Chemistry Questions and Answers June 26, 2020

Two water samples, 208.4 F of 50 g water and 277.15 K of 0.440925 Ib water, were mixed together then 500g of copper was added to the mixture to achieve a final temperature of 88 C. What is the initial temperature of the copper a) 442.28 F b) 442.28 K c) 78.62 F d) 442.28 C e) 169 C f) 299.05 K g) Answers not here.

What is the heat needed to convert 500 g of ice at 69 C to 464 F a) 1340.6859 ft Ibf b) 410.67 kcal c) Answers not here. d) 1718.226J e) 2040 606J f) 1.72287 BTU

Two samples are placed in contact, and heat flows from the warmer sample to the cooler one. Sample 1, the warmer sample, exhibits a 15.0C decrease in temperature. The initial temperature of Sample 2 was 25.1C. Sample 1 has a specific heat of 0.581 calgC, and Sample 2 has a specific heat of 0.381 calgC. If Sample 1 has a mass of 5.13 g and Sample 2

Which of the following is found in the coenzyme FAD? ? ?

Part B Determine which of the following characteristics may be applied to eukaryotic cell. Check all that apply. lives in specialized groups termed organs has a cell wall as well as a cell membrane its DNA is surrounded by a membrane singlecelled organisms contains choloroplasts Submit Previous Answers Request Answer X Incorrect Try Again 5

Draw the Structure of benzene.

Orioles Candles will be producing a new line of dripless candles in the coming years and has the choice of producing the candles in a large factory with a small number of workers or a small factory with a large number of workers. Each candle will be sold for $10. If the large factory is chosen, the cost per unit to produce each candle will be

(Discretecontinuous mixed up) Suppose that a random variable X has CDF 0 T2 F(x) 23 1112 T 0 0 12 (b) P2 X 4 (c) PX 3 (d) PX 1. (Think carefully about (c) and (d).)

What are steroid medications and what are their uses e 513

You have two waves of the same frequency and polarization but propagating at and angle to each other E, cos(k, rt) and E, cos(k, rt). What is the Poynting vector direction and magnitude Consider first the general case, then specifically the case of equal amplitudes and arbitrary angle between wavevectors k, and k, and finally the case of equal

Since the emf of a cell is always the algebraic sum of two electrode potentials or of two halfcell potentials, it is convenient to calculate each electrode potential separately. For example, for the electrode reaction Zn 2e Zn (3.7) we have RT In (Zn) OZn (3.8) 2F (Zn) where (Zn) represents the activity of zinc ions (molality x activity

Paraffin wax is sometimes incorporated within sheetrock to act as an 1 point insulator. During the day, the wax absorbs heat and melts. During the cool nights, the wax releases heat and solidifies. At sunrise, a small hunk of solid paraffin within a wall has a temperature of 298.15K. The rising sun warms the wax, which has a melting temperature of

4g of NaOH are dissolved in water within an insulated calorimeter. The heat capacity of the resulting solution is 4.18 x 103JC. The temperature of the water prior to the addition of NaOH was 296.15K. If NaOH releases 44.2 kJmol as it dissolves, what is the final temperature of the solution 29.7 K Answers not here. 29.7 F 297.5 F 29.7 C

Classify the following processes as (a) open, (b) closed, (c) neither, or (d) both for a char acteristic operating interval a. Oil storage tank at a refinery. b. Flush tank on a toilet. c. Catalytic converter on an automobile. d. Gas furnace in a home.

1. Calculate the volume that a 0.323 mol sample of gas will occupy at 265 K and a pressure of 0.900 atm. 2. What is the pressure, in atm, of a 0.108 mol sample of helium gas at a temperature of 20 C, if its volume is 0.505 L

1. A gas mixture containing oxygen, nitrogen and helium exerts a total pressure of 925torr. If the partial pressures are oxygen 425 Torr and helium 75 Torr. What is the partial pressure of nitrogen in the mixture? 2. In a mixture of gases the partial pressures are: argon 415 mmHg, neon 75 mmHg and nitrogen 125 mmHg. What is the partial pressure in

Check which gas law is used in this problem and solve it. At a certain temperature and pressure, 16g of oxygen gas in a balloon has a volume of 5 liters. What will the new volume in liters be after 4 grams of O2 is added to the balloon?

At a certain temperature and pressure, 24g of oxygen gas in a balloon has a volume of 6 liters. What will the new volume in liters be after 9 grams of O2 is added to the balloon?

In a mixture of gases the partial pressures are: argon 115 mmHg, neon 375 mmHg and nitrogen 925 mmHg. What is the partial pressure in atm exerted by the gas mixture?

In a mixture of gases the partial pressures are: nitrogen 825 torr, oxygen 85 torr, and helium 875 torr. What is the total pressure exerted by the mixture?

How many grams of gas are in a sample whose molar mass is 70 g / mol and occupies a volume of 6L at 117 kPa and 35.1 C.

In a 5-liter bottle, there is a sample that contains 2.43 moles of nitrogen and 3.07 moles of oxygen, at 298 k- it determines the total pressure of the gases in the bottle.

2. Consider HCI gas. Find its molar entropy using ideal gas and Van der Waals partition functions. Compare these values against experimental results. You may need to look up values for the moment of inertia, fundamental vibrational frequency, and Van der Waals constants.

Indirect readout refers to I. a proteins ability to form hydrogen bonds through a network of water molecules II. ability of a protein to bind both 5 to 3 sequences on the opposite strand of a DNA helix.. III. a proteins ability to recognize a specific DNA sequence by its backbone conformation and flexibility. IV. the proteins ability to make

Carbon dioxide gas can be decomposed into oxygen gas and carbon 2 points monoxide 2CO2(g) 02(g) 2CO(g) AH 486 kJ. How much heat is releasedabsorbed when 9.67g of carbon monoxide combine with oxygen to form carbon dioxide 0.07954 BTU 6.188146 ft Ibf (foot poundforce) O 20.052581 kcal O Answers not here. O 20.052581 kCal

How much heat must be added to convert 4.77 mol of 268.15K ice into 2 points steam O 2.6 J O 2.60x 102 kJ O 2.6x 106 J Answers not here. O 2.6 kJ

What is the heat needed to convert 500 g of ice at 69 C to 464 F 2 points 1340.6859 ft Ibf 1718.226 J 2040 606 J Answers not here. O 410.67 kcal O 1.72287 BTU

What will be the final temperature of a mixture made from 25.0 g of water 1 point at 15.0C, 45.0 g of water at 50.0C, and 15.0 g of water at 37.0C 99.32 K 99.32 C Answers not here. 37.4 F O 99.32 F

What is the volume of water at 23 C with a density of 1.00 gmL must be 1 point mixed with 180 mL (about oz) of coffee at 95 C so that the resulting combination will have a temperature of 60 C Assume that coffee and water have the same density and the same specific heat. 5.677 oz O 170.3 g O Answers not here. 1.039 in3 O 0.1703 cm3

What is the heat needed to be released so that we can convert 500 mg of 2 points steam to ice 1506 kcal O 1.506 J Answers not here. O 1.427413 BTU O 1.1107686 ft Ibf

Imagine that you have a new client asking you to recommend a business structure. Some examples of business structures include sole proprietorship, LLC, partnership, or corporation. Select a business type to use in your response, such as a manufacturer, a dental practice, or a consulting firm. Please do not use a real business name or the names of

1. Calculate the number of elements of unsaturation implied by the molecular formula a. C9H12 b. C4H4Cl2 c. C6H8O2 2. Give the IUPAC names of the following alkenes CH3 CHH, CH)2 a. b. CH3 H3 3. Draw the structure of the following alkenes. a. 3methylpent2ene b. hexa2,4diene c. 2,4dibromocyclopentene d. 3bromo2chloropent2ene e. 3ethyl5methyloct3ene

Does 1,4 dibromo cyclopentene shows cis and trans isomers If yes, show its cis and trans isomers.

Write equations showing Lewis acidbase reaction that takes place when a. Methanol (CH3OH) reacts with BF3 b. Chloromethane (CH3CI) reacts with AICI3

1. How many grams of potassium hydroxy are needed to prepare 600 mL of 0.450 M solution? 2. What is the molarity of a solution prepared by dissolving 7.50 g of Mg(NO3), in enough water to form 25 mL of solution?

1. What volume of 0.250 M solution can be prepared with 16g of K2CO3? 2. Calculate the number of moles of nitric acid in 325 mL of a 16 M solution.

Calculate the molarity of a preparation, diluting 125 mL of 0.400 M K2Cr2O2 with 875 mL of water.

1. What is the molality of a solution that was prepared by dissolving 150 g of C6H12O6 in 600g of water? 2. Prepare a solution by dissolving 100g of C2HO2 in 200g of water. What is its molality?

1. What is the relationship between vapor pressure and boiling point. 2. Explain, why do you get higher temperatures in pressure cookers than in an open cooker?

1. Explain what happens, physically, when a substance boils. 2. Why does the water in a lake freeze starting at the surface and ending at the bottom?

1. How is the property of capillarity manifested? 2. Explain why isopropyl alcohol, warmed to body temperature, still feels cold when applied to the skin?

1. Calculate the % m / m of the following solution: 10g of NaCl in 45 g of water? 2. Calculate the % KCl if 21 g is dissolved in water to 245 mL of solution.

1. Calculate the amount of grams of sugar that must be dissolved in 650g of water to prepare a 25% m / m solution. 2. What is the % of a solution that contains 15g of NaCl in 250g of solution?

How many grams of sucrose must be dissolved in 90g of water to have a solution with a concentration of 20%?

a) Briefly describe the four factors that affect reaction rate. b) When the speed of a reaction is simple and when it is complex. c) When is a reaction homogeneous and when is it heterogeneous?

Predict the molecular shape of these compounds. ammonia, NH3 ammonium, NH, trigonal planar (120) trigonal planar (120) tetrahedral trigonal pyramidal linear tetrahedral bent bent trigonal pyramidal lincar hydrogen sulfide, Hs beryllium fluoride, BeF Be Be linear O trigonal pyramidal linear trigonal pyramidal trigonal planar (120) bent bent

Draw the Lewis structure for SeS 3 and answer the following questions. How many valence electrons are present in this compound? How many bonding electrons are present in this compound? How many lone pair (non-bonding) electrons are present in this compound? What, if anything, is wrong with each of the following structural representations of SeS 3

Draw the Lewis structure of HCN. Include lone pairs.

A solution of 0.1 L of 0.3 M Ca(NO3)2 is mixed with 0.2 L of 0.06 M NaF. Calculate the reaction quotient Qsp. Does calcium fluoride precipitate? (Ksp (CaF2) = 3.2 1011). (A) Qsp = 1.6 104; no precipitate. (B) Qsp = 1.6 104; a precipitate will form. (C) Qsp = 3.2 1011; no precipitate. (D) Qsp = 3.2 1011; a precipitate will form. (E) Qsp = 3.2

In this section, you will introduce the career and/or personal goals related to achieving your BA.GST degree. You will do this in a brief goal statement (one to two paragraphs). You will then develop a SMART goal related to your academic plan of study. Remember that your introduction needs to establish the basis of your decisions for your

Draw the starting structure that would lead to this major product (and its enantiomer) under these conditions. Select to Draw Br2 Br Br

If the specific gravity of gold is 19.0, what is the weight of a cubic inch of gold?

WRITE ANY FIVE KEY WORDS AND DEFINE THEM,( at least in 50 words. For eg. Counterfeiting 1.Illicit Goods 2.Black Market 3. Illegal 4.Human Trafficking 5.Profits

For the following set of reactions predict the major product(s). Underneath each product, state if they are by SN1, SN2, E1, E2. Include stereochemistry where necessary. Also draw out the mechanism for each reaction. OTs a. NaF DCM OH b. CHCOOH H,O TAR . KOtBu H20 Br d. NaEtO ELOH e. Br DMSO

What is the value of the IR transmission factor (f) for a Venuslike planet, if the measured average surface temperature is 706 K Assume the following values for the planet E, 2.60x10 W m2 and a 0.71. Would the average temperature increase or decrease iff decreased

Consider this structure, where X and Y represent generic elements. What shape would this molecule have in three dimensions? tetrahedral? linear? bent? pyramidal? trigonal planar ? What bond angles would this molecule have in three dimensions?? 180?? 120?? 109?

X

Give the IUPAC name of the following :

OH OH a) y CH,CH3 b) CH3 CH3 CHCH CHCH, OH c) d) CH3CH2O CI CI I e) DoCHCHCH3 n 00

Zinc Blende and Wurtzite (ZnS) a. What is the unit cell defined by the sulfide ions in zinc blende b. What close packed structure is defined by the sulfide ions c. How sulfide ions are close to one zinc ion d. What is the unit cell defined by sulfide ions in wurtzite

For each of the following reactions, express the equilibrium constant a) 2502 (g) O2 (g) 2503 b) PCIS (g) c) CaC2 (s) 2H20 (g) 2 C2H2 (g) Ca(OH)2 (s) PCI3 (g) Cl2 (g)

For each of the following reactions, express the equilibrium constant a) C3H3 (g) 502 (g) 2 3CO2 (g) 4H20 b) 4H2 (g) Fe04 (s) 3Fe (s) 4H20 (g)

For each of the following reactions, express the equilibrium constant a) H20 (I) H2 (g) 02 (g) Ke 1.0x107 b) Fe2 (g) 2F (g) Ke 4.9 x 1021 c) C (s) O2 (g) d) H2 (g) C2H4 (g) C2H6 (g) Ke 9.8x1018 e) N204 (g) 2NO2 (g) Ke 4.6x103 CO2 Ke 1.3 x 1069

Say which of the following reactions moves to the right or to the left. a) H20 (I) H2 (g) 02 (g) Ke 1.0x107 b) Fe2 (g) 2F (g) Ke 4.9 x 1021 c) C (s) O2 (g) CO2 Ke 1.3 x 1069 d) H2 (g) C2H4 (g) C2H6 (g) Ke 9.8x1018 e) N204 (g) 2NO2 (g) Ke 4.6x103

The vapor pressure of diethyl ether is 100 Torr at 11. 5 C and 400 Torr at 17.9C. Calculate a) the heat of vaporization b) the normal boiling point and the boiling point in Denver where the barometric pressure is 620 Torr c) the entropy of vaporization at the boiling point d) AG of vaporization at 25C.

Predict how the balance of the following reactions is affected when a) Increase the pressure b) Decrease the pressure c) Increase the temperature 1. CGH6 (g) 3H2 (g) 2 CGH12 (g) 2. C (s) 02 (g) 2 co2 (g) H 206 KJ H 393 KJ

Predict how the balance of the following reactions is affected when a) Increase the pressure b) Decrease the pressure c) Increase the temperature 1. 4AI (s) 302 (g) 2 2A1203 (S) 2. N2 (g) 202 (g) 2 2NO2 (g) H 798 KJ H 16.3 KJ

Indicate which are the conjugated acidbase pairs in the following equations a) HCI NH3 NH, CI b) HCO OH (Co3) H20 c) HC2HO3 H20 2 H0 C2HO2 d) H2SO, H20 H30 HSo, e) CH0 H30 CH3OH H20

Taking into account their properties, indicate which of the following are acids or bases. 1. A compound that turns litmus paper to blue: _________________. 2. A compound that reacts with Zn to produce H2 (g): ____________________. 3. A substance with a bitter taste: ____________________. 4. A compound that reacts with a hydroxide to form water and

Under basic conditions, polyhalogenation generally occurs, in which every a hydrogen is replaced by a halogen atom. What is the most likely product of the followving reaction N IV e II II IV Question 2 Under acidic conditions, only a single halogenation takes place. What is(are) the most likely product(s) of the following reaction IV

1. What is the concentration of [OH] - of a solution of HCl = 1.0 x 10 -4 M. 2. What will be the ion concentration [H +] of a 0.25 M NaOH solution.

Calculate the concentrations of [H +] and [OH] - for solutions that have these values. a. pOH = 9. b. pH = 8.2. c. pOH = 4.8.

Give the correct name for the following alkanes 1. CH3 CH2 CH3 a) propyl b) butane c) propane 2. CH3 CH2 CH2 CH3 a) propane b) butane c) pentane 3. CH3 CH3 a) ethane b) propane c) propyl

Give the correct name for the following alkanes 1. CH3 (CH2)s CH3 a) octane b) hexane c)heptane 2. CH3 (CH2)6 CH3 a) dean b) octane c) nonane

Write the structural formula for the following branched alkanes: a) 2,3-dimethylbutane b) 2,2,3,3-tetramethylpentane.

Write the structural formula for the following branched alkanes: a) 3,4-dimethyl-4-ethylheptane. b) 2,5-dimethylhexane.

Write the IUPAC name for each of the following alkenes: 1. CH 3 -CH = CH 2 2. CH 3 -CH 2 -CH = CH 2 3. CH 3 -CH = CH-CH 3

Write the IUPAC name for each of the following alkenes: 1. CH 2 =C=CH 2 2.CH 3 -CH=CH-CH=CH 2 3. CH 3 -CH 2 -CH=CH 2

Write the IUPAC name for each of the following alkenes: 1. CH 2 =CH 2 -CH 3 2.CH 3 -CH=CH-CH=CH-CH 3 3. CH 2 =CH-CH 2 -CH 2 -CH=CH 2 4. CH 3 -CH 2 -CH 3

Write the semi-developed formula for the following alkenes: a) 2-heptene. b) 1,2,5-heptatriene. c) 1,3-Propanediol

Write the semi-developed formula for the following alkenes: a) 1,4,7-decatriene. b) 1,2-dibromoethene.

Give the correct name for the following aromatic compounds CH2 CH3 CH2 CH3 CH2 CH3 3. 1. 2. CH2 CH3 CH3 4. CH3 CH2CH2. CH3 CH3 CH2 CH3

Give the correct name for the following aromatic compounds CHCH2 CH3 2) CH3 3) 1) CH3 CH CH CH3 CH3 CH3 4) CHCH2 5) 6) CH3

Make the structural or name formula to the following alcohols a) 2propanol. b) CH3CH2CHOHCH3. c) 1,2,3propanetriol. d) CH3CHCH H. e) CH2CHCH2CH20H.

Recognize each compound say if it is amine or amide and give it a name. 1. C NH2 2. CH3C NH2

Recognize each compound say if it is amine or amide and give it a name. 1. CH3NHCH2CH3. 2. NH2 3. C NHCH3

Name the following ketones a) CH3CH2COCH2CH3. II b) CHH2CHCH. ) CH32CH.

Build the structural formula of the following ketones: a) Til, methyl ketone b) Cycloexanone c) Methyl, propyl ketone

The selectivity coefficient, KgHt, for a K ionselective electrode is 0.00843. When the electrode is placed into a 3.84 x 105 M K solution at pH 6.76, the potential is 0.157 V vs. SCE. If the pH of the solution is lowered to 1.24 and the ionic strength is kept constant, what is the potential of the electrode Assume 1 for the electrode. E V vs. SCE

Predict the aggregation and describe using diagrams the hydrogen bonding arrangements expected in cocrystals of 1 with the following molecules HO OH 1 (1) water, (ii) methanol, (ii) bromoacetic acid and (iv) dimethylsulfoxide.

1. The hybridization in which 3p orbitals are combined with one s orbital is called a) sp b) sp c) sp3 d) sp 2. The sp3 hybridization is formed by the combination of a) one 2s orbital and 3 2p orbitals b) One 2s orbital and 2 2p orbitals c) A 2s orbital and a 2p orbital. d) Two 2s orbitals and 2 2p orbitals.

1. The pi bond is formed with orbitals a) hybrids b) sp2 c) nonhybrids d) 2s2 2. The double bond between carbon atoms exists a) 3 pi bonds and one sigma bond. b) 2 pi bonds and 2 sigma bonds. c) a pi bond and a sigma bond. d) 2 pi bonds and one sigma bond. 3. The sigma bond is formed with orbitals a) hybrids. b) sp. c) nonhybrids. d) 2s.

Complete the chart on hybridization theory Hybridization No. Orb. Hib. No. Orb. no Hib. Type of bond Sp Sp3 simple Sp

Below is a photochemically allowed, intramolecular cycloaddition which results in a tricyclic compound. Show why light is necessary for the reaction to occur using an MO diagram of the pi system. In addition, show the mechanism and product for the reaction. light tricyclic sytem

If 2.0 mL of 250% (yuyg) eQ solution is diluted to 450.0 mL, what is the new concentration in molarity? NaC]

Predict major product(s) in each of the following Friedel-Crafts reactions. If the reaction does not occur, offer a reasonable explanation for that fact. Predict major product(s) in each of the following Friedel-Crafts reactions. If the reaction does not occur, offer a reasonable explanation for that fact.

II CH2CH2CH2CCI AICI3 () GHNO2 CH CIO AICI3 (b) (CH)HCI CS2 CH(CH3)2 AIC13 () H3CCCI CS2

The following figure shows the intermediate of the transketolase mechanism. Use arrow pushing to form the resonance stabilized enzyme intermediate. Show the mechanism for reaction of this intermediate with the given aldose, using the protonated acidbase residue suppliec by the enzyme. Clearly show the product of the reaction and make sure that the

The concentration of Al3 ion in a sample of spring water is 24.7 ppm. What mass of Al3 ion is present in 2,276 mL of this spring water, which has a density of 1.00 gmL A) 0.328 g B) 0.247 g C) 2276 g D) 0.0562 g The concentration of Cu2 ion in a sample of spring water is 5.3 ppm. What mass of Cu2 ion is present in 5,475 mL of this water sample,

Benzene (CaHo) boils at 80.1C and its molar enthalpy of vaporization is AHvap31L.0 kJmol. a. What is the sign of ASv when benzene boils Explain. 3D b. Calculate the value of ASsys when 37.0 g CoHo boils.

Nucleotide triphosphates and nucleotide diphosphates often form stable complexes with Na Fe3 Mg2 KT

Provide an IUPAC name for each of the following alcohols: Indicate the stereochemistry where needed.

OH CI OH a) j) mistrySt Chemist S b) Br Chetrys g) Cstry e k) Br OH OH c) CH OH OH 1) h) OH d) Ch y CI OH OH OH e) i) m)

For each of the following reactions, predict the major product(s), showing proper stereochemistry where appropriate. Write N.R. if no reaction occurs. Identify the type of substrate (1, 2, 3) and give the type of mechanism by which each product is formed (Sy1, S2, E, E). alc. KOH 100 H. CI H Br alc. KOH 100 CHCH2 H3C CH3 Br CH CH2OH (CH)CHCH2 heat