Chemistry concepts and calculations
117302 questions • Page 2156 / 2347
a) For each process, predict the sign of delta S for the system: decomposition o
a) For each process, predict the sign of delta S for the system: decomposition of CaCO_2(s) to give CaO(s) and CO_2(g) _________ heating bromine vapor from 45 degree C to 80 degre…
a) For your cereal sample, you added the same volume of sodium acetate that you
a) For your cereal sample, you added the same volume of sodium acetate that you added to your standards and solution unknown. b) You forgot to add hydroxylamine hydrochloride when…
a) For your cereal sample, you added the same volume of sodium acetate that you
a) For your cereal sample, you added the same volume of sodium acetate that you added to your standards and solution unknown. b) You forgot to add hydroxylamine hydrochloride when…
a) For your cereal sample, you added the same volume of sodium acetate that you
a) For your cereal sample, you added the same volume of sodium acetate that you added to your standards and solution unknown. b) You forgot to add hydroxylamine hydrochloride when…
a) For your cereal sample, you added the same volume of sodium acetate that you
a) For your cereal sample, you added the same volume of sodium acetate that you added to your standards and solution unknown. b) You forgot to add hydroxylamine hydrochloride when…
a) For your cereal sample, you added the same volume of sodium acetate that you
a) For your cereal sample, you added the same volume of sodium acetate that you added to your standards and solution unknown. b) You forgot to add hydroxylamine hydrochloride when…
a) For your cereal sample, you added the same volume of sodium acetate that you
a) For your cereal sample, you added the same volume of sodium acetate that you added to your standards and solution unknown. b) You forgot to add hydroxylamine hydrochloride when…
a) From inspection of your data in Table II, over what pH range does phosphate b
a) From inspection of your data in Table II, over what pH range does phosphate buffer have its best buffering capacity?How does your data support this? b) Is your 0.10 M phosphate…
a) From inspection of your data in Table II, over what pH range does phosphate b
a) From inspection of your data in Table II, over what pH range does phosphate buffer have its best buffering capacity?How does your data support this? b) Is your 0.10 M phosphate…
a) From the Chapter 1 quiz: The densities of the coinage metals (copper, silver
a) From the Chapter 1 quiz: The densities of the coinage metals (copper, silver and gold) are as follows: copper = 8.95 g/cm3, silver = 12.59 g/cm3, gold = 19.32 g/cm3 A sample of…
a) Give the correct IUPAC name and sketch the structure of the transition metal
a) Give the correct IUPAC name and sketch the structure of the transition metal complex for each of the following compounds. If multiple stereoisomers are possible, give both name…
a) Given the following data from a batch reactor experiment, determine if the re
a) Given the following data from a batch reactor experiment, determine if the reaction is 0^th, 1^st, or 2^nd order, and what the reaction rate constant k is (with appropriate uni…
a) Given the initial concentration of each of the reactants, calculate the final
a) Given the initial concentration of each of the reactants, calculate the final concentrations of A, B, and C. Assume the reaction goes to completion. [A]initial= 5.0 x 10^-7 M […
a) Given: P = 11.9 atm V = 18.5 L T = 340.0 K find number of moles using: P * V
a) Given: P = 11.9 atm V = 18.5 L T = 340.0 K find number of moles using: P * V = n*R*T 11.9 atm * 18.5 L = n * 0.08206 atm.L/mol.K * 340 K n = 7.89 mol Answer: 7.89 mol b) Given:…
a) Gold has a fcc structure and it is therefore believed that a radioactive gold
a) Gold has a fcc structure and it is therefore believed that a radioactive gold tracer moves by means of a vacancy mechanism. Experiments on self-diffusion in pure gold give an a…
a) Gold has a fcc structure and it is therefore believed that a radioactive gold
a) Gold has a fcc structure and it is therefore believed that a radioactive gold tracer moves by means of a vacancy mechanism. Experiments on self-diffusion in pure gold give an a…
a) H3PO4 b) CH3COOH c)HF d) H2O e)HNO3 WHICH OF THE FOLLOWING IS THE REDUCING AG
a) H3PO4 b) CH3COOH c)HF d) H2O …
a) How does the cell potential tell you if a Galvanic cell will spontaneously ge
a) How does the cell potential tell you if a Galvanic cell will spontaneously generate electricity? b) A Galvanic cell has the following cell notation: Mn(s) I Mn^2+ (1M) II Zn^2+…
a) How many grams of CaCl2 are needed to make 213.8 g of a solution that is 38.5
a) How many grams of CaCl2 are needed to make 213.8 g of a solution that is 38.5% (m/m) calcium chloride in water? Note that mass is not technically the same thing as weight, but …
a) How many grams of sodium sulfate can be added to 500 mL of 3.100E-3 M barium
a) How many grams of sodium sulfate can be added to 500 mL of 3.100E-3M barium chloride before a precipitate forms? The Ksp for BaSO4 is 1.1E-10. = _____g b) Solid KSCN was added …
a) How many grams of solid calcium carbonate must decompose to produce solid cal
a) How many grams of solid calcium carbonate must decompose to produce solid calcium oxide and 542.0 mL carbon dioxide gas at 298°C and 729 torr? b)A piece of magnesium reacts wit…
a) How many moles of Al 2 (SO 4 ) 3 are required to make 45 mL of a 0.080 M Al 2
a) How many moles of Al2(SO4)3 are required to make 45 mL of a 0.080 M Al2(SO4)3 solution? (Hint, molarity is moles per liter. You know the molarity. You are given the number of m…
a) How many moles of Al 2 (SO 4 ) 3 are required to make 48 mL of a 0.010 M Al 2
a) How many moles of Al2(SO4)3 are required to make 48 mL of a 0.010 M Al2(SO4)3 solution? (Hint, molarity is moles per liter. You know the molarity. You are given the number of m…
a) How many pairs of non-bonding electrons are there in the molecule? b) How man
a) How many pairs of non-bonding electrons are there in the molecule? b) How many CH3 (methyl) groups are there in the molecule?? c) How many CH2 (methylene) groups are there in t…
a) How much of each, stock and water would be necessary todirectly make 10 ml of
a) How much of each, stock and water would be necessary todirectly make 10 ml of a 1/100 dilution? b) If you were directly make 20 ml of a 0.02% solution using a2% stock , how muc…
a) How to do I calculate the pH of original buffer given mass of NaC2H3O2*H2O (F
a) How to do I calculate the pH of original buffer given mass of NaC2H3O2*H2O (FW =136 g/mol) = 3.507 g after measuring out 8.8 mL of 3.0 M acetic acid to add to the beaker contai…
a) How to do I calculate the pH of original buffer given mass of NaC2H3O2*H2O (F
a) How to do I calculate the pH of original buffer given mass of NaC2H3O2*H2O (FW =136 g/mol) = 3.507 g after measuring out 8.8 mL of 3.0 M acetic acid to add to the beaker contai…
a) How will increasing the concentration of CO shift the equilibrium? b) How wil
a) How will increasing the concentration of CO shift the equilibrium? b) How will increasing the concentration of CO2 shift the equilibrium? c) How will decreasing the volume of t…
a) I 2 (s) + Cu (s) ----> 2 I - (aq) + Cu 2+ (aq) Hint: Carry at least 5 signifi
a) I2(s) + Cu(s) ----> 2I-(aq) + Cu2+(aq) Hint: Carry at least 5 significant figures during intermediate calculations to avoid round off error when taking the antilogarithm. Yo…
a) Identify the 3 ionizable groups within the tripeptide. b) There are four diff
a) Identify the 3 ionizable groups within the tripeptide. b) There are four different structures of the tripeptide across a pH range from 1 to 12. What is the overall charge of ea…
a) Identify the nucleophile in the substitution reaction: CH3OH+NaICH3I+NaOH. b)
a) Identify the nucleophile in the substitution reaction: CH3OH+NaICH3I+NaOH. b) Identify the electrophile in the reaction above. c) Identify the leaving group in the reaction abo…
a) Identify the number of activating and deactivating groups on each ring b) Bas
a) Identify the number of activating and deactivating groups on each ring b) Based on your answer to the previous question, which ring of Diclofenac would be more activated toward…
a) If 3.50 mol of Fe reacts with 3.00 mol of oxygen in the following reaction. 4
a) If 3.50 mol of Fe reacts with 3.00 mol of oxygen in the following reaction. 4Fe(s)+3O2(g)-->2Fe2O3(s). Which of the following statements is correct? 1) O2 is the limiting re…
a) If a first-order reaction has an activation energy of 104.6 kJ/mol and, in th
a) If a first-order reaction has an activation energy of 104.6 kJ/mol and, in the equation k = k0 exp (-Ea/RT), k0 has a value of 5×1013/s, at what temperature will the reaction h…
a) If a salt containing the conjugate base of a weak acid is dissolved in water,
a) If a salt containing the conjugate base of a weak acid is dissolved in water, the pH of the resulting solution is _____ (less than, equal to, greater than) seven. b) The K_sp o…
a) If a sample of NaBH_4 is 70% pure by mass (the remaining 30% is incapable of
a) If a sample of NaBH_4 is 70% pure by mass (the remaining 30% is incapable of reducing carbonyls or reacting with the reactant or product), What is the minimum mass of the NaBH_…
a) If a sample of gas occupies 7.8 L at 325 C what will be itsvolume at 25 C is
a) If a sample of gas occupies 7.8 L at 325 C what will be itsvolume at 25 C is pressure stays constant? b) A gas has a pressure of 7.9 kPa at 560 K what will be thepressure at 21…
a) If an electric car is capable of going 225 km on a singer charge, how many ch
a) If an electric car is capable of going 225 km on a singer charge, how many charges will it need to travel from Seattle,Washington, to San Diego,California,a distance of 1257 mi…
a) If hair grows at a rate of 37 cm per year, then what is the rate of peptide b
a) If hair grows at a rate of 37 cm per year, then what is the rate of peptide bond synthesis (peptide bonds per second) that would account for the observed growth of hair? Assume…
a) If the initial sample is 2.75 g, what mass of the original iridium-192 remain
a) If the initial sample is 2.75 g, what mass of the original iridium-192 remains after 15 Number g b) Estimate the half-life of the radioisotope, Number days c) How many days wou…
a) If the initial sample is 3.50 g, what mass of the original iridium-192 remain
a) If the initial sample is 3.50 g, what mass of the original iridium-192 remains after 150 days? b) Estimate the half-life of the radioisotope. c) How many days would it take for…
a) If the initial sample is 3.50 g, what mass of the original iridium-192 remain
a) If the initial sample is 3.50 g, what mass of the original iridium-192 remains after 150 days? b) Estimate the half-life of the radioisotope. c) How many days would it take for…
a) If the student started with 10.6 g of benzaldehyde and 29 g of acetone, what
a) If the student started with 10.6 g of benzaldehyde and 29 g of acetone, what is the theoretical yield of the product? b) If 10.5 g of the yellow product is obtained, calculate …
a) If this electrode is the rigth-hand electrode and the SHE is the left-hand el
a) If this electrode is the rigth-hand electrode and the SHE is the left-hand electrode, the cell potential is -0.245 V. What is the activity of the sulfate ion in this cell? b) C…
a) If this electrode is the rigth-hand electrode and the SHE is the left-hand el
a) If this electrode is the rigth-hand electrode and the SHE is the left-hand electrode, the cell potential is -0.245 V. What is the activity of the sulfate ion in this cell? b) C…
a) If this electrode is the rigth-hand electrode and the SHE is the left-hand el
a) If this electrode is the rigth-hand electrode and the SHE is the left-hand electrode, the cell potential is -0.245 V. What is the activity of the sulfate ion in this cell? b) C…
a) If two samples of different elements contain the same number of atoms, they c
a) If two samples of different elements contain the same number of atoms, they contain the same number of moles. b) If two samples of different elements have the same mass, they c…
a) In Escherichia Coli , coupled oxidation-reduction reactions within the cell m
a) In Escherichia Coli, coupled oxidation-reduction reactions within the cell membrane have the effect of reducing the H+ concentration such that [H+]in/[H+]out is 0.4 and at the…
a) In Half cell B Concentration of Zn2+ decrease Half cell B having more concent
a) In Half cell B Concentration of Zn2+ decrease Half cell B having more concentration than Half cell A So, Zn2+ ions in Half cell B will be reduced to Zn(s) and Zn(s) in Half Cel…
a) In a chemical reaction one mole of gas reacts with a liquid generating anothe
a) In a chemical reaction one mole of gas reacts with a liquid generating another liquid and one mole of another gas. Would you expect DS to be positive, negative, or close to zer…
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