Qualitative analysis Questions and Answers

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