Qualitative analysis Questions and Answers

Use Figure 23 1 to identify the family of lipids to which each of these molecules belongs a H b i OH 16 COOH CH OC CH CH2 15CH3 CHOC CH CH 13CH3 CH O P O O c CH CH2 C O CH CH CH CH CH CH

Oftentimes in a laboratory you will see designated storage areas for flammable and combustible materials chemicals What is the difference How should these chemicals be treated and stored differently

Identify the reaction that produces following compounds bromoethane and hydrochloric acid O a a CH CH CH 2 Cl O b C CH CH Br Heat or light Heat or light CH CH CH Cl Od CH CH CH Cl

or molecular motion in the substance 3pts 8 Use the phase diagram below to determine what is the phase of substance X when temperature is 30 C and pressure is 300 kPa 3pts Pressure kPa 500 400 300 200 100 0 Phase Diagram for Substance X solid 0 10 liquid 20 30 40 50 Temperature C gas 60 70 80

Underline 5 homophone errors 5 When I received the invitation in the male I was incredibly surprised I never thought I would see Nathan walk down the isle We had been friends since we were ate and he never showed an interest in getting married He was a bit of a loan wolf most of his life but the invitation suggested he had found his fare maiden I was looking forward to celebrating with him HOMOPHONE ERROR 1 Type here Correct usage Type here HOMOPHONE ERROR 2 Type here Correct usage Type here HOMOPHONE ERROR 3 Type here Correct usage Type here HOMOPHONE ERROR 4 Type here Correct usage Type here

f OH HON CH 1 0 1 CH S CH2 O 1 H N CH C reducing agent Ho

Explain how the following changes affect the rate of an enzyme catalyzed reaction in the presence of an uncompetitive inhibitor a increasing the substrate concentration at a constant inhibitor concentration b decreasing the inhibitor concentra tion at a constant substrate concentration 19 30 VALY chances regulate enzyme

Use the graph to show how each person s running total of enjoyment the sister s brother s changes over the course of eating ten pieces of candy Do you think it s best for everyone to eat all ten pieces If so why If not when would you suggest that each person stop Explain units of enjoyment 60 55 50 45 40 35 30 25 20 15 10 5 0 5 10 0 1 2 3 Cumulative Enjoyment 4 5 6 7 8 9 10 total pieces eaten

For the reaction N H O2 N2 2H O AH 622 4 kJ The quantity of heat produced by the combustion of 1 00 g N H is At Wt N 14 H 1 0 16 a 19 3 kJ b 20 07 kJ c 19 916 8 kJ d 19 916 8 kJ

3 The nuclide decays to by alpha emission The mass of Th is 230 033131 u of Ra is 226 025406 u and is 4 002603 u Calculate the energy released in the process is a 4 769 MeV b 7 46 MeV c 0 00512 MeV

3 Why should a positive reaction be observed when KMnO4 is added to the hydrolyzed aspartame solution

A sample of gas is held in a 7 18 L container at 316 K and 20 8 atm How many moles of gas are present a 2 26 moles b 30 6 moles c 5 76 moles d 0 0996 moles

2 How was TLC utilized in the aspartame experiment In other words what type of information could be revealed by this technique in the experiment

C H4 g 30 g 2CO g 2H O s According to the reaction 6 72 L of C H4 gas is burned per minute under normal conditions What is the rate of formation of CO gas in mol s A 0 06 B 0 05 C 0 03 D 0 02 E 0 01

below A E G Active Site Enzyme Substrate Enzyme substrate complex b Each figure illustrates a model of enzyme action Which model corresponds to which figure c Describe the differences between the two models C B Figure 1 oambyrine dres D H foolA

11 A volume of 50 0 mL of argon Ar is collected at 60 0 C and 820 0 torr How much does this sample weigh

5 The pressure of molecular hydrogen gas in a constant volume cylinder is 2 25 atm a C What will the pressure be if the temperature is raised to 80 0 C

Show calcu 1 A sample of molecular nitrogen gas N occupies 3 0 L at a pressure of 3 0 atm What volume will it occupy when the pressure is reduced to 1 0 atm and the temperature remains constant

7 10 Given the following CV diagram of an organometallic compound what are the two one electron reductions potentials SHE assuming a Ag AgCl reference electrode was used 2 A 1 5 2 0 2 5

01 Select one 1 Dimensional Analysis 2 Molar Concepts Question 6 Aluminum oxide has the following chemical formula Al2O3 A chemical reaction uses 31 4 grams of aluminum oxide as a reactant Only some of the aluminum oxide is used in the reaction leaving 17 8 grams unused How many moles of aluminum oxide were used in the reaction O 0 133 moles 0 482 moles 0 175 moles 0 308 moles n M 5 Periodic Table of the Elements Te the veli with biedrie S 121 ab Dea ulta ali HIST DIES C Mler 2018 CC BY

Mg s Pb aq Mg aq Pb s Note Reference the Standard reduction potentials at 25 C and Fundamental constants tables for additional informa Part 1 of 2 Round your answer to 3 significant digits K Part 2 of 2 Round your answer to 4 significant digits 0 0 kJ

Complete the following table for solutions at 25 C H3O OH pH 8 32 1 2 3 4 5 5 0 10 8 Na3PO4 and H3PO4 H CO3 and NaHCO3 M 2 3 1 0 x 10 12 BA 2 40 es Hiq Laimax acidic basic neutral Exercise N Identifying buffer solutions Ha State whether each of the following solutions represents a buffer system and explain why or why not M r 1010 H SO4 and K SO4 neutral Hall et at 9 0 M 0 x 0 HO Motx0X1HC M or x80 1H0

27 QUESTION 1 Choose the best instrumental configuration s if you wish to determine each metal on in a mixture of Cu Fe Fe and Ni2 solution without chemical separation ra Fluorescence spectrometer equipped with PMT detector b FTIR c UV visible absorption spectrometer equipped with PMT detector rd UV visible absorption spectrometer equipped with PDA e ICP atomic emission spectrometer rf Flame atomic absorption spectrometer 9 Graphite furnace atomic absorption spectrometer h A voltammetric measurement setup ri GC equipped with various columns packed and capillary and detectors TCD FTR NPR ECR and MS

a b a b Use the table to answer the following three questions Mass g Solution 1 2 3 4 NaCi 3 0 3 0 3 0 3 0 H O 100 0 200 0 300 0 400 0 Which of the following solutions is the most dilute Solution 1 Solution 4 Solution 5 6 7 8 Volume mL C H OH 2 0 5 0 9 0 15 0 Which of the following solutions is the most concentrated Solution 5 Solution 6 C Solution 3 d Solution 2 Solution 7 C d Solution 8 What is the percent concentration of C H5OH in Solution 5 Don t guess Do work on your scratch paper 0 2 1 9 C 2 0 d 22 H O 100 0 100 0 100 0 100 0 Which of the follwing is NOT a true colligative property freezing point lowering boiling point lowering hich of the following compounds provides the most solute particles when completely dissociated C vapor pressure lowering

Reactants Cu 0 Pb s Products Mass of solids SCH4U Unit 4 Electrochemistry Cu 24 Pb s 0 892012 g Mass of solids 0 892012 g Molarity of metal ag 0 1 M Molarity of metal aq 3 92983e 7 M Observations Blue liquid Date Observations Clear

2 How did life in big cities differ from life in small towns a City dwellers were more tolerant to drinking and gambling b City dwellers were open to new ideas in art science and politics c Cities were densely populated and people with different backgrounds came into contact with e another d All of the above

Helium gas at standard atmospheric pressure fills a balloon up to 1 19 L If the pressure increases to 314 psi what will be the new volume of the balloon in mL

How much volume will 18 3 grams of carbon dioxide occupy if it s heated to 412 K at 597 Torr

Complete the following structure by adding additional bonds and or lone pairs of electrons OH H C C N H HH Which of the following statements is correct O There are two pi bonds in this molecule O The H N H bond angle is 120 O There are nine sigma o bonds in this molecule O The carbon atom bonded to the oxygen is sp hybridized O The hybridization of N is sp

A gas at 517 K occupies 551 mL If it is cooled to 139 K what volume in mL will it occupy

Phthalonitrile CsH4N2 is produced by the ammoxidation of o xylene C8H10 according to the following reaction C8H10 1 O2 g NH g C8H4N2 S H O 1 How many grams of water would be produced by the complete ammoxidation of 20 8 moles of o xylene

Consider the reaction between bromine gas and chlorine gas at a particular temperature Br g Cl g 2 BrCl g When the system is at equilibrium the molar concentrations of Br2 Cl and BrCl are 0 0060 M 0 0095 M and 0 015 M respectively What is the value for K for this system 0 25

select the correct answer Which statement best describes how Della s love for Jim affects the plot O A It makes Della want to go out for shopping to buy pretty things for herself OB It makes Della realize that she loves her own looks more than she love jim OC It motivates Della to sell her hair so that she can buy a gift for jim OD It causes Della to quit her job in order to spend more time with Jim Raset Next

13 The arrow points to the bond in the ATP molecule that is energy rich Name the enzyme that facilitates this adenosine P P 2001 Adenosinetriphosphate ATP name of enzyme adenosine 10

2 When you add vinegar to water the pH level Drops b rises C drop a or rise

4 Use Hess s Law to determine the AH for the reaction shown below based on the information that follows 10 pts 2 Al s 3 Cl g 2 AICI s 2 Al s 6 HCl aq H g Cl g HCl g AICI s AH 2 AICI aq 3 H g AH 1049 kJ 2 HCl g AH 1845 kJ HCI aq AH 74 8 kJ AICI aq AH 323 kJ

The electrodeposition of scandium can be used to isolate the solid rare earth metal through the following reduction reaction Sc aq 3e Sc s What mass of Sc s can be produced in 75 min using a current of 2 24 A Choose the closest answer Relevant data 1 ampere A 1 coulomb per second Faraday s constant F 96 485 coulombs per mole of electrons Atomic weight of Sc 44 96 03 61 g 04 70 g 01 57 g 02 28 g

Complete the following table Molarity Name of solute sodium hydroxide potassium sulfate sodium chloride iron II nitrate hydrochloric acid ammonium chloride Dilution Initial concentration 6 00 M 4 50 M 3 50 M 6 50 M Formula of solute 0 200 L 350 mL 0 450 L Initial volume Final 450 mL Molarity 250 mL 1 60 M 0 950 M 1 20 M 1 20 M 0 900 M Volume of solution 0 500 L 2 40 M 275 mL concentration 2 30 M 450 mL 750 mL Moles of solute 1 20 L 0 45 mol 0 23 mol Final volume Complete all the following blanks correctly please 1 65 mol 800 mL 0 850 L Grams of solute 167 g 84 0 g Volume of water added 400 mL 0 550 L

6 What role do enzymes play in digestion 7 Name the enzyme present in the stomach What type of biological molecule does it wor

PH 3 9 orange pH 1 Brown bH 4 6 bright green pH 2 7 Pink pH 3 3 dark green PH 1 5 light Blue pH 3 0 purple Acid Red Base Blve Copp 4 001 M solution of HCl 7 pH of 7 1 34 10th Solution of HCL t is neutral 7 L of a solution containing olg of HCL pH 1 1 Yellow Round answers to tenths b A 09 M solution of H Bares 7 A pH 7 com 8 8 7 L of a solution containing 1 1 g of nitric acid 9 1 5L of a solution containing 5 bg of HI 10 7351 of a solution containing

How many moles is 9010 of H O 1 00 18 02 0 500

Consider the titration of H3C6H5O7 with NaOH Let s say that you need to add 0 04 mole of NaOH in order for the indicator dye to change color How many moles of H3C6H5O7 must you have had to start Report answer to the correct sig figs Do not provide units

c Catalysts speed up chemical reactions by lowering the activation energy of reactions Enzymes act as catalysts in your body Explain specifically in what way the enzyme lowers the energy of activation for the reaction shown above What is the enzyme doing that results in it being a catalyst lowering the activation energy and making the reaction go faster

Molecule H Quantum Calculated Amax nm Energy kJ mole Woodward Fieser Difference Calculated Amax nm Energy kJ mole

cess w many significant figures are there in each of the following numbers 710 6300 00 4100 0 7580 0

11 Molarity of solution that is made up 30 0g of sodium chloride dissolved in water to make 500 0mL of solution 2 35M 0 742M 1 03M

Consider the balanced chemical equation 4Cr s 302 g 2Cr2O3 s a What mole ratio would you use to calculate how many moles of oxygen gas would be needed to react completely with a given number of moles of chromium metal 2 mol O 3 mol Cr 4 mol O 3 mol Cr 3 mol O 2 mol Cr 3 mol O 4 mol Cr b What mole ratio would you use to calculate the number of moles of product that would be expected if a given number of moles of chromium metal reacts completely 3 mol Cr 03 2 mol Cr 4 mol Cr O3 2 mol Cr 2 mol Cr O3 4 mol Cr 2 mol Cr 03 3 mol Cr

IF you mutiply 3 84 cm x 2 179cm whats the answer to the corred number of Significant digits and units 8 43cm 8 43 cm 8 4 cm

A dime is found to have a mass of 2 13 grams Set up the problem below and calculate the mass of the dime in kilograms 2 13 g x Drag and drop your selection from the following list to complete the answer 1 kg kg 1000 kg

Name the type of crystalline solid formed by SiO2 O molecular solid atomic solid O ionic solid O amorphous solid O none of these