Chemistry concepts and calculations
117302 questions • Page 8 / 2347
(1) Classify the following statements as true (T), or false (F). If you classify
(1) Classify the following statements as true (T), or false (F). If you classify statement as false, correct it, or explain why it is false. (a) If given stereoisomer rotates the …
(1) Consider an equilibrium gas phase containing (only) solid C(s) and a gas pha
(1) Consider an equilibrium gas phase containing (only) solid C(s) and a gas phase containing only co CO2, H2, H20 (a) How may degrees of freedom for this system? (Report P,C,F). …
(1) Define the following terms: faraday, salt bridge, anode, cathode, voltaic ce
(1) Define the following terms: faraday, salt bridge, anode, cathode, voltaic cell, electrolytic cell. (2) Consider the following galvanic cell: Pt -Ni Ni2+ (a) Identify the anode…
(1) Download this file and save it in the directory where you\'ve saved your lab
(1) Download this file and save it in the directory where you've saved your lab8.py file: http://www.ics.uci.edu/~harris/python/menu1.txt. Take a look at the file's contents: Its …
(1) Exercise 13.93 A 10.0 mL sample of an unknown H3PO4 solution requires 102 mL
(1) Exercise 13.93 A 10.0 mL sample of an unknown H3PO4 solution requires 102 mL of 0.150 M KOH to completely react with the H3PO4. What was the concentration of the unknown H3PO4…
(1) F. P. A. Cal Culator obtained the following results for replicate determinat
(1) F. P. A. Cal Culator obtained the following results for replicate determinations of calcium in limestone: 14.35%, 14.41%, 14.40%, 14.32%, and 14.37%. Calculate the confiden…
(1) First we split the reactions into two half reactions: Cd ---> Cd 2+ PbO 2 --
(1) First we split the reactions into two half reactions: Cd ---> Cd2+ PbO2 ---> Pb2+ Next we balance all atoms other than H and O: Cd ---> Cd2+ PbO2 ---> Pb2+ Next we…
(1) For each of the salts on the left, match the salts on the right that can be
(1) For each of the salts on the left, match the salts on the right that can be compared directly, using Ksp values, to estimate solubilities. (If more than one salt on the right …
(1) For the precipitates that formed, write the complete molecular reaction, the
(1) For the precipitates that formed, write the complete molecular reaction, the complete (full) ionic equation and lastly, the net ionic equation for the following: a) BaCl2 + Na…
(1) Gas-phase molecules are free to moveabout their container. In liquids and so
(1) Gas-phase molecules are free to moveabout their container. In liquids and solids, molecules areheld closely together by the intermolecular forcesdescribed in section 11.2 of y…
(1) HNO3 + LiOH --------------? ________ + ___________ (3 pts) [1] The chemical
(1) HNO3 + LiOH --------------? ________ + ___________ (3 pts) [1] The chemical formula of the salt is ________________ [2] Can this salt hydrolyzed? Answer _____________. If yes,…
(1) HNO3 + LiOH --------------? ________ + ___________ (3 pts) [1] The chemical
(1) HNO3 + LiOH --------------? ________ + ___________ (3 pts) [1] The chemical formula of the salt is ________________ [2] Can this salt hydrolyzed? Answer _____________. If yes,…
(1) How do you add up all of the elements in an array with NUM_ELEMENTS elements
(1) How do you add up all of the elements in an array with NUM_ELEMENTS elements? (fill in the blank) float arr[NUM_ELEMENTS]; double total=0; ... for ( int i = 0 ; i < NUM_ELE…
(1) How many moles of NaOH reacted in Trial 1? (2) What was the experimental mol
(1) How many moles of NaOH reacted in Trial 1? (2) What was the experimental molarity (M) for NaOH in Trial 1? The NaOH used in this lab was 0.1M Run 1 0.1388M C6H8O7 ml …
(1) Identify each of the following half-reactions as either an oxidation half-re
(1) Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction. (2) Write a balanced equation for the overall redox reaction. …
(1) Identify each of the following half-reactions as either an oxidation half-re
(1) Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction. (2) Write a balanced equation for the overall redox reaction. …
(1) Identify the acid-base conjugate pairs in each of the following reactions: (
(1) Identify the acid-base conjugate pairs in each of the following reactions: (a)CH,CO0+HCN CH,COOH +CN (d)HCIOCH,NH CHINHS+CIO (2) Classify each of the following species as a we…
(1) If 0.43g of aluminum foil was dissolved in sufficient 3M of KOH solution, an
(1) If 0.43g of aluminum foil was dissolved in sufficient 3M of KOH solution, and the solution was acidified with 4M H2SO4, what is the theoretical yield of KAl(SO4)2 x 12H2O? (2)…
(1) If 1280 g of a potassium molybdate is dissolved in 1980 g of water solvent,
(1) If 1280 g of a potassium molybdate is dissolved in 1980 g of water solvent, calculate the boiling temperature of the solution. Consider if the solute is an electrolyte. K2MoO4…
(1) If you are trying to freeze a liquid by cooling it, what happens to the temp
(1) If you are trying to freeze a liquid by cooling it, what happens to the temperature? Sketch a graph of temperature versus time during the cooling. (2) Define molality. What ar…
(1) If you have 0.5 moles of NaCl, how many grams of salt doyou have? (2) If we
(1) If you have 0.5 moles of NaCl, how many grams of salt doyou have? (2) If we have 0.2 moles of H3PO4 and react it with 0.6 molesof NH3; how many grams of (NH4)3 will we end up …
(1) In artificial photosynthesis, energy required to drive water electrolysis is
(1) In artificial photosynthesis, energy required to drive water electrolysis is provided from light energy in the presence of photocatalyst. What is the longest wavelength of lig…
(1) It is well understood that the spectroscopic absorbance of an analyte specie
(1) It is well understood that the spectroscopic absorbance of an analyte species in solution is proportional to its concentration, at least within a certain range of values ("Bee…
(1) It is well understood that the spectroscopic absorbance of an analyte specie
(1) It is well understood that the spectroscopic absorbance of an analyte species in solution is proportional to its concentration, at least within a certain range of values ("Bee…
(1) Label each of the following as either a physical change or a chemical reacti
(1) Label each of the following as either a physical change or a chemical reaction: (a) An iron nail rusts; (b) An ice cube melts; (c) A puddle of water evaporates. (2) L…
(1) Melting points of pure 2- and 4-bromonitrobenzene are 41 (1) Melting points
(1) Melting points of pure 2- and 4-bromonitrobenzene are 41 (1) Melting points of pure 2- and 4-bromonitrobenzene are 41 (1) Melting points of pure 2- and 4-bromonitrobenzene are…
(1) Most redox reactions are performed under non-standard conditions. Consider t
(1) Most redox reactions are performed under non-standard conditions. Consider the permanganate to manganese (II) ion half-cell, represented by the reaction: MnO4 - (aq) + 8H+ (aq…
(1) Multiple Choice (1 point each) Which of the following is soluble in water at
(1) Multiple Choice (1 point each) Which of the following is soluble in water at 25? (a) AgNO (b) PbClh (c) AgCI (d) AgS (e) Hg Ch 1. 2. With which of the following will the Sodiu…
(1) On a balance weigh 0.5 grams of algae powder and -0.5 grams of anhydrous mag
(1) On a balance weigh 0.5 grams of algae powder and -0.5 grams of anhydrous magnesium sulfate. (2) Transfer (1) to a large test tube and combine with 2.0 ml of acetone. Stopper t…
(1) One issue confronting the use of 14C decay (half-life of 5760 years) to date
(1) One issue confronting the use of 14C decay (half-life of 5760 years) to date materials is that of obtaining a standard. One approach to this issue is found in the field of den…
(1) Part A: If a electron in a hydrogen atom makes a transition from ground stat
(1) Part A: If a electron in a hydrogen atom makes a transition from ground state to n = 8 level what wavelength of light in (nm) would be needed for the abosorbed photon to cause…
(1) Preparation of acetate buffer: Calculate the amount of sodium acetate trihyd
(1) Preparation of acetate buffer: Calculate the amount of sodium acetate trihydrate needed to make 1.00 L of a 0.0100 M acetate buffer at pH 5.5 (2) Preparation of 100 ppm ammoni…
(1) R. Mortonemia is an extremophilic bacteria that gains its energy from a spec
(1) R. Mortonemia is an extremophilic bacteria that gains its energy from a specific protein, commonly found in yogurt, called dannonin. A researcher is studying the protein danno…
(1) Sucrose (C 12 H 22 O 11 ) is found to have a standard enthalpy of combustion
(1) Sucrose (C12H22O11) is found to have a standard enthalpy of combustion of -5,640.9 kJ/mole. The standard enthalpies of formation of CO2 (g) and H2O (l) are -393.51 and --285.8…
(1) The observed half life for this reaction when the starting concentration is
(1) The observed half life for this reaction when the starting concentration is 5.25×10-3 M is s and when the starting concentration is 2.63×10-3 M is___ s. (2) The average rate o…
(1) The phenol concentration in a water solution is 20 ppm and the density of th
(1) The phenol concentration in a water solution is 20 ppm and the density of this solution is 1.1 g/cm3. Please express the concentration by mg/L (2) Calculate pH for a solution …
(1) The radioactive isotope fluorine-18 is used in medical imaging as indicated
(1) The radioactive isotope fluorine-18 is used in medical imaging as indicated on the table above. How many protons and neutrons are there in a fluorine-18 atom? _____protons ___…
(1) Using a FOR loop to write a program that will promt the user for 5 numbers a
(1) Using a FOR loop to write a program that will promt the user for 5 numbers and calculate the sum of the 5 numbers. You've written a similar program in the last lab using a WHI…
(1) What is an abstract class and how does it differ from a regular class? (2) W
(1) What is an abstract class and how does it differ from a regular class? (2) Why are abstract class constructors defined as protected? (3) Class X defines method M1( ) as abstra…
(1) What is the difference between thermodynamics and kinetics? (2) According to
(1) What is the difference between thermodynamics and kinetics? (2) According to Table 1, run 1, once all solutions are added, what is the concentration of HCl assuming the initia…
(1) What is the first item on the line for a function prototype? Select one: a.
(1) What is the first item on the line for a function prototype? Select one: a. function name b. return value c. return statement d. parameter name e. data name f. comma separated…
(1) What is the half-life for the reaction starting at t=0 s ? ______ s What is
(1) What is the half-life for the reaction starting at t=0 s? ______s What is the half-life for the reaction starting at t=1000 s? _______s Does the half-life increase, decrease o…
(1) What is the half-life for the reaction starting at t=0 s ? ______ s What is
(1) What is the half-life for the reaction starting at t=0 s? ______s What is the half-life for the reaction starting at t=1000 s? _______s Does the half-life increase, decrease o…
(1) What is the relationship, if any, between the following pairs of substances
(1) What is the relationship, if any, between the following pairs of substances : a) Strong electrolyte and strong acid or base. b). Weak electrolyte and weak acid or base. c). Th…
(1) Which of the following amino acids can readily lydrogen bond with other amin
(1) Which of the following amino acids can readily lydrogen bond with other amino acids within a protein ? (1pt) A. Valine B. Glutamine C. Proline D. Leucine (2) Match the amino a…
(1) Which of the following elements would have the greatest tendency to form an
(1) Which of the following elements would have the greatest tendency to form an interstitial solid solution? Briefly explain your answer. Polonium, Sodium, Platinum, Zinc, Diamod,…
(1) Which of the following is NOT used as a sorbent (stationary phase) for chrom
(1) Which of the following is NOT used as a sorbent (stationary phase) for chromatography: A starch B sand C alumina D silica gel E cellulose A hexane B EtOAc/Hexane 1:20 C EtOAc/…
(1) Which of the following is essential for autothermal reactor operation? (i) E
(1) Which of the following is essential for autothermal reactor operation? (i) Exothermic reaction in a non-adiabatic reactor (ii) Exothermic reaction in an adiabatic reactor (ii)…
(1) Which of these statements best describes the difference between an inelastic
(1) Which of these statements best describes the difference between an inelastic collision and an elastic collision? (a) If colliding objects stick to each other after the collisi…
(1) Which one of the following is not true concerning automotive air bags? a) A
(1) Which one of the following is not true concerning automotive air bags? a) A gas is produced when the air bag activates. b) The gas used for inflating them is oxygen. c) They a…
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