Chemistry Questions and Answers July 04, 2020

1- The primary reaction resulting from exposure to heavy metals would be (choose the best option): a) The neurotoxicity they produce b) Affectation of acetylcholinesterase c) The reaction of these with thiol groups in acetylcholinesterase 2- Side effects of xenobiotics are associated with (choose the best option): a) Favorable interaction with

1- You have a xenobiotic that is arranged from a secondary to a tertiary carbocation. (choose the best option): a) The increased stability may make it possible for the metabolite to attack DNA. b) The rearrangement has no effect. c) The stability of the metabolite is not increased.

Experiment 39 Prelaboratory Assignment Qual II. Ni. Fe, Alt, Zn2 Date Lab Sec. Name Desk No. 1. Identify the reagent (and its concentrion) that in ed to oliem e preence of ech of the towing . Fe 1.5M KNCS Crk ed salndis t) e Za 05 M KYE (CN Comg white ppris farmet) 2. Confirmatory tests for the varioun ions are oten oolorful. dentify the

Write a research paper on Plasma in detail Scope of Work: Edit for a single paper (smooth reading & understanding) including Tables of Contents, List of Figures, List of Tables and List of Abbreviations.

Solution Conductivity 1. A Conductivity Cell, has a resistance of 747.5 when filled with 0.01 M KCI solution and its resistance is 876 when it is filled with 0.005 M solution of CaCl2, both of which took place at 250C. Calculate the conductance specific for CaCl2 solution. 2. In the Hittorf method to determine the transport number of H and Cl

If you have a 10ml cylinder with a volume of 2.6ml. To determine the density of a gold ring, it is dropped on the test tube and it was observed that the water level increased s (what is observed in the image). Determine the density of the ring if it weighs 20.1 g and evaluate whether it is gold. The density of gold is 19.3gml ml 6

Take a 50ml test tube, then add 20ml. Immediately a silver ring weighing 5.3g is thrown at him, the water level rose to 20.5ml. Determine if the ring is silver. Silver density= 10.5 g/ml.

Identify and underline the amphoteric substances:

Conjugate, Pairs BASE cr NO HSO SO4 HPO Fe(HO),(OH) (OH) NO F Cr(HO),(OH) CHCOO AKHO),(OH) HCO3 2 SO3 HS HPO NH3 co PO 5 OH 0 NH ACID HC1 H HNO H HSO4 H HSO4 HPO4 Fe(HO)6 HNO HF Cr(HO)6 CH,COOH Al(HO) HO CO HSO3 HS HPO4 NH4 HCO3 HPO4 HS HO OH H NH, H

You are working at an engineering company called Muhendis, Inc.. Your boss, Kartal, asks you to evaluate two options for an investment project which would bring quantified benefits to your company. The project life is estimated as 5 years. Muhendis, Inc. wants to expand its production line by buying new machines and they have two options to choose

What is the pH of the analyte in a titration at the equivalence point when a 10.00 mL aliquot of 0.25 M HF( Ka = 3.5 x 10 -4 , pKa = 3.46) is titrated with 0.10 M NaOH? 8.23 8.15 7.00 5.85

Using DataVisulization Tools in R, create a script that will generate the given outputs. Upload your code. 160 Weight (lb) 140 120 58 60 American Women Aged 3039 62 64 66 Height (in) Prepared by Yourname 68 70 72

Using DataVisulization Tools in R, create a script that will generate the given outputs. Upload your code. Petal Lengths from Three Species of Iris 3 4 5 6 7 Petal Length 0.4 Density 0.2 0.0 1 2

Using DataVisulization Tools in R, create a script that will generate the given outputs. Upload your code. Car count in terms of Cylinder 6 8 Number of Cylinder Prepared by Yourname 12 Count 0 2 4 6 8

Using DataVisulization Tools in R, create a script that will generate the given outputs. Upload your code. Yearly Numbers of Important Discoveries 12 10 8 I 6 1900 1860 1880 1920 Year Prepared by Yourname 1940 M 1960

The chosen company for this assignment is: Fortescue Metals Group (FMG) Assignment Instructions and Requirements Part A (14 marks) Get and analyze financial statement of " Fortescue Metals Group (FMG)". ( It is available on google) Answer the question below: Based on your knowledge of accounting theories, identify one (1) disclosure each from two

Which of the following cannot cause oxidation of vitamin C O Higher temperature O Metal ion O Light O Dissolve oxygen O Alkaline O None of the given

Heme iron (Fe3) are normally from animal source that forms complex with protein. This form of iron is readily absorbable by the human body. O True O False

1 point Uses electromagnetic radiation for fast reaction Which of the following is not an advantage of microwave digestion O Green digestion procedure O Reduces sample lost O Less destruction to the sample O Automated

Reaction of ammonia with boric acid during protein distillation produces ammonia and Equation NH3 H3BO3 NH4 OHB04 O NHBO2 O H2BO O H2B03 O H3B02

In kjeldhal analysis conversion and reaction occurs from digestion to distillation and titration. Which compound in the entire reaction has the highest boiling point O NH3 O NaOH O H2SO4 O (NH4)2SO4

Most of the iron in the body can be found in the O Muscles O Blood O Bones O Liver

Type of ashing for mineral analysis that uses the combination of hotplate and furnace O Wet ashing O Microwave digestion O Dry Ashing O Oven digestion O Block digestion

Which of the following fatty acid is not synthesize by human body and required to be obtained from diet O Linoleic acid Linolenic acid O Arachidonic acid palmitic acid O Oleic acid arachidonic O Linolenic Oleic acid

can cause toxicoinfection, symptoms can are diarrhea and can cause acute renal failure and neurological problem. O E.coli O Salmonella O C. botulinum O C. perfringens (

Which of the following is not a spore forming bacteria O C. botulinum O C. perfringens O E.coli O Bacillus cereus O Campylobacter spp.

In Kjeldahl method in determining the protein content in food. What type of digestion is being used O Dry oxidation O Wet oxidation O Microwave digestion O Hotplate digestion

Amino acid responsible in the formation of collagen with the aid of vitamin C. O Histidine, alanine O Lysine, proline O Phenylalanine, alanine O Tryptophan, valine

By kjeldahl method, the nitrogen contained in a food stuff is converted into ammonia. If the ammonia from 5.0g of food stuff is just sufficient to neutralize 20ml of 0.098m sulfuric acid solution (density soln1.08gml)calculate the N. O 1.40 O 1.18 O 0.55 O 5.49 none of the given

What is the color of end point in the back titration of ammonia reacted with boric acid during analysis of protein by Kjeldahl method Pink Graying light pink Purple Blue Greenish

During the digestion of nitrogenous compound with sulfuric acid it form ammonium sulfate and when neutralized with sodium hydroxide if form (NH4)2SO4 2 NaOH 2 2H2O O NH3 and Na2SO4 NH4 and NaHSO4 O NH3 and H2SO4 Onone of the given

Which of the following is not a role of Ascorbic acid 1 Cofactor for numbers of enzymatic reaction Competitive inhibition in substrate reactions O Modulate Gastrointestinal absorption O Immunoglobulin suppressant O O O O O Antioxidant

Which of the following is not an biomarker of iron level in the body O Ferritin O Transferrin O Serum iron concentration O Total iron building capacity O Total iron in blood

Method use for the analysis of protein by which nitrogen is measured by thermal conductivity corrected to standard conditions and converted to mass equivalent. O Kjeldahl method O Dumas method ONIR O UVVIS Method

It is found out that during the analysis for crude protein 25ml of 0.101N HCI is used for the sample and 0.05 for the blank. Assuming the protein factor is 6.25 what is the crude protein for the remaining 75 of 2.00g sample. O 40.10 O 4.71 45.21 O 44.13

What is the color of a completely digested food sample for Kjeldahl method after subjecting to 420C and with the use of sulfuric acid and catalyst O Black O White O Greenish to blue O Yellowish

Vitamin C enhance absorption of Iron by keeping iron in ferric form. True O False

One of the disadvantages of atomic absorption spectrometer in determining minerals is that they uses different lamps specific to the element of interest. O True O False

In red meat pinkish color of the meat where iron is in the form of Fe2 and when oxidized it forms dark brown meat that oxidizes the iron to Fe3 O True O False

Instrument that can differentiate and qualify metals that can differentiate metal isotopes O ICPMS O AAS O UVVIS O Flame AA

What inner Gas is used in ICPMS in order to produce plasma of higher temperature O Nitrogen O Argon O Helium O Neon

Largest contributor to food safety hazard that can cause sickness to consumers O Virus O Chemical hazards O Physical hazard O Bacteria O Parasite

In Kjeldahl method the protein is determined indirectly by determining the amount of Nitrogen which can be prom protein and non protein nitrogen and uses 6.25 as protein factor for all types of food products. O True O False

Food that has to be kept at certain temperatures to minimize multiplication of any food poisoning bacteria that may be present in the food or to prevent the formation of toxins in the food. Food hazards Spoiled food Potentially hazardous food Perishable food

Prepared foods, when stored at normal condition or room temperature must be disregarded after 6hrs to prevent potential food poisoning. O True O False

Low pH food are more stable due to inhibition of growth of spoilage microorganism. The pH of the food must be. O 4.7 O 4.5 O 7.5 O 5.5 O None of the given

Identify the virus or parasite I am found in the soil I have been associated with rice I can produce two different types of toxins that cause illnessCooking food to required minimum internal temperatures can destroy me Giardia duodenalis Hepatitis A Visrus Bacillus cereus. Cryptosporidium parvum O Norovirus

7. A harmonic oscillator absorbs a photon of wavelength 8.65 x10 m when it undergoes a transition from the ground state to the first excited state. What is the groundstate energy, in electron volts, of the oscillator

3. Show that the reduced mass of two equal masses, m, is m2. 4. In the infrared spectrum of H1271, there is an intense line at 2309 cm 1. Calculate the force constant of H127 and the period of vibration of H1271. BOURGUNGSUNTLOMUNAUMIDINARNIR UUTTURNUTARTIRIGJURNITURI TEREXXXXa

5. Chemists use infrared absorption spectra to identify chemicals in a sample. In one sample, a chemist finds that light of wavelength 5.8 m is absorbed when a molecule makes a transition from its ground harmonic oscillator level to its first excited level. a. Find the energy of this transition. b. If the molecule can be treated as a harmonic

2. A classical harmonic oscillator with mass of 1.00 kg and operating with a force constant of 2.00 kg s 2 (2.00 J m 2) is released from rest at t 0 and x 0.100 m. a. What is the function x(t) describing the trajectory of the oscillator b. Where is the oscillating mass when t 3 sec c. What is the total energy of the oscillator d. What is the

swer the following and completely show your solutions. Good luck 1. A wooden block with mass 0.250 kg is oscillating on the end of a spring that has force constant 0.110 Nm. Calculate the groundlevel energy and the energy separation between adjacent levels. Express your results in joules and in electron volts. Are quantum effects important

For the following reaction, 0.205 moles of iron are mixed with 0.416 moles of oxygen gas. iron(s) oxygen (g) iron(II) oxide(s) What is the formula for the limiting reagent What is the maximum amount of iron (II) oxide that can be produced moles

For the following reaction, 0.571 moles of hydrochloric acid are mixed with 0.515 moles of oxygen gas. hydrochloric acid (aq) oxygen(g) water() chlorine(g) What is the formula for the limiting reagent What is the maximum amount of water that can be produced moles

Use the references to asp For the following reaction, 0.398 moles of phosphorus (P4) are mixed with 0.512 moles of chlorine gas. phosphorus (P4) (s) chlorine(g) phosphorus trichloride () What is the formula for the limiting reagent What is the maximum amount of phosphorus trichloride that can be produced moles

A buffer solution that is 0.461 M in HClO and 0.461 M in NaClO has a pH of 7.46. The addition of 0.01 mol of H3O to 1.0 L of this buffer would cause the pH to The capacity of this buffer fo be increased by the addition of increase slightly increase by 2 units decrease slightly decrease by 2 units not change Submit Answer Retry Entire Group A

Which of the following statements does not properly describe accounting for OPEB (other post-employment benefits) plans? Group of answer choices a. Losses related to OPEB arises from a decrease in the discount rate assumptions b. OPEB plans are deemed to be riskier than other debt instruments c. OPEB plans are mandatorily funded under the same

In the titration of 50 mL of a mixture containing 0.1040 M HCl and 0.1220 M CH3COOH with 0.1800 M NaOH, 15 mL of NaOH What will be the pH of the solution when it is added? (Ka= 1.8.10-5) for CH3COOH

The following reactions all have K 1. 1) C6H5COO (aq) HCIO (aq) C6H5COOH (aq) CIO (aq) 2) NO (aq) C6H5COOH (aq) HNO (aq) C6H5COo (aq) 3) HCIO (aq) NO (aq) CIO (aq) HNO2 (aq) Arrange the substances based on their relative acid strength. Clear All HCIO C6H5COOH strongest acid NO intermediate acid C6H5COO weakest acid CIO not a BronstedLowry

III Indicate where each of the species will begin to form. pM CaY 2 Volume of titrant, mL MgY 2 HIn 2 Caln Mgin

8) If the pl of amino acids with alkyl group side chains is 6.0, the pl of aspartic acid is A) larger than 6.0 B) equal to 6.0 C) smaller than 6.0 D) less than 0.0 E) additional info is needed

Steps of how to calculate number of protons and neutrons in an isotope

Write the detailed mechanism.

ci CO lonic liquids Organic bases CI

Q1 A reaction between A B at equilibrium 25C has a pressure B 2 times greater than A. Determine the value of the equilibrium constant if the reaction occurs at 80 C

1. Choose one of the following parameters in toxicology and indicate the recent findings in the form of a short literature review: a. Vaccine toxicity in the light of COVID-19. b. Novel Psychoactive Substances recent toxicological findings. c. Recent applications computational toxicology.

In the following: Establish the concentration in mg P per liter of: 1.) 25.3256 g of 90% pure monobasic Ammonium phosphate dissolved in 55 gallons. 2.) 25 mL of 1.8 N phosphoric acid dissolved in 5 gallons. 3.) 2.50 mL of a 1000 mg/L phosphate standard dissolved in 500 mL.

If I want to apply 2.5 mg K per square meter. To a land of 15 hectares. How many kilograms of 75% pure potassium pentoxide do I require? How many quintals are equivalent? If the price per pound is 7 cents. How many dollars is the investment?

A solution is prepared by dissolving 100.0 mg of CH3COONa in water followed by the addition of 20.0 mL of HCI 0.0300 M. The volume of the solution is then taken to 500.0 mL by further addition of water. Determine whether the addition of 50.0 mg of MgBr2 to the solution would cause precipitation of Mg(OH)2, whose solubility product is 5.61 1012.

The current auditor of CTT Company Limited (CTT), the largest property management group in Hong Kong, will resign after the nancial statements audit for the year ended 31 December 2021. Tony, a partner of Brilliant CPA Limited, hears that the quotations offered by other CPA rms on CTTs audit engagement for the year ended 31 December 2022 are at

A quantity of N2 gas originally held at 3.80 atm pressure in a 1.00 L container at 26.0C is transferred to a 10.0 L container at 20.0C. A quantity of O2 gas originally at 4.75 atm and 26.0C in a 5.00 L container is added to the 10.0 L container already containing the N2. a) Draw a diagram outlining this experiment, labeling the various quantities.

1. Select the conditions where solid solutes have the highest solubility in water. Select those that USUALLY apply. *Structural effects: The molecule should be ______ (highly polar, slightly polar , non polar) *Temperature: The temperature should be _______ (high , low) *Agitation: Agitating the solution ________ (increases, decrease, has no

What are the products of this glycoside bond forming reaction

OH D OH OH HO . OH OH OH OH OH H (Catalyst) H2O B E HO. OH OH C F OH

(d) Characteristically both Co and Dy magnetic ions exhibit significant magnetic anisotropy. Briefly describe a model for the number of dimensions the spins can be oriented in in such materials and why this would be expected to be observed.

For the following reaction, 5.38 grams of sulfuric acid are mixed with excess barium hydroxide. The reaction yields 11.8 grams of barium sulfate. barium hydroxide (aq) sulfuric acid (aq)barium sulfate (s) water (1) What is the theoretical yield of barium sulfate grams What is the percent yield of barium sulfate

For the following reaction, 6.76 grams of chlorine gas are mixed with excess bromine. The reaction yields 19.2 grams of bromine monochloride. bromine (g) chlorine (g) bromine monochloride (g) grams What is the theoretical yield of bromine monochloride What is the percent yield for this reaction

For the following reaction, 3.84 grams of oxygen gas are mixed with excess butane (C4H10). The reaction yields 2.42 grams of carbon dioxide. butane (C4H10) (9) oxygen (g)carbon dioxide (g) water (9) What is the theoretical yield of carbon dioxide grams What is the percent yield of carbon dioxide

Glassworks Inc. produces two types of glass shelving, rounded edge and squared edge, on the same production line. For the current period, the company reports the following data. Rounded Edge Squared Edge 9,400 Total 31,100 Direct materials 21,700 Direct labor 6,000 11,900 17,900 Overhead (300 of direct labor cost) 18,000 35,700 53,700 Total cost

In an ethical decision-making model, the first step is to: know how to protect yourself. look at the stakeholders involved. frame the ethical issue. determine all alternative actions.

1.(10) Defect level and fault coverage. Show that for a clustered fault distribution, if the required defect level is DL, then the fault coverage of tests should be T (B Af)(1DL)VBB Af x 100 percent where fis fault density, is fault clustering parameter, and A is chip area. 2. (20) Defect level and fault coverage. Using test data analysis a chip

_____ is a technique that can be used to separate DNA molecules on the basis of their size. a. Separation gradient. b. Electrophoresis. c. Selective sorting. d. Cloning. e. PCR.

If you were given two vials containing crystals of white solids, and told that one vial contains ethyl 4aminobenzoate, and the other vial contains acetanilide, how could you very quickly determine which chemical was in which vial (note a m.p. determination is not quick)

The addition of water at the start of the process in Dept. B of Mcdo Mfg. Co., increases the quantity by 5. The following data pertain to its production for March Quantity data In process, March 1 Transferred in 12,000 units, done 80,000 units In process, March 31 10,000 units, 25 done Cost Data P 17,735 In process, March 1 Breakdown Cost from

A 90kg person is sitting at sea level on Earth. Assume the earth is uniformly dense and spherical. Using the mass and radius of the earth, calculate the force of gravity acting on them using Newtons Law of Universal Gravitatio

How long will it take before the balance exceeds 10,000 Share FV 10000, PMT 100, i 0.024 0.002, n 12 1.0021 10000 100 002) 0.002 Divide both sides by 100(1.0) 100 1.0021 1.002 0.002 Multiply both sides by 0.002 0.2 10000 1 You make a payment of 300 at the beginning of each month into an account that earns 3.6 annual interest. How long will it

In 2018, which of the following children would have income taxed at trust and estate rates? a. A 9-year-old child with salary income of $1,000 b. A 12-year-old child with net unearned income of $3,200 c. A 13-year-old child with salary income of $12,000 d. All of the above e. A nonstudent, 19-year-old child with net unearned income of $12,000

In a displacement reaction, we a cation (either H or a metal cation) with an elemental metal (turning the metal into a cation and the original cation into its elemental form). To know whether a displacement reaction will proceed or whether there will be no reaction (N.R.), we need to consult the series. In a metathesis reaction, we swap a cation

solution is formed when the solute uniformly disperses oughout (or dissolves in) the solvent. The process can be scribed though three steps 1. separation of solventsolvent particles, 2. breaking of solutesolute particles, and 3. formation of solutosolvent interactions. e overall energy change for the solution process, A His sum of the enthalpies

76. Name the following H b. a. Br .

300 V voltmeter is specified to be accurate within 2% at full scale deflection. Calculate the absolute error and the percentage error when the instrument is used to measure a 120 V

1. A series RC circuit has a source voltage of 24 VAC and an impedance of 252 ohms. What is the circuit current? A. 95 A B. 0.095 A C. 9.5 A D. 0.95 A 2. A 0.015 micro arad capacitor and 0.125 microfarad capacitor are connected in parallel in a circuit. What is the total capacitance of this circuit? A. 0.135 microfarad B. 0.140 microfarad C. 0.110

Find the total power radiated by an antenna if the radial component of radiated Amsine power density is Pr r2

What is biochemistry? what are the branches of biochemistry?

An insulated horizontal cylindrical tank of 0.028m^3 volume is divided into two parts by a frictionless piston. The piston does not conduct heat. Initially, both gases are at 1.4 bar and 40 Celcius. Heat is supplied to airside by electrical resistance coils until the pressure of both gases reaches 2.8 bar. Calculate the final temperature of the

Determine the volume bounded by a sphere and an ellipsoid?

13 Find the values of b and c, or the relationship between b and c, for which the equations x 5y 4 and 2x by chave a a unique solution b an infinite set of solutions no solution

Explain the chemical reaction? How can this react why it is called a chemical reaction how do we know this?

Formulate at least 5 concepts Emile Durkheim then identifies the mechanical and organic solidarity of the said concepts.

Which point defect in crystals does not alter the density of the relevant solid? (Delhi) 2009

What are the Three precursors used for large-scale production of carbon fibers?

What I Can Do (PERFORMANCE TASK 8) Directions Draw a short comic, explaining the process of ionic bonding. Draw your answer on a separate sheet of paper. 2 3