Qualitative analysis Questions and Answers

MISSED THIS Watch IWE 4 12 Read Section 4 10 You can click on the Review link to access the section in your eText Part A Copper II fluoride contains 37 42 F by mass Use this percentage to calculate the mass of fluorine contained in 54 5 g of copper II fluoride Express your answer in grams to three significant figures Mr AEO 2822 g

Answer can be in bullet points or complete sentences 2 3 max Based on the information discussed in chapter 4 provide 2 pieces of evidence that support the endosymbiotic theory

According to VSEPR theory what are the bond angles of silicon tetrachloride SiCl4 s O 104 5 109 5 120

Which one of the following is correct concerning flaxseed It contains lignans which have possible anti cancer effects It is low in fiber None of these statements is correct It is not safe for human consumption It contains only omega 6 fats It has a constipating effect Question 39 1 point Saved

5 fluid oz of a 2 acid solution was mixed with 11 fluid oz of a 66 acid solution Find the concentration of the new mixture

A sample of water molar mass 18 02 g mol containing 2 00 moles is initially at 30 0 C If the sample absorbs 2 00 kJ of heat what is the final temperature of the water specific heat of water 4 184 J g C A 15 3 C B 30 2 C C 43 3 C D 46 7 C F 63 7 C

7 32 moles of sodium phosphate reacts with excess calcium chloride producing calcium phosphate and odium chloride as shown in the reaction equation below Na3PO4 CaCl Ca3 PO4 2 NaCl Balance the chemical reaction equation and calculate the number of moles of sodium chloride produced

Hot dogs are mostly protein fat and water After removing the water from a hot dog it weighs 100 grams The label says 80 fat free by weight How many calories come from fat 720 calories 320 calories 180 calories 900 calories 90 calories None of these options is correct

The accepted value of the melting point of pure flurbiprofen is 390 K Trying to verify that value you obtain 389 K 391 K 386 K and 394 K in four separate trials Your partner finds 394 K 394 K 394 K and 392 K a Calculate the average value and percent error for your data and your partner s data Your average value K Your partner s average value Your percent error K

of figurative language used in the paragraph Megan s children were a headache Although she loved them dearly she always felt like she was dealing with a minor crisis They would often bang and crash around the house and sometimes she felt like she was a clean up crew She was exhausted at the end of every day and her bed would groan as she sank down into it FIG LANGUAGE 1 Type here Type here FIG LANGUAGE 2 Type here Type here FIG LANGUAGE 3 Type here Type here FIG LANGUAGE 4 Type here Type here FIG LANGUAGE 5 Type here Tyne here

Calculate the wavelength of an electron traveling at 2 85 x 107 m s Hint mass of electron 9 11 x 10 31 kg h 6 626 x 10 34 kg m s 5 55 x 10 8 m 02 2 55 x 10 10 m 2 74 x 10 9 m 3 75 x 10 9 m 5 95 x 10 10 H 3 D2L Quizze

2 Dilute your acid solution from part A to make 500 0 mL of a 0 200 mol L acid solution Complete the dilution calculation below to determine the amount of stock acid solution required in mL 3

Determine AH kJ for the following reaction using the listed enthalpies of reaction 2NO2 g 4 H O 1 AHO kJ 180kJ AHO kJ 112kJ AHO kJ 571 6kJ N2 g 2O2 g N2 g O2 g 2NO g 2NO2 g 2NO g O2 g 2H2 g O2 g H O l

Why did the author write this passage O to provide information on the number of working students O to present different views on the issue of working students to inform teachers about the negative impact of C working students to take a position in favor of working students

10 3 Fe O3 s CO g 2 Fe3O4 s CO2 g 4H 4H Products 2 A Peactants 4 2 1118 4 393 5 16 82912 110 5 AH 2 1118 4 393 5 3 821 2 110 5 4 1 146 AH 4992 4

CALCULATE A lab technician performed a titration to determine the concentration of acid H in a sample of water taken from a stream near a old closed mine She filled her burette with 0 00500 M NaOH solution In her test flask she measured 15 00 ml of the acidified stream water Her initial volume reading of NaOH solution in the burette was 0 70 ml After reaching the endpoint of the titration she read the volume of NaOH in the burette again and wrote down 5 50 ml Determine the H 1 concentration MA of the stream water using the data above a

Compound H kJ mol CO g 110 5 CO g 393 5 F O4 s 1118 4 Compound Fe O s H O l H O g 9 2 NaCl s F2 g 2 NaF Cl2 g H kJ mol 824 2 285 8 241 8 60 2 Fe3O4 s CO2 g HCI g NaCl s NaF s 92 3 411 0 569 0 J mol NH Cl s 3154 NO g 90 4 NH CH s 315 4

1 2 puntos Baeyer s reagent is a violet solution used for detecting certain chemicals To make it you dissolve 1 00 g of KMnO4 in 100 0 mL of water What is the molarity of that solution Ingrese su respuesta

a D 7 Which graph would benefit the most from a catalyst Left graph Both graphs c Right graph d Neither 8 If a catalyst was added to both graphs which graph would experience a decrease in activation energy c Right graph d Neither Left graph Both graphs Potential Energy Activation energy Activation energy 100 Products Reactants Reactants energy released Reaction Progress Potential Energy Products energy absorbed Reaction Progress

CO g 110 5 CO g 393 5 F304 S 1118 4 9 2 NaCl s F2 g 2 NaF s Cl2 g 03 Fe 0 Fe O3 s H O l H O g 00 824 2 285 8 241 8 B HCI g NaCl s NaF s H KJ mol Compound H kJ m 92 3 NH Cl s NO g NH4Cl s 315 4 411 0 569 0 315 4 90 4

Calculate the number of oxygen atoms in a 60 0 g sample of diphosphorus pentoxide P O5 Be sure your answer has a unit symbol if necessary and round it to 3 significant digits

Which of the following compounds is an ether O CH3CH2OH O CH30CH3 O CH3 COOH

4 students determine the density of 4 pieces of copper metal by water displacement method Below are their their mass and volume measurements and the calculated density Student mass volume calculated density 82 48 g 10 28 mL 8 02 g mL 70 15 g 7 56 mL 9 28 g mL 60 57 g 5 99 mL 10 12 g mL 85 47 g 10 10 mL 8 42 g ml 8 97 g mL A B C D Average density Given that the theoretical density of copper is 8 96 g mL how would you describe the average density result in terms of accuracy and precision The density results are neither accurate nor precise The density results are accurate but not precise O The density results are not accurate but precise The density results are both accurate and precise

the presence of more than one hydroxyl group their cyclic structures the presence of at least one hydroxyl group the presence of a carbonyl group usually on the 1 carbon atom O the presence of at least one chiral carbon atom Pregunta 68 The process in which information contained in RNA is used to manufacture protein called translocation O replication O transcription mutation

4 Match each of the following terms with the correct definition or description Definitions are used only once not all of the definitions will be used Pyrogen Pyogenic Antigenic variation Axenic LAB Parenteral Virulence Prodromal Incidence latrogenic A A description of how few pathogens are required to cause disease B A molecule that triggers a fever C A period of disease with vague symptoms D An important group of aerotolerant anaerobes E Caused by medical treatment F Describes a pathogen that causes pus formation G Inanimate object involved in indirect contact transmission H No foreign organisms present I The number of new cases of a disease J The process of blood cells leaving capillaries K The process of changing surface proteins to avoid detection L The total number of cases of a disease M Transmission through a puncture wound for example

Find the digits in the tens place in the hundredths place and in the thousandths place for the following number 891 6152 tens 1 C X

42 This is an example of a neurotoxin A Cholera toxin B Diphtheria toxin C Endotoxin D Staphylococcal enterotoxin E Tetanus toxin 43 Beta lactam drugs interfere with the production of A DNA B Folic acid C Peptidoglycan D Phospholipids E RNA 44 Gut dysbiosis is a risk factor in which of the following diseases conditions A Autism B Depression C Diabetes D Schizophrenia E All of the above

15 This organism is a yeast A Bordatella pertussis B Penicillium notatum C Plasmodium falciparum D Saccharomyces cerevisiae E Treponema pallidum 16 This enzyme is responsible for connecting Okazaki fragments during DNA replication A DNA polymerase B Helicase C Ligase D Primase E RNA polymerase

3 Improve the word choice of the 3 underlined words below When I was a kid I used to collect lots stamps of stuff I had loads of rare that definitely paid off I sold them all for 1000 to a guy at the local market 2 WORD 1 Kid Type here WORD 2 Stuff Type here By Air Mail Par Avion

1 Compare and contrast what happens to a Gram positive bacterial cell in a hypotonic environment with what happens to a human cell placed in a hypotonic environment If there are any major differences please explain why

8 An important part of the definition of a catalyst is A It must be a reactant in the reaction B It must be made of biological macromolecules C It must increase the activation energy barrier D It must raise the energy level of the products E It must speed up the chemical reaction 9 One difference between a Gram positive cell wall and a Gram negative cell wall is A The Gram negative cell has more DNA B The Gram negative cell has more endospores C The Gram negative cell is more susceptible to penicillin D The Gram positive cell has a thicker layer of peptidoglycan E The Gram positive cell has linear chromosomes instead of circular ones

1 Ethanol has a normal boiling point of 78 3 C and a standard heat of vaporization AH vap of 38 6 kJ mol What is the vapor pressure of ethanol at 45 0 C B 0 57 atm D 0 91 atm A 0 25 atm C 0 87 atm

4 a How is the Lewis structure different from molecular and electron domain geometry Illustrate this by using a water molecule as an example 4 b In an experiment 5 00 g magnesium and 5 00 g oxygen gas are placed in a reaction vessel to form magnesium oxide Which is the limiting reagent and which is the excess reagent How much in grams of the excess reagent remains after the reaction

a Using Fischer Projections draw all of the isomers including stereoisomers of C4H9Br b Using the IUPAC system of nomenclature name all of the molecules that you draw c Draw a circle around ALL the isomer s that are optically active

aluate the decrease in 195 perature when 0 001 a 200 C is compressed Kevin

3 Determine the empirical formula of a binary ionic compound that is found to be 22 71 magnesium and 77 29 chlorine by mass SHOW YOUR WORK

while its temper remains constant 62 0 Mers b 63 0 liters c 60 5 ters d 02 5 ters 5A sample of Oxygen gas occupies a volume of 250 ml at 740 torr pressure What volume will it occupy at En ressure Which law would you use to solve this problem A Boyle s Law b Charles Law e Gay Lussacs Law d B and C

a Consider CH3COONH4 What is the solution pH if this compound is dissolved in it Given the Ka of NH4 is 5 6x10 10 and Ka of CH3COOH is 1 8x10 5 Show through Clear and step by step calculation 4 marks

De Select one A B C D he reaction The total combined mass of A and B is 82 0 grams The mass of D is 51 0 grams What is the mass of C O 51 0 g O 31 0 g O 42 0 g O133 0 g

1 Select one a combustion of methane CH4 02 CO H O Which series of numbers represents the coefficients necessary to balance the equation O 1 2 1 2 O 1 1 1 2 equation below shows the O 0 3 2 2 O 2 2 1 4

Use the quantities below as necessary How many kJ of energy would be required to bring 3 50 kg of solic ice from 56 0 C to the gas phase at standard pressure Ice molar heat capacity 36 5 J mol K Ice heat of fusion 6 02 kJ mol Water molar heat capacity 75 3 J mol K Water heat of vaporization 40 7 kJ mol

Diethyl ether C4H10O has a heat of fusion of 7 27 kJ mol How many joules of energy will be released by 18 9 grams of diethyl ether freezing

4 What is the concentration of nitrate ions in 40 0 mL of a 0 25 M solution of copper II nitrate A 0 010 M B 0 020 M C 0 050 M D 0 50 M

What mRNA base sequences are complementary to the following DNA template sequences Be sure to label the 5 and 3 ends of the complementary sequences a 5 CAT GCT CTA CAG 3 b 3 TAT TAG CGA CCG 5

25 36 How are replication transcription and translation simi lar How are they different 25 2 na ween gene and chromosom major components of matin

hat is the primary purpose of this document Who is the intended audience

23 88 Dietary guidelines suggest we limit our intake of but ter due to the cholesterol content and substitute oils or margarine The table below shows the major fatty acid distribution for a typical stick of margarine and also for butter Values are percentages Myrstic Palmitic Stearic Acid Acid Sample C14 0 C 18 0 Margarine 0 7 7 0 Butter 12 Acid C16 0 14 1 31 11 Oleic Acid C18 1 60 7 24 Linoleic Acid C18 2 17 0 3 a Which contains more monounsaturated fatty acids b Which contains more polyunsaturated fatty acids c Which is likely to contain fewer trans fatty acids Butter and Its Substitutes p 740

3 51 Draw the structures of all products you would obtain by saponification of the following lipid with aqueous KOH What are the names of the products i CH OC CH 16CH3 i HH TT CHOC CH C C CH CH3 H H H H H H 11 CHOCICH Y C CCH C SCH C CCH CH

23 52 Draw the structure of the product you would obtain on complete hydrogenation of the triacylglycerol in Problem 23 51 What is its name Does it have a higher or lower melting temperature than the original triacylglycerol

The solubility of BaCO3 is 4 01 x 10 5 mol L Calculate the solubility product Ksp Remember to use an exponent in the form 4 01x10 5