Chemistry concepts and calculations

1. What is the freezing point depression of the benzoic/lauric acid solution? 2.

1. What is the freezing point depression of the benzoic/lauric acid solution? 2. What is the Molal concentration of benzoic/lauric acid solution? 3. Amount of Benzoic acid solute …

1. What is the freezing point depression of the benzoic/lauric acid solution? 2.

1. What is the freezing point depression of the benzoic/lauric acid solution? 2. What is the Molal concentration of benzoic/lauric acid solution? 3. Amount of Benzoic acid solute …

1. What is the frequency (in Hz or sec - 1 ) ofelectromagnetic radiation that ha

1.            What is the frequency (in Hz or sec-1) ofelectromagnetic radiation that has a wavelength of 1.23 x10-6 cm? (A)            2.44 × 1016 (B)             2.44 × 1014 (C)…

1. What is the function of a buffer? 2. How does the capacity of a buffer relate

1. What is the function of a buffer? 2. How does the capacity of a buffer relate to its concentration? 3. Calculate the quantity, in a buffer that h grams, of formic acid and sodi…

1. What is the heat capacity in J/C of a sample of water that contains 16.8 g of

1. What is the heat capacity in J/C of a sample of water that contains 16.8 g of water? 2. 50.0 g hot water at 60.0 C was mixed with 50.0 g cold water at 20.0 C. If the final temp…

1. What is the limiting reagent in the reaction between 1,3-cyclopentadiene and

1. What is the limiting reagent in the reaction between 1,3-cyclopentadiene and maleic anhydride, and why do you think this reagent rather than the other one was made limiting? Sh…

1. What is the major product when (CH3)2CHCH2CH2Br is subjected to the following

1. What is the major product when (CH3)2CHCH2CH2Br is subjected to the following reaction sequence: 1. Mg, ether 2. CO2 3. H3O+? A) 3-methyl-1-butanol B) 4-methylpentanoic acid C)…

1. What is the major product when (CH3)2CHCH2CH2Br is subjected to the following

1. What is the major product when (CH3)2CHCH2CH2Br is subjected to the following reaction sequence: 1. Mg, ether 2. CO2 3. H3O+? A) 3-methyl-1-butanol B) 4-methylpentanoic acid C)…

1. What is the mass in grams of each of the following: a) 4.55 mol of Be b) 6.02

1. What is the mass in grams of each of the following: a) 4.55 mol of Be b) 6.02 x 1024 atoms of Ca c) 3.40 x 105 mol of B 2. What is the formula weight of each of the following? …

1. What is the mass of 10 moles of CO2? 2. How many grams of NaCl are needed to

1. What is the mass of 10 moles of CO2? 2. How many grams of NaCl are needed to make 250 mL of 0.500 M NaCl solution? M=mol/L 1000mL=1L (Answers for 1 and 2 are 440g and 7.30g so …

1. What is the mass of 32 x 10 23 nitrogen gas particles? 2. If 15.2 pg of water

1. What is the mass of 32 x 1023 nitrogen gas particles? 2. If 15.2 pg of water is dissociated from lithium carbonate pentahydrate, what amount of lithium carbonate pentahydrate w…

1. What is the mass of potassium in a sample of KClO 4 that contains 5.67 g of o

1. What is the mass of potassium in a sample of KClO4 that contains 5.67 g of oxygen? ______ g K 2. The compound X3Y is 65.6% X. What is the molar mass of Y if the molar mass of X…

1. What is the mass of sulfuric acid, H2SO4, in 25.0 mL of 12.0 M sulfuric acid?

1. What is the mass of sulfuric acid, H2SO4, in 25.0 mL of 12.0 M sulfuric acid? 2. If 25.0 mL of 0.150 M aluminum bromide reacts with 15.0 mL of 0.200 M silver nitrate, what mass…

1. What is the mass of water? 2. What is the total change in temperature? 3. Wha

1. What is the mass of water? 2. What is the total change in temperature? 3. What is the equation used to determine the heat flow? 4. What is the equation used to determine the he…

1. What is the mass percent composition of: Hydrogen in CH3OH 2. A car engine tu

1. What is the mass percent composition of: Hydrogen in CH3OH 2. A car engine turns gasoline into exhaust gasses is it aphysical or chemical. 3. Oxygen has a boiling point of -183…

1. What is the maximum mass of iron that can be obtained by the reaction of 65.2

1. What is the maximum mass of iron that can be obtained by the reaction of 65.25 g Fe2O3 and 25.96 g of H2? Fe2O3(s) + 3H2(g) -> 2 Fe(s) + 3H2O(g) 2. What is the percentage yi…

1. What is the maximum negative 2\'s complement number that can be represented u

1. What is the maximum negative 2's complement number that can be represented using a total of 5 bits? a) -31 b) -32 c) -15 d) -16 e) none of the above --------------- 2. A comput…

1. What is the molar mass of sodium chloride? 2. In an ionic reaction between su

1. What is the molar mass of sodium chloride? 2. In an ionic reaction between sulfate and calcium, the ratio of calcium to sulfate ions is what? 3. In balanced equation involving …

1. What is the molar solubility of calcium sulfate, CaSO 4 in pure water at 25 o

1. What is the molar solubility of calcium sulfate, CaSO4 in pure water at 25 oC? Note that KSP for CaSO4 is x 10 at 25 oC. IMPORTANT: Express your answer in scientific notation t…

1. What is the molarity (mol/L) of a potassium permanganate solution if 19.88 mL

1. What is the molarity (mol/L) of a potassium permanganate solution if 19.88 mL of it was used to titrate a 10.00 mL sample of a 0.1213 M sodium oxalate standard solution. 2. Wha…

1. What is the molarity of a nitric acid solution prepared by diluting 250.0 mL

1.     What is the molarity of a nitric acid solution prepared by diluting 250.0 mL of 6.00 M HNO3 to a total volume of 2.50 L? A) 0.0600 M B) 0.250 M C) 0.600 M D) 2.50 M E) 6.00…

1. What is the molarity of a sodium chloride solution, if 12.95 g of NaCl are di

1. What is the molarity of a sodium chloride solution, if 12.95 g of NaCl are dissolved in enough water to make 0.200 L of solution? 2.What is the molality of a sodium chloride so…

1. What is the molarity of a solution containing 0.525 mol of sucrose in 855 mL

1. What is the molarity of a solution containing 0.525 mol of sucrose in 855 mL of solution? (give correct units and sig figs) 2, Isotonic solution is a 0.15 M aqueous solution of…

1. What is the molarity of a solution in which 0.0300 moles of aluminum chloride

1. What is the molarity of a solution in which 0.0300 moles of aluminum chloride are dissolved in a total volume of 100.OmL? 2. how many grams of sodium iodide would you get if yo…

1. What is the molarity of a solution obtained by dissolving 8.156 g of KNOs in

1. What is the molarity of a solution obtained by dissolving 8.156 g of KNOs in some water and diluting to exactly 100 mL in a graduated flask? 2. How many grams of NaNO, are ther…

1. What is the mole fraction of O2 in a mixture of 5.07 g of O2, 7.16 g of N2, a

1. What is the mole fraction of O2 in a mixture of 5.07 g of O2, 7.16 g of N2, and 1.33 g of H2? 2. What is the mole fraction of N2 in a mixture of 5.07 g of O2, 7.16 g of N2, and…

1. What is the name of (CH 3 ) 4 N + Br - ? a) tetramethylamine bromine tetramet

1. What is the name of (CH3)4N+Br-? a) tetramethylamine bromine tetramethylamine bromide c) tetramethylammonium bromide d) tetramethylammonium bromine 2. Which of the following is…

1. What is the name of the compound shown? A) ethyl benzoyl ether B) ethyl benzo

1. What is the name of the compound shown? A) ethyl benzoyl ether B) ethyl benzoate C) 2-benzoylethane D) phenyl ethanoate E) none of these 2. Which is the structure of ethyl acet…

1. What is the name of the gold colored coating that is applied to drills and mi

1. What is the name of the gold colored coating that is applied to drills and milling cutters to make them last longer and do a better job of metal cutting? 2. What is the special…

1. What is the net ionic equation for the reaction between a strong acid and a s

1. What is the net ionic equation for the reaction between a strong acid and a strong base? 2. _______ is often utilized in reactions involving bleach. OCl2 Cl2 CO2 O2– 3. Oxidati…

1. What is the observed result of increasing the total pressure under isothermal

1. What is the observed result of increasing the total pressure under isothermal conditions in the following system initially at equilibrium? PCl3 (g) + Cl2 (g) <——> PCl5 (g…

1. What is the order of elution & explain. 2. Rank the pI values for the three h

1. What is the order of elution & explain. 2. Rank the pI values for the three hemoglobins from most acidic to least acidic Hb Kansas (Hb K) isa mutation of a asparagine to th…

1. What is the order of reaction with respect to A? 2. What is the order of reac

1. What is the order of reaction with respect to A? 2. What is the order of reaction with respect to B? below: The initial rate of the reaction A + 3B 2C + D was determined for di…

1. What is the osmotic pressure of a solution made by dissolving 85.0 g of gluco

1. What is the osmotic pressure of a solution made by dissolving 85.0 g of glucose, C6H12O6, in enough water to form 150.0 mL of solution at 42.0 C ? 2. What is the vapor pressure…

1. What is the oxidation number of the sulfur atom in Na 2 SO 4 ? So i know the

1. What is the oxidation number of the sulfur atom in Na 2 SO 4 ? So i know the answer is +6, guess my question is why? or how? can someone explain? 2. Which species functions as …

1. What is the pH of a 5.02×10 -2 M aqueous solution of ammonium bromide , NH 4

1. What is the pH of a 5.02×10-2 M aqueous solution of ammonium bromide, NH4Br ? 2. The substance formic acid (HCOOH) is a weak acid (Ka = 1.8×10-4). What is the pH of a 0.276 M a…

1. What is the pH of a buffer that is composed of 100. mL of 0.20 M NH 4 Cl and

1. What is the pH of a buffer that is composed of 100. mL of 0.20 M NH4Cl and 200. mL of 0.10 M NH3? 2. If an acetic acid/sodium acetate buffer solution is prepared from 100.0 mL …

1. What is the pH of a hypoiodous acid/sodium hypoiodite buffer in which the con

1. What is the pH of a hypoiodous acid/sodium hypoiodite buffer in which the concentration of the weak acid component is 0.129 M and the concentration of the conjugate base is 0.1…

1. What is the pH of a solution containing 23 grams of sodium acetate dissolved

1.     What is the pH of a solution containing 23 grams of sodium acetate dissolved in 1.0 L of  1.0 M HCl?  Is this a buffer? 2.     What is the pH of 1.0 L of a 0.1 M solution o…

1. What is the pH of a solution made by mixing 100.mL each of two solutions of H

1. What is the pH of a solution made by mixing 100.mL each of two solutions of HCl(aq), one with pH = 2.00 and one with pH = 3.00? 2. What volume of 0.150M NaOH is required to rea…

1. What is the pH of a solution that is 0.10 M HC2H3O2 and 0.20 M NaC2H3O2? Ka f

1. What is the pH of a solution that is 0.10 M HC2H3O2 and 0.20 M NaC2H3O2? Ka for acetic acid is 1.8x10-5. 2. Using Kb = 1.8x10-5 for NH3, or Ka = 1.8x10-5 for HC2H3O2 and 5.6x10…

1. What is the pH of a solution where [H3O+] is 3.5 x 10-5 M? 2. For the followi

1. What is the pH of a solution where [H3O+] is 3.5 x 10-5 M? 2. For the following reaction, which reactant is acting as an acid? H2O + HCO3- <-> OH- + H2CO3 3. A solid samp…

1. What is the pH of the solution in the anode compartment of the following cell

1. What is the pH of the solution in the anode compartment of the following cell if the measured cell potential at 25 C is 0.24 V ? Pt(s)|H2(1atm)|H+(?M)||Pb2+(1M)|Pb(s) 2. What i…

1. What is the pH of the solution obtained by mixing 50.00 mL of 0.1250 M HOAc a

1. What is the pH of the solution obtained by mixing 50.00 mL of 0.1250 M HOAc and 25.00 mL of 0.1000 M NaOH? 2. Calculate the pH of a solution prepared by mixing 10.0 mL of 0.500…

1. What is the partial pressure of nitrogen in a container that contains 5.82 mo

1. What is the partial pressure of nitrogen in a container that contains 5.82 mol of oxygen, 7.90 mol of nitrogen, and 5.85 mol of carbon dioxide when the total pressure is 621 mm…

1. What is the pressure in a 28.9- L cylinder filled with 40.0 g of oxygen gas a

1. What is the pressure in a 28.9-L cylinder filled with 40.0g  of oxygen gas at a temperature of 327K ? 2.A sample of gas has a mass of 38.6mg . Its volume is 220mL  at a tempera…

1. What is the primary problem in Information Retrieval (IR) and what is the obj

1. What is the primary problem in Information Retrieval (IR) and what is the objective of an IR system? For each of the Ingest steps discuss how decisions on it can affect the pri…

1. What is the product of the reaction between 3-octanol andKMnO4 a. 3-octanoic

1. What is the product of the reaction between 3-octanol andKMnO4 a. 3-octanoic acid b. 3-octanone c. 3-octene. d. 3-octanal 2. What is the product of the reaction between2-methyl…

1. What is the proper test to determine if lipids are present? a Benedict\'s rea

1. What is the proper test to determine if lipids are present? a Benedict's reagent test a Biuret test a Sudan III test an iodine test 2. What is the proper chemical test for dete…

1. What is the purpose of calibrating a pH meter? 2. For the first part of this

1. What is the purpose of calibrating a pH meter? 2. For the first part of this experiment, a sodium hydroxide solution was created and standardized. If no NaOH was available to c…