| A | B |
|---|
| as the strength of the attractive intermolecular forces INCREASES? | vapor pressure of a liquid |
| ) Order the intermolecular forces (dipole-dipole, London Dispersion, ionic, and hydrogen-bonding) from WEAKEST to STRONGEST | (b) London Dispersion , dipole-dipole, hydrogen-boiling, and ionic |
| Hydrogen Bonds account for | water's high boiling point for its molar mass |
| ) Which of the following would you expect to have the HIGHEST BOILING POINT? (a) F₂ (b) Cl₂ (c) Br₂ (d) I₂ (e) All of the other choices have same Boiling Point | I₂ |
| ) Which of the following is MOST likely to be a solid at room temperature? (a) Na₂S (b) HF (c) NH₃ (d) N₂ (e) H₂O | Na₂S |
| Which of the following should have the LOWEST BOILING POINT? (a) Na₂S (b) HF (c) NH₃ (d) N₂ (e) H₂O | N₂ |
| On a RELATIVE BASIS, the WEAKER the intermolecular forces in a substance, | (c) the GREATER its Vapor Pressure at a particular temperature |
| Which of the following species would you expect to show the LEAST HYDROGEN-BONDING? (a) NH₃ (b) H₂O (c) HF (d) CH₄ (e) all the other choices will each have the SAME H-B | CH₄ |
| The molecules in a sample of solid SO₂ are attracted to each other by a combination of | London Forces and dipole-dipole interactions |
| What is the correct order of boiling points for KNO₃ , CH₃OH , C₂H₆, Ne? | Ne < C₂H₆ < CH₃OH < KNO₃ |
| This statement about LIQUIDS is TRUE? | (c) London dispersion forces arise from a distortion of the electron clouds within a molecule or atom |
| statement is true about water? | (a) Energy must be given off in order to break down the crystal lattice of ice to a liquid AND Hydrogen bonds are stronger than covalent bonds AND Liquid water is less dense than solid water AND Only covalent bonds are broken down when ice melts |
| In which of the following groups of substances would dispersion forces be the only significant factors in determining boiling points? Cl₂ HF Ne KNO₃ CCl₄ | Cl₂ and Ne and CCl₄ |
| The elements of group 5A, the nitrogen family, form compounds with hydrogen having the boiling points listed: SbH₃ -17⁰C AsH₃ -55⁰C PH₃ -87⁰C NH₃ -33⁰C The first three elements illustrate a trend where the boiling point decreases as the mass decreases;however, ammonia ( NH₃ ) does NOT follow the trend because of | hydrogen bonding |
| involves no bonding forces except London dispersion forces? | N₂ (s ) |
| substances in order of highest to lowest melting temperature: | SiO₂ NaCl Na Cl₂ |
| Which of the following substances would you expect to have the LOWEST BOILING POINT? diamond or methane ( CH₄ ) or sodium nitrate ( NaNO₃ ) or glycerine C₃H₅(OH)₃ or copper | methane |
| TRUE or FALSE? In general, the density of a compound as a gas is closer in value to that of the compound as a liquid, than the density of the compound as a liquid is closer to the value of that compound as a solid. | false |
| TRUE or FALSE? Second row hydrides generally have higher than expected boiling points for their position on the periodic table. | true |
| The molar volume of a certain form of solid lead is 18 cm³/mol. Assuming cubic closet packed structure, determine the following: The number of Pb atoms per unit cell. | four |
| The molar volume of a certain form of solid lead is 18 cm³/mol. Assuming cubic closet packed structure, determine the following: The volume of a single cell is what? | 1.20 x 10⁸ pm³ |
| The molar volume of a certain form of solid lead is 18 cm³/mol. Assuming cubic closet packed structure, determine the following: : The radius of a Pb atom is what? | 174 pm |
| Water sits in an open beaker. Assuming constant temperature and pressure, the rate of evaporation decreases as the water evaporates---correct or not? | not |
| Water sits in an open beaker. Assuming constant temeperature and pressure, the vapor pressure of the water decreases as water evaporates--is his completely true? | no |
| Generally the vapor pressure of a liquid is related to what? | temperature and intermolecular forces |
| A certain solid substance that is very hard, has a high melting point, and is nonconducting, unless melted is most likely to be which of the following? I₂ , NaCl , CO₂ , H₂O , or Cu ? | sodium chloride |
| A diamond is a ____________ crystal. | covalent |
| _______________ crystals usually have low melting points. | molecular |
| ____________ crystals are usually good electrical conductors. | metallic |
| In the UNIT CELL of sphalerite,Zn² ions occupy half the tetrahedral holes in a facecentered cubic lattice of S^2- ions. The number of formula units of ZnS in the unit cell is what? | 4 zincsuldide units in the unit cell |
| 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 centered of each face. The unit cell consists of a net of how many anions and cations? | three negatively charged ions and four positively charged ions |
| Statements true about ____________ include (i) it will conduct electricity (ii) the number of atoms surrounding each Cu atom is 12 (iii) (d) the solid has a cubic closet-packed structure (iv) the length of a face diagonal is four times the atom's radius | Solid copper |
| Eight unit cells are share an atom lying at the corner of a unit cell in any what? | cubic lattice |
| H2O can exist as only what at normal atmospheric pressure and temperature of ZERO degrees Celcius? | ice and water |
| The bonds between hydrogen and oxygen in a water molecule can be characterized as ____________. | dispersion forces |
