Chemistry concepts and calculations
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10. A student did an experiment to calculate percent composition of a mixture of
10. A student did an experiment to calculate percent composition of a mixture of sand and Potassium chloride. At the end of the experiment, student determined that the mixture had…
10. A thermodynamically-controlled reaction will yield predominantly: 9. Which c
10. A thermodynamically-controlled reaction will yield predominantly: 9. Which compound would have a uv absorption band at longest wavelength? a) I b) II c) III d) IV e) V reactio…
10. Ammonia burns in oxygen according to the following equation: 4 NH3 (g) + 502
10. Ammonia burns in oxygen according to the following equation: 4 NH3 (g) + 502(g) 4NO (g) +6 H20 (g) Calculate the enthalpy change (AH) for this reaction based on the following …
10. An 8000 m 3 lake has a pH of 4. For this problem, assume no water is added o
10. An 8000 m3 lake has a pH of 4. For this problem, assume no water is added or withdrawn from the lake. a. What is the molarity of H+ in the lake? …
10. An on-column is used present in the sample. An injection (a) when a very sma
10. An on-column is used present in the sample. An injection (a) when a very small amount of analyte is (b) when the sample decomposes above its boiling point. (c) when the sample…
10. An oxide that reacts only with bases is called a(an) a Acidic oxide b. Basic
10. An oxide that reacts only with bases is called a(an) a Acidic oxide b. Basic oxide c. Amphoteric oxide d. Any metal oxide e. None of the above 11. Which of the following state…
10. Antacids are bases used to neutralize the acid that often causes stomach pai
10. Antacids are bases used to neutralize the acid that often causes stomach pain and heartburn. Despite the many commercial brands of antacids, almost all include weak bases that…
10. Array Operations Write a program with an array that is initialized with test
10. Array Operations Write a program with an array that is initialized with test data. Use any primitive data type of your choice. The program should also have the following metho…
10. Below is a molecular orbital diagram for the hypothetical molecule XY. XY 0
10. Below is a molecular orbital diagram for the hypothetical molecule XY. XY 0 a) What is the first ionization energy of atom Y? eV -4 5 -6 -8 -10 -12 b) What is the first ioniza…
10. Below is a molecular orbital diagram for the hypothetical molecule XY. XY 0
10. Below is a molecular orbital diagram for the hypothetical molecule XY. XY 0 a) What is the first ionization energy of atom Y? eV -4 5 -6 -8 -10 -12 b) What is the first ioniza…
10. CaO (s) reacts with water to form Ca(OH)2(aq). If 6.50 g CaO is combined wit
10. CaO (s) reacts with water to form Ca(OH)2(aq). If 6.50 g CaO is combined with 99.70 g H20 in a coffee cup calorimeter, the temperature of the resulting solution increases from…
10. Calculate the pH before and after adding 0.05 mol of NaOH to (1) 1.00 L H>0,
10. Calculate the pH before and after adding 0.05 mol of NaOH to (1) 1.00 L H>0, (2) 1.00 L buffer made from 0.45 M HF (Ka = 7.2x 10") and 0.50 M NaF, and (3) 1.00 L buffer mad…
10. Calculate the percent oxalic acid dihydrate in an \'unknown if the sample ma
10. Calculate the percent oxalic acid dihydrate in an 'unknown if the sample mass was 1.0994g and was titrated against 2.33mL of 0.327M KOH (10 points). a. 5.28% b. 3.23% c. 4.37%…
10. Challenge. Naphthalene is a hydrocarbon with 93.71% carbon by mass. A 0.256-
10. Challenge. Naphthalene is a hydrocarbon with 93.71% carbon by mass. A 0.256-mol sample has a mass of 32.8 g. Naphthalene works as a pesticide in mothballs by sublimation of th…
10. Consider a hypothetical reaction in which A and B are reactants and C and D
10. Consider a hypothetical reaction in which A and B are reactants and C and D are products. If 19 grams of A completely reacts with 21 grams of B to produce 11 grams of C, how m…
10. Consider an electrophilic addition reaction. Which of the following statemen
10. Consider an electrophilic addition reaction. Which of the following statements regarding Markovnikov’s rule is FALSE? a. It refers to the process of electrophilic addition to …
10. Consider four 100.0-g samples of water, each in a separate beaker at 25.0 de
10. Consider four 100.0-g samples of water, each in a separate beaker at 25.0 degree C. Into each beaker you drop 10.0 g of a different metal that has been heated to 95.0 degree C…
10. Consider the following equilibrium reaction: HSO 4 (aq) + OH (aq) SO 4 2 (aq
10. Consider the following equilibrium reaction: HSO4(aq) + OH(aq) SO42(aq) + H2O(l) Which substances are acting as acids in the reaction? [A] OH and SO42 [B] SO42 and H2…
10. Consider the following particulate-level representation of a reaction. How w
10. Consider the following particulate-level representation of a reaction. How would this reaction be classified? a. Combination c. Single Replacement d. Double Replacement e. Aci…
10. Consider the following reaction between isopropyl alcohol and oxygen C3H50 (
10. Consider the following reaction between isopropyl alcohol and oxygen C3H50 (g) O2 (g) CO2 (g) H20 (a) What type of reaction is this? (b) Balance the equation for this reaction…
10. Consider the following reaction: CS 2 (g) + 4 H 2 (g) CH 4 (g) + 2 H
10. Consider the following reaction: CS2 (g) + 4 H2 (g) <====> CH4 (g) + 2 H2S (g) Calculate the value of Keq if the equilibrium concentrations are [CS2] = 0.180, [H2] = 0.2…
10. Consider the following unbalanced redox reaction: Cu 2 O(s) + Cr 3+ (aq) ???
10. Consider the following unbalanced redox reaction: Cu2O(s) + Cr3+ (aq) ????Cu2+(aq) + Cr (s) (A) Below, balance the reaction in both acidic and basic aqueous solution: (B) Iden…
10. Consider this reversible reaction. All substances are gases and are in an in
10. Consider this reversible reaction. All substances are gases and are in an insulated closed chamber with a constant volume and are at equilibrium. 2H2O + 2C12-4HC1+ O2 ??. +113…
10. Determine limiting reagent, excess reagent, theoretical yield, percent yield
10. Determine limiting reagent, excess reagent, theoretical yield, percent yield, and amount of excess reactant remaining. (25 points total) Hydrogen chloride can be prepared by t…
10. Determine the pH of 150 ml of a solution of a household bleach that contains
10. Determine the pH of 150 ml of a solution of a household bleach that contains 4% (w/V) NaClO sodium hypochlorite if the pKa of hypochlorous acid is 7.52 11. A 0.85 M solution o…
10. During the process of titration of antacid made of calcium carbonate, the fi
10. During the process of titration of antacid made of calcium carbonate, the first step is to add excess hydrochloric acid to antacid to observe bubbling, which is forming carbon…
10. Equilibrium constant calculations (see Krasuskopf & Bird, Chapt. 1 or Christ
10. Equilibrium constant calculations (see Krasuskopf & Bird, Chapt. 1 or Christian, Chapt. 6) Cadmium (Cd) is a very toxic contaminant at low concentrations that may be found…
10. Even though lead is to lead compounds were used in ancient times as white pi
10. Even though lead is to lead compounds were used in ancient times as white pigments in cosmetics. What is the percentage of lead by mass in lead(IV) carbonate, Pb(CO3)? a. 81.4…
10. For a body to be equilibrium under the combined action of several forces, pi
10. For a body to be equilibrium under the combined action of several forces, pick the best answer: all the forces must be applied at the same point B) A) all of the forces acting…
10. For the reaction 3A(g) + 2B(g) 2C(g) + 2D(g) the following data was collecte
10. For the reaction 3A(g) + 2B(g) 2C(g) + 2D(g) the following data was collected at constant temperature. Determine the correct rate law for this reaction Trial InitialIAl Initia…
10. For the reaction: Cu2+ (aq) + 4NH3 (aq) [Cu(NH3)42+] (aq) Pale blue Royal bl
10. For the reaction: Cu2+ (aq) + 4NH3 (aq) [Cu(NH3)42+] (aq) Pale blue Royal blue What color will the reaction be if HCl is added, which will react with the ammonia? A. Pale blue…
10. G for a reaction is 1 .9 kJ at 298 K. AH is 3.6 k. Which of the following ex
10. G for a reaction is 1 .9 kJ at 298 K. AH is 3.6 k. Which of the following expressions can be solved to find G at 545 K? a._1.9kJ 298K = 3.6k/ 545K 298K x 1.9kJ 298K-545K = 3.6…
10. Gasoline is used to fuel a 4000 pound car accelerating from 0-55 miles per h
10. Gasoline is used to fuel a 4000 pound car accelerating from 0-55 miles per hour. How many g of C8H18 are needed? Assume perfect efficiency. (hints: 1 kg=2.20 pound, 1 mile=1.6…
10. Give the type of enzyme that catalyzes these types of reactions: carboxylic
10. Give the type of enzyme that catalyzes these types of reactions: carboxylic acid is removed to make CO2 - phosphate transfer involving ATP oxidation/reduction involving a coen…
10. Given the reaction: N2(g)+ O2(g) 182.6 kJ2 NO(g) Which change would cause an
10. Given the reaction: N2(g)+ O2(g) 182.6 kJ2 NO(g) Which change would cause an immediate increase in the rate of the forward reaction? ? (A)increasingthe (A) increasing the conc…
10. How does the rate of corrosion correlate with the voltage driving force? A.
10. How does the rate of corrosion correlate with the voltage driving force? A. Large voltages cause high corrosion rates. B. Small voltages cause high corrosion rates. C. Voltage…
10. In 26th December 2004, deep beneath the the Indian ocean began to shake. The
10. In 26th December 2004, deep beneath the the Indian ocean began to shake. The tremor lasted of the quake. A massive wall of water 8 minutes. The island of Sumatra was the hits …
10. In a typical household, about one-quarter of the energy con water. (a) What
10. In a typical household, about one-quarter of the energy con water. (a) What mass of methane undergoing complete combust (b) How might we heat water more efficiently? (c) What …
10. In a typical household, about one-quarter of the energy con water. (a) What
10. In a typical household, about one-quarter of the energy con water. (a) What mass of methane undergoing complete combust (b) How might we heat water more efficiently? (c) What …
10. In the atoms in the Rutherford-Geiger-Marsden experiment, the alpha particle
10. In the atoms in the Rutherford-Geiger-Marsden experiment, the alpha particles were repelled by a. nuclei. b. electrons. c. neutrons. d. gravity. e. protons 11. Which statement…
10. KEY Consider the first order reaction AB, where A rearranges to give B, time
10. KEY Consider the first order reaction AB, where A rearranges to give B, time 1 minute time 0 minutes How many particles of A exist at r2 min? (A) (B) 2 (C) 4 (D) 8 11. If a re…
10. KEY Consider the first order reaction AB, where A rearranges to give B, time
10. KEY Consider the first order reaction AB, where A rearranges to give B, time 1 minute time 0 minutes How many particles of A exist at r2 min? (A) (B) 2 (C) 4 (D) 8 11. If a re…
10. Most first aid cold packs are based on the endothermic dissolution of ammoni
10. Most first aid cold packs are based on the endothermic dissolution of ammonium nitrate in water. A particular cold pack contains 50.0 g of NH4NO3 and 125.0 g of water. When th…
10. Most of the time, closed-shell and neutral-ligand counting will give you the
10. Most of the time, closed-shell and neutral-ligand counting will give you the same answer because the assumptions they make about the nature of the M-L bond ultimately work the…
10. O 0/1 points | Previous SerCP11 19.CQ.018 Two long, straight wires cross eac
10. O 0/1 points | Previous SerCP11 19.CQ.018 Two long, straight wires cross each other at right angles, and each carries the same current as in the figure below. Which of the fol…
10. Please (Each block with worth 2 points.) this question. Type of Intermolecul
10. Please (Each block with worth 2 points.) this question. Type of Intermolecular Attraction Force What type of a (Listed in order of strongest on top (nonpolar to weakest on the…
10. Polymer-based materials are increasingly substituted for metals in transport
10. Polymer-based materials are increasingly substituted for metals in transportation applications, because polymers typically: a. are stronger, b. are stable to much higher tempe…
10. Radioactive decay is aorder process a. Zero b. First c. Second d. Third e. A
10. Radioactive decay is aorder process a. Zero b. First c. Second d. Third e. All of the above 11. A reaction mechanism is a a. Series of reactions that describe how a reaction o…
10. Sand is converted to pure silicon in a three step Si C14(g) + 2Mg(s) 2MgCl2(
10. Sand is converted to pure silicon in a three step Si C14(g) + 2Mg(s) 2MgCl2(s) + Si(s) What is the enthalpy chang e when 25.0 mol of silicon tetrachloride is converted to elem…
10. Se atomic number is 34 So it has 34 electrons. Two electrons are added to Se
10. Se atomic number is 34 So it has 34 electrons. Two electrons are added to Se atom and become Se-2. So it has totally 36 electrons. It resembles Kr (36) configuration. Answer i…
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