Chemistry concepts and calculations
117302 questions • Page 81 / 2347
1) http://www.computerworld.com/article/2470905/cloud-computing/want-a-social-en
1) http://www.computerworld.com/article/2470905/cloud-computing/want-a-social-enterprise--you-d-better-be-in-the-cloud-.html According to this article about social enterprise, is …
1) identify the conjugate acid-base pairs a). H 2 PO 4 - (aq) +CO 3 2- (aq) --->
1) identify the conjugate acid-base pairs a). H2PO4- (aq) +CO32- (aq) --->HCO3-(aq) +HPO42- (aq) <--- b)H2O (l) + SO32-(aq)---&…
1) if an insufficent amt of liquid unknown had beenused, how would this have aff
1) if an insufficent amt of liquid unknown had beenused, how would this have affected the value of the experimentalmolar mass. 2) what are the major sourcec of error in your deter…
1) if the following redox reactions are found to occurspontaneously, identify th
1) if the following redox reactions are found to occurspontaneously, identify the more active metal in eachreaction. REACTION …
1) if the same experiment had to be done using an indicator phenolphthalein (cha
1) if the same experiment had to be done using an indicator phenolphthalein (changes color at pH= 8-10) or bromocresol green (pH=3-5), which one should you use and why? 2) where w…
1) if the temperature of 100mL of water rises from 25.0 C to 32.0 C, how much he
1) if the temperature of 100mL of water rises from 25.0 C to 32.0 C, how much heat was added? Assume the density of water is 1.00g/mL and specific heat capacity of the water is 4.…
1) in an experiment, a student was asked to measure the density of an unknown li
1) in an experiment, a student was asked to measure the density of an unknown liquid. He was given a small flask, which he found to have a mass of 32.6195 grams when empty. He fil…
1) in procedure B, if the crucible containing the unknown isnot heated long enou
1) in procedure B, if the crucible containing the unknown isnot heated long enough, what will be the effect on the calculatedpercent water in the unknown( larger or smaller)?expla…
1) in procedure B, if the empty crucible is not heated longenough to completely
1) in procedure B, if the empty crucible is not heated longenough to completely dry it prior to weighing, what will be theeffect on the calculated percent water in the unknown( la…
1) in the first trial of part A of the procedure, the ratio ofmoles H20/moles CA
1) in the first trial of part A of the procedure, the ratio ofmoles H20/moles CASO4 is found to be 1.93. in the second trial theratio was found to be 1.98. calculate the relative …
1) left buret... 2) Right buter 3) A student poured 0.358 g of KHC 8 H 4 O 4 int
1) left buret... 2) Right buter 3) A student poured 0.358 g of KHC8H4O4 into the erlenmeyer flask. After adding some NaOH, the student reached the light pink endpoint. Based on th…
1) magnesium and sulfur Express your answer as a chemical formula. 2) barium and
1) magnesium and sulfur Express your answer as a chemical formula. 2) barium and fluorine Express your answer as a chemical formula. 3) strontium and oxygen Express your answer as…
1) magnesium and sulfur Express your answer as a chemical formula. 2) barium and
1) magnesium and sulfur Express your answer as a chemical formula. 2) barium and fluorine Express your answer as a chemical formula. 3) strontium and oxygen Express your answer as…
1) mass of F / mass of Mg = same for all samples mass of F in sample 2 / mass of
1) mass of F / mass of Mg = same for all samples mass of F in sample 2 / mass of Mg in sample 2 = mass of F in sample 1 / mass of Mg in sample 1 mass of F in sample 2 / 1.36 = 2.5…
1) name 2 scientific scales that are base 10 logarithmic (not natural logarithm-
1) name 2 scientific scales that are base 10 logarithmic (not natural logarithm-ln) that are not pH or pOH 2) Hydrochloric acid is typically sold as a 37.0% solution by weight (37…
1) name 2 scientific scales that are base 10 logarithmic (not natural logarithm-
1) name 2 scientific scales that are base 10 logarithmic (not natural logarithm-ln) that are not pH or pOH 2) Hydrochloric acid is typically sold as a 37.0% solution by weight (37…
1) one way to determine if a relationship is inverse or direct is to find a prop
1) one way to determine if a relationship is inverse or direct is to find a proportionality constant k from the data. if this relationship is direct k =P÷T if it is inverse k =P.T…
1) pH + pOH = 14 13 + pOH = 14 pOH = 1 pOH = -log(OH-) = 1 [OH-] = 0.1M Since H2
1) pH + pOH = 14 13 + pOH = 14 pOH = 1 pOH = -log(OH-) = 1 [OH-] = 0.1M Since H2SO4 is a di-protic acid, so the reaction will be 2NaOH + H2SO4 ------ Na2SO4 + 2H2O Assuming 1L of …
1) phenol (C6H5OH) is a weak acid. The pH of a 0.010M solution of sodium phenola
1) phenol (C6H5OH) is a weak acid. The pH of a 0.010M solution of sodium phenolate (NaOC6H5) is 11.00. What is the acid ionization constant of phenol? 2) A solution of 0.23 mol of…
1) predict the structures of the following ions, and state thehybridization of t
1) predict the structures of the following ions, and state thehybridization of the central atom ion structure …
1) production of lead from the ore galena,pbs, involoves several steps. In the f
1) production of lead from the ore galena,pbs, involoves several steps. In the first step's overall reaction, Pbs is oxidized to PbO and SO2 by (O2)i.e., 2PbS + 3O2 --> 2PbO + …
1) reduction half reaction as follows PbO2 ---------------> Pb +2 Pb changes fro
1) reduction half reaction as follows PbO2 ---------------> Pb+2 Pb changes from +4 to +2 state which indicate reduction. balance the O atom PbO2 ---------------> Pb+2 + 2H2…
1) say, for example, that you had prepared a Buffer C, in which you mixed 8.203g
1) say, for example, that you had prepared a Buffer C, in which you mixed 8.203g of sodium acetate, NaC2H3O2,with 100.0 mL of 1.0 M acetic acid. 1a) if you add 5.0 mL of 0.5M NaOH…
1) short answer question a- H2SO4 is a monoprotic , diprotic or triprotic acid (
1) short answer question a- H2SO4 is a monoprotic , diprotic or triprotic acid ( CHOOSE ONE) B- The oxidation number of H in NaH is -2,-1 , 0 ,+ 1 , +2 ( CHOOSE ONE) c- the halog…
1) show by mathematical equations how one can determine themolar mass of a volat
1) show by mathematical equations how one can determine themolar mass of a volatile liquid by measurement of the pressure,volume, temperature, and mass of the liquid. 2) if 0.80 g…
1) show that boyle\'s law, charles\'s law, and avogado\'s law canbe derived from
1) show that boyle's law, charles's law, and avogado's law canbe derived from the ideal-gas law. 2) methane burns in oxygen to produce CO2 and H20 CH4(g)+ …
1) some substances expierence a chemical rxn when mixed. What is the evidence fr
1) some substances expierence a chemical rxn when mixed. What is the evidence from your observations that a chemical rxn took place? 2) Some substances have acidic or basic proper…
1) sulfuric acid reacts with the ammonia according to the equation below. It tak
1) sulfuric acid reacts with the ammonia according to the equation below. It takes 32.89 mL of a 1.50 M solution of sulfuric acid to neutralize 64.7 mL of ammonia solution. what i…
1) the heat of vaporization of a material is ___________ a) associated with the
1) the heat of vaporization of a material is ___________ a) associated with the energy required for the substance to melt b) associated with the energy required to boil the substa…
1) the velocity of a gas does not depend on -temperature - pressure -molar mass
1) the velocity of a gas does not depend on -temperature - pressure -molar mass -all of the above 2)which statement is not true of an ideal gas? -it conforms of the ideal gas law …
1) use the integrated form of the rate law for a second order reaction to determ
1) use the integrated form of the rate law for a second order reaction to determine the concentration at the 6 minute mark of a reactant that started at 0.900M and proceeded for 6…
1) what do you expect is the effect of concentration? do you expect the conducti
1) what do you expect is the effect of concentration? do you expect the conductivity to a) go up with increasing concentration b) go down with increasing concentration c) stay the…
1) what is the % yield of the crude and the recrystallized aspirin ? 2) Should t
1) what is the % yield of the crude and the recrystallized aspirin ? 2) Should the melting point of the recrystallized aspirin be higher or lower than that of the crude aspirin ? …
1) what is the majoradvantage of using steam distillation as opposed to regulard
1) what is the majoradvantage of using steam distillation as opposed to regulardistillation to isolate organic compounds? 2) in this experiment(steam distillation of t…
1) what is the moler consentration of a salutioncontaining 10g/L of (a) NaOH, (b
1) what is the moler consentration of a salutioncontaining 10g/L of (a) NaOH, (b)Na2SO4, (c)K2Cr2O7 ,(d) KCL? 2) Awater sample contains 44 mg/L of calciumion and 19 mg/Lof…
1) what is the objective of this expermint ? ( name of the experminet density) A
1) what is the objective of this expermint ? ( name of the experminet density) A) All are correct B) to use the chemical statistic 'averge devitaion' C) to calculate the density o…
1) what is the relationship between specific rotations of (2R,3S)-2,3-dichlorope
1) what is the relationship between specific rotations of (2R,3S)-2,3-dichloropentane and (2S,3R)-2,3-dichloropentane? 2) what is the relationship between specific rotations of (2…
1) what is the safety precaution associated with handling thecrucible, clay tria
1) what is the safety precaution associated with handling thecrucible, clay triangle, and tripod? 2) at the beginning of the produce, why must the crucible becleaned before weighi…
1) what volume will 300 ml of gas at 20 C and a pressure of355 mmHg occupy if th
1) what volume will 300 ml of gas at 20 C and a pressure of355 mmHg occupy if the temperature is reduced to -80C and thepressure increased to 760mmHg? 2) a sample of gas of mass 2…
1) what volume will 500ml of gas @ 20oc and a pressureof 420 mmhg occupy if the
1) what volume will 500ml of gas @ 20oc and a pressureof 420 mmhg occupy if the temperature is reduced to 80oc and thepressure to 650 mmhg 2)A sample of gas of mass 2.82 g occupie…
1) when 5.00 mol of benzene is vaporized at a constant pressure of 1.00 atm and
1) when 5.00 mol of benzene is vaporized at a constant pressure of 1.00 atm and its normal boiling point of 80.1 C 169.5kJ are absorbed and P X delta V the vaporization process is…
1) when a 3.25 g sample of solid sodium hydroxide wasdissolved in a calorimeter
1) when a 3.25 g sample of solid sodium hydroxide wasdissolved in a calorimeter in 100.0 g of water, the temperaturerose from 23.9 C to 32 C. calculate H ( in kj/mol NaOH) forthe …
1) which compound is capable of undergoing both SN1 & SN2 reaction in ordinary n
1) which compound is capable of undergoing both SN1 & SN2 reaction in ordinary nonacidic solvents? 2)Which is the best sequence of reactions for the following transformation? …
1) which element is most likely to be found uncombined in nature? a) Kr b) Cr c)
1) which element is most likely to be found uncombined in nature? a) Kr b) Cr c)Br d) Sr 2) as the Ca atom becomes Ca+2 ion the atom _________? a) gained two protons b) gained two…
1) which of the following is FALSE? Restriction enzymes: A) function in the defe
1) which of the following is FALSE? Restriction enzymes: A) function in the defence of bacteria against viral nucleic acid B)recognize and cut DNA at palindromic recognition seque…
1) which of the following species has the greatest entropy (S 0 ) at 25 0 C? exp
1) which of the following species has the greatest entropy (S0) at 250C? explain why you chose the answer. a) SiO2 (s) b) N2O4 (g) c) NO2 (g) d) CH3OH (l) e) He (g) What is the ov…
1) which of the following statements is true? (see above picture) 2) which one o
1) which of the following statements is true? (see above picture) 2) which one of the following is always positive when a spontaneous process occurs? (see above picture) 3) which …
1) which of the oxide would be expected to be thermallyunstable and deompose acc
1) which of the oxide would be expected to be thermallyunstable and deompose according to the equation 2MO >2M+O2 2) Sodium is slightly less reactive than calcium.predict the o…
1) why is there only a less than inequality operator in standard MIPS? 2) What w
1) why is there only a less than inequality operator in standard MIPS? 2) What would be the C Programming equivalent name for what we call an immediate in MIPS? 3) Why is there no…
1) will silver iodide precipitate from a solution that is 0.0045 M AgNO3 0.15 M
1) will silver iodide precipitate from a solution that is 0.0045 M AgNO3 0.15 M NaI, and 0.20 M KCN? 2) Describe how to check a solution for completeness of precipitation 3) A sol…
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