Riverside City College Properties of Ionic Molecular Network Worksheet 1. Categorize the molecules and statements based on whether they are an example or p

Riverside City College Properties of Ionic Molecular Network Worksheet 1. Categorize the molecules and statements based on whether they are an example or property of an ionic solid, molecular solid, network (atomic) solid, or all three.

IonicMolecularNetwork (atomic)Describes all three

Answer Bank : Diamond, poor conductor in solid form, typically low melting points, composed of molecules,compound of ions, P4, Crystalline solid, graphite, good conductor of electricity when dissolved in solution, NaCl, composed of atoms connected by covalent bonds, nonconductor of electricity when dissolved in solution

2. Match each property of a liquid to what it indicates about the relative strength of the intermolecular forces in that liquid.

Strong intermolecular forcesWeak intermolecular forces

Answer Bank: high vapor pressure, high viscosity, high boiling point, high surface tension

3. If a solid line represents a covalent bond and a dotted line represents intermolecular attraction, which of the choices shows a hydrogen bond?

H−HH2O⋅⋅⋅⋅⋅⋅H−CH3H3N⋅⋅⋅⋅⋅⋅H−O−HH4C⋅⋅⋅⋅⋅⋅H−F

4.Which of the substances have polar interactions (dipole–dipole forces) between molecules?

Cl2NF3ClFF2

5.Which substances exhibit only London (dispersion) forces?

H2OCl2HeHCl

6.Classify each substance based on the intermolecular forces present in that substance.

Hydrogen bonding, dipole–dipole, and dispersionDipole–dipole and dispersion onlyDispersion only

Answer Bank : H2, HCl, HF, CO

7. How much heat energy is required to convert 62.5 g

of liquid sulfur dioxide, SO2, at 208.6 K to gaseous SO2 at 263.1 K if the molar heat of vaporization of SO2 is 24.9 kJ/mol, and the specific heat capacity ( ) of liquid SO2 is 1.36 J/(g·∘C)?

=

kJ

8. How much heat energy is required to convert 88.3 g

of solid iron at 27 ∘C to liquid iron at 1538 ∘C? The molar heat of fusion of iron is 13.8 kJ/mol. Iron has a normal melting point of 1538 ∘C. The specific heat capacity of solid iron is 0.449 J/(g·∘C).

=

kJ

9. How much heat energy is required to melt 772.6 g

of HBr? The molar heat of fusion of HBr is 2.41 kJ/mol.

=

kJ

10.

How many grams of benzene, C6H6, can be melted with 54.0 kJ of heat energy? The molar heat of fusion of benzene is 9.95 kJ/mol.

____g

11. How much heat energy is required to boil 95.2 g

of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.

=

kJ

12. How many grams of ethanol, C2H5OH,

can be boiled with 277.4 kJ of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol.

mass of ethanol:

g

13. Label the heating curve with the phase or phases present. Assume constant pressure.

Answer Bank: liquid only, gas only, solid and liquid , liquid and gas , solid only

14. Use the changes of state interactive to answer the question.

Find the melting point and boiling point of each substance.

melting point of water:

°C

boiling point of water:

°C

melting point of bromine:

°C

boiling point of bromine:

°C

melting point of benzene:

°C

boiling point of benzene:

°C

15. Use the changes of state interactive to answer the question.

Identify the states of matter present at various points along the phase change diagram for water. The ‑axis shows the energy added. The ‑axis measures temperature in degrees Celcius.

answer bank : liquid only, gas only, solid and liquid , liquid and gas , solid only