Chemistry concepts and calculations

1. Solar energy can heat cold water for household hot water tanks. What quantity

1. Solar energy can heat cold water for household hot water tanks. What quantity of heat is obtained from solar energy if 150kg of water is heated from 15 degrees celsius to 50 de…

1. Solid ammonium sulfide is slowly added to 175 mL of a 0.334 M lead(II) nitrat

1. Solid ammonium sulfide is slowly added to 175 mL of a 0.334 M lead(II) nitrate solution until the concentration of sulfide ion is 0.0621 M. The percent of lead ion remaining in…

1. Solid chromium(iii) oxidereacts with dihydrogen sulgide gas to form solid chr

1. Solid chromium(iii) oxidereacts with dihydrogen sulgide gas to form solid chromium(iii) sulfide and water. a) Write the balanced chemical equation for the reaction. b) Calculat…

1. Solid cobalt(II) acetate is slowly added to 75.0 mL of a 0.0506 M potassium h

1. Solid cobalt(II) acetate is slowly added to 75.0 mL of a 0.0506 M potassium hydroxide solution. The concentration of cobalt(II) ion required to just initiate precipitation is M…

1. Solid silver nitrite is slowly added to 75.0 mL of a potassium chromate solut

1. Solid silver nitrite is slowly added to 75.0 mL of a potassium chromate solution until the concentration of silver ion is 0.0680 M. The maximum amount of chromate remaining in …

1. Solid urea, (NH 2 ) 2 CO, burns to give CO 2 ,N 2 , and liquid H 2 O. Its hea

1. Solid urea, (NH2)2CO, burns to give CO2,N2, and liquid H2O. Its heat of combustion is -632.2 kJ/mol. Balance the equation for combustion of urea, and calculate the heat generat…

1. Solution made by dissolving 6.73 grams of toluic acid in 119 grams of henzene

1. Solution made by dissolving 6.73 grams of toluic acid in 119 grams of henzene (f.p = 5.45°C, Kf =5.07°C/m) gave a freezing point of 3.00°C. What is the calculated molecular wei…

1. Solve (1 point): 2.345 +3.2 2. What is the density of an object that has a ma

1. Solve (1 point): 2.345 +3.2 2. What is the density of an object that has a mass of 8.24 g and displaces 4.6 mL of water when submerged in water (1 point)? 3. Describe what is a…

1. Solve for the pH of a solution that has 0.100 M HClO and 0.075 M NaClO. The K

1. Solve for the pH of a solution that has 0.100 M HClO and 0.075 M NaClO. The K­a­­ (HClO) = 2.9 X 10-8 2. If 0.01 moles of strong base was added to a 2.00 L of the solution desc…

1. Solve for y and report the answer to the correct significant figures and unit

1. Solve for y and report the answer to the correct significant figures and units. Refer to pages 10 to 14 in the lab manual. 2.633 g-2.1255 g 24.5 mo 2. A student in the lab was …

1. Solve for y and report the answer to the correct significant figures and unit

1. Solve for y and report the answer to the correct significant figures and units. Refer to pages 10 to 14 in the lab manual. 2.633 g-2.1255 g 24.5 mo 2. A student in the lab was …

1. Some fish live in a pond deep inside a cave, at sea level. The front portion

1. Some fish live in a pond deep inside a cave, at sea level. The front portion of the cave is home to thousands of bats. Respiration by the bats has altered the fractional compos…

1. Some modern cars do not come with an inflated spare tire. The tire is collaps

1. Some modern cars do not come with an inflated spare tire. The tire is collapsed and needs to be inflated after it is installed on the car. To inflate the tire, the car comes wi…

1. Stability of oil-soap-water mixture will be more in comparison to oil-water m

1.Stability of oil-soap-water mixture will be more in comparison to oil-water mixture 2.When 2 moles of magnesium sulfate is dissolved in 1000 grams of water, will give exactly sa…

1. Starting burette value. Part G Part H Part C.Part D. 0.1 M Part E. 0.1 M Part

1. Starting burette value. Part G Part H Part C.Part D. 0.1 M Part E. 0.1 M Part F0.1 M NaoH 0.1 M NaOH 0.1 MHCI to HCI to buffer HCI to buffer 0.1 M NaOHto bufter to buffer water…

1. Starting with 4.2 mL of acetic anhydride with a density of 1.082, how many gr

1. Starting with 4.2 mL of acetic anhydride with a density of 1.082, how many grams of acetylsalicylic acid (theoretical yield) can be made? Assume acetic anhydride is the limitin…

1. Starting with a 1M stock of NaCl, a researcher prepares a 100 mM working solu

1. Starting with a 1M stock of NaCl, a researcher prepares a 100 mM working solutions. The distillation factor is: 2. To prepare 50 mL of a 100 mM solution if NaCl, starting from …

1. State and Explain how each of these errors would affect (high, low, no change

1. State and Explain how each of these errors would affect (high, low, no change) your calculated values of solubility and Ksp. a) The saturated solution of Cu(IO3)2 is not filter…

1. State in words is meant by the solubility product equation for Ba(IO3)2: Ksp=

1. State in words is meant by the solubility product equation for Ba(IO3)2: Ksp= [Ba^2+] [IO3-]^2 2. If 10 mL 0.10M Ba(NO3)2 is mixed with 10mL 0.10 M KIO3 a precipitate forms. Wh…

1. State the difference between the three electrons in Li (Z-3)?. 2. Give the el

1. State the difference between the three electrons in Li (Z-3)?. 2. Give the electron configurations for the following elements: Na (Z-11), Ca (Z-20), Cr (Z-24), Cu (Z-29), Ga (Z…

1. State whether the H2O in each of the following chemical equations is acting a

1. State whether the H2O in each of the following chemical equations is acting as an acid or a base. 2. Write a balanced equation for each of the following neutralization reaction…

1. State whether the given changes will cause the equilibrium to shift toward th

1. State whether the given changes will cause the equilibrium to shift toward the reactants, products, or neither. Explain each answer. Ag2CrO4 (s) + heat -> 2Ag+ (aq) + CrO42-…

1. Student Q prepared 50.00 mL of a buffer solution using 0.50 moles of HA and 0

1. Student Q prepared 50.00 mL of a buffer solution using 0.50 moles of HA and 0.50 moles of A- while Student S prepared 50.00 mL of a buffer solution using 0.25 moles of HA and 0…

1. Students A, B, C, D and E are enrolled in a variety of different classes: A i

1. Students A, B, C, D and E are enrolled in a variety of different classes: A is taking English, Math, and Physics. B is taking History and Geography. C is taking Government, His…

1. Studetn performs a calibration experiment to determine the heat capacity of t

1. Studetn performs a calibration experiment to determine the heat capacity of the calorimeter. Student mixes 25.0 mL of warm water at 41.2 C and 35.0 mL of cool water at 15.1 C. …

1. Substances A2+, B2+ and C2+ are all in the same chemical family, and all form

1. Substances A2+, B2+ and C2+ are all in the same chemical family, and all form nitrate salts. In aqueous solurion, the nitrate salts of these cations are colorless and very solu…

1. Substances X, Y, and Z can all act as oxidizing agents. In this solution, X i

1. Substances X, Y, and Z can all act as oxidizing agents. In this solution, X is red, Y is green, and Z is blue. In the reactions they undergo they are reduced to X-, Y-, and Z-,…

1. Substances X, Y, and Z can all act as oxidizing agents. In this solution, X i

1. Substances X, Y, and Z can all act as oxidizing agents. In this solution, X is red, Y is green, and Z is blue. In the reactions they undergo they are reduced to X-, Y-, and Z-,…

1. Substances that have the same electron configuration are: a. isoelectronic. b

1. Substances that have the same electron configuration are: a. isoelectronic. b. lanthanides. c. ferromagnetic. d. paramagnetic. e. diamagnetic. 2 Light has a frequency of 7.21 ×…

1. Subtleties of significant figures. Circle the phrase (or value) that makes th

1. Subtleties of significant figures. Circle the phrase (or value) that makes the statement correct. a. For addition and subtraction, keep the ( maximum / minimum ) number of ( de…

1. Successful purification by recrystallization is based primarily on the solubi

1. Successful purification by recrystallization is based primarily on the solubility of a solute in a solvent. With the water solubility values given, which one or more of these s…

1. Sulfate (S042-) is typically determined by dissolving in H2O followed by prec

1. Sulfate (S042-) is typically determined by dissolving in H2O followed by precipitation as BaSO4 via addition of BaCl2. Calculate the percent (w/w) Na2SO4 (FW = 142.04) in an un…

1. Sulfhydryl groups have the ability to react with the alkylating reagent N-eth

1. Sulfhydryl groups have the ability to react with the alkylating reagent N-ethylmaleimide (NEM) in chemical modification experiments. When NEM is added to a purified solution of…

1. Sulfhydryl groups have the ability to react with the alkylating reagent N-eth

1. Sulfhydryl groups have the ability to react with the alkylating reagent N-ethylmaleimide (NEM) in chemical modification experiments. When NEM is added to a purified solution of…

1. Sulfur and fluorine form several different compounds including sulfur hexaflu

1. Sulfur and fluorine form several different compounds including sulfur hexafluoride and sulfur tetrafluoride. Decomposition of a sample of sulfur hexafluoride produces 0.327 g o…

1. Sulfur dioxide (SO 2 ) is a gas that is a polluant responsible for acid rain.

1. Sulfur dioxide (SO2 ) is a gas that is a polluant responsible for acid rain. It can be formed by the following reaction:                H2S (g) + O2 (g) SO2(g) + H2O(g)   (unba…

1. Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ? SO2Cl2(g) Kp

1. Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ? SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L…

1. Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ? SO2Cl2(g) Kp

1. Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ? SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L…

1. Sulfur hexafluoride, SF6, is a gas that a potent greenhouse gas and electrica

1. Sulfur hexafluoride, SF6, is a gas that a potent greenhouse gas and electrical insulator. If a 265.0 g sample is collected at 825.3 torr and at 13.7°C, what volume does this sa…

1. Sulfuric acid and aluminum hydroxide react as follows: (balance the equation)

1. Sulfuric acid and aluminum hydroxide react as follows: (balance the equation) __H2SO4 + __Al(OH)3 --> __H2O + __Al2(SO4)3 a. If 4.57 moles of sulfuric acid and 6.57 moles of…

1. Sulfuric acid is diprotic that will completely ionize to give two protons whe

1. Sulfuric acid is diprotic that will completely ionize to give two protons when placed in with a strong base like potassium hydroxide. Write a balanced equation for the reaction…

1. Suppose 50.00 mL of 2.0 × 10–4 M Fe(NO3)3 is added to 50.00 mL of 2.0 ×10-6 M

1. Suppose 50.00 mL of 2.0 × 10–4 M Fe(NO3)3 is added to 50.00 mL of 2.0 ×10-6 M KIO3. Which of the following statements is true? For Fe(IO3)3, Ksp = 1.0 × 10–14. A) A precipitate…

1. Suppose I told you that I was working with a chemical called 3-methylbutane.

1. Suppose I told you that I was working with a chemical called 3-methylbutane. However, you are highly skilled at naming organic compounds and you tell me that 3-methylbutane is …

1. Suppose a packet is going on the Internet starting from Host A traveling to H

1. Suppose a packet is going on the Internet starting from Host A traveling to Host B, and there are four routers it must cross on the path between A and B. How many interfaces wi…

1. Suppose a radioactive isotope has a half-life of tu/2 22 days. How long will

1. Suppose a radioactive isotope has a half-life of tu/2 22 days. How long will it take for a sample of the isotope to decay to 25% of its original activity? a. 0.0315 days b. 0.0…

1. Suppose a reaction mixture, when diluted with water, afforded 300 mL of an aq

1. Suppose a reaction mixture, when diluted with water, afforded 300 mL of an aqueous solution of 30 g of the reaction product malononitrile, CH2(CN)2, which is to be isolated by …

1. Suppose atom 1 has the same number of protons as atom 2, and atom 2 has the s

1. Suppose atom 1 has the same number of protons as atom 2, and atom 2 has the same number of neutrons as atom 3. Atom 1 does not have the same number of neutrons as atom 3. Which…

1. Suppose num1 and num2 are int variables and symbol is a char variable. Consid

1. Suppose num1 and num2 are int variables and symbol is a char variable. Consider the following input: 47 18 * 28 $ What value (if any) is assigned to num1, num2, and symbol afte…

1. Suppose that S is regarded as a function of P and T Show that TdS = CP(delta)

1. Suppose that S is regarded as a function of P and T Show that TdS = CP(delta)T - (alpha)TVdP where (alpha) is the thermal expansion coefficient. 2. A process involving a perfec…

1. Suppose that a 3.00 mL aliquot of the product mixture was titrated with 0.25

1.       Suppose that a 3.00 mL aliquot of the product mixture was titrated with 0.25 M NaOH and required 35.07 mL to reach the endpoint. a)      What is the concentration of acet…