Organic Chemistry Questions

Provide the correct IUPAC name for the compound shown here I

e References to access important values if needed for this question When the following molecular equation is balanced using the smallest possible integer coefficients the values of these coefficients are iron s oxygen g iron III oxide s

Provide the correct IUPAC name for the compound shown here H3C SH CH3

Which substance has the highest entropy at 25 C MgCO3 s O C H4 g CH3OH 1 O Clawanbitol

Buffers are solutions that buffer against large changes in pH when an acid or base is added Buffers contain a weak acid to neutralize added base and a weak base to neutralize added acid Most buffer problems want you to calculate the pH For example Calculate the pH of a buffer made from dihydrogen phosphate and hydrogen phosphate when the H PO4 4 44 x 105 M the HPO4 5 55 x 105 M and the K 6 20 x 108 i First identify the acid It s either H PO4 or HPO42 The acid is ii Then write the reaction for the acid dissolving in water iii Then write the expression for the Ka HPO42 H 0 Ka iv Then solve for H 0 and input the number Kal H 0 H O O HPO42 H 0 HPO42 v Finally calculate the pH 6 20 x 10 8X 5 55 x 105 because it has the most acidic hydrogens

For each of the following reactions indicate whether you would expect the entropy of the system to increase 1 AS 0 decrease D AS 0 If you cannot tell by inspecting the equation mark NA a CH OH 1 CH OH g b N O4 g 2 NO g c CO g H O g CO g H g d 2 KCIO3 s 2 KCl s 3 O 8 e HC H O2 1 HC H O s F N2 g O2 g 2 NO g ON H4 1 N g 2 H g 2 NH3 g H SO4 aq NH4 2SO4 aq

Which of the following is always positive when a spontaneous process occurs AHuniverse AHsurr ASuniverse AS surr

Of the following state functions only can be obtained without calculating a change first none of these E U all of these H as

In a spontaneous process e The reverse process occurs at a higher rate than the forward process a The reverse process is also spontaneous Od Forward and reverse processes occur at the same rate O c The path between reactants and products is irreversible Ob The path between reactants and products is reversible

13 31 Tetrahydrofuran THF can be formed by treating 1 4 butanediol with sulfuric acid Propose a mechanism for this transformation OH H SO HO 1 4 Butanediol Tetraburraturen

13 38 Propose a plausible mechanism for each of the following transformations a x b c f d f 1 EtMgBr 2 H O OH 1 H CEC 2 H O H SO 1 NaH 2 Etl X OH Na HO OH OEt

What is the pH of a solution prepared by mixing 500 mL of 0 10 M NaOCI and 500 mL of 0 17 M HOCI Please report 2 decimal places K HOCI 3 2 x 10 8

1 Which Sensory Facts information did you find most interesting Why

A mixture of methane and argon gases is maintained in a 9 25 L flask at a pressure of 1 71 atm and a temperature of 30 C If the gas mixture contains 7 23 grams of methane the number of grams of argon in the mixture is g Submit Answer Retry Entire Group 9 more group attempts remaining

Consider the reaction FeO s Fets O Fe O s Given the table of thermodynamic values Substance 1235 FeO s Fe O3 s O618 1 Fe s 0756 3 0 8 AH a 271 9 O 0 822 16 5 4x 60 75 27 15 Determine the temperature in C above which the reaction is spontaneous 205 0 89 96 This reaction is spontaneous at all temperatures

The inverse log or log as indicated by p can be reversed This converts pH back into H3O POH back into OH and pK back into Ka 1 Calculate the H3O when the pH 6 666 H30 1 10PH 10 6 666 2 Calculate the OH when the pOH 8 888 OH 10 POH 10 8 888 3 Calculate the Ka when the pka 7 777 Ka 10 pka 10 7 777 A 1 67 x 10 8 B 2 158 x 10 7 C 1 29 x 10 9

Label the components of the initiation step of protein synthesis Drag the appropriate labels to their respective targets View Available Hint s start codon peptide bond tRNA ribosomal subunit small amino acid mRNA strand 06 00 Reset 3 He

13 34 Identify the reagents necessary to accomplish each of the fol lowing transformations b 10

Question 25 Zinc metal will react with nitric acid vigoursly hint for acid formula ic ate What mass of zinc metal will react completely with 40 0 mL of 0 200M Nitric Acid need balanced equation O 0 26 g 0 98 g 3 1 g 1 2 g

Determine oxidation s for the following b CO3 C Fe Brz d CuI a NH CI Balancing redox equations using the half rxns in acidic soln use the steps Cr 1 2 Cr O I

Use your calculator for the following 1 When H3O 5 555 x 104 the pH this is an solution 2 When OH 5 555 x 104 the pOH this is an solution 3 When OH 5 555 x 104 what is the pH 10 14 using H30 OH 10 14 H O pH log this is an A acidic B basic or alkaline OH solution C neutral 10 14 5 555 x 104 D 1 800 x 10 11 E 10 745

4 How many mEq are in 4L of 0 75M CaCl2 5 How many ml of 4M NaOH would it take to neutralize 120ml of 1M HCI

5 How many ml of 4M NaOH would it take to neutralize 120ml of 1M HCI 6 Draw the structural formula for 2 methyl 1 pentanal

For the following reaction at equilibrium HCIO H O ClO H O HCIO is the H O is the clo is the H 0 is the 3 It is on the list of strong acids and so is a It is both a very It does not contain hydroxide so is a It is a The K approaches positive infinity a acid b base c conjugate acid e strong f moderately strong or weak d conjugate base 8 weak acid and a very acid base acid because it is on the list of strong acids base

If 3 16 g of CuNO3 is dissolved in water to make a 0 330 M solution what is the volume of the solution in milliliters

Sodium hydroxide is extremely soluble in water At a certain temperature a saturated solution contains 523 g NaOH s per of solution Calculate the molarity of this saturated NaOH aq solution

How many grams of solute are present in 985 mL of 0 380 M KBr

ences to access important values if needed for this question The formal charge is the charge an element would have in a molecule or ion if all of the bonding electrons were shared equally between atoms We can draw three inequivalent Lewis structures for carbon dioxide CO The concepts of formal charge and electronegativity can help us choose the structure that is the mc significant representation 1 Assign formal charges to the elements in each of the structures below Formal Charge 01 C 02 0 C 0 A 0 C 0 0 C 0 B C 000 2 The structure that contributes most significantly to the overall electronic structure of CO2 is V

Ice the following equations OUH FeO C Fe CO C 602 01 b AI H SO4 Al SO4 3 H C SO CS COA 1

Net lonic Equations on a Na CO3 HNO3 predict balance Solubility Complete ionic net ionic b MgCl AgNO3 NaNO3 H 0 CO

Identify the following molecule H H NA HIG H 0 O a glycerolol O b tri fatty acid O c wax O d triglyceride CH3 CH 3 CH3

Identify the following molecule H H OH H H H a OH OH cis fat Ob trans fat O c fatty acid O d glycerol 4

he above redox reaction use oxidation numbers to identify the element oxidized the element reduced the oxidizing agent and the reducing agent name of the element oxidized SiO32 2CI H 0Si 2CIO 2OH formula of the oxidizing agent name of the element reduced formula of the reducing agent

When all concentrations at equilibrium are known a numerical value for the constant can be calculated Give the value for the Keq given the following concentrations HF 0 030 M H3O 0 020 M F 0 020 M HF H O F H 01 F H 0 Keq A HE Hel HF B H O C F1 I D H 0 E 0 020 M F 0 030 M G 0 013 4

to access important values if needed for this Using average bond enthalpies linked above estimate the enthalpy change for the following reaction 2HBr g Cl g 2HCl g Br g

the above redox reaction use oxidation numbers to identify the element oxidized the element reduced the oxidizing agent and the reducing agent name of the element oxidized Cu OH 2 21 I2 Cu 20H formula of the oxidizing agent name of the element reduced formula of the reducing agent

Identify the species oxidized the species reduced the oxidizing agent and the reducing agent in the following electron transfer reaction Cl Ni 2CI Ni2 species oxidized As the reaction proceeds electrons are transferred from to oxidizing agent species reduced reducing agent

The following is a diagram of energy states and transitions in the hydrogen atom ENERGY A B C D E CC infinity n n 3 n 2 use the References to access important values if n n 1 Match each of the responses below with the correct arrow from the figure 1 The emission line with the longest wavelength 2 The absorption line with the longest wavelength 3 The emission line with the highest energy 4 The absorption line with the lowest energy 5 The emission line with the lowest frequency 6 The line corresponding to the ionization energy of hydrogen

For the following reaction 4 48 grams of nitrogen gas are allowed to react with 5 77 grams of hydrogen gas nitrogen g hydrogen g ammonia g What is the maximum amount of ammonia that can be formed What is the FORMULA for the limiting reagent What amount of the grams

1 How many ATOMS of nitrogen are present in 1 49 moles of nitrogen monoxide atoms of nitrogen 2 How many MOLES of oxygen are present in 4 81x1022 molecules of nitrogen monoxide moles of oxygen

Identify the following molecule H C O a glycerol O b trans fat O c fatty acid d cis fat OH

How many moles of NaOH are present in 12 5 mL of 0 110 M NaOH moles

The formal charge is the charge an element would have in a molecule or ion if all of the bonding electrons were shared equally between atoms We can draw three inequivalent Lewis structures for the bromate ion BrO3 The concepts of formal charge and electronegativity can help us choose the structure that is the best representation 1 Assign formal charges to the elements in each of the structures below Note Count oxygen atoms starting from the left for each structure Formal Charge Br 01 02 03 0 Br 0 A Br 0 0 0 B 0000 2 The best Lewis structure for BrO3 is Br 0 0 C needed for this question 0 0000 Previous

Bond Bond Energy kJ mol C 0 CI CI C CI C O 1072 242 339 732 Using the values of bond energy from the table above estimate the enthalpy change for the following reaction CO g Cl g COCI g kJ

NTERACTIVE EXAMPLE Specific Heat Capacity Calculations Using A 2 5 g sample of a metal requires 10 8 of energy to change its temperature from 23 C to 41 C Using the given information and table below determine t identity of the metal Substance Specific Heat Capacity J g C aluminum s 0 89 nickel s 0 50 iron s 0 45 0 38 0 24 0 13 copper s silver s gold s HOW DO WE GET THERE Determine the specific heat capacity of the metal Specific heat capacity s J g C

A piece of plastic has a thickness of 4 70 x 10 um Express this in meters nanometers and picometers nm pm

20 mL of 0 5 M HAn is combined with 10 mL of 0 2 M NaOH Complete the table below and calculate the Ka of the acid assuming the solution pH 5 00 and the total solution volume is 250 ml Enter the answer in the usual way

A chemist prepares a solution of Iron III bromide FeBr by measuring out 64 umol of iron III bromide into a 50 mL volumetric flask and filling the flask to the mark with water Calculate the concentration in mol L of the chemist s iron III bromide solution Round your answer to 2 significant digits M mol

A compound is found to contain 37 47 carbon 12 61 hydrogen and 49 92 oxygen by mass To answer the question enter the elements in the order presented above QUESTION 1 The empirical formula for this compound is QUESTION 2 The molar mass for this compound is 32 05 g mol The molecular formula for this compound is

Draw the products formed when each carbonyl compound reacts with the following amines 1 CH3CH CH NH 2 CH3CH2 2NH a O b C CI