Chemistry Questions and Answers July 01, 2020

For which of the following reactions isS>0. Choose all that apply.2SO2(g)+O2(g)2SO3(g)NH4I(s)NH3(g)+HI(g)2H2S(g)+3O2(g)2H2O(I)+2SO2(g)CH4(g)+H2O(g)CO(g)+3H2(g)4NH3(g)+5O2(g)4NO(g)+6H2O(g)

Susan recently completed a degree in accounting and was recruited by as an assistant accountant in a private firm. Her supervisor gave her a worksheet to calculate activitybased costs, which will be used in calculating the price of products. Susan entered costs for various activities as well as nonfinancial data for relevant activity drivers. She

Find an equation for the line that is described, and sketch the graph. Write the final answer in the form y = mx + b.

(d) Has xintercept 3 and slope 34 3 4x b y No Selution x 10 Submission Data L 20 23 (e) Passes through (3, 1) and (4,4) M 10 19 16 7 6 16 4 1 2 J 4 4 10 Clear All Delete 5 Fill WebAssign, Graphing Tool x Graph Layers Line 1

Explain the meaning of each of the following. (a) lim f(x) 0 X4 The values of f(x) can be made arbitrarily close to 4 by taking x sufficiently large. The values of f(x) can be made arbitrarily large by taking x sufficiently close to (but not equal to) 4. O F(4) The values of f(x) can be made arbitrarily close to 0 by taking x sufficiently close

Name Of Experiment lonexchange resins and chelometric titrations Q1 Purpose of experiment Q2 Introduction

Name of experiment Gas Chromatography (GC)Separation of alcohols Q1Purpose of experiment Q2Introduction

23 Which pyrimidine listed below is able to hydrogen bond pair with more than one different purine in RNA. A) Adenine B) Guanine C) Inosine D) Thymine E) Uracil F) B D E,13. Which purine(s) is(are) able to hydrogen bond pair with more than one different pyrimidine in RNA. A) Adenine B) Guanosine BD C) Cytosine D) Inosine IN Pur A, C, U E)

Suppose that f is a function given as f(x) 3x 5x 2. Simplify the expression f(x h). f(x h) Simplify the difference quotient, f(xh)f(x) h f(ah)f(x) h The derivative of the function at a is the limit of the difference quotient as h approaches zero. f(ah)f(x) h f(x) lim A0

Name of Experiment Determination of the formula of a complex by 1 Moleratio method 2 Continuous variation method Q1 Purpose of experiment Q2 Introduction

What is wrong with this fortran code? starting with 10 dollars at 10% return over 30 years i should have how much money? !This program calculates the amount of money you would get on this day and time in exactly 30 years !if you save a given amount of money, at a constant annual rate of return. !Variable Definitions: !InitialAmount: money you are

4. Prove that for n 2, 3, 11 212 .3 1(n 1)n 1 (1n)

What is colloid? Write down the properties of colloids.

Define molarity. What is the molarity of a solution prepared by dissolving 1.575 g of pure Na2CO3(M.W. =106) in 200mL of solution?

When a closed system is doing 64 kJ of work, 22 kJ of heat is extracted. If the system is then restored to its initial state by doing 28 kJ of work on the system, determine the heat involved in the restoration step of the system (in kJ).

The periodic table can be used to count the protons, electrons, and neutrons of atoms using the atomic mass and atomic number. Note the periodic table can be used to count the protons, electrons, and neutrons of isotopes and of ions of atoms as well. For this question, provide the number of electrons, neutrons, and protons for the following The

For Experiment 3 in Chem 255 Lab, students need to extract the fat trimyristin from the common cooking spice nutmeg before it can be converted to myristic acid. A student was able to extract 2.65 g of trimyristin from a 15.00 g sample of the nutmeg. This student then went on to use 1.35 g of the trimyristin (MW 723.2 gmol) and 15 mL of 2M NaOH to

c) A planned flexible loaded area is to be 3 m x 4.5 m and carries a uniformly distributed load of 180 kNm2. on a bed of saturated normally consolidated clay extended to a great depth. Estimate the elastic settlement below the loaded area. Assume Df 1.0 m, PI25 and Undrained strength 50 kNm2. d) A steel Hpile is driven by a hammer. The maximum

Experiment name Heat of Combustion of benzoic acid and Naphthalene in Bomb Calorimetry Q1Purpose of experiment Q2Theory Q3Discusion Please explain the solution in detail for each question

A molecule with the molecular formula C11H12N2O2 (relative molecular mass = 204.23) crystallized to form monoclinic crystals with a=18.899 , b=5.7445 , and c=9.309 , with =101.776. The crystal density is 1.371 g/cm3. Calculate the unit cell volume. Deduce the number of molecules per unit cell (expected values are between 2 and 8). Show your

Use Glycogen breakdown is an important process for freeing up stored glucose. Identify three points where the signal can be terminated once epinephrine is no longer present and briefly describe how each works. BIOCHEM

the mechanism for this hydrogenation?

NHA H CH3 CH3 PdC catalyst Ethyl Cinnamate Ethyl 3phenylpropanoate

The firstorder reaction of decomposition of azomethane is given below CH3NNCH3(g)N2(g)C2H6(g) At a certain temperature, the rate constant for this reaction equals 2.75 x 103s1. Calculate the halflife of this reaction(in seconds) at the same temperature.

The mass spectra of organic compounds contain a small peak at an m/z value one unit greater than that of the molecular ion. State what is responsible for this peak. State the information that can be obtained from the ratio of the height of this peak to the height of the molecular ion peak.

What is the splitting pattern of the highligted carbon in C13 NMR CGMU 2020 (CH3)2CHCH2CH20H Selected Answer a, triplet

5. Write three or four clear descriptions of the topography of Skull Mesa, located just east of the center of the map.,Name Worksheet 2A2 (cont.). If you were standing on top of Twin Hills in the northcentral part of the quadrangle and wanted to hike to Golden Gate Mountain, in the westcentral part of the map, determine which way would be the

To differentiate between Catabolism and Anabolism, fill out the blanks in the table below. Copy the table below in your answer sheet and put your answers in the blank spaces. Features that generally distinguish them Generally oxidative or reductive Catabolic pathways Anabolic pathways Result in conversion of complex molecules into simple compounds

Sucrose can enter glycolysis by either of two routes Sucrose phosphorylase Sucrose P, fructose glucoselphosphate Invertase Sucrose H,O fructose glucose Would either of these reactions offer an advantage over the other in the preparation of sucrose for entry into glycolysis Explain your answer. (2 Pts)

What would be the consequences of a Mg^2+ lon deficiency for the reactions of glycolysis?

Discuss the health property of tea in terms of inhibition of starch digestions. What chemical entities and enzymes are involved? What is the health benefit from such action?

What are the iron binding sites in polyphenols such as quercetin and catechin. How does iron binding by polyphenols provides antioxidant, antibacterial and anticancer effects?

When an uncoupler is present, will oxygen still be reduced to H2O Explain. When an uncoupler is present will ATP still be produced Explain.

Catechin gallate enters the systemic circulation largely unmodified, thus the interest in EGC and EGCG in research as they retain their biological and chemical activities How does the chemical transformation of polyphenols lose their antioxidant and/or biological activities?

Lipid oxidation is a chain reaction. What is its reaction profile? What is the effect of an antioxidant on a lipid oxidation profile? Discuss in terms of initiation, propagation, and termination phases

Flavonoid undergoes Phase II metabolic conversion as it passage through the small intestinal enterocytes and the liver before it is delivered to the general circulation to be available for use by the body. What is Phase II metabolism? What are the polyphenolic metabolic products that can be formed? What is this effects on the polyphenol

Describe the reducing antioxidant activity of quercetin. What are the structural features in quercetin that contribute to this activity. Describe the metal-chelating antioxidant activity of quercetin. What are the structural features in quercetin that contribute to this activity.

How does catechin modulate glycemic level? Indicate the digestive enzymes and glucose transporter it acts on.

What are hydrolysable and non-hydrolysable tannins? What chemical features distinguish them?

Briefly discuss the processing of tea to produce white, green, oolong, black & Puer teas. what changes occur in these processes? are these chemical or microbiological changes? which tea processing contains both? What is the role of polyphenol oxidase in the production of various tea products: green, orlong, black and pue-er tea.

How does iron binding by polyphenols provides antioxidant, antibacterial and anticancer effects?

If the sample holder is left open during the absorbance measurement of volatile solutions, 1 the value of measured absorbance will be higher than the expected value. Select one True False Pressure and temperature of a gas are 2 a. No definite relationship b. Exponentially related c. Inversely proportional d. Directly proportional In an open

Experiment name Effect of the ionic strength on solubility of benzoic acid in water. Q1) Discusion Q2) Theory Q3) Purpose

Boiling point elevation (AT) for 0.1M solution of NaCl is a. Equal to that of 0.1 M sugar solution b. Higher than 0.1 M sugar solution c. Lower than 0.1 M sugar solution d. Higher than 0.1 M CaCl2 solution Consider the chemical equilibrium below. Aa 3Bra) 2 Cig If The volume of container is doubled, the equilibrium Will 2 O a Shift to the right

K, must be equal to Kc for the equilibrium below Hz 2 s 2HI Select one True False 2 Not all equilibrium constants are dimensionless Select one O True O False All closed chemical reactions have no net change in concentrations at equilibrium Select one True False

Experiment name lon exchange resins and chelometric titrations Q1 Discusion Q2 Purpose of experiment Q3 Introduction

Describe how this dried product is often different from a crystallized product. (Describe the two different products on a molecular level.)

Anthocyanidin changes color with the change in pH from acidic to basic, and vice versa. What is the chemical bases for this change?

What is the unique proanthocyanidin in cranberry? What unique biological activity it processes that led us to be interested in it? Cranberry processes this activity but not other berries like blueberry or strawberry. What could be the reason?

Cranberry also processes antimicrobial activity against Staphylococcus aureus , a bacteria that causes sore throat and other illness. What is the probable antimicrobial mechanism?

Isoflavones are weaker antioxidants than anthocyanidins. What could be the reason?

What does it mean to say "isoflavone processes oestrogenic activity". How does this translate into a health effect?

At 60 KPa, what temperature will water would boil B. 86 C A. 22C C. 100 C D. 101.3 C

Q3 Selfcheckout machines provide a mechanism for customers to pay for purchases from a shop without direct input to the process by the shops staff. Create a class called Checkout for performing checkout service in a shopping mall. Use char variable to represent the item, unsigned long to represent the barcode, float variables to represent the

Draw the Haworth Projection structures for alpha- and beta- glucose, mannose, galactose & fructose.

Draw the chair and boat pyranose conformation structure for glucose?

Draw the furanose conformation structure or fructose?

Explain the existent of different tautomeric forms of glucose and fructose in solution, and which are the predominant tautomeric forms

What are the sugar compositions, linkages and linkage forms (alpha or beta) for sucrose, maltose, isomaltose and lactose?

For aGlcA p [1-3]GalNAc p Name the 2 sugars What are the sugars' conformations Which is the reducing sugar Which is the non-reducing sugar Which carbon atoms of the sugars are involved in the glycosidic bond What is the anomeric linkage of the glycosidic bond What is the anomeric linkage of the reducing sugar

For the lactose shown Name two sugars What are the sugars' conformations Which is the reducing sugar Which is the non-reducing sugar Which carbon atoms of the sugars are involved in the glycosidic bond What is the anomeric position (alpha or beta)

Cyclohexane, C6H12, undergoes a molecular rearrangement in the presence of a catalyst to form methylcyclopentane, CH3C5H9, according to the equation C6H12 CH3C5H9 If Kc 0.143 at 25C for this reaction, find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.075 M, respectively. C6H12 0.241 M,

25.7 The composition of a liquidphase reaction 2 AB was followed by a spectrophotometric method with the following results tmin 10 20 30 40 00 B(mol L1) 0.089 0.153 0.200 0.230 0.312 Determine the order of the reaction and its rate constant.

Define BOD, COD and DO.

What is acid rain? How it is formed? Explain it with chemical reaction.

1. What is primary and secondary standard substance? 2. What do you mean by iodimetry and iodometry?

Why KMnO4 is not a primary standard substance? Explain it.

20mL of an HCl solution is required for neutralization of 10mL 0.1M Na2CO3 solution. Calculate the strength of the HCl acid.

1.What is the hybridization in the central atom of: a. HCN b. NH4 c. TeBr2 2. Draw the molecular orbital electron configuration energy diagram of He2 and determine the bond order. 3. Draw the molecular orbital electron configuration energy diagram of O2 and determine the bond order. 4. Determine the molecular dipole moments for the following