C9HW1

Liquids with large intermolecular forces tend to have high surface tension. True False

Which of the following properties is a measure of the energy needed to increase the surface area of a liquid? a.capillary action b.surface tension c.viscosity d.cohesion e.specific elasticity

At atmospheric pressure, iodine moves directly from solid to gas in a process called __________.

The unit cell in a certain lattice consists of a cube formed by an anion at each corner, an anion in the center, and a cation at the center of each face. The unit cell contains a net: A.3 anions and 4 cations B.5 anions and 3 cations C.2 anions and 3 cations D.2 anions and 2 cations E.5 anions and 6 cations

Which of the following best describes the bonding between atoms in metals. a.the transfer of electrons from one atom to another, producing charges which then interact with each other according to Coulomb's Law b.by sharing electrons in pairs with metal adjacent atoms c.by fusion of the atomic nuclei to produce a continuous, malleable array d.the valence electrons of each metal atom are delocalized (spread) over all of the atoms in the piece of metal e.the fusion of the protons, neutrons and electrons to form a hard solid mass

Which of the compounds below is an example of a network solid? A.SiO2(s) B.C25H52(s) C.NaCl(s) D.S8(s) E.MgO(s)

In network solids, the lattice sites are occupied by __________ (two words).

What is the distance, in atomic radii, across a diagonal face of a face-centered unit cell? A. 4r/√3 B. 2´ r C. 4´r D. 2√2*r E. r

Which of these correctly describes the lattice arrangement shown below? *Image of 3 colors, abca* aba layer arrangement (packing) body-centered cubic unit cell cubic closest packing abac layer arrangement (packing)

Aluminum is ________, a property of metals by which they can be pounded into thin sheets (aluminum foil)

For which of the following elements (in their normal, stable, forms) would it be correct to describe the bonding as involving a "sea of electrons"? a. hydrogen b. helium c. sulfur d. iodine e. lithium

The angle between adjacent carbob-carbon bonds in diamond is A. 60° B. 90° C. 109.5° D. 120° E. 180°

Hydrogen bonding is a type of London dispersion force. True False

Which of the following is least true for ideal gases? a. strong intermolecular forces of attraction b. easily compressed c. individual particles in constant random motion d. fill the entire volume of a container e. low viscosity

Which of the compounds below is not an example of a molecular solid? A. C25H52(s) B. SiO2(s) C. I2(s) D. CO2(s) E. H2O(s)

What is the simplest formula of a solid containing A, B, and C atoms in a cubic lattice in which the A atoms occupy the corners, the B atoms the body-center position, and the C atoms the faces of the unit cell? A. ABC3 B. A8BC6 C. ABC D. A4BC3 E. ABC6

Which of the compounds below is an example of a network solid? A. MgO(s) B. SiO2(s) C. NaCl(s) D. S8(s) E. C25H52(s)

Which of the following is NOT a network solid? elemental silicon, Si(s) diamond, C(s) graphite silicon dioxide, SiO2(s) aluminum oxide, Al2O3(s)

Which of the following is NOT a network solid? A. elemental silicon, Si(s) B. diamond, C(s) C. graphite D. silicon dioxide, SiO2(s) E. dodecane, C12H26(s)

Which of these correctly describes the lattice arrangement shown below? Assume all atoms are the same element. *Image of 3 colors, abab* A. cubic unit cell B. hexagonal closest packing (hcp) C. abca layer arrangement (packing) D. simple cubic (primitive) unit cell

Molecular solids do not conduct electric current. True False

Which statement or statements concerning metals is INCORRECT? i) in the solid state, metals conduct electric current uniformly in all directions ii) the bonding in most metallic solids is mono-directional iii) the "electron sea model" explains electrical conductivity of metals by assuming that their valence electrons move freely within the lattice A. i) only B. ii) only C. iii) only D. i) and ii) only E. i) and iii) only F. none are incorrect

The hybridization of carbon in graphite is _________. Enter your answer with no superscripts or subscripts, i.e., ab3.

Order the intermolecular forces (dipole-dipole, London dispersion, and hydrogen-bonding) from weakest to strongest . A. dipole-dipole, London dispersion, hydrogen-bonding B. dipole-dipole, hydrogen-bonding, London dispersion C. London dispersion, hydrogen-bonding, dipole-dipole D. hydrogen-bonding, dipole-dipole, London dispersion E. London dispersion, dipole-dipole, hydrogen-bonding

Ice is a molecular solid. True False

In any cubic lattice an atom lying at the corner of a unit cell is shared equally by how many unit cells? A. 2 B. 8 C. 6 D. 1 E. 4

If a metal crystallizes in a face-centered cubic lattice, each metal atom has ____ "nearest neighbors." 3 4 6 8 12

Choose the answer which best describes what type of solid the elements and compounds below form, in that order. Kr CH3OH BaBr2 diamond a. ionic, network, molecular, metallic b. network, molecular, ionic, metallic c. atomic, molecular, ionic, molecular d. network, molecular, ionic, metallic e. atomic, molecular, ionic, network

Which equation represents the number of atoms in a primitive cubic unit cell? A. 1/8*8 B. 1/4*8 C. 1+ 1/8*8 D. 1/2*6 + 1/8*8 E. 1+ 1/2*6 + 1/8*8

Ice is an example of a molecular solid that conducts an electric current because of it strong hydrogen bonding. True False

In the band model of metallic bonding, metal valence atomic orbitals overlap in three dimensions forming bands, molecular orbitals that spread throughout the solid True False

Graphene was first prepared by removing layers from _________.

In hydrogen iodide __________________ are the most important intermolecular forces. a. dipole-dipole forces b. London dispersion forces c. hydrogen bonding d. covalent bonds e. polar covalent bonds

Which of the following terms refers to the resistance of a liquid to flow? a. surface tension b. capillary action c. viscosity d. adhesion e. cohesion

Which of the following has the highest melting temperature? A. CO2 B. MgF2 C. S8 D. H2O E. P4

The net number of spheres in the face-centered cubic unit cell is 4. True False

Which of the compounds below is an example of a network solid? A. SiO2(s) B. C25H52(s) C. MgO(s) D. NaCl(s) E. S8(s)

Which of the following is not an example of a network covalent solid? a. iron b. diamond c. graphite d. SiC (silicon carbide) e. SiO2 (sand)

Silicates are network solids which contain Si-O-Si bridges that make up many rocks, clays and ceramics. True False

An atom located on a face of a unit cell is shared equally between ____ unit cells. 2 3 4 6 8

The total number of nearest neighbor atoms surrounding a given atom in a closest packed lattice is A. 2 B. 4 C. 6 D. 8 E. 12 F. 16

The two most common forms of pure carbon are graphite and __________.

The strongest intermolecular interactions between ethyl alcohol (CH 3CH 2OH) molecules arise from a. dipole-dipole forces. b. London dispersion forces. c. hydrogen bonding. d. ion-dipole interactions. e. carbon-oxygen bonds.

Which of the following liquids has the greatest viscocity? a. hexane (C6H14) b. CH3OCH2CH3 c. CH3CH2OCH2CH3 d. CH3CH2OH e. HOCH2CH2OH

Most atomic solids have low melting points. True False

In the unit cell of sphalerite, Zn 2+ ions occupy half the tetrahedral holes in a face-centered cubic lattice of S 2- ions. The number of formula units of ZnS in the unit cell is: A. 1 B. 3 C. 6 D. 2 E. 4

Which of the following statements concerning a metal crystallized in a face-centered cubic cell is/are CORRECT? 1. One metal atom is located on each face of the unit cell, where it is shared equally between four unit cells. 2. One metal atom is located at the center of the unit cell. 3. A metal atom is located at each of the eight lattice points, where it is shared equally between eight unit cells. 1 only 2 only 3 only 1 and 3 1, 2 and 3

Which of the compounds below is an example of a network solid? A. C25H52(s) B. NaCl(s) C. SiO2(s) D. MgO(s) E. S8(s)

Silicon carbide (SiC) is very hard substance with a high melting point. Which of these describes the type of solid it forms? A. network B. metallic C. ionic D. molecular E. None of these

hich one of the following statements about solid Cu (face-centered cubic unit cell) is incorrect? A. The number of atoms surrounding each Cu atom is 12. B. The solid has a cubic closest-packed structure. C. There are two atoms per unit cell. D. It will conduct electricity. E. The arrangement of layers in the Cu lattice is abca.

An alloy is a substance that consists of a mixture of elements and has metallic properties. True False

Which one of the following properties is least characteristic of typical metals? a. moderately high melting point b. high boiling point c. brittleness d. good electrical conductor when solid e. good electrical conductor when molten

The strongest intermolecular interactions between ethyl alcohol (CH 3CH 2OH) molecules arise from a. dipole-dipole forces. b. London dispersion forces. c. hydrogen bonding. d. ion-dipole interactions. e. carbon-oxygen bonds.

In any cubic lattice an atom lying at the corner of a unit cell is shared equally by how many unit cells? A. 6 B. 1 C. 4 D. 2 E. 8

If a metal crystallizes in a body-centered cubic lattice, each metal atom has ____ "nearest neighbors." 3 4 6 8 12

Choose the answer which best describes what type of solid the elements and compounds below form, in that order. Kr CH3OH BaBr2 diamond a. ionic, network, molecular, metallic b. network, molecular, ionic, metallic c. atomic, molecular, ionic, molecular d. network, molecular, ionic, metallic e. atomic, molecular, ionic, network