6O aq 2CO2 g

What is the major product produced in the following Diels Alder reactions A B The 1 4 product is major The 1 3 product is major a H3CO b H3CO H3CO H3CO Filmeye 1 4 product

Find the amount of heat Q needed to raise the temperature of 5 00 g of a substance from 20 0 C to 30 0 C if the specific heat of the substance is 2 01 J g C Must show work to earn credit Include units in your answer

0 26 Calculate the number of moles in each of the following a 85 2 g of Ni b 144 g of K c 6 4 g of H O d 308 g of BaSO4 AE CC TI

Al2 CO3 3Al2O3 3C02 3Fe 30 2Fe O3 C H OH O2 CO H O MgCl Li CO MgCO 2LiCl Zn 2HCI H ZnCl It double replacement combustion

What is the correct order of reactivity for the following dienes from least to most reactive Drag and drop options into correct order and submit Diene C Diene B Diene A HO

How many grams of precipitate are made when 0 33 grams of iron III chloride reacts with an excess of silver nitrate 0 87g faci Agnoz Fellat Agct Fe 1003 3

Match the percent s character with the atomic orbital Drag and drop options on the right hand side to reorder and match with items on the left Reordering may cause items on the right hand side to swap positions s orbital sp orbital sp orbital 33 50 100

Rank the indicated C C bond lengths in the following molecule from longest to shortest longest at the top Drag and drop options into correct order and submit Bond 1 Bond 4 Bond 3 Bond 2 1 3 III

Select the correct ranking of stability for the carbocations A D from lowest to highest Drag and drop options into correct order and submit Carbocation D Carbocation A Carbocation B Carbocation C

How many grams of aluminum metal does it take to react completely with 2 5 grams of nitrogen gas 5 0 3

The two resonance structures of an allylic carbocation intermediate is given below If you consider these two resonance structures as isolated compounds which structure would be more stable A B Compound 1 because the charge is on a secondary carbon Compound 2 because the charge is on a primary carbon 1 2

Consider the initial conditions of a gas Variable T V P Variable T Initial Value V 400 K Determine the missing value for the final pressure given the other final condit 250 L 3 30 atm Final Value 1170 K 130 L

Protonation of isoprene can occur in two different locations to form two different resonance stabilized allylic cations Which is more stable A B C D 1 2 Compound 1 because the positive charge is on primary and secondary allylic carbocations Compound 1 because the positive charge is on a primary and a tertiary carbon Compound 2 because the positive charge is on a primary and a secondary carbon Compound 2 because the positive charge is on a secondary carbon isoprene H A H A and a tertiary A A

For the following equation H SO4 2NaOH 2H2 O Na SO4 Identify the limiting reactant when 9 65 g H SO4 reacts with 6 10 g of NaOH

quati how pure silver Ag is extracted from ores of AgK CN 2 potassium argentocyanide which is mined from the earth Zinc is a reactant in the equation and it is needed in order to extract the silver from the potassium argentocyanide ore 2AgK CN 2 aq Zn s 2 Ag s Zn CN 2 aq 2KCN aq 2004 T IN GOD WE TRUST https en wikipedia org wiki Silver media File American Silver Eagle obverse 2004 jpg How many atoms of pure zinc Zn are needed in the production process to create a pure silver coin of mass 34 01 grams Answer Zn atoms Format scientific notation using e for example 5 84x1016 is entered as 5 84e16

a Conservation of Mass Question 6 Fe O Fe O3 Select one a What should the coefficient for the diatomic oxygen O be when this equation is correctly balanced 1 O

Select one De a De H O2 2H O Which statement correctly supports the argument that the illustrated chemical equation shown violates the law of conservation of matter 12 O There are more hydrogen atoms on the right side of the arrow then on the left side O There are more hydrogen atoms on the left side of the arrow then on the right side O There are more oxygen atoms on the left side of the arrow then on the right side O There are more oxygen atoms on the right side of the arrow then on the left side

102 81 The following unbalanced equation shows how hydrogen and oxygen combine to form water Select one 18 2H O H O When the equation is balanced the coefficient for water H O will be O4 O 0 O2 O 1

Conservation of Mass Question 5 The following unbalanced equation shows how hydrogen and oxygen combine to form water 2H O H O When the equation is balanced the coefficient for water H O will be Select one 1 A

Conservation of Mass Question 7 How many water H O molecules will be in the beaker after the reaction Select one a O 2 a 811 50 Chemical Chemical Reaction 10 8 030 Reactants 8 8 88 bob 18 8 Container Q Bebe Reaction Chemical Products Conta Min Reaction

Choose all that apply 8 When a chemical equation is correctly balanced 81 0 all coefficients are in their lowest possible ratio each side of the equation has the same number of atoms of each element there must be a coefficient in front of each chemical formula

question 10 Which of the following is a correctly written chemical equation that demonstrates the conservation of mass Select one OH O H O O Mg HCI H MgCl OKCIO KC1 0 O H C H CO

culate the molar mass for each of the following 7 2 a MgCO3 magnesium carbonate used in antacids b Au OH 3 gold III hydroxide used in gold plating c C18H34O2 oleic acid from olive oil d C21H26O5 prednisone anti

stions 9 and 10 refer to the following A sample of seawater is analyzed The table below gives the concentration of some ions in the sample Concentration of Some lons in a Seawater Sample Ion Concentration M CI Na Mg2 SO4 Ca K 0 545 0 468 0 054 0 028 0 010 0 010 Determine the number of moles of the SO42 ion shown in the table in a 1 400 liter sample of the seawater S 0 4

a Select one De De Conservation of Mass Question 1 Which set of coefficients will balance this chemical equation De O O C2H4 g O2 g 1 2 1 3 O 2 5 O 2 3 O2 g 2CO2 g 2H O g

12 Calorimeters are used to measure bond energy by providing O A an open system where matter and heat can be exchanged with the surroundings O B A closed system where heat can be exchanged with the surroundings but not matter O C An isolated system where neither heat nor matter can be exchanged with the surroundings D A combined system where heat and matter can periodically be exchanged with the surroundings

Conservation of Mass Question 3 In a chemical reaction you begin with 18 atoms When the reaction is over you would expect to have atoms remaining Select one 8 O O There is not enough information to determine this more than 18 O 18 less than 18

6 In 1828 Friedrich W hler produced urea when he heated a solution of ammonium cyanate This reaction is represented by the balanced equation below H XK H N H C N O N C N Ammonium cyanate Determine the gram formula mass of the product in the given equation Urea

In a cup there is orange juice containing pulp and a few ice cubes Which choice best describes the contents of the cup 1 element O2 compound 3 heterogeneous mixture 04 homogeneous mixture 5 pure substance

Select one What should the coefficient for the aluminum Al be when this equation is correctly balanced a O 1 1 02 4 AIC13 O 3

Deduce the identity of the following compound from the H NMR data given C3H6Br2 2 4 ppm 2H quintet 3 5 ppm 4H triplet A CH3 2CHOCH3 B BrCH2CH2CN C BrCH2CH2CH2Br D CH3 3CCHO OA DE

What does the intensity or integration of a signal in the H NMR spectrum represent how many different types of protons are present how many protons of each type are present the electronic structure of the molecule close to each type of proton O how many neighboring protons are present

Predict the number of signals peaks expected in the H NMR spectrum of the compound shown below ignore splitting H3C 3 04 05 OCH3 CH3

The IR spectra below corresponds to which molecule wavelength um 4 4 5 5 5 5 6 2 5 100 80 60 40 20 4000 A O A OB STRANSMITTANOW OC C 3500 LOH 3 5 3000 B m 2500 CH O CH3 C C CH3 H C H H 2000 1800 1600 1400 1200 1000 wavenumber cm C OH CH 10 11 12 13 14 15 16 D CH CH OH E 800 600 CH C N

Which of these is an appropriate H NMR solvent A CHCl3 B C6H6 O A OB OC C CD3CN D CH3COCD3

The symbol for blue atoms is BI the symbol for orange atoms is Or a 1 Blue molecule and 2 Orange atoms react to form 1 Blue Orange molecule Select one Which chemical equation represents the reaction O Bl Or2 Bl Or2 O 2BI 20r 2BIOr O Bl 20r Bl Or 2BI Or2 2BIOr

A student measures the mass of a 1 00 g aluminum rod as 0 99 g The best estimate of the percent error associated with this measurement is

Calculate the number of moles of Li PO in 2 2 L o 4 0 60 M LI PO solution 4

a iservation of Mass Question 4 Which equation is correctly balanced for hydrogen and oxygen reacting to form water Select one 2H O 2H O O 4H O 2H O O H 0 H O H O H O