Chemistry concepts and calculations

1) Which of the following processes will result in an increase of entropy of the

1) Which of the following processes will result in an increase of entropy of the system? H2O (g) H2O (l) 2) Which of the following combinations of H and S describe a process that …

1) Which of the following reactions always proceeds ONLY by an E2 mechanism A) D

1) Which of the following reactions always proceeds ONLY by an E2 mechanism A) Dehydrohalogenation B) Deydration C) Free-radical substitution D) Hydration E) Dehalogenation 2) Whi…

1) Which of the following reactions would result in formation of a carboxylic ac

1) Which of the following reactions would result in formation of a carboxylic acid? a)       B and   D b)       D   only c)       A only d)       A,   B,   and   D 2)   How many d…

1) Which of the following reactions would result in formation of an alcohol? a)

1) Which of the following reactions would result in formation of an alcohol? a)       A and   B only b)       D only c)       A only d)       None   of   the   above 2) The scheme…

1) Which of the following represent a balanced equation? Pb(NO 3 ) 2 + Na 2 CO 3

1)Which of the following represent a balanced equation? Pb(NO3)2 + Na2CO3   --> PbCO3   + NaNO3 How many grams of SO2 can be produced in 500.4 g of S8 are combusted in an exces…

1) Which of the following solutions is a buffer? a) 0.10 M CH3COOH and 0.10 M CH

1) Which of the following solutions is a buffer? a) 0.10 M CH3COOH and 0.10 M CH3COONa, (b) 0.10 M CH3COOH, (c) 0.10 M HCl and 0,10 M NaCl, (d) both a and c, (e) all of a, b, and …

1) Which of the following statement is incorrect about gas chromatography? a) GC

1) Which of the following statement is incorrect about gas chromatography? a) GC is useful for separating non-polar volatile compounds. b) GC is not suitable for separating those …

1) Which of the following statements is TRUE? A) Intermolecular forces are gener

1) Which of the following statements is TRUE? A) Intermolecular forces are generally stronger than bonding forces. B) The potential energy of molecules decrease as they get closer…

1) Which of the following statements is TRUE? A) Water and H2S have the same bon

1) Which of the following statements is TRUE? A) Water and H2S have the same bond angles. B) Sulfuric acid is not a pollutant. C) Sulfur is a stronger oxidizing agent than oxygen.…

1) Which of the following statements is consistent with the structure of the Kcs

1) Which of the following statements is consistent with the structure of the KcsA K+ channel? a) This protein is a homotetramer composed of hydrophobic alpha helices that form a c…

1) Which of the following synthetic routes could be used to generate molecule 2

1) Which of the following synthetic routes could be used to generate molecule 2 from molecule 1? a)   HCl   then   H2/Pd   Catalyst b)   Ozonolysis   then   NaBH4 then   SOCl2 c) …

1) Which of the following tags creates bold text? A. B. C. D.

1)    Which of the following tags creates bold text? A.    <B> B.    <BD> C.    <BL> D.   <BR> 2)    Which of the following tags creates italicized text? A…

1) Which of the following would give the most precise volume measurement? a) A 1

1) Which of the following would give the most precise volume measurement? a) A 10mL graduated cylinder with markings every 1mL b) A 10mL Pipet markings every 0.1 mL c) A 50 mL Bur…

1) Which of the following would have the highest surface tension? a molecule wit

1) Which of the following would have the highest surface tension? a molecule with very strong intermolecular forces a molecule with very weak intermolecular forces c.a molecule wi…

1) Which of the ions Mg 2+ , Sr 2+ , Ca 2+ , Be 2+ , Ba 2+ , or Ra 2+ is the lar

1) Which of the ions Mg2+, Sr2+, Ca2+, Be2+, Ba2+, or Ra2+ is the largest? 2) Lattice Energy The following compounds all display the NaCl structure. (i.e. They are isomorphous.) F…

1) Which one of the following subshells (also called sublevels) has the lowest e

1) Which one of the following subshells (also called sublevels) has the lowest energy? (a) 3p (b) 4f (c) 3d (d) 4s 2) Which one of the following subshells (also called sublevels) …

1) Which one(s) is/are likely to be the most practical? 2) Which one might be th

1) Which one(s) is/are likely to be the most practical? 2) Which one might be the most cost effective? Acetic acid reacts with isopentyl alcohol to form banana oil (isopentyl acct…

1) Which orbital corresponds with n = 3, l = 1, ml = 2? 2) An alkaline earth met

1) Which orbital corresponds with n = 3, l = 1, ml = 2? 2) An alkaline earth metal forms a compound with chlorine with the formula __________. a) MCl b) MCl2 c) M2Cl d) MCl3 3) Of…

1) Which organelle is found only in photosynthetic organisms? a) Mitochondrion b

1) Which organelle is found only in photosynthetic organisms? a) Mitochondrion b) Nucleosome c) Chloroplast d) Rough endoplasmic reticulum e) Vesicle 2) Which of the following acc…

1) Which represents the driving force for the boiling of water (i.e. which chang

1) Which represents the driving force for the boiling of water (i.e. which change makes the process occur)? A Neither the change in H and S B The change in S only C Both the chang…

1) Which statement best describes how an enzyme lowers the activation energy of

1) Which statement best describes how an enzyme lowers the activation energy of a reaction? A) the enzyme chemically reacts with the substrate to make it more reactive B) the enzy…

1) Which statement is false? A) The average kinetic energies of molecules from s

1) Which statement is false? A) The average kinetic energies of molecules from samples of different "ideal" gasses is the same at the same temperature. B) The molecules of an idea…

1) Which subshell (for example, 1s) is designated by each set of quantum numbers

1) Which subshell (for example, 1s) is designated by each set of quantum numbers below? 2) How many photons are produced in a laser pulse of 0.202 J at 571 nm? What would be the s…

1) Which substances in the table are strong acids? which are strong bases? 2) Wh

1) Which substances in the table are strong acids? which are strong bases? 2) Which substances in the table are weak acids? which are weak bases? 3) Which substances in the table …

1) Which symbol would be used in a flowchart for the following statement? Displa

1) Which symbol would be used in a flowchart for the following statement? Display sum a) Parallelogram b) Diamond c) Rectangle d) Rounded rectangle 2) Assume that the variables nu…

1) Which three of the following statements accurately describe the blood bufferi

1) Which three of the following statements accurately describe the blood buffering system in humans? The blood buffering system . . . 2) Freediving is an activity in which a perso…

1) Why are NaOH and HCl not used as primary standards for acid–base titrations?

1) Why are NaOH and HCl not used as primary standards for acid–base titrations? What properties should a primary standard possess? 2) In order to standardize a solution of NaOH, 1…

1) Why can tin form two different ions? a) Tin can gain or lose electrons to for

1) Why can tin form two different ions? a) Tin can gain or lose electrons to form an anion or a cation. b) Tin can gain a variable number of electrons to form two or more differen…

1) Why do molecules absorb light? Why are only certain wavelengths absorbed? 2)

1) Why do molecules absorb light? Why are only certain wavelengths absorbed? 2) Shown below is the absorbance spectrum of CBBG in the presence of a large excess of BSA. The x-axis…

1) Why does the spectrometer need to be warmed up for 15 min prior to using? 2)

1) Why does the spectrometer need to be warmed up for 15 min prior to using? 2) Why do cuvettes need to be conditioned? That is, rinsed three times with the solution to be analyze…

1) Why does this reaction provide predominantly the elimination product whereas

1) Why does this reaction provide predominantly the elimination product whereas the reaction performed with the EXACT same alcohol with an acid (HCl) provides predominantly the su…

1) Why is it important to clean up any spills immediately, wash hands frequently

1) Why is it important to clean up any spills immediately, wash hands frequently, and wash glassware thoroughly when working with crystal violet solutions? a) Cyrstal violet is a …

1) Why is it important to clean up any spills immediately, wash hands frequently

1) Why is it important to clean up any spills immediately, wash hands frequently, and wash glassware thoroughly when working with crystal violet solutions? a) Cyrstal violet is a …

1) Why is it important to use the correct salt-sand mix on highways during winte

1) Why is it important to use the correct salt-sand mix on highways during winter storms? 2)a) Why is it important to correctly measure the chemicals used in the water treatment p…

1) Why is it necessary to standardize an NaQH solution? 2) Write the balanced ch

1) Why is it necessary to standardize an NaQH solution? 2) Write the balanced chemical equation for the reaction of NaOH with HCl. ) Look up the molecular weight for potassium hyd…

1) Why is the heat of vaporization of water (40700 Jmol -1 ) so much greater tha

1) Why is the heat of vaporization of water (40700 Jmol-1) so much greater than for nitrogen? 2) Write an equation for the vaproization of nitrogen in warm water. Is the process e…

1) Why is triethylene glycol used instead of ethanol or t-butanol for the solven

1) Why is triethylene glycol used instead of ethanol or t-butanol for the solvent in E-2 reaction from racemic 1,2-dibromo1,2-diphenylethane? 2) Why is sodium alkoxide (NaOR, such…

1) Will a precipiate of PbCl 2 (s) form when various concentrations and volumes

1) Will a precipiate of PbCl2(s) form when various concentrations and volumes of Pb(NO3)2(aq) and HCl(aq) are mixed? PbCl2 Ksp = 1.2 x 105 - 100 mL of 5.0 x 10^-5 M of Pb(NO3)2 an…

1) Would a reaction occur if a piece of metallic Sn wereplaced in distilled wate

1) Would a reaction occur if a piece of metallic Sn wereplaced in distilled water with a piece of metallic Zn? Explain andwrite a net ionic equation 2) Would a reaction occur if a…

1) Would the calculated molarity of the unknown acid solution be higher, lower,

1) Would the calculated molarity of the unknown acid solution be higher, lower, or not affected if each of the following occurred. Explain your answers. a. The buret containing Na…

1) Write Kc expression for the following reaction: Co^(3+)(aq) + 6NH_3 (aq)

1) Write Kc expression for the following reaction: Co^(3+)(aq) + 6NH_3 (aq) <-----> (Co(NH_3)_6)^(3+) (aq) 2)Using the following initial concentrations measured, [Co^(3+)]=3…

1) Write Kc expression for the following reaction: Co^(3+)(aq) + 6NH_3 (aq)

1) Write Kc expression for the following reaction: Co^(3+)(aq) + 6NH_3 (aq) <-----> (Co(NH_3)_6)^(3+) (aq) 2)Using the following initial concentrations measured, [Co^(3+)]=3…

1) Write a C++ program to compute the sum of the digits of a positive number. Pr

1) Write a C++ program to compute the sum of the digits of a positive number. Prompt the user to enter the number. If the user enters a 0 or a negative number, you program should …

1) Write a balanced chemical equation for the overall reaction represented by th

1) Write a balanced chemical equation for the overall reaction represented by the cell notation below. Cr(s) | Cr3+(aq) || Br–(aq) | Br2(g) | Pt(s) 2Cr3+(aq) + 6Br–(aq) ? 2Cr(s) +…

1) Write a balanced equation for the combustion of candle wax? 2) How many many

1) Write a balanced equation for the combustion of candle wax? 2) How many many burned ? 3) From the equation, how many moles of oxygen were consumed in the combustion of candlewa…

1) Write a balanced net ionic equation for the reaction of AgNO 3 (aq) with KI(a

1) Write a balanced net ionic equation for the reaction of AgNO3(aq) with KI(aq) a)AgNO3(aq) + KI(aq) AgI(s) + KNO3(aq) b)Ag+(aq) + I-(aq) AgI(s) c)Ag+(aq) + NO3-(aq) + K+(aq) + I…

1) Write a class called Animal that has a single private instance variable of ty

1) Write a class called Animal that has a single private instance variable of type int that represents the number of legs the animal has. Override the equals method (inherited fro…

1) Write a function named problem1 that accepts two arguments to the beginning a

1) Write a function named problem1 that accepts two arguments to the beginning and end iterators of a container. Return a std::pair whose first value is an iterator to the smalles…

1) Write a function named problem3 that accepts iterators to the beginning and e

1) Write a function named problem3 that accepts iterators to the beginning and end of a range and an element to search for. The function returns the number of steps taken if binar…

1) Write a net ionic equation for the reaction that occurs when aqueous solution

1) Write a net ionic equation for the reaction that occurs when aqueous solutions of potassium cyanide and hydroiodic acid are mixed. 2) Write a net ionic equation for the reactio…