Chemistry concepts and calculations
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(a) The standard molar enthalpy of formation, Delta Hf_0, for diborane, B2H6 (g)
(a) The standard molar enthalpy of formation, Delta Hf_0, for diborane, B2H6 (g), cannot be directly cause the compound cannot be prepared by the reaction of boron and hydrogen. I…
(a) The total carbon dioxide content (H_2CO_3 + HCO_3^-) in a blood sample is de
(a) The total carbon dioxide content (H_2CO_3 + HCO_3^-) in a blood sample is determined by acidifying the sample and measuring the volume of CO_2 evolved with a Van Slyke manomet…
(a) The volume of an aqueous solution of NaCl at 25 degree C was measured at ser
(a) The volume of an aqueous solution of NaCl at 25 degree C was measured at series of molalities b, and it was found that the volume fitted the expression v = 1003 + 16.62x + 1.7…
(a) To set up a coffee cup calorimeter experiment, we like a substantial tempera
(a) To set up a coffee cup calorimeter experiment, we like a substantial temperature change so that the measurement is accurate, but not too large to avoid the water boiling. In t…
(a) We can use the following relationship for dilution – V1S1 = V2S2, V1=10.0 ml
(a) We can use the following relationship for dilution – V1S1 = V2S2, V1=10.0 ml of KOH and S1= 3.00 M and V2 = 250 ml of KOH, S2=? S2= V1S1/V2 = 10*3/250 = 0.12 M Now, for the ac…
(a) What is the composition, in weight percent, of an alloy that consists of 10
(a) What is the composition, in weight percent, of an alloy that consists of 10 at% Zinc, 8 at% aluminum and 82 at% copper? (b) What is the composition, in atom percent, of an all…
(a) What is the coupling constant between the alkene protons. (b) What does the
(a) What is the coupling constant between the alkene protons. (b) What does the coupling constant tell us about the geometry of the alkene (i.e. how do we know that the alkene is …
(a) What is the magnitude of the gravitational force of attraction between two e
(a) What is the magnitude of the gravitational force of attraction between two electrons separated by a distance r? What is the magnitude of the electrical force of repulsion betw…
(a) What is the mass of water used in this experiment? (b) Calculate the amount
(a) What is the mass of water used in this experiment? (b) Calculate the amount of energy (heat) absorbed by the water. (c) Calculate the heat capacity of the metal. A 48.50 g sam…
(a) What is the maximum number of electrons in an atom that can have the followi
(a) What is the maximum number of electrons in an atom that can have the following quantum numbers? (c) n = 7, l = 6, ml = +5 (d) n = 6, l = 3, ml = -2, ms = +1/2 (b) For each o…
(a) What is the maximum work that can be obtain from 1000J of heat supplied to a
(a) What is the maximum work that can be obtain from 1000J of heat supplied to a steam engine with a high temperature reservoir at 100degrees Celsius if the condenser is at 20 deg…
(a) What is the name of the experiment performed by reading output at detector A
(a) What is the name of the experiment performed by reading output at detector A? Circle all that apply: Absorption Emission Fluorescence Scatter Transmittan…
(a) What is the rate law for this reaction? 1) Rate = k [ClO 2 (aq)] [OH - (aq)]
(a) What is the rate law for this reaction? 1) Rate = k [ClO2(aq)] [OH-(aq)] 2) Rate = k [ClO2(aq)]2 [OH-(aq)] 3) Rate = k [ClO2(aq)] [OH-(aq)]2 4) Rate = k [ClO2(aq)]2 [OH-(a…
(a) What is the rate law for this reaction? Rate = k [HgCl 2 (aq)] [C 2 O 4 2- (
(a) What is the rate law for this reaction? Rate = k [HgCl2(aq)] [C2O42-(aq)] Rate = k [HgCl2(aq)]2 [C2O42-(aq)] Rate = k [HgCl2(aq)] [C2O42-(aq)]2 Rate = k [HgCl2(aq)]2 [C2O…
(a) What is the rate law for this reaction? Rate = k [HgCl 2 (aq)] [C 2 O 4 2- (
(a) What is the rate law for this reaction? Rate = k [HgCl2(aq)] [C2O42-(aq)] Rate = k [HgCl2(aq)]2 [C2O42-(aq)] Rate = k [HgCl2(aq)] [C2O42-(aq)]2 Rate = k [HgCl2(aq)]2 [C2O…
(a) What is the rate law for this reaction? Rate = k [HgCl 2 (aq)] [C 2 O 4 2- (
(a) What is the rate law for this reaction? Rate = k [HgCl2(aq)] [C2O42-(aq)]Rate = k [HgCl2(aq)]2 [C2O42-(aq)] Rate = k [HgCl2(aq)] [C2O42-(aq)]2Rate = k [HgCl2(aq)]2 [C2O42-(…
(a) What is the value of the rate constant? [ ] (b) What are the units of the ra
(a) What is the value of the rate constant? [ ] (b) What are the units of the rate constant? ()M-3s-1 ()M-1s-1 () M-1s-2 ()M-2s-1 ()M3s ()M0s-1 ()M-1 ()The rate constant has n…
(a) What mass of strontium nitrate (Sr(NO3)2) would be required to prepare 1.000
(a) What mass of strontium nitrate (Sr(NO3)2) would be required to prepare 1.000 L of a 0.0190 M aqueous solution of this salt? 9402097X (b) Calculate the mass percent of Sr(NO3)2…
(a) What type of chemical reaction will result when a flammable solvent is mixed
(a) What type of chemical reaction will result when a flammable solvent is mixed with any of the following compounds? (b) what kind of reagent is each of these compounds? 1) KMnO4…
(a) What type of chemical reaction will result when a flammable solvent is mixed
(a) What type of chemical reaction will result when a flammable solvent is mixed with any of the following compounds? (b) what kind of reagent is each of these compounds? 1) KMnO4…
(a) When 0.10 mol of the ionic solid NaX, where X is an unknown anion, is dissol
(a) When 0.10 mol of the ionic solid NaX, where X is an unknown anion, is dissolved in enough water to make 1.0 L of solution, the pH of the solution is 8.66. When 0.10 mol of the…
(a) When 1.50 mol of Al and 3.00 mol of Cl2 combine in reaction 2 Al(s) + 3 Cl2(
(a) When 1.50 mol of Al and 3.00 mol of Cl2 combine in reaction 2 Al(s) + 3 Cl2(g) -----> 2 AlCl3(s), which is the limiting reactant? (b) How many moles of AlCl3 are formed? (c…
(a) When 1.50 mol of Al and 3.00 mol of Cl2 combine in reaction 2 Al(s) + 3 Cl2(
(a) When 1.50 mol of Al and 3.00 mol of Cl2 combine in reaction 2 Al(s) + 3 Cl2(g) -----> 2 AlCl3(s), which is the limiting reactant? (b) How many moles of AlCl3 are formed? (c…
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (b)Which atoms are electrophilic centers (i.e., can react with nucleophiles)? (c) Which atoms are ba…
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (b)Which atoms are electrophilic centers (i.e., can react with nucleophiles)? (c) Which atoms are ba…
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (b)Which atoms are electrophilic centers (i.e., can react with nucleophiles)? (c) Which atoms are ba…
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (b)Which atoms are electrophilic centers (i.e., can react with nucleophiles)? (c) Which atoms are ba…
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (b)Which atoms are electrophilic centers (i.e., can react with nucleophiles)? (c) Which atoms are ba…
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (b)Which atoms are electrophilic centers (i.e., can react with nucleophiles)? (c) Which atoms are ba…
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (b)Which atoms are electrophilic centers (i.e., can react with nucleophiles)? (c) Which atoms are ba…
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (
(a) Which atoms are nucleophilic centers (i.e., can react with electrophiles)? (b) Which atoms are electrophilic centers (i.e., can react with nucleophiles)? (c) Which atoms are b…
(a) Which direction do the electrons go in the external wire? toward the zinc el
(a) Which direction do the electrons go in the external wire? toward the zinc electrodetoward the copper electrode (b) In which half cell will a reduction take place? Zn2+/Zn…
(a) Which kind of mechanism can better account for the product mixture obtained
(a) Which kind of mechanism can better account for the product mixture obtained from the dehydration of cis- and trans-4-methylcyclohexanol: E1, E2, or a combination of the two? (…
(a) Which of the following has all idealized bond angles just slightly less than
(a) Which of the following has all idealized bond angles just slightly less than 120? BF3 NH3 SF6 ClF3 (b) Which molecule has only 90 and 180 bond angles and one lone pair of elec…
(a) Which of the following is the correct rate law for the forward reaction in s
(a) Which of the following is the correct rate law for the forward reaction in step (1)? rate = k1[A]2 rate = k-1[A2] rate = k1[A]2 - k-1[A2] rate = k1 Ý 2 Ý [A] (b) Which of the …
(a) Which of the following requires that an array be sorted before it is execute
(a) Which of the following requires that an array be sorted before it is executed? A. binary search B. array copying C. selection sort D. sequential search (b) Which term best des…
(a) Will Co(OH)2 precipitate from solution if the pH of a 0.042 M solution of Co
(a) Will Co(OH)2 precipitate from solution if the pH of a 0.042 M solution of Co(NO3)2 is adjusted to 7.95? (Ksp of Co(OH)2 is 1.3×10-15). Support your answer by calculating the i…
(a) With the aid of a plot, explain what a Phase diagram is for a single pure su
(a) With the aid of a plot, explain what a Phase diagram is for a single pure substance, outlining its main features. Explain the terms: (0 Superheated vapour and (ii) degrees of …
(a) Write a method public int reverse (int nun) which reverses the digits in a n
(a) Write a method public int reverse (int nun) which reverses the digits in a number. For example, if the number is 4395, then its reverse is 5934. Your method need not make any …
(a) Write a method public int reverse(int num) which reverses the digits in a nu
(a) Write a method public int reverse(int num) which reverses the digits in a number. For example, if the number is 4395, then its reverse is 5934. Your method need not make any a…
(a) You have an equimolar mixture of ethanol (1) and 1-propanol (2) at atmospher
(a) You have an equimolar mixture of ethanol (1) and 1-propanol (2) at atmospheric pressure (1 bar). Compute the dew point and bubble point of this mixture, making sure to think a…
(a) acceptable to dry volumetric glassware at high temperature 12] 161 [7] 14] (
(a) acceptable to dry volumetric glassware at high temperature 12] 161 [7] 14] (b) advisable to dry the interior of glassware List the rules for handling reagents and solutions 4 …
(a) and (b) are concerning two samples different gases, gas Kr and gas F_2 that
(a) and (b) are concerning two samples different gases, gas Kr and gas F_2 that are at the same temperature and pressure in containers of equal volume. (a) Which gas has a higher …
(a) during its solvolysis reaction, some 2-bromo-2-methylpropane molecules lose
(a) during its solvolysis reaction, some 2-bromo-2-methylpropane molecules lose HBr by an E1 reaction to form an Alkene. would you expect this to affect the measured reaction rate…
(a) if we mix 2.00L of 3.00M (NH 4 ) 2 CO 3 , 4.00L of 1.50M (NH 4 ) 2 CO 3 solu
(a) if we mix 2.00L of 3.00M (NH4)2CO3, 4.00L of 1.50M (NH4)2CO3 solutions and 4.00L of water, Calculate the final concentration. Assume there is no volume contraction upon mixing…
(a) in what direction must the field be oriented so that the electrons are defle
(a) in what direction must the field be oriented so that the electrons are deflected vertically upward? (b) if we neglect the gravitational force, how strong must the field be bet…
(a) iodine crystals 1 pure substance homogeneousmixture heterogeneous mixture (b
(a) iodine crystals 1 pure substance homogeneousmixture heterogeneous mixture (b) iodine solution 2 pure substance homogeneousmixture heterogeneous mixture (c) ethanol pur…
(a) mass, in grams, of 1.50 × 10 mol Cas (b) number of moles of NH4Cl in 86.6 g
(a) mass, in grams, of 1.50 × 10 mol Cas (b) number of moles of NH4Cl in 86.6 g of this substance (c) number of molecules in 8.447 x 10 2 mol C&Hb; (d) number of O atoms in 6.…
(a) the vapour pressure of an ideal solution containing 32g of methanol and 138g
(a) the vapour pressure of an ideal solution containing 32g of methanol and 138g of ethanol is 0.3 atm at 27 C. When 46g more of ethanol is added to the same solution the vapour p…
(a) to obtain the final temerature for the resulting solution i.e. 40% NaOH, we
(a) to obtain the final temerature for the resulting solution i.e. 40% NaOH, we mark one point representing the 10% NaOH at 21deg C and other point representing the 70% NaOH at 93…
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