Chemistry in Daily Life Questions and Answers

54 A levo rotatory compound 2 chloro 2 phenyl butane is undergoing nucleophilic substitution with OH following SN mechanism The product s obtained is are a leavo rotatory 2 phenyl butan 2 ol c 1 1 Mixture of both a and b b Dextro rotatory 2 phenyl butan 2 ol d None of these

For the reaction 2 N O5 4 NO2 O2 rate of reaction is given by 1 d N 05 dt NI 2 2d 05 dt d NO dt hr m d 0 dt

3 SO NO CH3 CH C Br CH CH OH CH CH CH C Br CH CH CHONG CH CH OH Possible products are 4 SO NO CH3CH OH B major A major 2 J 3 SO NO CH3 48 CH3 C Br CH3CH OH CH 3 CH3 1 4 SO NO CH3 C Br 1 CH3 CH3CH ONa CH3CH OH CH3CH OH A R B

Solvelancer Test Some statements are given about lime calcium oxide below 1 Calcium oxide lime is an amorphous white solid 2 It has a high melting point of 2273 K 3 Heating it at a very high temperature produces white light Which statement s is are true among them Solvelancer Test a Only 1 b Both 1 and 2 c Both 2 and 3 d All are correct a

Hydrolysis of ethyl acetate in acidic medium is Fractional order reaction Zero order reaction Pseudo first order reaction hr m Second order reaction

58 A Aryl or alkyl monochloride B How many isomers of A will give B When B is a CH3 CH CH3 CH3 c CH3 CH CH CH3 CH3 For example if abcd each are formed from 3 isomers of A in every case fill 3333 i Mg Reflux ii H30 b CH CH Ph PH d Ph CH CH3

Compound 1 is hard to afford but it is possible to synthesis 1 as shown below CI Rot CN Lok 2 propanol OK HN NH 1 1 What is the proper name of the compound 1 Also what is the name that most commonly appears as a in consumer products

2 An unknown organic molecule of C4H6Cl4 is characterized by having the following chemical shifts 8 3 9 ppm doublet 4H 8 4 6 ppm triplet 2H Identify the structure of the unknown compound show full work

Which among the following is not a synthetic detergent CH CH 10 CH OSO Na CH CH 11 SO a hr mir CH3 CH2 16COO CH CH O CH CH OH

Which of the following practices will not come under green chemistry A If possible making use of soap made of vegetable oils instead of using synthetic detergents B Using H O for bleaching purpose instead of using chlorine based bleaching ager C Using bicycle for traveling small distances instead of using petrol diesel based vehicles D Using plastic cans for neatly preserving substances

Atomic Structure 2 Electronic Structure Question 2 Read the statement lect one A hypothetical ionic compound has the following formula AB2 Which option shows the most likely periodic table groups for the elements A and B O A Group 2 B Group 17 O A Group 2 B Group 18 O A Group 1 B Group 18 OA Group 1 B Group 17

A 1 0L flask contains 2 0 mol of A and no products at 298K Determine the equilibrium concentration of C Given the reaction A g B g 20 g Kc 8 33 10 4 Hint Prepare an ICE table to solve this problem and watch out for coefficients You may assume the change is concentration is negligible small x assumption a 0 094 M Ob 0 24 M Oc 5 6 x 10 M O d 0 15 M O e 0 075 M

If the equilibrium constant Kc for A B 2C is 0 500 What is the equilibrium constant for 2A 2B 4C is O a 0 500 Ob 1 00 Oc 0 707 Od 0 250

rst classify each of the following reactions as one of the five types introduced in this lab ombination decomposition single replacement double replacement or combustion Second write e balanced chemical equation for each reaction H2Oz aq H2O O2 g SO3 g H O 1 Mg s AgNO3 aq C H g O g CO g MgCO3 s MgO s Na O s H O l Na s H O l 2 C3H8O3 1 Br 1 P4 S O g Nal aq Br 1 H SO4 aq Combination Mg NO3 2 aq 2 Ag s Single replacement CO g NaOH aq NaOH aq CO g NaBr aq PBr3 s H O g H g H O g I s

Which dissolves more quickly fine or course NaCl crystals Explain why

Transmittance 4000 3500 3026 41 3000 2919 89 2500 Unknown 5 2000 Wavenumbers cm 1 1603 94 1459 46 1494 40 1500 1029 95 1080 64 1000 02 38

18 Following compound is named as a N N dimethylformamide c N N methylformamide 0 CH C N CH b N N dimethylacetamamidi d N N methylacetamamide

Q 11 The rate of a chemical reaction doubles for every 10 C rise of temperature If the temperature raised by 60 C the rate of the reaction increases by A 16 times B 8 times C 32 times D 64 times E 4 times

What is the pH of a 0 0017 M solution of the strong acid HBr aq 2 8 4 8 6 1 3 5

Draw orbital sketches and build the models for a Ethene ethylene C H4 Each carbon in ethene has 3 regions gray pieces sp2 this molecule is trigonal planar the 3D structure is done with solid lines all in the same plane b Ethyne acethylene C H There is only one triple bond gray with regions above and below the internudear axis The piece already represents the two carbons of the triple bond just add the two hydrogens white spheres The piece without H represents 4 carbons The angles around each carbon are 180

How many electrons does the following ion have 4 129 531

Which of the following subshells are found in the second principle energy level n 2 S

For each of the funding as for svampes Shown 0 H eg E ON i 11 U groups 4 3 400 cm Ho indicate complete V 3 00 1720

To calculate the freezing point of an ideal dilute solution of a single nondissociating solute of a solvent the minimum information one must know is the molality of the solute the molality of the solute and the freezing point depression constant of the solvent the same quantities as in B plus the freezing point of the pure solvent all of the quantities in C plus the molecular weight of the solute all of the quantities in C plus the weight of the solvent

Which of the following statements is FALSE All voltaic galvanic cells involve the use of electricity to initiate non spontaneous chemical reactions Reduction occurs at the cathode All electrochemical reactions involve the transfer of electrons Oxidation and reduction half reactions occur at electrodes in electrochemical cells

1 Draw the structures for each of the alcohols and USE ARIO to rank them in order of these relative acidities Explain how you used ARIO 2 What base can you use to deprotonate each of the alcohols 3 Show how you can use isopropyl alcohol to make a specific ether using the Williamson Ether Synthesis 4 Show how you can use isopropyl alcohol to add to an alkene to make an ether using Mercury Acetate addition reaction

The equilibrium constant for the generic reaction A g 2B g 2C g is Kc 1 2x102 at 400k Calculate the value of Kp O 1 2x102 O 0 35 O 3 7x104

Which of the following are homogeneous mixtures Tomato sauce with meatballs A saline solution The air in this room HCI aq

Which of the following elements are transition metals N F Ca Sn

How many electrons can the n 3 energy level contain Question 54

When a nonvolatile solute is added to a volatile solvent the solution vapor pressure the boiling point and the osmotic pressure across a semipermeable membrane 117 the freezing point decreases increases decreases decreases increases increases decreases increases increases decreases increases decreases decreases decreases increases decreases decreases increases decreases increases

Which solution should have the highest vapor pressure O 0 10 M sucrose C12H22011 0 25 M sucrose C12H22011 0 50 M Sucrose CroHooQul

Polyethylene is a synthetic polymer or plastic with many uses 1 35 g of a polyethylene sample was dissolved in enough benzene to make 100 mL of solution and the osmotic pressure was found to be 1 86 torr at 25 C What is the approximate molar mass of the polyethylene 177 g mol O1 13 x 104 g mol 7 40 10 g mol 1 24 x 105 g mol 1 35 x 105 g mol

CO2 g 393 5 kJ mol H O 1 285 8 kJ mol AH kJ mol An error has been detected in your answer Check for typos miscalculations etc before submitting your answer Submit Answer Review Topics The standard enthalpy of combustion of ethene gas C H g is 1411 1 kJ mol at 298 K Given the following enthalpies of formation calculate AH for C H4 9 Retry Entire Groun 9 more group attem Slee iclas Blackboard T References 2

Question 75 How many valence electrons does Arsenic have Question 76

Which of the following elements are noble gasses CI He Br

What is the abbreviated noble gas configuration for Caesium O Xe 5d1 O Xe 5d10 651 O Xe 651 O kr 6s

What is the boiling point change for a solution containing 0 831 moles of naphthalene a nonvolatile nonionizing compound in 250 g of liquid benzene Kb 2 53 C m for benzene 8 41 C 0 761 C 3 04 C 2 10 C 0 526 C

calcium hydroxide OA 2 2 1 1 OB 1 5 3 2 O C 1 6 3 2 O D 2 1 6 2 QUESTION 5 ammonia OB Calcium chloride calcium nitride Which of the following compounds is insoluble in water OA Sodium chloride water

Draw the line structure for 4 methyl hex 2 yne Explain the steps you ve taken to draw the structure 4 marks

How many protons does the following ion have 129 531

Which of the following statements is TRUE The absorption and emission of light occurs in fixed discrete quantities of energy known as photons Light and matter can t interact because matter does not have a natural frequency The double slit experiment for electrons proved that electrons are particles Absorption is when energy is released from matter in the form of light particles

Classify the following as a Sugar dissolving in hot tea physical physical or chemical change

Predict Will a solution form if potassium nitrate is mixed with NH3 O yes O no

What is the full electron configuration for calcium O1s 2s22p 3s23p64s O1s 2s 2p 3s 3p6 1s22s22p 3s23p 4p 1s22s22p 3s23p64s

What is the starting material for the reaction below Oll 4 11 NaOH III OH IV

The half life of a radioisotope is 2 04 x 103 yr How many years will it take for a 289 g sample to decay until 103 g of the isotope remains Enter your answer as an integer

Which of the following elements would have similar physical and chemical properties AI Co Be B

Is the mass of 129 531 identical to the atomic mass of iodine O no O No answer text provided yes

What pressure in atm will a sample of O2 gas occupy at 100 0 mL if O has a volume of 25 00 mL at 2 0 atm A 4 0 atm OB 2 0 atm OC 0 50 atm OD 125 atm