Calculators May Not Be Used on Multiple Choice Questions

AP ChemistryName :

Worksheet : Ch 10-1Date :

CALCULATORS MAY NOT BE USED ON MULTIPLE CHOICE QUESTIONS

_____ 1. Held together by London Dispersion forces

_____ 2. Lattice of positive and negative ions held together by

electrostatic forces

_____ 3. Closely packed lattice with delocalized electrons

_____ 4. Held together by network covalent bonds

_____ 5. Has strong hydrogen bonding

_____ 6. Mg

_____ 7. MgCl2

_____ 8. C (diamond or graphite)

_____ 9. Si

_____ 10. Solid Xe

_____ 11. SiO2

_____ 12. Which of the following molecules will not hydrogen bond?

a. C3H8b. H2Oc. H2Sd. NH3e. C2H5OH

_____ 13. Which of the following molecules will not exhibit London Dispersion forces?

a. Xeb. CH4c. CO2d. H2Oe. none of the above

_____ 14. Which of the following would have the highest melting point?

a. Heb. Nec. Ard. Kre. Xe

_____ 15. Which of the following would have the lowest vapor pressure?

a. CH3OHb. C2H5OHc. C3H7OHd. C4H9OHe. C6H11OH

_____ 16. Which of the following would have the lowest melting point?

a. HIb. HBrc. HCld. HF

17. Identify the most important types of interparticle forces present in the solids of each of the following substances.

a. H2S

b. C2H6

c. P4

18. Predict which substance in each of the following pairs wouldhave the greater intermolecular forces.

a. CO2 or OCS

b. PF3 or PF5

c. SF2 or SF6

d. SO3 or SO2

19. Rationalize the difference in boiling points for each of the following pairs of substances:

20. In each of the following groups of substances, pick the one that has the given property. Justify each answer.

a. Highest boiling point: N2, O2, or NO

b. Smallest surface tension: H2O, CH3CN, or CH3OH

c. Lowest freezing point: H2, CH4, or CO

d. Smallest vapor pressure at 25°C: CO2, H2O, or SO2

21. Hydrogen peroxide (H2O2) is a syrupy liquid with a relatively low vapor pressure and a normal boiling point of 152.2°C. Rationalize the differences of these physical properties from those of water.

22. What type of solid will each of the following substances form?

a. CO2

b. SiO2

c. Si

d. CH4

e. Ru

f. I2

23. The nonpolar hydrocarbon, C25H52, is a solid at room temperature. Its boiling point is greater than 400°C. Which has the stronger intermolecular forcesC25H52or H2O? Explain your answer.

24. How could you tell experimentally if TiO2 is an ionic solid or a network solid?

Answers : 17a. dipole interaction17b. LD only (C-H bonds are nonpolar) 17c. LD only 18a. OCS – polar and therefore has dipole forces 18b. PF3 – polar 18c. SF2 – polar 18d. SO2 – polar 19a. neopentane – more compact, less surface area and weaker LD forces 19b. ethanol is polar and has H-bonding 19c. HF –polar, H-bonding 19d. LiCl – is ionic and therefore has a high melting point 19e. n-pentane – larger, stronger LD 24f. dimethyl ether is polar and has dipole interaction 20a. NO – polar 20b. CH3CN – polar w/o H-bonding (C-H bonds are nonpolar) 20c. H2 – nonpolar, smaller – weaker LD 20d. H2O – polar, H-bond 21. H2O2 -has the structure H-O-O-H and is has ore H-bonding than water. Longer molecules tend to tangle. 22a. molecular 22b. covalent network 22c. atomic, covalent network 22d. molecular 22e. atomic, metallic 22f. molecular 23. C25H52 – larger and therefore greater LD forces than H-bonding or dipole interaction. At room temp C25H52 (wax) is a solid and water is a liquid.