Chemistry concepts and calculations

3. What is the formal charge on the oxygen and carbon atoms in the structures be

3. What is the formal charge on the oxygen and carbon atoms in the structures below? H-o-CH, Your working out (note: student must show the working out, such as valence electron, b…

3. What is the oxidation number of Se in K SeO? A) -6 B) +6 C)+I D)44 E) -2 4. W

3. What is the oxidation number of Se in K SeO? A) -6 B) +6 C)+I D)44 E) -2 4. Which of the following solutions is a good buffer system? A) a solution that is 0.10 M HCH,0, and 0.…

3. What is the pH of the resulting solution after 150 mL of a 3.2 M sodium hydro

3. What is the pH of the resulting solution after 150 mL of a 3.2 M sodium hydroxide solution is mixed with 4.0 mL of a 4.0 M vinegar solution? 4. In the above question is the aci…

3. What is the percent dissociation of 0.10 M phenol? (The Ka value for phenol i

3. What is the percent dissociation of 0.10 M phenol? (The Ka value for phenol is 1.3 x 10-10) 3. Sodium hypochlorite (NaOCI, 74.44 g/mol) is a common ingredient in household blea…

3. What is the standard cell potential for the spontaneous reaction between thes

3. What is the standard cell potential for the spontaneous reaction between these two half cells? 3e Al 1.66 V Ag' e-Ag E 0.80 V 24. The series of figures shows the reaction 2A Pr…

3. What mass of the compond CrO 3 (M=100.0) conatins 4.5 x 10 23 Oxygen atoms? 4

3. What mass of the compond CrO3 (M=100.0) conatins 4.5 x 1023 Oxygen atoms? 4. An 18.5 g sample of tin (M=118.7) combines with 10.0 g of sulfur ( M=32.07) to form a compound. wha…

3. What three things can an atom do with its electrons in order to satisfy the o

3. What three things can an atom do with its electrons in order to satisfy the octet rule? 4-What is the smallest difference in electronegativity (EN) between atoms that would ind…

3. What volume (mL) of 0.663M potassium hydroxide aqueous solution is needed to

3. What volume (mL) of 0.663M potassium hydroxide aqueous solution is needed to neutralize [?this means to completely react with] 842 mL of 0.554M nitric acid? 4. 6. For each of t…

3. What would be the products in the overall ionic equation for the following re

3. What would be the products in the overall ionic equation for the following reaction? 2HBr(aq) + 2KOH(aq)-> products 1·K'(aq) and Br (aq); ll. KH(aq); Ill. H2O(l); lV. KBr(s)…

3. When (1R,2S)-1-bromo-2-methylcyclohexane is heated with sodium methoxide in m

3. When (1R,2S)-1-bromo-2-methylcyclohexane is heated with sodium methoxide in methanol, the major product is A) 1-methylcyclohexene. B) (R)-3-methylcyclohexene. C) (R)-4-methylcy…

3. When 6.6 g of compound X (MW = 66.6g/mol) was burned in a constant-volume bom

3. When 6.6 g of compound X (MW = 66.6g/mol) was burned in a constant-volume bomb calorimeter, the water temperature rose from 20.00 oC to 26.66 oC. If the mass of water surroundi…

3. When acetylene, C 2 H 2, burns in oxygen, high temperatures are produced that

3. When acetylene, C2H2, burns in oxygen, high temperatures are produced that are used for welding metals. 2C2H2 + 5O2 --> 4CO2 + 2H2O . How many grams of carbon dioxide are pr…

3. When collecting the hydrogen and oxygen gases, the collection bulb is initial

3. When collecting the hydrogen and oxygen gases, the collection bulb is initially filled with water. What happens to the water as the gas is collected? (Review the procedure.) 4.…

3. When collecting the hydrogen and oxygen gases, the collection bulb is initial

3. When collecting the hydrogen and oxygen gases, the collection bulb is initially filled with water. What happens to the water as the gas is collected? (Review the procedure.) 4.…

3. When solid tin comes in contact with the oxygen in the air,solid tin (IV) oxi

3. When solid tin comes in contact with the oxygen in the air,solid tin (IV) oxide is formed. a. Write a complete balanced equation from the reaction (showratio) b. A piece of tin…

3. When the spacing between translational energy levels is small compared to the

3. When the spacing between translational energy levels is small compared to the thermal energy (kBT), classical mechanics is a good approximation for quantum mechanics. Consider …

3. Which gaseous product(s) in the above reactions is (are) flammable? 4. Consid

3. Which gaseous product(s) in the above reactions is (are) flammable? 4. Consider the balanced equation for the reaction of magnesium metal with hydrochloric acid. (a) Calculate …

3. Which ion(s) precipitate upon addition of the weakly basic ammonia solution?

3. Which ion(s) precipitate upon addition of the weakly basic ammonia solution? 4. In this experiment, the choice of precipitating reagent is important. Briefly explain what the c…

3. Which ion(s) precipitate upon addition of the weakly basic ammonia solution?

3. Which ion(s) precipitate upon addition of the weakly basic ammonia solution? 4. In this experiment, the choice of precipitating reagent is important. Briefly explain what the c…

3. Which of the following acids below is best for the preparation of a buffer wi

3. Which of the following acids below is best for the preparation of a buffer with a pH of 4.00? (a) H,so, (ka-1.7x10-2) (b) HF (Ka-6.9 x10-4) (c) HC,Hso, (Ka-6.6 x 10-5) d) H,PO …

3. Which of the following complex ions has the smallest d-orbital splitting ener

3. Which of the following complex ions has the smallest d-orbital splitting energy (A)? (a) octahedral [OsClo] (b) tetrahedral [OsCl4] 4. Which of the following complex ions has t…

3. Which of the following compound(s) is/are present in Box 1? Select all that a

3. Which of the following compound(s) is/are present in Box 1? Select all that apply. C D E F G H None of the above 4.Which of the following compound(s) is/are present in Box 2? S…

3. Which of the following compounds is most soluble in water? Which compound is

3. Which of the following compounds is most soluble in water? Which compound is least soluble? CH3CH2CH2OH CH3CH2CH2NH2 CH3CH2CH2CH2CH2OH CH3CH2CH2CH2CH2NH2 Most soluble: ________…

3. Which of the following graphs (A,B,C,D] correctly represents the relationship

3. Which of the following graphs (A,B,C,D] correctly represents the relationship between the pressure and the volume of an ideal gas that is held at constant temperature? A balloo…

3. Which of the following is NOT true about Grignard reagents? They include a me

3. Which of the following is NOT true about Grignard reagents? They include a metal directly bonded to a carbon. They are organometallic compounds. They consist of a highly polar …

3. Which of the following scenarios best describes conditions on Earth during th

3. Which of the following scenarios best describes conditions on Earth during the Hadean? Continents were covered with soil and land plants were beginning to develop. Most life wa…

3. Which of the following shows the correct order for steps in the Fischer ester

3. Which of the following shows the correct order for steps in the Fischer esterification mechanism: A. proton transfer, nucleophilic attack, proton transfer, proton transfer, los…

3. Which of the following statements best describes the charges on amino acids a

3. Which of the following statements best describes the charges on amino acids at neutral pH (around 7)? A. Each amino acid contains a positively charged amine and a negatively ch…

3. Which of the following statements is TRUE for gases? i. The temperature of a

3. Which of the following statements is TRUE for gases? i. The temperature of a gas is inversely proportional to its pressure. ii. The volume of a gas is directly proportional to …

3. Which of these pairs of liquids is likely to be miscible? A. H,O and C,H B. H

3. Which of these pairs of liquids is likely to be miscible? A. H,O and C,H B. H,O and CH,OH C. CH,COCH, and GaHh 4. Explain why water is a worse solvent for wax than carbon tetra…

3. Which of these pairs of liquids is likely to be miscible? A. H,O and C,H B. H

3. Which of these pairs of liquids is likely to be miscible? A. H,O and C,H B. H,O and CH,OH C. CH,COCH, and GaHh 4. Explain why water is a worse solvent for wax than carbon tetra…

3. Which one of the following statements about photophosphorylation is false ? A

3. Which one of the following statements about photophosphorylation is false? A. It can be uncoupled from electron flow by agents that dissipate the proton gradient. B. The differ…

3. Which one of the following statements is false?@5pts a.) Carbon tetrachloride

3. Which one of the following statements is false?@5pts a.) Carbon tetrachloride, CC14 is more miscible with hexane, C6H14 than it is with a polar solvent like methanol, CH30H. b.…

3. Which reaction mechanism can be represented by the fllowing energy diagram? A

3. Which reaction mechanism can be represented by the fllowing energy diagram? A An S 2 reaction only. B An Swl or an SN2 reaction. C An El or an E2 reaction. D An Ssl or an El re…

3. Which reaction mechanism can be represented by the fllowing energy diagram? A

3. Which reaction mechanism can be represented by the fllowing energy diagram? A An S 2 reaction only. B An Swl or an SN2 reaction. C An El or an E2 reaction. D An Ssl or an El re…

3. Which statement about a chemical reaction is not correct? a. All chemical rea

3. Which statement about a chemical reaction is not correct? a. All chemical reactions are reversible since products can be converted back into the reactants. b. If a reaction is …

3. Which statement below correctly describes the responses of alpha, beta, and g

3. Which statement below correctly describes the responses of alpha, beta, and gamma radiation to an electric field? A) Both beta and gamma are deflected in the same direction, wh…

3. Which statement below correctly describes the responses of alpha, beta, and g

3. Which statement below correctly describes the responses of alpha, beta, and gamma radiation to an electric field? A) Both beta and gamma are deflected in the same direction, wh…

3. Which statement below regarding covalent bonds is F a. Electrons in a single

3. Which statement below regarding covalent bonds is F a. Electrons in a single covalent bond are mutually attracted to two nuclei. b. The average bond length is the distance betw…

3. Which statement is not consistent with the information contained in the phase

3. Which statement is not consistent with the information contained in the phase diagram of a compound? A. Liquids can be made to boil by raising the pressure at constant temperat…

3. Which statements below are TRUE for enthalpy and entropy? Enthalpy is the hea

3. Which statements below are TRUE for enthalpy and entropy? Enthalpy is the heat flow, q, under constant applied pressure. Standard conditions for entropy and enthalpy changes ar…

3. Which variable(s) in the rate law (rate k [I [BrO [H\' may be affected by a c

3. Which variable(s) in the rate law (rate k [I [BrO [H' may be affected by a change in concentration of the reactants? 5. Which variable(s) in the rate law, rate [ [BrO]" [H , is…

3. Why is the dielectric constant a significant parameter for solubility? 4. For

3. Why is the dielectric constant a significant parameter for solubility? 4. For each of the following pairs of solures and solvent, predict whether the solute would be soluble or…

3. Why it is invalid to ask for the first row in a relational table. (10 pts) 4.

3. Why it is invalid to ask for the first row in a relational table. (10 pts) 4. Give a relational database schema for a department-student database. Every department has a unique…

3. Write a C program that reads the value of angle x in radians (360 degrees = 2

3. Write a C program that reads the value of angle x in radians (360 degrees = 2 radians) then calls a function sin to find the sine trigonometric function by evaluating the follo…

3. Write a program to create a table of radius values and corresponding volumes

3.   Write a program to create a table of radius values and corresponding volumes for a sphere. In function main prompt the user to enter the starting value of radius values (in c…

3. Write a subroutine to do the multiplication , of arbitrary sized multi-dimens

3. Write a subroutine to do the multiplication , of arbitrary sized multi-dimensional matrices. The input to the program should be: a. The multidimensional matrix (Al, the maximum…

3. Write an intStack interface that describes the abstract data type of a stack

3. Write an intStack interface that describes the abstract data type of a stack of int values. Assume you have a class MyIntStack that implements this interface (you do not need t…

3. Write down the complete molecular equations for each of the above reactions.

3. Write down the complete molecular equations for each of the above reactions. CIRCLE the precipitate (if any), and put a SQUARE BOX around the gas (if any). Then balance the equ…

3. Write half-reactions that show how H2O2 can act as either an oxidizing agent

3. Write half-reactions that show how H2O2 can act as either an oxidizing agent or a reducing agent, and describe where each of these situations occurred in your testing. 4. In yo…