Based on the intermolecular forces involved, which of the following molecules will have the lowest boiling point? w) ethane x) methyl alcohol y) methyl amine z) methyl fluoride

Based on the intermolecular forces involved, which of the following molecules will have the lowest boiling point? w) ethane x) methyl alcohol y) methyl amine z) methyl fluoride
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ANSWER: W -- ethane
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Use the information and data given below to answer the questions • Stronger intermolecular forces result in higher boiling point • Strength of London forces increases with the number of electrons in the molecule • Boiling point of HF ,HCl, HBr and HI are 293K,189K,206K and 238K respectively (a) Which type of intermolecular forces are present in the molecules HCl, HBr and HI? (b) Looking at the trend of boiling points of HCl, HBr and HI, explain, out of dipole interaction and London interaction, which one predominant here? (c) Why is the boiling point of HF highest while that of HCl lowest?

Description : Use the information and data given below to answer the questions Stronger intermolecular forces result in higher boiling point Strength of London forces increases with the number of electrons in the molecule ... here? (c) Why is the boiling point of HF highest while that of HCl lowest?

Last Answer : Ans :( a) In the molecules HCl, HBr and HI, dipole-dipole interaction and London forces are present. (b) Dipole moment of HCl > HBr > HI but boiling point of HCl < HBr

The boiling points of the halogens increase going from F2 to I2. What type of intermolecular forces are responsible for this trend? w) permanent dipole x) hydrogen bonding y) ion-ion attraction z) London dispersion forces

Description : The boiling points of the halogens increase going from F2 to I2. What type of intermolecular forces are responsible for this trend? w) permanent dipole x) hydrogen bonding y) ion-ion attraction z) London dispersion forces

Last Answer : ANSWER: Z -- LONDON DISPERSION FORCES

Which of the following would be most acidic? w) phenol x) methanol y) acetic acid z) methyl amine

Description : Which of the following would be most acidic? w) phenol x) methanol y) acetic acid z) methyl amine

Last Answer : ANSWER: C -- ACETIC ACID

This noncombustible liquid in its dry form is noncorrosive to common metals except aluminum. About 90% of all of this material which is manufactured goes into the production of chlorofluorocarbons. Is this substance: w) carbon tetrachloride x) methylene chloride y) hydrogen chloride z) methyl fluoride

Description : This noncombustible liquid in its dry form is noncorrosive to common metals except aluminum. About 90% of all of this material which is manufactured goes into the production of chlorofluorocarbons. ... substance: w) carbon tetrachloride x) methylene chloride y) hydrogen chloride z) methyl fluoride

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Description : Which is the HEAVIEST of the following molecules: w) butane x) ethane y) methane z) propane

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Description : A sample of pure amine molecules is found to possess no intermolecular Hbonding. This sample is most likely : (a) 1° amine (b) 2° amine (c) 3° amine (d) all of these

Last Answer : 3° amine

Which of the following aqueous solutions would hav the lowest boiling point? Would it be a 1.0 molal solution of: w) Hydrochloric acid x) Sodium Hydroxide y) Acetic Acid, z) Magnesium Chloride

Description : Which of the following aqueous solutions would hav the lowest boiling point? Would it be a 1.0 molal solution of: w) Hydrochloric acid x) Sodium Hydroxide y) Acetic Acid, z) Magnesium Chloride

Last Answer : ANSWER: Y -- ACETIC ACID

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Description : Assuming roughly equivalent molecular weights, which of the following would have the highest boiling point? (a) a tertiary amine (b) a quaternary ammonium salt (c) an alcohol (d) an ether

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Consider a small aliphatic 1° amine, 1° alcohol, ester, carboxylic acid, and amide, all of similar molecular weight. Which one is most likely to have thehighest boiling point?(a) The amide(b) The alcohol(c) The ester(d) The carboxylic acid

Description : Consider a small aliphatic 1° amine, 1° alcohol, ester, carboxylic acid, and amide, all of similar molecular weight. Which one is most likely to have the highest boiling point? (a) The amide (b) The alcohol (c) The ester (d) The carboxylic acid

Last Answer : The amide

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Last Answer : Hydrogen bonds must be broken in the process of volatilization

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Description : Which of the following compounds has the lowest boiling points? w) CH4 x) CCl4 y) PH3 z) PCl3

Last Answer : ANSWER: W -- CH4

Define intermolecular forces. Also write down effect of intermolecular forces on melting points & boiling points of substances?

Description : Define intermolecular forces. Also write down effect of intermolecular forces on melting points & boiling points of substances?

Last Answer : The forces of attraction present between the molecules of a compound are called Intermolecular forces''. Effect of intermolecular forces on the m.p and b.p of substances If intermolecular forces of attractions in ... . And if these forces are weak then the m.p and b.p will be relatively lower.

The noble gases have low boiling points because: w) their ionization potentials are very low x) only weak Van der Waals forces hold the atoms together y) they are produced by the fractional distillation of liquid air z) they have eight electrons in the outer shell

Description : The noble gases have low boiling points because: w) their ionization potentials are very low x) only weak Van der Waals forces hold the atoms together y) they are produced by the fractional distillation of liquid air z) they have eight electrons in the outer shell

Last Answer : ANSWER: X -- ONLY WEAK VAN DER WAALS FORCES HOLD THE ATOMS TOGETHER

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Description : Carbylamine test involves heating a mixture of (a) alcoholic KOH, methyl iodide, and sodium metal (b) alcoholic KOH, methyl iodide, and primary amine (c) alcoholic KOH, chloroform, and primary amine (d) alcoholic KOH, methyl alcohol, and primary amine

Last Answer : alcoholic KOH, chloroform, and primary amine

Safety aside, for which of the following reasons is alcohol used in preference to mercury in a minimum thermometer? w) Alcohol has a higher boiling point x) Alcohol has a lower freezing point y) Alcohol contracts more uniformly z) Alcohol can be dyed for visibility

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Last Answer : ANSWER: X -- ALCOHOL HAS A LOWER FREEZING POINT

Predict what will happen if intermolecular forces between the molecules are very weak

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Which type of intermolecular forces exists among the following molecules? (a) H2S molecules (b) H2O (c) Cl2 and CCl4 (d) SiH4 (e) Helium (f) He atoms and HCl molecules

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Name two intermolecular forces that exist between HF molecules in liquid state.

Description : Name two intermolecular forces that exist between HF molecules in liquid state.

Last Answer : Ans. Dipole-dipole interaction and hydrogen bonding.

Surface tension of liquids is the result of which the following: w) interaction of a liquid with its container x) unbalanced forces on the liquid's surface molecules y) adhesive forces of the liquid z) interaction of the liquid's surface molecules and the applied pressure

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What are the Intermolecular forces of 1-(2-propoxy2-methyl)-butane?

Description : What are the Intermolecular forces of 1-(2-propoxy2-methyl)-butane?

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Last Answer : ANSWER: Z -- METHANOL

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Which of the following chemical compounds is an important aromatic hydrocarbon. Is it: w) methane x) ethane y) benzene z) propyne

Description : Which of the following chemical compounds is an important aromatic hydrocarbon. Is it: w) methane x) ethane y) benzene z) propyne

Last Answer : ANSWER: Y -- BENZENE

An amine contains which one of the following functional groups? w) NO2 x) NOH y) NH2 z) N2

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Description : Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its (A) Tensile strength (B) Chemical resistance (C) Flexibility (D) All (A), (B) & (C)

Last Answer : (C) Flexibility

Which of the following forms the weakest acid in aqueous solution? w) hydrogen fluoride x) hydrogen chloride y) hydrogen bromide z) hydrogen iodide

Description : Which of the following forms the weakest acid in aqueous solution? w) hydrogen fluoride x) hydrogen chloride y) hydrogen bromide z) hydrogen iodide

Last Answer : ANSWER: W -- HYDROGEN FLUORIDE

Which of the following compounds contains both io and covalent bonds? w) Calcium Chloride x) Carbon Dioxide y) Calcium Fluoride z) Calcium Sulfate

Description : Which of the following compounds contains both io and covalent bonds? w) Calcium Chloride x) Carbon Dioxide y) Calcium Fluoride z) Calcium Sulfate

Last Answer : ANSWER: Z -- CALCIUM SULFATE

Under similar conditions, which of the following i is the best reducing agent under similar conditions? w) fluoride ion x) chloride ion y) bromide ion z) iodide ion

Description : Under similar conditions, which of the following i is the best reducing agent under similar conditions? w) fluoride ion x) chloride ion y) bromide ion z) iodide ion

Last Answer : ANSWER: Z -- IODIDE ION 

Which of the following would you expect to have the highest boiling point? w) methane x) carbon tetrachloride y) chloroform z) chloromethane

Description : Which of the following would you expect to have the highest boiling point? w) methane x) carbon tetrachloride y) chloroform z) chloromethane

Last Answer : ANSWER: X -- CARBON TETRACHLORIDE

Which of the following properties is lower for a solution than for the pure solvent? w) osmotic pressure x) vapor pressure y) temperature z) boiling point

Description : Which of the following properties is lower for a solution than for the pure solvent? w) osmotic pressure x) vapor pressure y) temperature z) boiling point

Last Answer : ANSWER: X -- VAPOR PRESSURE

Which of the following properties is greater for a solution than for the pure solvent? w) freezing point x) vapor pressure y) temperature z) boiling point

Description : Which of the following properties is greater for a solution than for the pure solvent? w) freezing point x) vapor pressure y) temperature z) boiling point

Last Answer : ANSWER: D -- BOILING POINT

Compared to Chlorine, Bromine has: w) smaller atomic size x) higher density y) lower boiling point z) greater number of outer electrons

Description : Compared to Chlorine, Bromine has: w) smaller atomic size x) higher density y) lower boiling point z) greater number of outer electrons

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Which of the following compounds has the highest boiling point? w) CH4 x) CCL4 y) HI z) IF5

Description : Which of the following compounds has the highest boiling point? w) CH4 x) CCL4 y) HI z) IF5

Last Answer : ANSWER: Z -- IF5

How do the boiling points of butane, propane, and ethane compare? (a) the boiling point of ethane is greatestb) the boiling point of butane is greatest. (c) the boiling point of propane is greatest. (d) there is no relationship among these three alkanes and their boiling points.

Description : How do the boiling points of butane, propane, and ethane compare? (a) the boiling point of ethane is greatest. b) the boiling point of butane is greatest. (c) the boiling point of propane is greatest. (d) there is no relationship among these three alkanes and their boiling points

Last Answer : the boiling point of butane is greatest.

Ethanol amine is produced using ammonia and (A) Ethyl benzene (B) Ethylene oxide (C) Ethanol (D) Ethane

Description : Ethanol amine is produced using ammonia and (A) Ethyl benzene (B) Ethylene oxide (C) Ethanol (D) Ethane

Last Answer : (B) Ethylene oxide

Which of the following odors does the ester, methyl salicylate, produce? Is the odor that of: w) cinnamon x) avocado y) orange z) oil of wintergreen

Description : Which of the following odors does the ester, methyl salicylate, produce? Is the odor that of: w) cinnamon x) avocado y) orange z) oil of wintergreen

Last Answer : ANSWER: D -- OIL OF WINTERGREEN

Pkb of aniline is more than that of methyl amine.

Description : Pkb of aniline is more than that of methyl amine.

Last Answer : In aniline, the lone pair of electrons on the N-atom are delocalized over the benzene ring. As a result electron density on the nitrogen decreases. In contrast in CH2NH2 , + I effect of CH3 ... , aniline is a weaker base than methylamine and hence its Pkb value is higher than that of methylamine.

AS A GROUP, the halogens have the largest: w) atomic radii x) Boiling points y) electronegativities z) ionization energies

Description : AS A GROUP, the halogens have the largest: w) atomic radii x) Boiling points y) electronegativities z) ionization energies

Last Answer : ANSWER: Y -- ELECTRONEGATIVITIES

As a pendulum swings from its highest to its lowest point, it has the SMALLEST acceleration when it is: w) at its lowest point x) at its highest point y) at a point 1/3 the distance from the top of its swing z) at a point 1/2 the distance from the top of its swing.

Description : As a pendulum swings from its highest to its lowest point, it has the SMALLEST acceleration when it is: w) at its lowest point x) at its highest point y) at a point 1/3 the distance from the top of its swing z) at a point 1/2 the distance from the top of its swing. 

Last Answer : ANSWER: W -- AT ITS LOWEST POINT

Within a given period of the periodic table, the element with the lowest ionization energy is: w) transition metal x) alkali metal y) halogen z) noble gas

Description : Within a given period of the periodic table, the element with the lowest ionization energy is: w) transition metal x) alkali metal y) halogen z) noble gas

Last Answer : ANSWER: X -- ALKALI METAL

Explain the effect of increasing the temperature of a liquid, on intermolecular forces operating between its particles. What will happen to the viscosity of a liquid if its temperature is increased? Arrange the following in increasing order of viscosity-water, hexane, glycerine.

Description : Explain the effect of increasing the temperature of a liquid, on intermolecular forces operating between its particles. What will happen to the viscosity of a liquid if its temperature is increased? Arrange the following in increasing order of viscosity-water, hexane, glycerine.

Last Answer : Ans. On increasing the temperature , the kinetic energy of liquid molecules increases so that it can overcome the attractive forces between the molecules and hence liquid can flow more easily i.e. viscosity decreases. Order of increasing viscosity : hexane < water < glycerine.

Elaborate the statement that physical state of existence at given conditions is a balance between the thermal energy and intermolecular forces.

Description : Elaborate the statement that physical state of existence at given conditions is a balance between the thermal energy and intermolecular forces.

Last Answer : Ans. Intermolecular forces tend to keep the molecules together but thermal energy of the molecules tends to keep them apart. The three states of matter are the result of the balance between intermolecular forces and thermal energy of the molecules.

Which type of intermolecular forces are effected in each of the following process: (i)Sublimation of iodine. (ii)Evaporation of water.

Description : Which type of intermolecular forces are effected in each of the following process: (i)Sublimation of iodine. (ii)Evaporation of water.

Last Answer : Ans. (i) Sublimation of iodine : Dispersion forces. (ii)Evaporation of water : Hydrogen bond.

Define (a) Dipole-Dipole Forces (b) Avogadro law (c) Intermolecular forces

Description : Define (a) Dipole-Dipole Forces (b) Avogadro law (c) Intermolecular forces

Last Answer : Ans.(a) Dipole-dipole forces : The force of attraction which act between two molecules having permanent dipoles. (b) Avogadro Law : Equal volumes of all gases under the similar condition of ... . V α n (c) Intermolecular Forces: The forces of attractions and repulsion between interacting particles.

Which class of solids could have London Forces the attractive forces between particles in crystal lattice positions? w) ionic x) covalent y) metallic z) molecular

Description : Which class of solids could have London Forces the attractive forces between particles in crystal lattice positions? w) ionic x) covalent y) metallic z) molecular

Last Answer : ANSWER: Z -- MOLECULAR

Forces in ionic crystalline solids are primarily which of the following? w)covalent x)electrostatic y)Van der Waals z)magnetic

Description : Forces in ionic crystalline solids are primarily which of the following? w)covalent x)electrostatic y)Van der Waals z)magnetic

Last Answer : ANSWER: X -- ELECTROSTATIC

Which one of the following is largest? w) the number of molecules in 2 grams of hydrogen gas x) the number of molecules in 60 grams of lead sulfate y) the number of molecules in 20 liters of oxygen gas at standard temperature and pressure z) the population of the United States

Description : Which one of the following is largest? w) the number of molecules in 2 grams of hydrogen gas x) the number of molecules in 60 grams of lead sulfate y) the number of molecules in 20 liters of oxygen gas at standard temperature and pressure z) the population of the United States

Last Answer : ANSWER: A - THE NUMBER OF MOLECULES IN 2 GRAMS OF HYDROGEN GAS  

Nutrasweet, the artificial sweetener, contains molecules in which of the following groups? w) carbohydrates x) lipids y) amino acids z) nucleic acids

Description : Nutrasweet, the artificial sweetener, contains molecules in which of the following groups? w) carbohydrates x) lipids y) amino acids z) nucleic acids

Last Answer : ANSWER: C--AMINO ACIDS