Chemistry Questions and Answers July 07, 2020

When Ibuprofen is given for fever to children 6 months of age up to 2 years, the total dose is 5 milligrams (mg) per kilograms (kg) of body weight when the fever is under 102.5 F. How much medicine would be usual for a 18 month old weighing 19 pounds (lbs) Given 1 kg 2.20 lbs. 5 points

Write the chemical formula showing the relationship between plants and oxygen, carbon dioxide and sugar. then write the chemical formula showing the relationship between animals and oxygen, carbon dioxide and sugar.

Fill in the blanks. A d complex is likely to be... and..... Select one O O O not coloured, diamagnetic not coloured, paramagnetic coloured, paramagnetic coloured, diamagnetic (It depends on the ligands),The complex Cr(NH3)6 has A 266 kJ mol. What colour of light does it absorb (Hint refer to the electromagnetic spectrum, shown below.) UV

B. Classify the following as organic or inorganic substance 1. sugar 2. leaf 3. aluminum foil 4. plastic 5. starch 6. sand 7. alcohol 8. wax 9. sodium chloride 10. oil

3 3.1 (a) (b) 3.2 (a) (b) 3.3 3.4 (a) (b) Question 3 Give the name and formula of the chief ores, for each of the following metals Copper Iron Consider copper and answer the following questions Give a major industrial application of copper metal. Explain why it is resistant to acid attack, but dissolves in aqua regia. 20 Marks Complete the

1) (1 points) Complete the following table of ionic compounds. Symbol of positive ion Symbol of negative ion Name Ammonium hydroxide Cobalt (III) oxide Ni CI Formula KSO3

What is a general name for the reaction type shown below a. Ligand substitution b. Oxidative addition PPh3 PhP c. Reductive elimination d. Disintegration Ph3P CI Pd CI PPh2 PhP PPh 2 PPh3 CI Pd CI

Which one of the following correctly shows the weak acid equilibrium for formic acid, HCOOH A) HCOOH(aq) H2O(l) HCO(OH) (aq) H(aq) B) HCOOH(aq) HCO(aq) OH (aq) C) HCOOH(aq) H2O(I) HCOOHz(aq) OH (aq) D) HCOOH(aq) H2O(I) HCOO (aq) H3O(aq)

3. (25 pts.) As an extension of 2, consider tropolone (1 below). Tropolone is a compound that can act as an acid by donating a proton (H) via attack by generic base B (path 1) to form anion 2. Tropolone also can act as a base by accepting a proton (from HB path 2) to form cation 3. tropolone 1 O path 1 HB path 2 2 3 HB a. Fill in any missing

Based on their molecular structure, pick the stronger acid from each pair of oxyacids. Explain your choice. MISSED THIS Read Section 17.10 a. HSO4 or HSO3 c. HCIO or HBrO b. HClO or HCIO d. CCI,COOH or CH3COOH

A sample of 12.5 g of FeO, reacts with 18.5 g CO to yield Fe and CO. The balanced chemical equation is FeO (s) 3 CO(g) Which substance is the limiting reactant O Fe0, CO Fe O co 2 Fe(s) 3 CO(g) What is the theoretical yield of Fe mass of Fe If the actual experimental yield for Fe is 7.82 g, what is the percent yield of Fe

A sample of NO decomposes according to the following equation 3 NO(g) 1 NO(g) 1 NO(g) An equilibrium mixture in a 10L vessel at 570 C, contains 0.0418 g of NO, 0.0258 g of NO, and 0.00712 g of NO. (a) Calculate Kp for this reaction at this temperature. Kp (b) What is the total pressure exerted by the equilibrium mixture of gases Ptotal atm.

Please refer to the five molecules shown below. H HO H A H H OH H HO HO B H H OH H H H. HO H HO H C H OH H OH HO H H D H OH H OH OH H H H HO H HO E OH OH H OH H Now that you are an expert in Fischer projections, which of the two molecules have (D) stereochemistry

Calculate the molality of each of the following solutions: (a) 29.4 g of sucrose (C 12 H 22 O 11 ) in 227 g of water, ________m (b) 8.13 moles of ethylene glycol (C 2 H 6 O 2 ) in 1913 g of water. _______ m

3. Describe how the natural release of SO by volcanos could trigger chlorine catalyzed ozone destruction in the stratosphere. In your answer, be sure to include the reaction by which HCI is converted to Cl radical. 4. Why would the conversion on the aerosol particles on NO5 to nitric acid increase the rate of chlorine activation 5. What is the

GAS LAW DIFFUSION AND GRAHAMS LAW . INTRODUCTION LABORATORY SIMULATION 1) Given that the molar mass of ammonia is 17.030 gmol, calculate the molar mass of hydrogen chloride using your Phase 5 (Longer Tube) Lab Data. Molar mass of HCI gmol,ALab Data C Experimental Setup Time elapsed (min) Distance between cotton balls (cm) Distance to cloud (cm)

a) Draw two additional resonance structures for the following compound that are equivalent in energy to the structure shown (Include any charges or lone pairs and use curved arrows to show the movement of electrons). (6 pts) b) Draw a resonance hybrid structure for this compound (include correct charges on atoms where applicable). (4 pts)

Provide a retrosynthetic analysis and a synthesis of amino acid D, using 3 chlorobenzaldehyde as one of your starting materials. You may also find it helpful to consider using a onecarbon synthon containing a nitrogen atom. CI D COH NH

How many grams of solid aluminum sulfide can be prepared by the reaction of 10.0 g of aluminum and 15.0 g of sulfur How much of the nonlimiting reactant is in excess

A line in the Lyman series occurs at121.53 nm. Calculate high for the transition. a) 5 b) 4 c) 3 d) 2 e) 6

Look at the molecule sphingosine. OH HO NH Which TWO statements correctly describe sphingosine OSphingosine serves as a backbone, like glycerol. The hydrocarbon chain of sphingosine is fully saturated. OSphingosine already contains one hydrocarbon tail. Sphingosine has a nitrogen group that forms peptide bonds. Sphingosine is an energy storage

You are a nurse and you have several patients that need treatment. Thank goodness you were taught how to manipulate gas laws in order to help the patients. Help each patient solve the issue they are encountering. How many moles of gas are in a helium tank that holds 22.4L, kept at room temperature and atmospheric pressure?

7. Complete the following reactions with the necessary products or reactants. Remember to account for any stereochemistry. 2 DDY HA NC 2 CN 3 CN COMe COMe Hint you will only use one of the pibonds in the alkyne. MICH Endo product Exo product

The hydrolysis of sucrose, C2H2O11, proceeds faster at higher temperatures. The rate constant at 85C is 0.145 min. From the starting concentration of sucrose given below calculate the molar concentration of sucrose after 15.0 minutes at 85C. DATA Starting concentration of C12H22011 0.281 mol L Report your concentration with 3 significant figures.

Sucrose is hydrolysed enzymatically to glucose and fructose in the human body. This reaction can also be carried out industrially with strong acid catalysis and first order kinetics has been established C2H22O11 (aq) HO(1) C6H2O6(aq) C6H2O6(aq) Sucrose glucose fructose Ratek C2H201 An experiment was conducted at 65C. Use the following

Calculate the change in enthalpy for the following reaction, using the appropriate standard enthalpies of formation given below. Ag0(s) HS(g) AgS(s) HO(A) 1 AH(Ag0(s)31.0 kJmol AHAgS(s) 32.6 kJmol AHHO()286 kJmol AHHS(g)20.6 kJmol

Suppose the galvanic cell sketched below is powered by the following reaction: Mn(s)+Ni (NO 3 ) 2(aq) Mn(NO 3 ) 2(aq.) +Ni(s) Write a balanced equation for the half-reaction that happens at the cathode of this cell. Write a balanced equation for the half-reaction that happens at the anode of this cell. Of what substance is E1 made? Of what

23. For the squareplanar complex Pd(bpy) (SCN)2 (bpy questions. bipyridine), answer the following (a) Give the IUPAC name for this species. (b) Determine the d configuration of the central metal. (c) Predict whether this compound has isomers. (d) Determine the crystalfield stabilization energy in units of Dq. (e) Calculate the spinonly magnetic

1. Download the structure of phosphofructose kinase, 3pfk, from the PDB databank. 2. Identify residues that are within 5A from two phosphate groups in the structure. Extract the picture of the 3D arrangement of these residues. 3. Based on the literature, identify the substrate binding site of pfk. Is the site hydrophobic or hydrophilic 4. Identify

1. Differentiate solubility and miscibility. 2. Discuss the principal factor that affects the solubility of a drug.

Synthetic rubber is an artificial elastomer. The first rubber polymer synthesized from butadiane was created in 1910 by the Russian scientist. Today, about 32 million metric tons of rubber are produced annually in the Unites States, and of that amount, two third are synthetic. (a) what is meant by synthetic rubber? (b) based on the data analysis,

A 0.10 mole fraction solution of urea, CO(NH2)2, in water has a density of 0.21 gmL. What is the molarity (M) of urea in this solution (Molar mass of urea is 60.06 gmol and molar mass of water is 18.01 gmol).

Explain in scientific terms, why the texture, flavour and aroma of cheeses change at different temperatures?

Gebruik Hess se Wet om die reaksiewarmte vir die proses te bepaal. Use Hesss Law to determine the heat of reaction for the process. CH4(g) 6HCl(g) 2CHCl3(g) 4H(g) i. 2C(s) 2H(g) CH4(g) AH 52.3 kJ ii. H(g) Cl(g) 2HCP(g) AH 184.6kJ iii. C(s) H(g) 32 Cl(g) CHCl3(g) AH 103.1 kJ

For which of the following reactions is the change in the enthalpy of the system equal to the change in the internal energy A. H reacting with O to form HO in a bomb calorimeter B. an aqueous solution of HCI reacting with an aqueous solution of NaH to form an aqueous solution of NaCl and H2 gas. C. CO gas reacting with solid NaOH to form solid

109. Solve each of the expressions for x using the quadratic formula and the x is small approximation. In which of the following expressions is the x is small approximation valid a. x(0.2x) 1.3 x 10 b. x(0.2x) 1.3 c. x(0.2x) 1.3 x 10 d. x(0.01 x) 1.3 x 104

2. A male adult of 27 years old and 165 pounds was found to have 1.37 gallons of boold in his body. How much is this blood volume in cubic centimeter (cc). Given 1 gallon 3.785 L and 1 L1000 mL and 1 mL1cc) 10 pts.

2. Zinc blend and wurtzite are the two important structures for semiconductors. Use ZnS as an example. a) Identify which crystal system they belong to respectively. b) Write the fractional coordinates of the cations and anions in each unit cell structure. c) Locate the cation octahedral sites (O) and tetrahedral sites (T or T.). d) Calculate the

What is the excited state electron configuration of 25Mn a. 1s 2s 2p 3s 3p 4s3d6 c. 1s 2s 2p 3s 3p 3d e. 1s 2s 2p 3s 3p 4s4d8 b. 1s 2s 2p 3s 3p 4s3d5 d. 1s2s2p 3s 3p 3d

The following is the spectrum of aniline in dms0d6 a. What is the source of the signal at 4.96 ppm b. What is the source of the signal at 2.48 ppm 002 969 6.53 6.52 6 4.96 Un 2.531 5 4 3 2.48 0.32 2 1 NH

Tabulated below are initial rate data for the chemical reaction 2Fe(CN)6 212Fe(CN)61 Run 1 2 3 4 5 Fe(CN) lo 0.01 0.01 0.02 0.02 0.02 o 0.01 0.02 0.02 0.02 0.02 Fe(CN) 0.01 0.01 0.01 0.02 0.02 lo Rate (Ms) 0.01 0.01 0.01 0.01 0.02 8 x 105 1x 105 2x 105 8 x 105 8x105 What is the value of k Write your calculations (stepbystep) on a piece of paper

6. For a particle on a ring, the Schrodinger equation can be written as d(o) 2m R d(0) Show that the energy can be written in terms of angular momentum using the angular momentum operator as shown below E Ev (0) L 21 Lih

4. a) Show that the Particle in a Box Wavefunctions are solutions to the Schrodinger Equation db(x) Ey(x) 2m dr (x) A sin(kx) b) What values of k are required for the equality to hold Note that the Schrodinger equation is written in terms of hbar or h2

Zn electrode 1 Zn (aq) (1 M) Salt bridge Fe2 A B I (aq) (1 M) The spontaneous reaction for this Voltaic cell is Zn (aq) Fe(s) Zn(s) Fe (aq) Reduction potential data Zn (aq) 2e Zn(s) 0.76 V Fe2 (aq) 2eFe(s) 0.44V 1.Calculate the Ecell (showing your working). 2.Describe the direction of electron flow when the reaction proceeds. Menu arrow

Calculate the pH for a 0.008 M (HNO3) solution. A. 1.40 B. 2.10 C. 12.60 D. 11.90 E. None of these

C. e D.

Great Star of Africa, a 530.4 carat diamond, C(diamond), is the largest clear cut diamond in the world. The stone is mounted in the Sovereigns Sceptre with Cross, If a carat is 0.200 g, how many atoms of C are contained in the Great Star of Africa. 1 carat 0.200 g

1. Provide a summary of the chemical hazards associated with 3pentanone. 2. Provide a summary of the chemical hazards associated with sodium borohydride. 3. Provide a summary of the chemical hazards associated with water. 4. Provide a summary of the chemical hazards associated with 3pentanol.,5. If a person were to ingest sodium borohydride what

A total of 30 kJmol of free energy is needed to synthesize ATP from ADP and Pi when the reactants and products are at 1 M concentrations and the temperature is 25C (standard state). Because the actual physiological concentrations of ATP, ADP, and Pi are not 1 M, and the temperature is 37C, the free energy required to synthesize ATP under

What mass in grams of CHOH (MM = 32.04 g/mol) would need to be added to 200.1 g of water in order to lower the freezing point of water by 12.0 C? (Kf for water is 1.86 C/m)

1)A 0.500 L hydrochloric acid (HCI) solution, which has a density of 1.10 gmL, contains 36 HCl by mass. Calculate the mole fraction of HC1. 2) A solution containing equal masses of NaCl and water has a density of 1.10gmL. Calculate the molality of the solution.

Separating 400 g (34 cup) of NaCl ion pairs from an initial separation distance of 2.8 A to Coulombs constant (9x10 NmC3), infinity. Note E f Fdr where F kq192k r2 qcharge (1 e has a charge of 1.6x109 C).

2. Identify the predicted multiplicity of the proton signal at the identified position a b a b a b b b OH a H a. a b a b

State whether each of the following (the ion, molecule, or the indicated atom in the molecule) could act as a nucleophile or an electrophile in a reaction. Write your answers above or below the ion or molecule. H H OH NH3 FC N CH3OH CH3NH2 HO

3. Assign the H NMR spectrum of acetophenone CDCI3 below 7.97 7.95 7.58 7.56 7.54 7.48 86 CO 8 TT 7 7 9 5 4 3 2.60 F818 2 d 1 C b B

Using the entropy change equation of the lattice model, calculate the change in entropy for the following mixtures. (a) 300 g of toluene and 200 g of methyl ethyl ketone (MEK) (7 points) (b) 300 g of toluene and 150 g of polystyrene with a molecular weight of 1.9 x 105 gmol (density 1.083 gcm) (9 points) and (c) 100 g of polystyrene (MW 1.5 x

Look at the image shown here. (b) is the parent compound. (a) and (c) differ only around 1 carbon atom. Therefore, they are Select a 1 CHO HO2CH 3 HOCH HCOH 5 HCOH CHOH b 1 CHO 1 2 HCOH 3 HOCH HCOH HCOH 6 CHOH C CHO 1 HCOH 2 HOCH HOCH 5 HCOH CHOH

If a container has a volume of gas measuring at 250 mL, a pressure of 2.1 atm and a temperature of 25 C, what will the new volume be in liters (L) when the pressure is changed to 3.5 atm and 45 C? Calculate the volume of a canister containing 25 moles of gas with a pressure of 3.4 atm and a temperature of 42 C R= 0.0821

Consider a fluid mixture that is described by ZeCP where c c(x, T) Q1. Derive an expression which gives the partial molar volume of substance i (V), in this mixture as a function of pressure (P), temperature (7), exponential factor (c), and the partial molar exponential factor (). Q2. Does this equation of state predict vaporliquid equilibrium

Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction n (products) . (reactants) where n represents the stoichiometric

Match the ligand MO depiction with the appropriate term and provide an example of a ligand known for this binding depiction a. donor b. odonor c. Tacceptor empty HOL filled empty filled filled empty Term Example

The following data give the vapour pressure (P) of water at various temperatures. We expect the vapour pressure to be related to temperature through the simple form of the Antoine Equation (which itself derives from the ClausiusClapeyron relation) log(P) A Use Excel to find the leastsquares line for the data, using log(P) as the dependent

25. Write clear structural formulas for the following complexes. (a) diamminetriaquahydroxochromium(III) nitrate (b) tetrakis (pyridine)platinum (II) tetraphenylborate (c) dibromotetracarbonyliron (II) (d) (e) tetraamminecobalt(III)uamidouhydroxobis(ethylenediammine) cobalt(III) chloride ammonium diamminetetrakis (isothionato) chromate (III)

Question 6 On abrading the stainless steel and the aluminium, how do the ranking change in the galvanic series O aluminium became more cathodic and stainless steel more anodic aluminium became more anodic and stainless steel more anodic O aluminium became more anodic and stainless steel more cathodic no real change in the galvanic series Question

6. The largest dam in the world is a straightcrested concrete gravity structure, the Three Gorges Dam is 2,335 m long with a maximum height of 185 m. It incorporates 28.0 million cubic m of concrete and 463,000 metric tons of steel into its design. Theoretically, a structure is to be built using the same amount of concrete used in the Three Gorges

Metal complex properties 6. What is the oxidation state at the metal and how many M delectrons are in each of the following complexes H H N. Photo Ru CI 1 Ox. State. dn PPh3 PPh3 Ox. State. dn

Instruction In the table below identify the conjugate bases that are also weak acids. Acid name Strong acid hydroiodic acid perchloric acid hydrobromic acid hydrochloric acid sulfuric acid chloric acid nitric acid Conjugate AcidBase Pairs Arranged by Strength Base formula Acid formula hydronium ion hydrogen sulfate ion hydrofluoric acid nitrous

A. Provide the correct observations and inferences for each of the following Procedure(s) 1. Egg albumin in a vial was heated strongly. 2. Aluminum foil on a broken crucible was heated strongly. 3. Drops of denatured alcohol and water placed on separate vials were evaporated. 4. Wax and sand placed on separate broken crucible was ignited. 5. Ethyl

For the first order reaction 2NOs(g) versus time data were collected at 45C and 65C Time(s) 4NO(g) O(g), the following concentration 0 100 300 600 T C NOs mol L 10.010 9.5410 8.6310 7.43x102 T65C NO5 mol L 10.0102 6.14102 2.33x102 0.54x102 From the above given data show how you will calculate the activation energy for the given reaction.

For the following reaction 3.15 g of water are mixed with excess chlorine gas. The reaction yields 8.56 g of hydrochloric acid. What is the theatrical yield of hydrochloric acid and grams? What is the percent yield of hydrochloric acid %?

3) (1 points) Using the electronegativity chart (figure 5.5), write the electronegativity difference and the bond type (ionic, polar covalent, nonpolar covalent) between the following pairs for elements a) H and As b) O and Rb c) Si and Se Difference Difference Difference Bond type Bond type Bond type 4) (1 points) Draw a Lewis structure for SeF2,

1. Identify the number of predicted H NMR resonances for each compound. OH H

How many moles of solid (NaOH) must be dissolved in 1 litre of water so that the solutions pH becomes 10.94 ABCDE B. C. D. E. 3.06 mol 1.1 x1011 mol 1.0 x1014 mol 8.7 x 104 mol none of these

a. Look up the structures in the CRC handbook and draw them below for each part performed today. b. Identify the intermolecular forces for each of the liquids drawn in problem 1. 2. Describe why there is a difference in the boiling points between 1propanol and 2propanol. 3. How might the boiling point of glycerol compare to 1propanol and why Be

"Fats are non-hydrocarbon compounds that can be obtained from animals and plants." what is meant by non-hydrocarbon compound?

Balancee las siguientes ecuaciones. a. CO,(g)HO(g) CHO(s)O(g) 77 b. SiO (s) C(s) SiC(s) CO(g) c.CH,(l)O(g) CO(g) HO(g) 7 d. Fe(s) HCl(ac) FeCl (ac) H.(g) e. PH,(g) NO(g) P,O, (s) HO(1) N.(g)

Turn your slope into a for every statement. For example, for liquid 1 the statement would be "The mass goes up 1.369 g for every 1 mL of volume." How much the mass goes up for every 1 mL of volume is defined as the density. Which liquid did you have? How do you know? What is the mass of your graduated cylinder? Turn your intercept into a

Display Curve Fit Uncertainties mass (g) Curve m Av B A 7.916 0.01573 B 807.7 0.8895 g RMSE 1.505 g

Design primers (8 bp long) to amplify the sequence excluding the bolded nucleotides. Split the two parental strands, show where the primers bind, show products after one cycle. 5-TTGACCATGTACATTACAGAATCCCATGCTAGCGGATCGATGCTAGCATT-3 3-AACTGGTACATGTAATGTCTTAGGGTACGATCGCCTAGCTACGATCGTAA-5

All matter is composed of what? -living organisms -energy -electrons -elements -molecules

1. Consider a solid circular disc of radius a lying in the xyplane with its center at the origin and carrying charge of density 47r Cm. Obtain the expression for the electric field intensity at the point (0,0,z). 2. A circular loop of wire of radius a is situated in the xyplane with its center at the origin. It carries a current I in the clockwise

The crowding-out effect occurs when: a. a. foreign investors crowd out U.S. investors in the market for loanable funds. b. a. the federal governments demand for loanable funds due to a higher budget deficit crowds out the private demand in the market for loanable funds. c. a. institutional investors crowd out individual investors in the market for

Hollings General Contractors is a general contracting company located in a medium-sized city in the Midwest. It is a family-owned business that has been in operation for 32 years. Its main focus is commercial construction in the range of $1 million to $5 million; its specialty is office buildings and smaller shopping centers. Paul Hollings, the

1) Draw a chair conformation of cyclohexane. Then, draw and level properly all axial and equatorial positions on chair form of cyclohexane. 2) Draw chair, halfchair and boat conformations of ethyl cyclohexane and draw an energy diagram to explain their relative stability 3) Draw two possible chair conformations for each of the monosubstituted

AY B 1 A 3 D 4 C 2 B D X Rank the vectors in the above diagram in order of increasing magnitude. Help on ranking problems You are correct. Your receipt no. is 1669070 Previous Tries Rank the vectors in the above diagram in order of increasing value of their x components. 2 D 3 B 4 A 1 C Submit Answer Incorrect. Tries 28 Previous Tries Rank the

what is the cell modification?

what are kidney cell modification

Complete the carbon cycle diagram by matching each process with the corresponding arrow. Atmospheric CO OF carbon fossilization decay of organic matter organic matter sediments deforestation photosynthesis burning fossil fuels animal respiration oceanic photosynthesis and respiration plant respiration 13 4

5. Give a short definition of the following terms (a) Organic Chemistry (b) Covalent Bonding (c) Saturated (speaking of organic molecules) (d) Isomer

An amount of solid KOH is dissolved in water and titrated with 0.450 M HCl requiring 18.50 mL of the HCl solution. What mass of KOH was dissolved?

1. Provide a stepwise synthesis for the following. (3 points) 2. Provide the mechanism for following reaction. (3 points) O 3. Provide the reagents necessary to carry out the following conversions. (6 points) COH NO HCI CI AICI, 4. Starting from benzene, show all required reagents and conditions needed to complete the following series of

The interconversion of L- -lysine and L- -lysine, for which at K c=7.20 at 333 K, is catalyzed by the enzyme lysine 2,3-aminomutase. At 333 K, a solution of L- -lysine at a concentration of 3.6010 3 M is placed in contact with lysine 2,3-aminomutase. What are the equilibrium concentrations of L- -lysine? WITH UNITS What are the equilibrium

166 T HOCCCCCCNH, II. LaLysine IIT Lysine 2,3aminomutase IL TI HOCCCCCCNH2 TIL 1BLysine

3. (20 points) the following AON network diagram is taken from 1(b) above (activity times are above the nodes). 5 18 2 13 3 4 10 5 11 8 2 9 a) Convert this AON network to an AOA network diagram (5 points) I b) Using forward and backward passes through the network, determine the early start, early finish, late start, and late finish for each of the

Solve for the pH of 0.250 M aqueous solution of NH4Br (NH3 Kb 1.8 105). 13.40 O9.07 11.33 O2.67 4.93 A

The following transactions and events for Stellar Corp. are being reviewed for possible adjusting entries at December 31 (the end of its accounting period). 1. Equipment used in operations cost 420,000 it was purchased on July 1, which was 3.5 years before the current December 31 yearend. It has an estimated useful life of 12 years. Straight line

Draw the correct mechanism for the first step of the reaction sequence. Just show the reactants and curved arrows. Do NOT show the products. Include lone pairs and formal charges. Only draw out acidic hydrogen with a covalent bond from the heteroatom from which the hydrogen are attached. CH3CHSH CH3O Edit A Draw the correct mechanism for the

Your Financial Advisor is selling you a product from which you expect to earn R3000 one year from now, R5000 2 years from now and R7000 3 years from now. i. ii. If the relevant discounted rate is 7, how much is this cash flow stream worth to you today (7 Marks) Would you buy this product for 10000 Justify your answer. (3 Marks)

Draw the neutral organic product that results from the following reaction. Include all hydrogen atoms. Hint: we are looking for a 3-carbon product.

CH,CH,CH OH(1) HSO (conc) 200C

Each of the statements below is an implication. In these statements, you may assume that A, B, and C are points, and m are lines, and x is a real number, all of which have been previously defined there are no implicit universal quantifiers in these statements. For each statement, do all of the following Identify the hypothesis and the conclusion.

For the following chemical reaction 2 HBrag) Ba(OH) (49) write the net ionic equation, including the phases. 2H O BaBr (aq)

Propose an efficient synthesis for the following transformation The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order, as a string of letters (without spaces or punctuation, such as EBF). If there is more than one correct solution, provide just