Description : Covalent network crystals have-------? A. higher melting point then molecular crystals (Answer) B. lower melting point then molecular crystals C. discrete molecules linked by Van der waals forces D. hydrogen bonding
Last Answer : A. higher melting point then molecular crystals (Answer)
Description : Why do alcohols have boiling points much higher than hydrocarbons of similar molecular weight? (a) Alcohols have greater van der Waals attraction forces. (b) Alcohol molecules have greater ... of volatilization. (d) Alcohols must overcome greater ionic forces in the process of volatilization.
Last Answer : Hydrogen bonds must be broken in the process of volatilization
Description : Which types of chemical bonds are the weakest? a. covalent c. ionic b. Van der Waals d. none of the above
Last Answer : b. Van der Waals
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
Description : The following type of bonding is strongly directional in solids. (A) Vander Waal's (B) Ionic (C) Metallic (D) Covalent
Last Answer : D) Covalent
Description : The atoms in sugar are bound by what type of bond? w) ionic x) hydrogen y) covalent z) van der Waals
Last Answer : ANSWER: Y -- COVALENT
Description : Which action best accounts for the solubility of aldehydes and ketones in water? (a) Polar interactions between solute molecules. (b) H-bonding between solute molecules. (c) Van der waals forces (d) H-bonding between solute and solvent molecules
Last Answer : H-bonding between solute and solvent molecules
Description : When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together? (1) Hydrogen bond formation (2) Vander waals forces (3) Covalent attraction (4) Dipole interaction
Last Answer : (1) Hydrogen bond formation Explanation: When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
Last Answer : Hydrogen bond formation
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
Description : Which of the following is the strongest interaction? (a) a covalent bond (b) dipole-dipole interactions (c) hydrogen bonding (d) van der Waals
Last Answer : a covalent bond
Description : Pick the wrong statement: hydrogen bonding results in (a) Increased solubility in water (b) Higher Van der Waal's forces (c) Molecular association (d) Abnormal boiling point
Last Answer : Ans:(b)
Description : Name type of adsorption in which van der Waals forces are present.
Last Answer : Name type of adsorption in which van der Waals forces are present.
Description : The force responsible for drops of liquid assuming a spherical shape is known as: w) strong nuclear force x) Van der Waals attraction y) surface tension z) osmotic pressure
Last Answer : ANSWER: Y -- SURFACE TENSION
Description : Arrange the following types of interactions in correct order of their increasing strength : Covalent, hydrogen bonding, Vander Waals, dipole dipole
Last Answer : Vander Waals < dipole dipole < hydrogen bonding < covalent.
Description : Is it true both ionic and covalent bonds between molecules are very strong?
Last Answer : Both ionic and covalent bonds are between atoms.
Description : A particular adsorption process has the following characteristics : (i) It arises due to vander Waals forces and (ii) it is reversible. Identify the c
Last Answer : A particular adsorption process has the following characteristics : (i) It arises due to vander Waals ... temperature. D. Energy of activation is low.
Description : Van der Waals equation explains the behaviour of (a) Mixture of gases (b) Ideal gas (c) Real gas (d) Water gas
Last Answer : Ans:(c)
Description : Chemisorption (chemical adsorption) is (A) Same as "Van der Waals" adsorption (B) Characterised by adsorption of heat (C) An irreversible phenomenon (D) A reversible phenomenon
Last Answer : (C) An irreversible phenomenon
Description : Van der Waals derived an expression for the pressure defect', if the observed pressure is denoted as p' and volume is denoted as V', the gas pressure in the bulk of the gas is equal to: A. p + ... a: constant for the particular gas D. p + (a V²); where a: constant for the particular gas
Last Answer : p + a/(V²); where a: constant for the particular gas
Description : Which of the following best explains why the melting points of saturated fats increase with increasing molecular weight? (a) decreased hydrogen bonding (b) increased hydrogen bonding (c) decreased intermolecular van der Waal’s interactions (d) increased intermolecular van der Waal’s interactions
Last Answer : increased intermolecular van der Waal’s interactions
Description : Internal energy of a gas obeying Van-Der-Waals equation of state, [p + (a/v2)] (V - b) = RT, depends upon its (A) Pressure & temperature (B) Pressure & specific volume (C) Temperature & specific volume (D) Temperature only
Last Answer : (A) Pressure & temperature
Description : DNA nucleotides are attached by (a) Hydrogen bonds (b) Covalent bonds (c) VANDER Wall's force (d) Electrovalent bonds
Description : The inter particle forces between linear chains in nylon-66 are __________ bonds. (A) Hydrogen (B) Covalent (C) Ionic (D) None of these
Last Answer : (A) Hydrogen
Description : Arrange the following in the decreasing order of Vander Waal’s radii: Cl, H, O, N.
Last Answer : Ans.The overall decreasing order is: Cl> N > O >H.
Description : Most covalent compounds (a) Behave like electrolytes in the molten state (b) Have high melting and boiling points (c) Are hard substances because of strong covalent bonds (d) Are more soluble in non-polar solvents than in polar solvents
Last Answer : Ans:(d)
Description : A single covalent bond (a) Is formed by the transfer of two electrons (b) Exists between hydrogen and chlorine in an aqueous solution, of hydrochloric acid (c) Is longer than a double bond (d) Does not require energy to disrupt it unlike an ionic bond
Description : Will carbon as an atom interact with other atoms to form ionic or covalent bonds?
Last Answer : Carbon as an atom interacts with other atoms to from covalent bonds.
Description : Pick out the wrong statement. Raoult's law does not apply, when the (A) Size of component molecules are not equal (B) Attractive forces between like and unlike molecules ... D) Chemical combination or molecular association between unlike molecules takes place in the formation of solution
Last Answer : (C) Component molecules are non-polar
Description : A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons. (A) Lack of free (B) Excess of (C) Decrease in (D) None of these
Last Answer : (B) Excess of
Description : Is PCl3 ionic or covalent bonds?
Last Answer : Need answer
Description : How do covalent bonds and ionic bonds compare?
Last Answer : Covalent bonding involves the sharing of electrons. Ionic bonding involves the transfer of electrons.
Description : Why are covalent bonds weaker than ionic bonds?
Last Answer : The short answer is that they are not always weaker in fact. Some ionic compounds have very strong bonds, while some covalent bonds are quite weak. Usually however, it is easier to break an ionic bond than ... and the other has a positive charge they are held together in a bond. I will give an
Description : What are covalent and ionic bonds What are some examples?
Last Answer : ionic - Sodium Chloride Covalent - Water ionic - Sodium Chloride Covalent - Water
Description : What are ionic, covalent and metallic bonds?
Last Answer : all of una deh kraz o! u mean say una no sabi dis kyn simple question.
Description : Bonds formed by the sharing of an electron pair between two atoms are known as - (1) Covalent bonds (2) Ionic bonds (3) Weak bonds (4) None of the above
Last Answer : (1) Covalent bonds Explanation: Bonds which are formed by the sharing of an electron pair between two atoms are known as covalent bonds.
Description : NaCI has _______. (1) Non-polar bonds (2) Polar covalent bonds (3) Metallic bonds (4) Ionic bonds
Last Answer : (4) Ionic bonds Explanation: Sodium Chloride, NaCl. The classic case of ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chlorine atoms and the attraction of the resulting ions.
Description : Mark the compound which possesses ionic, covalent and coordinate bonds. (1) NH4C1 (2) SO3 (3) SO2 (4) H2O
Last Answer : (1) NH4C1 Explanation: Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Description : What is the weak bond holding the nucleic acids together in DNA? a. ionic bonds b. covalent bonds bonds c. polar bond d. hydrogen bond
Last Answer : d. hydrogen bond
Description : Equal sharing of electrons is called _____. a. ionic bonds b. covalent bonds bonds c. double bonds d. triple bonds
Last Answer : b. covalent bonds bonds
Description : The characteristic bonds in nonmetal oxides are which of the following types? w) network x) covalent y) ionic z) coordinate covalent
Last Answer : ANSWER: X -- COVALENT
Description : A bond in which there is an unequal attraction for the shared electrons and a resultant unbalanced distribution of charge is which one of the following types of bonds? w) ionic x) pure covalent y) nonpolar covalent z) polar covalent
Last Answer : ANSWER: Z -- POLAR COVALENT
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
Description : Sodium chloride, potassium chloride, magnesium oxide are examples of molecules with (a) Covalent bonding (b) Ionic bonding (c) Metallic bonding (d) Hydrogen bonding
Description : The bond is a weak bond that can exist between poles of adjacent molecules. a. hydrogen b. ionic c. polar covalent d. non polar covalent
Last Answer : d. non polar covalent