Chemistry concepts and calculations

1. Which of the following aqueous solutions are good buffer systems? . 0.36 M po

1. Which of the following aqueous solutions are good buffer systems? . 0.36 M potassium iodide + 0.23 M potassium bromide 0.29 M ammonia + 0.35 M ammonium bromide 0.15 M acetic ac…

1. Which of the following aqueous solutions are good buffer systems? .21 M hydro

1. Which of the following aqueous solutions are good buffer systems? .21 M hydrochloric acid + .18 M sodium chloride .32 M hypochlorous acid + .22 M potassium hypochlorite .26 M a…

1. Which of the following aqueous solutions are good buffer systems? 0.24 M hydr

1. Which of the following aqueous solutions are good buffer systems? 0.24 M hydrobromic acid + 0.21 M potassium bromide 0.33 M ammonium bromide + 0.37 M ammonia 0.39 M hydrocyanic…

1. Which of the following are equivalent to a concentration of 1 Molar? 1 mol in

1. Which of the following are equivalent to a concentration of 1 Molar? 1 mol in 100 mL 1% (weight per volume) 58.44 g of NaCl (molecular weight = 58.44) dissolved in water to giv…

1. Which of the following are true of the 20 common amino acids? Pick ALL that a

1. Which of the following are true of the 20 common amino acids? Pick ALL that apply A) They all have the same carboxylic acid group B) They all have the same R group C) They are …

1. Which of the following are true of the 20 common amino acids? Pick ALL that a

1. Which of the following are true of the 20 common amino acids? Pick ALL that apply A) They all have the same carboxylic acid group B) They all have the same R group C) They are …

1. Which of the following atoms would be expected to have the largest radius? O

1. Which of the following atoms would be expected to have the largest radius? O Li C B Ne 2. Which of the following atoms has 6 valence electrons? C F Ne S He 3. Which of the foll…

1. Which of the following balanced molecular equations represent reactions for w

1. Which of the following balanced molecular equations represent reactions for which the rate law expression could likely be determined via time to turbidity determinations? Selec…

1. Which of the following bases can deprotonate a terminal alkyne completely (K

1. Which of the following bases can deprotonate a terminal alkyne completely (K > 105)? a. NaH b. KOH c. H20 e. KOPh 2. Which of the following sets of reagents can be applied t…

1. Which of the following combinations will give an ionic compound with the high

1. Which of the following combinations will give an ionic compound with the highest melting point? A) calcium and fluorine B) potassium and fluorine C) barium and fluorine D) cesi…

1. Which of the following compounds did we use as a pH indicator in class? 2. Wh

1. Which of the following compounds did we use as a pH indicator in class? 2. Which of the following measurements represents an acidic pH? c) 10 d) 13 3. Complete the following eq…

1. Which of the following compounds does not have an alpha hydrogen? B) 11 A) I

1. Which of the following compounds does not have an alpha hydrogen? B) 11 A) I of the above C) III D) IV E) all 2. Which of the labeled hydrogen atoms in the following structure …

1. Which of the following compounds give a positive bromine test (disappearance

1. Which of the following compounds give a positive bromine test (disappearance of red)? a. pentane b. 1-petene c. hexane d. 2-hexene 2. A student prepares cyclohexene from cycloh…

1. Which of the following compounds has physical and chemical properties similar

1.     Which of the following compounds has physical and chemical properties similar to the element sodium? A) NaCl B) NaClO3 C) Na2CO3 D) all of the above E) none of the above 2-…

1. Which of the following compounds has the most electronegative carbon atom (s)

1. Which of the following compounds has the most electronegative carbon atom (s)? A. ethane B. ethane C. Propyne D, benzene 2. Which of the following compounds has the strongest C…

1. Which of the following compounds would be expected to be the MOST soluble in

1. Which of the following compounds would be expected to be the MOST soluble in water? A. Acetic Acid B. Pentanone C. Butanol D. Ethylene 2. How many carbon atoms are in formic ac…

1. Which of the following compounds would show a very large, broad absorption pe

1. Which of the following compounds would show a very large, broad absorption peak at around 3300 cm^-1 in the IR Spectrum A CH3CCCH3 B butane C 1-butene D CH3CH2OCH3 E CH3CH2CH2O…

1. Which of the following compounds, based upon their chemical formulas, would y

1. Which of the following compounds, based upon their chemical formulas, would you expect to show no conductivity? 2. Solution A, an aqueous ionic solution which contains one cati…

1. Which of the following correctly defines the principles of kinetic molecular

1. Which of the following correctly defines the principles of kinetic molecular theory? d. When particles collide, they become motionless. 2. The story about the author as a boy, …

1. Which of the following could act as a Lewis base? A. H 2 O B. PCl 3 C. Lu 3+

1. Which of the following could act as a Lewis base? A. H2O B. PCl3 C. Lu3+ D. FeCl3 E. Both (a) and (b) are Lewis bases 2. For Cu and CH4, which will behave as a Lewis acid towar…

1. Which of the following could be used to monitor the rate of the reaction? (1

1. Which of the following could be used to monitor the rate of the reaction? (1 point) a. change in time/ change in concentration b. change in mass/ change in concentration c. cha…

1. Which of the following describe a chemical change, and which a physical chang

1.         Which of the following describe a chemical change, and which a physical change? a)Sheep are sheared, and the wool is spun into yarn. b)A cake is baked from a mixture of…

1. Which of the following describes Dalton\'s Law? A) The pressure of a gas is p

1. Which of the following describes Dalton's Law? A) The pressure of a gas is proportional to its volume B) Only one variable can be changed from an initial state to a final state…

1. Which of the following describes the compound NiI 2 ? Choose all answers that

1. Which of the following describes the compound NiI2? Choose all answers that apply. The compound is ionic. The compound would conduct electricity if molten. The compound is mole…

1. Which of the following describes the element Cs . Choose all that apply. a.co

1. Which of the following describes the element Cs. Choose all that apply. a.consists of diatomic molecules in elemental form b.is found in nature only combined with other element…

1. Which of the following descriptions best matches the sequence of events that

1. Which of the following descriptions best matches the sequence of events that occurs in the reaction below a)an H abstraction by a base, followed by an intramolecular SN2 b)an i…

1. Which of the following does NOT increase the rate of a chemical reaction? A.

1. Which of the following does NOT increase the rate of a chemical reaction? A. add an allosteric activator B. increase the affinity of the enzyme for the substrate C. increase th…

1. Which of the following electonic transitions in a hydrogen atom emits energy?

1. Which of the following electonic transitions in a hydrogen atom emits energy? a. n=3 to n=4 , b. n=1 to n=4, c. n=4 to n=2 2. Which is not a set of quantum numbers? a. n=1, l=0…

1. Which of the following factors or conditions stabilize the folded state of a

1. Which of the following factors or conditions stabilize the folded state of a protein? Please consider a "typical protein" (not an exception to the rule which do exist in biolog…

1. Which of the following generally indicates the possibility of a chemical chan

1. Which of the following generally indicates the possibility of a chemical change? i. Color change ii. Formation of a solid iii. Formation of a gas iv. Absorption or release of h…

1. Which of the following ground-state electron configurations corresponds to an

1. Which of the following ground-state electron configurations corresponds to an atom that has the most negative value of the electron affinity? A.1s22s22p63s23p63d54s2 B.1s22s22p…

1. Which of the following half-reactions is involved in the STANDARD HYDROGEN EL

1. Which of the following half-reactions is involved in the STANDARD HYDROGEN ELECTRODE? a. Pt2+(aq) + 2e- à Pt(s) b. 2H3O+(aq) + 2e- à 2H2O(l) + H2(g) c. H2O2(aq) + 2H3O+(aq) + 2…

1. Which of the following has an empirical formula that is different than its mo

1. Which of the following has an empirical formula that is different than its molecular formula? A) C5H7O3 B) C3H6N3 C) CH2S D) C2H7N3 2. What is the mass in kilograms of a 250 mL…

1. Which of the following has the same number of significant figures as the numb

1. Which of the following has the same number of significant figures as the number 1.00310? 2. The quantity m is the same as 3 km. 3. One edge of a cube is measured and found to b…

1. Which of the following has the strongest C---O bond? A) CO B) CO2 C) CO3^2- D

1. Which of the following has the strongest C---O bond? A) CO B) CO2 C) CO3^2- D) all three have approximately the same C---O bond dissociation energy. 2. For a given arrangement …

1. Which of the following ionic isotopes has the same number of neutrons and ele

1. Which of the following ionic isotopes has the same number of neutrons and electrons? a)75Br-1 b)77Y+1 c)25Al+3 d)33Zn+3 2.I would like to add carpet to all the floors in my hou…

1. Which of the following is FALSE regarding energy cycling? a. Autotrophs conve

1. Which of the following is FALSE regarding energy cycling? a. Autotrophs convert light energy to chemical energy b. Photosynthetic organisms do not rely on any products of heter…

1. Which of the following is NOT a valid definition of an acid?(10 points) (A) A

1. Which of the following is NOT a valid definition of an acid?(10 points) (A) An electron pair acceptor (B) A substance that lowers the pOH of a solution (C) A proton donor (D) A…

1. Which of the following is a fission reaction? a. 235 U + 1 n 139 Ba + 94 Kr +

1. Which of the following is a fission reaction? a. 235U        +     1n          139Ba     +     94Kr      +    3 1n b. 2H       +        3H              4He      +        1n c. …

1. Which of the following is a reaction for a strong acid? a) 3Ca 2+ (aq) +2PO 4

1. Which of the following is a reaction for a strong acid? a) 3Ca2+(aq)+2PO42-(aq) <-- --> Ca3(PO4)2(s) b) Mg(OH)2(s) --> Mg2+(aq) + 2 -OH(aq) c) CH3CO2H(aq) +H2O(l) <…

1. Which of the following is an electrolyte? a. AgCl b. C&H120; c. Cu(OH)2 d. Mg

1. Which of the following is an electrolyte? a. AgCl b. C&H120; c. Cu(OH)2 d. MgBr2 2. Which of the following is a weak base? a. H2CO3 b. HCI c. Ca(OH)2 d. NH3 3. What is the …

1. Which of the following is false about NMR (Nuclear Magnetic Resonance)? A. Th

1.     Which of the following is false about NMR (Nuclear Magnetic Resonance)? A.     The energy required to flip the spin of a proton is in the microwave region of the electromag…

1. Which of the following is false regarding metabolism? a. in metabolism, food

1. Which of the following is false regarding metabolism? a. in metabolism, food is oxidized. b. Metabolism is a fast process requiring only a few steps. c. During metabolism, ener…

1. Which of the following is generally true of organic compounds? a. they are ty

1. Which of the following is generally true of organic compounds? a. they are typically high melting solids c. both a and b d. neither a and b b, most are soluble in water 2. Whic…

1. Which of the following is not a valid set of quantum numbers? n = 1, l = 0, m

1.Which of the following is not a valid set of quantum numbers? n = 1, l = 0, ml = 0, ms = +1/2 n = 3, l = 1, ml = -1, ms = -1/2 n = 9, l = 4, ml = -3, ms = +1/2 n = 6, l = 5, ml …

1. Which of the following is not an eicosanoids? a. prostaglandins b. leukotrien

1. Which of the following is not an eicosanoids? a. prostaglandins b. leukotrienes c. thromoboxanes d. steroids 2. Hemoglobin and glycoproteins are 2 examples of proteins that con…

1. Which of the following is not involved in the citric acid cycle? Select one:

1. Which of the following is not involved in the citric acid cycle? Select one: a. oxaloacetate b. citrulline c. alpha keto glutarate d. succinyl-CoA e. CoASH 2. All the decarboxy…

1. Which of the following is not true of transition-state analogues? a) They mim

1. Which of the following is not true of transition-state analogues? a) They mimic the transition state of an enzyme-catalysed reaction. b) They react irreversibly with the enzyme…

1. Which of the following is the major product formed after 1-methylcyclopentene

1. Which of the following is the major product formed after 1-methylcyclopentene undergoes acid-catalyzed hydration? A) Compound A B) Compound B C) Compound C D) Compound D 2. Whi…

1. Which of the following is the output generated by the first print statement i

1. Which of the following is the output generated by the first print statement in the code segment above? A. a: 7 C. a: 9 B. a: 8 D. None of the above. 2. Which of the following i…