Chemistry Questions and Answers April 29, 2020

Write the formula for cesium periodate

1. Write the formula for cobalt (II) phosphide QUESTION 7 1. Write the formula for silver nitride QUESTION 8 1. Write the formula for lead (IV) carbonate QUESTION 9 1. Write the formula for zinc phosphate QUESTION 10 1. Write the formula for cesium periodate

Is the compound MGF2 covalent or ionic I Name it QUESTION 2 Is LizSO3 ionic or covalent Name it QUESTION 3 Is NH4F ionic or covalent Name it QUESTION 4 Is Ag,SO4 ionic or covalent Name it QUESTION 5 1. Is Cu(ClO3)2 ionic or covalent Name it

Is CSCH3CO2 ionic or covalent Name it QUESTION 7 Is rubidium dichromate ionic or covalent Write its formula QUESTION 8 s copper m suhde soric or covaent write its formula QUESTION 9 Is vanadium (II) phosphate ionic or covalent Write its formula QUESTION 10 1. Is silver sulfite ionic or covalent Write its formula

QUESTION 11 Is calcium permanganate ionic or covalent Write its formula QUESTION 12 Is carbon tetrafluoride ionic or covalent Write its formula QUESTION 13 Is dinitrogen tetrahydride ionic or covalent Write its formula QUESTION 14 Is sulfur tribromide ionic or covalent Write its formula QUESTION 15 1. Is B2H, ionic or covalent Write its name

Question 1 Is the compound MgF 2 covalent or ionic [a] . Name it [b] Question 2 Is Li 2 SO 3 ionic or covalent ? [a] Name it [b] Question 3 Is NH 4 F ionic or covalent ? [a] Name it [b] Question 4 Is Ag 2 SO 4 ionic or covalent ? [a] Name it [b] Question 5 Is Cu(ClO 3 ) 2 ionic or covalent ? [a] Name it [b] Question 6 Is CsCH 3 CO 2 ionic or

Question 9 Is vanadium (II) phosphate ionic or covalent ? [a] Write its formula [b] Question 10 Is silver sulfite ionic or covalent ? [a] Write its formula [b] Question 11 Is calcium permanganate ionic or covalent ? [a] Write its formula [b] Question 12 Is carbon tetrafluoride ionic or covalent ? [a] Write its formula [b] Question 13 Is dinitrogen

A sample of ideal gas at room temperature occupies a volume of 27.0 L at a pressure of 202 torr. If the pressure changes to 1010 torr, with no change in the temperature or moles of gas, what is the new volume, V 2? Express your answer with the appropriate units. Part B If the volume of the original sample in Part A ( P 1 = 202 torr, V 1 = 27.0 L )

A sample of gas in a balloon has an initial temperature of 37C and a volume of 1560 L. If the temperature changes to 82C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas? in liters? What Celsius temperature,T2 , is required to change the volume of the gas sample in Part A ( = 37 , = 1560 T1=37C,

This figure (Figure 1)shows a container that is sealed at the top by a movable piston. Inside the container is an gas at 1.00 atm, 20.0 C, and 1.00 L. This information will apply to all parts of this problem A, B, and C. ideal Figure View Available Hint(s) HA Value Units

The industrial production of nitric acid (HNO3) is a multistep process. The first step is the oxidation of ammonia (NH3) over a catalyst with excess oxygen (02) to produce nitrogen monoxide (NO) gas as shown by the unbalanced equation given here NH3 (g)02 (g)NO(g)H20(g) ,Part A What volume of O, at 004 alg nd 39 Cs requred to syrthesize 190 ol of

1. A volume of 18.0 L contains a mixture of 0.250 mole N2 , 0.250 mole O2 , and an unknown quantity of He . The temperature of the mixture is 0 C , and the total pressure is 1.00 atm . How many grams of helium are present in the gas mixture? 2. A gas sample has a unknown pressure with a temperature of 51 C . The same gas has a pressure of 2.96 atm

Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 2.28 bar when it is sitting on a shelf at 23 o C . If the can is placed on top of the furnace where the

What volume of O2 at 760. mmHg and 23 C is required to synthesize 25.0 mol of NO Express your answer to three significant figures and include the appropriate units. Hints volume of O2 759 L 3D Submit My Answers Give Up All attempts used correct answer displayed You have caulated the theoretical volume of O, needed to produce 25.0 mol of NO.

How many air molecules are in a 4.053.663.05 m3 room? Assume atmospheric pressure of 1.00 bar, a room temperature of 20.0 C, and ideal behavior? Express your answer numerically in litres.

A 1.00 L flask is filled with 1.05 g of argon at 25 C. A sample of ethane vapor is added to the same flask until the total pressure is 1.26 atm . What is the partial pressure of argon, PAr, in the flask? What is the partial pressure of ethane, Pethane, in the flask? Express your answer to three significant figures and include the appropriate units.

The maximum amount of ealcium chromate that will dissolve in a 0.132 M calcium nitrate solution is

If 1.00 mol of argon is placed in a 0.500-L container at 26.0C , what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation)? For argon, a=1.363L2 bar mol2 and b=0.03219L mol1. Express your answer to two significant figures and include the appropriate

Calculate the pH during the titration of 25.00 mL of 0.1000 M HCN(aq) with 0.1000 M KOH(aq) after 12.37 mL of the base have been added. Ka of hydrocyanic acid 4.9 x 10 10 (value 0.02)

Need structure from data

121 79.3 1994 8.07. 7. 7.4 7. proton carbon 13 1.4

Directions From a certain soy sauce product you notice labels of different ingredients and amounts contain. In your science activity notebook, list down the common compounds and elements present in the said product and its uses. Uses Product Label Compounds Ingredients water, hydrolyzed naturally soybean iodized salt, caramel as color, sodium

An amount of drug was dissolved in 100ml water the drug decomposes by zero order kinetics the concentration after two month was 192mg/ml and the concentration after 10 months was 160 mg/ml calculate a.initial concentration

How many grams of NaCl should be used in compounding the prescription ,Dipivefrin HCI Scopolamine HBr 13 NaCI 3. Rx q.s. 30 Purify. H20 ad Make isoton. Sol. Sig. Usie in Eye

Show mechanism of H 2 O 2 or hydrogen peroxide

3. Predict which test or tests will be positive for each of the compounds listed in the lefthand column, Mark () to indicate a positive test, Predicted Positive Test Results Compound Ceric Nitrate Test Silver Nitrate Test Tollens 2,4DNPH Test Bromination Test Test a. CH,COOH b. HCHO c. CH,CH Br d. CH,(CO)CH, e. CH,CH,CH,CH, f(CH,),NH g. CH, COOH

2. Calculate the energy threshold for producing Cherenkov light in water (n 1.333), air (n 1.000293) and helium (n 1.000036) for electron, proton and a particles. Over what ranges of energy could you cleanly identify these three particles using a system of three threshold Cherenkov detectors filled with water, air and helium 3D

Draw the structure of the following compounds. (a) 2,3-dimethylhexane (b) 4-isopropyl-2,4,6-trimethylheptane (c) 2,2-dimethyl-4-propyloctane (d) 4-isobutyl-2,5-dimethyloctane 2. Give the systematic name for each of the following compounds:

The following data are for the decomposition of dinitrogen pentoxide in carbon tetrachloride solution at 30 C. NO5 2 NO2 0 NO5 , M time, min 0.576 0 0.288 116 Hint It is not necessary to graph these data. (1) The half life observed for this reaction is (2) Based on these data, the rate constant for this min 0.144 232 min. order reaction is

1. Draw a schematic diagram of crystal structure of LiCoO 2 . Show your working. (2 marks) 2. What kind of the hybridization is formed between cobalt and oxygen atoms? Show your working. (2 marks) 3. What kind of the bond can be found in the LiCoO 2 formed by cobalt and oxygen atoms? Show your working. (2 marks) 4. Write the reaction between LiCoO

Write the condensed formula for dichloromethane. 3. a. Construct a model of ethane with two carbons connected together and the remaining six posi- tions with hydrogens. Draw the full structural formula for ethane. b. Notice that you can twist the model of ethane around the carbon carbon bond so that the hydrogens on one carbon rotate successively

H H. H. H O

A sample of 10.00mL of the acid HC2H3O2 was titrated with a solucion of naOH 0.100M, below is the graph: Calculate:a) pH at the equivalence point b) pH at the midpoint of neutralization c)pKa d)Ka

PH 12 Volume NaOH (mL) 10 R

Zinc and sodium metal each react with sulfuric acid according to the following equations. Zn(s) HSO4 (aq) ZnSO4 (aq) H(g) 2 Na(s) HSO4 (aq) NaSO4 (aq) H(g) A 25.81 g mixture of zinc and sodium is reacted with a stoichiometric amount of sulfuric acid. The reaction mixture is then reacted with 2.30 10 mL of 2.13 M barium chloride to produce

If you have 0.150 M trypotphan (pKb2 11.63 pKa2 9.33) in the intermediate form (HA) answer the following questions. What is the pH of the solution Your Answer Answer Question 10 (8 points) Refering back to Question 9 to answer the following question. What are the concentrations of H2A, HA, A

A Carnot cycle consists of legs. y two isothermal and two isobaric O to isothermal and two constant volume two isothermal and two adiabatic two isobaric and two adiabatic QUESTION 11 The thermodynamic criterion for a spontaneous process is O ASsurroundings0 O AG 0 O 45sys 0 O ASuniverse O QUESTION 12 A constant entropy process follows an O

Draw the molecular shape of SeCl 2 . Make sure to use solid wedge and dash bonds if needed.

3 3 1 3 3 3 6 3 3 3 5 10 Data (work) experiment (1) Height of Sample 0.569 g Flask lover 79.0389 790389 Temp. of bath 37152 369k Barometric preshere 762.762 mmHg 762.762 mmilty T 15 of flask Sample lover 79.607 g Volume 278 ml (12) 0.8649 79.9029 278ml,Calculations As outlined in the introduction, calculate the number of moles of sample

Aldehydes are more reduced than carboxylic acids. O False True

4. Draw the arrow pushing mechanism for the following reaction HO HSO. and Water CH3

Ionic compounds differ from molecular compounds because the ions completely separate from each other shown below is an equation for reaction to make sodium chloride from na solid and chlorine gas true or false 2na(s) cl2(g) 2nacl(s)

Which statement about the shown reaction is correct 1. anti addition, forming a geminal dialcohol 2.syn addition, forming a geminal dialcohol 3.anti addition, forming a vicinal dialcohol 4.syn addition, forming a vicinal dialcohol 5.none of the statements makes any sense

Synthesize the following carbonyl compounds from benzene, materials containing 3 or less carbons, and any necessary solvents and inorganic reagents. (b) CHO (d)

6. Nuclear reactions allow us in principle to achieve the dream of the medieval alchemists, namely, to change other metals into gold. For example, bombarding a target of Hg with a proton beam can covert the 200Hg into 197Au by the reaction p 280Hg a 19 Au Natural mercury has an atomic mass of 200.59, i.e. Avogadros number of mercury atoms

6. Nuclear reactions allow us in principle to achieve the dream of the medieval alchemists, namely, to change other metals into gold. For example, bombarding a target of Hg with a proton beam can covert the 200Hg into 197Au by the reaction p 280Hg a 19 Au Natural mercury has an atomic mass of 200.59, i.e. Avogadros number of mercury atoms

Flow inside annular spacing is widely used in heat exchangers for various applications in thermal fluid sciences. Suppose that a laminar flow condition is valid inside the annular spacing and the velocity profile within the annular spacing is defined with the following equation u(r) Variable R. (mm) R. (mm) (kgms) ApL. (kPam) Ap 4L R p. RR Ro

Esters (i) aliphatic RCOR M weak but observable note M gets less intense as the alcohol portion ( ) increases in size e.g. C4 very weak. MR M OR 0 RCOR RCOR Which peaks in the MS of methyl butanoate and methyl benzoate are due to these types of fragmentation Account for the peak at mz 74 in the methyl butanoate MS.,Esters Relative Abundance

16. A coal burnt in a power plant has the following analysis. The power plant engineer would like to know the coal rank and feed rate (short tonsh) of as fired (based on as determined analysis with ash and moisture) for a 300 MW (thermal) boiler. The moisture is reported to be 6.5. (60 Points) Proximate Analysis, wt. Volatile matter 1.7 Fixed

Hydrochloric acid could be used to neutralize barium hydroxide. If you have 0.519 L of a 2.66 M barium hydroxide solution, how much 9.45 M hydrochloric acid (in L) will be required to neutralize it? 2 HCl (aq) + Ba(OH)2(aq) BaCl2(aq) + 2 H2O(l)

(b) Estimate the energy difference between the stable and unstable chair conformations of each of the following tetramethylcyclohexanes. Which is more stable isomer Me Me (i) (ii) .. Me ..Me Versus Me. Me Me Me

How many mL of 0.1 M HCl must be added to 100 mL of 0.1 M F- to prepare a buffer solution that has a pH of 3.05? Ka= 6.810^-4. please write it out on paper. i know you need to use pH=pKa+log(conj. base/acid). I do not know what to plug in for conjugate base and the acid.

50.00 mL of 0.010 M Cu2 is titrated with 0.050 M EDTA at pH 9. Which of the following is true when 20.00 mL of titrant is added Note K the conditional formation constant for the CuY2 complex. All of these are true O pCu pK log Cu2 pK O pCu log K

Propose structures: 1. Sudan blue reacts with water 2. Sudan blue reacts with HCL 3. Sudan blue reacts with H20

What is the IUPAC name of the following substance CH3CH2

50.00 mL of 0.010 M Cu2 is titrated with 0.050 M EDTA at pH 9. Which of the following is true when 20.00 mL of titrant is added Note K the conditional formation constant for the CuY2 complex. All of these are true O pCu pK log Cu2 pK O pCu log K

Based on the LD 50 of these chemicals, which chemical would you use to control mosquito larvae populations Defend your answers by providing sound reasons as to why your chosen chemical is better than the others

Write the IUPAC Name of the following structure

Given the national ambient air quality standard (NAAQS) for ozone (O3) is 0.08 ppm or parts per million on a volume basis. Using the Ideal Gas Law (PV = nRT, with R = 0.082 L-atm/mol-K): (a) Express that standard in ug/m3 at 1 atm pressure and 25C temperature. (b) At the elevation of Denver, the pressure is about 0.85 atm and temperature is 12C.

a) While recrystallizing, what should you do if you have solid particles that dont dissolve even after adding a lot more hot solvent than called for in the procedure? b) What should you do if your crystals dont come out of solution even after cooling on ice, adding a seed crystal, and scratching for quite a while?

Calculate the theoretical yield of 2,3dibromo3phenylpropanoic acid starting with 2.56g of transcinnamic acid (TCA). a. What volume of 1.2M bromine in acetic acid is required to fully convert the starting mass of TCA to 2,3dibromo3phenylpropanoic acid when using a 10 excess of the bromine acetic acid solution b. Given that calculated volume of 1.2M

Which of the following is NOT chemical change O a. bicycle rusting b. antacid neutralizes stomach acid OC. salt being mixed with water O d. silver discolor in open air

3. You may find the information of two machines below new machine 40,000 7,000 2,000 38,000 used machine 25,000 8,000 Machine First Cost Annual Operation Cost Overhaul every 5 years Salvage Value Life, Years Which machine is recommended if interest rate is 10 per year ( any method(20 mins). 4,500 6

Which of the following alcohols would dehydrate the fastest when heated with acid CH3 CH CH3 CH2OH OH OH HO A D. B.

117. mg of an unknown protein are dissolved in enough solvent to make 5.00 ml of solution. The osmotic pressure of this solution is measured to be 0.0878 atm at 25.0 C. Calculate the molar mass of the protein. Round your answer to 3 significant digits.

The Johnson Corporation manufactures cellular modems and routers in twa divislans. The company currently manufactures the drcult board for the modems. The Smith Corporation, a rellable mnaufacturer, has offered to supply droult boards to the modems division in 2018. Cost data is provided below. current year next year 2017 2018 volume ( circuit

9. Predict the major product of the following reaction CH OK, CH.OH Methyl Vinyl Ketone, heat

Why do you like penicillin? Why is it important? Please keep your answer under 200 words.

What do we need to pay attention in using a UV-Vis spectroscopy for quantitative analysis in terms of sample, cuvette, wavelength selection, absorbance range, and calibration curve?

For the following questions, identify the ions comprising the salt, and then use the expression for the solubility product to perform the necessary calculations. This simple exercise involves the assumptions that you can ignore any complications which might result as a consequence of the basicity or acidity of the ions, ion pairing, complex ion

What do you think the energy diagram for an electron in a low energy level looks like? Draw a representation that shows an electron in a H atom that is in a low energy level. Then explain your drawing and provide any other information that you were not able to include in your representation.

Binding data in methanol are given below for a series of interactions between crown ethers 36 and cations. 3 5 6 Log K (Li) 0.5 Log K (Na) 1.73 Log K (K) 0.86 Log K (Li) 1.42 Log K (Na) 3.42 Log K (K) 3.38 Log K (Na) 4.32 Log K (K) 6.10 Log K (Cs) 4.62 Log K (K) 4.41 Log K (Cs) 5.02 (i) suggest an explanation for the selectivities

A student needs 15.0g of ethanol for an experiment. If the density of ethanol is 0.789 g/cm3 , how many millilitres of ethanol are needed?

Provide the IUPAC name for the compound below.

Which of the following is the Banomer of Dgalactose CHO HCOH HOCH HCOH CH2OH CH,OH OH O. OH OH CH,OH OH OH CH2OH O OH OH OH OH CH,OH OH OH OH pone of there

The correct order of the key components of a financial plan is a). investing, financing, insurance, budgeting b). financing, insurance, budgeting, investing c). budgeting, financing, insurance, investing d). budgeting, insurance, financing, investing

What is the potential of a copper electrode immersed in 0.0380 M in Cu (NO3)2 0.0650 M in NaCl and saturated with CuCl 0.0350 M in NaOH qnd saturated with Cu(OH)2 0.0375 M in Cu (NH3)4^2+ and 0.108 M in NH3 (B4 for Cu (NH3)4^2+ is 5.62 10^11)

1. A standard rotary pump can produce a vacuum pressure of 10 -3 torr. Assuming that only nitrogen is present what is the single-particle collision frequency and mean free path at T = 298 K. How many particles will collide with a surface of an area of 1 cm 2 in one second? 2. A cryogenic pump can produce a vacuum pressure of 10 -10 torr. What is

8. Show the major product (if any), as well as the reagent required to get from A to B, for the following reactions 12 marks each AICI, AICI, NO2 NO2 HNO, H,SO,

A wellestablished food manufacturing and distribution company, specializing in Italian food products, currently has an annual turnover in excess of RM15 million. At present, the company has three production and distribution divisions, each responsible for specific product groups. The summary information of the pasta division relating to divisional

HCI(g) can be made by the direct reaction of H2 and Cl2 in the presence of light. 3.00 g of H2 and 140 g Cl2 are mixed in a 10.00 L flask at 28.0 C. What are the partial pressures of gases after the reaction has completed. Here is the data youll need Temperature and volume remains constant at 28.0 C Wavelength of light needed for the reaction is

From the choices below, select the statements that correctly describe acidic aqueous solutions. O A. pH 7 B. pHD7 C. pH7 OD.(H30 OH O E. H30 OH OF. H30 OH

2. (15 pts) Coalfired power plants and some metallurgical plants that treat sulfide ores or concentrates generate SO2, which if emitted to the atmosphere may cause acid rain. One method for reducing sulfur dioxide emissions is to treat the hot gases with limestone (calcium carbonate). This decomposes thermally to lime upon exposure to hot gases

2. CONSIDER THE PEPTIDE H2N MATINIK COOH a. The peptide is a for the number of amino residues in its structure. b. The N terminal amino acid is c. The Cterminal amino acid is and d. The peptide contains this branched chain amino acids e. The pl of this peptide is

A solution contains 0.001M Cu+ and 0.020M Pb2+. Suppose that solid KI is added until a precipitate just forms. What is [I-] when this first occurs? PbI2 (K = 1.4E-8) CuI (K = 5.3E-12) Now describe what happens if enough KI has been added to reduce [Cu+] to 1E-9M. a. [I-] = 5.3E-9; so as consequence, [Pb2+] = 2.6E-6 and both ions have precipitated

1 Can you infer, just looking at the graphical representations of yn(x) or lyn(x), what is the quantum state (labeled by its quantum number) n 5 What variables and parameters does yn(x) depend on

?

1 Can you infer, just looking at the graphical representations of y(x) or lyn(x), what is the quantum state (labeled by its quantum number) n,Q5 What variables and parameters does yn(x) depend on

3. The following surface tension values were measured for the aqueous solution of a nonionic surfactant CH3(CH2)9(OCHCH2)5OH at 25 C. CSAA (X 104 moldm) y (mNm) 0.1 69.9 0.3 1.0 56.2 47.2 2.0 41.6 5.0 34.0 8.0 30.3 10 29.8 Graphically determine the c.m.c. and also the area per molecule at the c.m.c. of the nonionic surfactant CH3(CH),(OCHCH)5OH at

The bond length of CO is 112.82 pm. What resolution is needed (in wavelength or wavenumber) if you desire to be able to distinguish the l 0 1 rotational line in the rotational spectrum of 12C160 from 13C160 The mass of 12C is 12 amu (this is an exact value). The mass of 13C is 13.00335 amu. The mass of 160 is 15.99491 amu.

Determine the lime dosage and soda dosage for the following water samples:

Detemme the lime dosap and Joda dainge focthe follewny watesample. final TH 100 msha GCO2 msLas ion 100 Ca 27 Mg HCO 200 co2 27 20 20

Calculate the concentration of vacancies in in fcc silver at 250 oC given that the activation energy for vacancy creation in silver is 79.5 kJ/mol. The units for your answer should be vacancies/cm3

1) Write the detailed mechanism for the reaction below (30 points). H30 , heat

6.5 Given that, for 1c02 o 1354.07 cm, w2 672.95 cm, w3 2396.30 cm, X1 3.10 cm, x22 1.59 cm,x33 12.50 cm, X12 5.37 cm,x13 19.27 cm, x23 12.51 cm, 3D 3D g22 0.62 cm calculate the wavenumbers of the v, 1 level and the vz 2 (E, 0) level. The resulting levels both have 2 symmetry and, because of this and the fact that they would

Complete the following:

1) HBr (excess) 2) H,Cro,. H,0 3) HCI ZnCla 4) OH HIO, OH 5) HCI 6) HSO, H,O Hgso, 7) Na. NH3() 8) NABH, OCH, CH,OH 9) 1) LIAIH, OCH, 2) H30 10) mcpba (1.0 equiv.) 11) 1) TSCI, EtgN HO. 2) LIAIH4 12) HBr (exess)

S. Why is it valid to add the enthalpies of any sequence of reactions to obtain the enthalpy of the reaction that is the sum of individual reactions (a) Because H is a path dependent function (b) Because H is a state function (c) Because H is an extensive variable (d) Because the system is connected to the surroundings 6. True or False AH for

What is the molar solubility (in M) of a salt with the formula M2X knowing that its Ksp is 1.20 x 10-5 at the same temperature? 3.5 x 10-3 3.0 x 10-6 6.5 x 10-5 2.3 x 10-2 1.4 x 10-2