Chemistry concepts and calculations

1) During the synthesis of a Grignard reagent, what is the maximum temperature o

1) During the synthesis of a Grignard reagent, what is the maximum temperature of the reaction mixture before heating under reflux? A) The reaction temperature is the boiling poin…

1) During the work-up procedure of our second reaction (“Hydrogenation of a Chal

1) During the work-up procedure of our second reaction (“Hydrogenation of a Chalcone”), the following steps are performed: a) Add 15 mL of brine and 10 mL of ethyl acetate to the …

1) Each of the following is a testable hypothesis, except a) avoiding contact wi

1) Each of the following is a testable hypothesis, except a) avoiding contact with other people reduces the chance of catching a cold. b) taking zinc lozenges at the first sign of…

1) Each of the statements below attempts to explain why some periodic property v

1) Each of the statements below attempts to explain why some periodic property varies predictably among elements in the periodic table. Determine if each statement is true or fals…

1) Electric potential energy of a system is equal to the a) the kinetic energy o

1) Electric potential energy of a system is equal to the a) the kinetic energy of the system of charges b) work required to bring a system of charges together C) force required to…

1) Electrolytic Cell 2) Cell Potential 3) Oxidation-Reduction Reaction 4) Oxidat

1) Electrolytic Cell 2) Cell Potential 3) Oxidation-Reduction Reaction 4) Oxidation 5) Voltaic Cell 6) Half-Cell 7) Standard Hydrogen Electrode 8) Standard Cell Potential 9) Cell …

1) Elemental S reacts with O2 to form SO3 according to the reaction 2S+3O22SO3 A

1) Elemental S reacts with O2 to form SO3 according to the reaction 2S+3O22SO3 A) How many O2 molecules are needed to react with 3.25 g of S? B) What is the theoretical yield of S…

1) Elements react in order to gain, lose, or share protons. True False 2) Which

1) Elements react in order to gain, lose, or share protons. True False 2) Which unit for temperature must be used when calculating GasLaws? °C °F K 3)For a gas sample with a fixed…

1) End Point- Point in titration at which a reaction is complete. The point duri

1) End Point- Point in titration at which a reaction is complete. The point during a titration when an indicator shows that the amount of reactant necessary for a complete reactio…

1) Energy that is associated with the motion of an object is called A) kinetic e

1) Energy that is associated with the motion of an object is called A) kinetic energy B) thermal energy C) potential energy D) chemical energy 2) Caleulate the change internal ene…

1) Ethane (a component of natural gas) burns according to the equation: 2 C2H6 +

1) Ethane (a component of natural gas) burns according to the equation: 2 C2H6 + 7 O2 4 CO2 + 6 H2O a) If one starts with 1 mole of C2H6, how many moles of oxygen (O2) are require…

1) Ethanol has a Kb of 1.22 Degrees C/m and usually boils at 78.4 Degrees Celciu

1) Ethanol has a Kb of 1.22 Degrees C/m and usually boils at 78.4 Degrees Celcius. How many mol of an nonionizing solute would need to be added to 47.84 g ethanol in order to rais…

1) Ethanol is supplied in a 90% solution. You need 750 ml of 75% ethanol for you

1) Ethanol is supplied in a 90% solution. You need 750 ml of 75% ethanol for your experiment. How would you make this solution? 2) you need to treat cells with aresnite such that …

1) Every step in a Fischer esterification is an equilibrium. How do you drive th

1) Every step in a Fischer esterification is an equilibrium. How do you drive the reaction towards products in this experiment? Fisher Esterification: Synthesis of lsoamyl Acetate…

1) Explain the chemistry of acid mine drainage using a net ionic equation. 2) Ex

1) Explain the chemistry of acid mine drainage using a net ionic equation. 2) Explain why the solubility of some metal compounds will be increased in acidic conditions. Use the NI…

1) Explain the difference between equivalence point and end point... Explain how

1) Explain the difference between equivalence point and end point... Explain how the pH at the equivalence point varies as the strength of the acid increases.... Remember that aci…

1) Explain the relationship between the reliability of a measurement and the ins

1) Explain the relationship between the reliability of a measurement and the instrument used to make the measurement. Check all that apply. 2) How should units be treated in calcu…

1) Explain what happens when NaHCO3 is added to the organic layerby the use of c

1) Explain what happens when NaHCO3 is added to the organic layerby the use of chemical reaction? PLEASE EXPLAIN IN DETAIL thanks HERE IS PROCEDURE OF LAB EXP: I completed a lab e…

1) Explain whether Ch 3 OH is going to be soluble in water in terms of intermole

1) Explain whether Ch3OH is going to be soluble in water in terms of intermolecular forces. 2) Interpret the difference in light intensity between the probe in acetic acid solutio…

1) Explain why a significant excess of sodium borohydride, NaBH 4 is used to red

1) Explain why a significant excess of sodium borohydride, NaBH4 is used to reduce aldehyde compounds containing additional acidic functional groups (e.g. phenols, carboxylic acid…

1) Explain why atoms that are larger in size have lower ionization energies than

1) Explain why atoms that are larger in size have lower ionization energies than smaller atoms ? 2) Suggest an element that would form the follwoing types of bonds with chlorine a…

1) Extraction of an aqueous solution with an immiscible organic solvent is a cru

1) Extraction of an aqueous solution with an immiscible organic solvent is a crucial step in most organic synthetic processes. Based on the overall reaction for this experiment, p…

1) Fe in FeI2 has oxidation state of +2 Fe in Fe has oxidation state of 0 So, re

1) Fe in FeI2 has oxidation state of +2 Fe in Fe has oxidation state of 0 So, reactant reduced = FeI2 Mg in Mg has oxidation state of 0 Mg is MgI2 has oxidation state of +2 So, re…

1) Fill in the blank: Why are lower molecular weight alcohols more soluble in wa

1) Fill in the blank: Why are lower molecular weight alcohols more soluble in water than higher molecular weight alcohols? Alcohols with __________ molecular weights are more wate…

1) Fill in the blanks with either less or more. Consider two acids - HF and NH3.

1) Fill in the blanks with either less or more. Consider two acids - HF and NH3. Fluorine is________ electronegative than N and therefore HF will be__________ acidic than NH3. 2) …

1) Find the oxidation numbers of manganese (Mn) in MnO4-, and of carbon in C2O4H

1) Find the oxidation numbers of manganese (Mn) in MnO4-, and of carbon in C2O4H2 and CO2. Use those oxidation numbers to analyze this reaction. Is MnO4- being oxidized or reduced…

1) Finish the Sentence: When solid lithium hypochlorite is added to water, the p

1) Finish the Sentence: When solid lithium hypochlorite is added to water, the pH _____ a. remains at 7 b. becomes greater than 7 because of hydrolysis of lithium ion c. becomes l…

1) Firefly luciferase is the enzyme that allows fireflies to illuminate their ab

1) Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light generation is an ATP-requiring reaction, firefly luciferase can be used …

1) First construct an initial ER diagram that does not include relations based o

1) First construct an initial ER diagram that does not include relations based on the database requirements provided below. It should only have the Entities and their Attributes. …

1) Following are two diastereomers of 3-bromo-3,4-dimethylhexane . On treatment

1) Following are two diastereomers of 3-bromo-3,4-dimethylhexane. On treatment with sodium ethoxide in ethanol, each gives 3,4-dimethyl-3-hexeneas the major product. One diastereo…

1) For a certain reaction, K c = 9.59×10 4 and k f= 32.6 M 2s1 . Calculate the v

1) For a certain reaction, Kc = 9.59×104 and kf= 32.6 M2s1 . Calculate the value of the reverse rate constant, kr, given that the reverse reaction is of the same molecularity as t…

1) For a given process at constant pressure, w is positive. This means that the

1) For a given process at constant pressure, w is positive. This means that the process involves (I Pts) A) work being done by the system on the surroundings B) work being done by…

1) For all the combinations, fill in the columns Water/ Salt Charcoal lighter fl

1) For all the combinations, fill in the columns Water/ Salt Charcoal lighter fluid/ sugar 2) In obersving the patterns above, what conclusions can be drawn about the combinations…

1) For each of the following determine if the sign of S for the process. A: delt

1) For each of the following determine if the sign of S for the process. A: deltaS + B: deltaS- - O2(g) --> O2(l) - 2NO(g) + O2(g) --> 2 N2O(g) - NaBr(s) --> Na+(aq) + Cl…

1) For each spectral data set, determine the general type (C,CH,CH 2 , or CH 3 )

1) For each spectral data set, determine the general type (C,CH,CH2, or CH3) of each carbon signal. Are there any signals representing more than one carbon? How many degrees of un…

1) For every a and b which are non-const pointers of the same type, you can do a

1) For every a and b which are non-const pointers of the same type, you can do a = b;, right? 2) Inside non-const member functions the this keyword exists, which is a non-const po…

1) For motor proteins the work that can be done is equal to the displacement or

1) For motor proteins the work that can be done is equal to the displacement or powerstroke multiplied by the force against which the motor is working. There are limits to extendi…

1) For recrystallizations, we want the solvent to be as close to the same polari

1) For recrystallizations, we want the solvent to be as close to the same polarity to the desired compound as possible? True or False. 2) Which of the following qualities is not i…

1) For sulfurous acid (H 2 SO 3 , a diprotic acid), write the equilibrium dissoc

1) For sulfurous acid (H2SO3, a diprotic acid), write the equilibrium dissociation reactions and the corresponding expressions for the equilibrium constants, Ka1and Ka2. 2) Write …

1) For the Greener Bromination of Stilbene Laboratory, you use an analytical bal

1) For the Greener Bromination of Stilbene Laboratory, you use an analytical balance to obtain the mass of your solid starting material on a tared piece of pre-folded weighing pap…

1) For the chemical reaction, 2CH 4(g) C 2 H 2(g) + 3H 2(g) , K= 0.165 at175

1) For the chemical reaction, 2CH4(g) <-->C2H2(g) + 3H2(g) , K= 0.165 at1752o C. What is Kp for the reaction at thistemperature? 2) For the reaction, N2(g) + 3H2(g)<--&gt…

1) For the following electrochemical cell Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 1.50

1) For the following electrochemical cell        Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 1.50 M)|Ag(s) write the net cell equation. Calculate the following values using standard potenti…

1) For the following pairs of molecules/atoms, circle the species that has the h

1) For the following pairs of molecules/atoms, circle the species that has the highest boiling point. (5) a. PH3 or NH3 b. HCl or HBr C. Ne or Kr d. CaHs or CH e. H2S or H20 2) Ci…

1) For the following question, assume the pKa of the alpha-carboxyl group = 2.0.

1) For the following question, assume the pKa of the alpha-carboxyl group = 2.0. What would be the charge of the alpha-carboxyl group of glycine at pH 7? 2) For the following ques…

1) For the following reaction, 2.94 grams of methane (CH 4 ) are allowed to reac

1) For the following reaction, 2.94 grams of methane (CH4) are allowed to react with with 32.9 grams of carbon tetrachloride. -------> ANSWER: What is the maximum amount of dic…

1) For the following reaction, 26.9 grams of diphosphorus pentoxide are allowed

1) For the following reaction, 26.9 grams of diphosphorus pentoxide are allowed to react with 9.00 grams of water. diphosphorus pentoxide (s) + water (l)  phosphoric acid(aq) -Wha…

1) For the following reaction, calculate the S rxn at 25 o C given the absolutio

1) For the following reaction, calculate the Srxn at 25oC given the absolution entropies: 2A(g) + B(g) 2C(g) SoA = 30.6 J/molK,  SoB = 128.9 J/molK ,  SoC = 55.8  J/molK 2) For th…

1) For the reaction 2Co3+(aq)+2Cl(aq)2Co2+(aq)+Cl2(g). E=0.483 V what is the cel

1) For the reaction 2Co3+(aq)+2Cl(aq)2Co2+(aq)+Cl2(g). E=0.483 V what is the cell potential at 25 C if the concentrations are[Co3+]= 0.685 M , [Co2+]= 0.417 M , and [Cl]= 7.70×102…

1) For the reaction 5Br - (aq) + BrO 3(aq) + 6H + (aq) ® 3Br 2(aq) + 3H 2 O it w

1)                 For the reaction 5Br-(aq) + BrO3(aq) + 6H+(aq) ® 3Br2(aq) + 3H2O       it was found that at a particular instant bromine was beingformed at the rate of 0.039 mo…

1) For the reaction of the ammonium ion with nitrous acid, the net reaction is N

1) For the reaction of the ammonium ion with nitrous acid, the net reaction is NH4+(aq) + HNO2(aq) N2(g) + 2H2O(l) + H+(aq) If the initial concentration of nitrous acid is 1.00 M …