CHEM 102 EXAM 1

Question 1

Few elements that exist as gases at room temperature

Answer 1

Noble gases, hydrogen, oxygen, nitrogen, fluorine

Question 2

Molecular compounds that are gases at room temperature

Answer 2

HCl, NH3, CO2, N2O, CH4, HCN (hydrogen chloride, ammonia, carbon dioxide, dinitrogen monoxide, methane, hydrogen cyanide

Question 3

kinetic molecular theory (4 assumptions)

Answer 3

1. a gas is composed of particles that are separated by relatively large distances. volume occupied by individual molecules = negligible
2. gas molecules are constantly in random motion moving in straight paths, colliding with walls of container and with one another in perfectly elastic collisions
3. gas molecules do not exert attractive or repulsive forces on one another.
4. average kinetic energy of gas molecules are proportional to absolute temperature

Question 4

Boyle’s Law

Answer 4

pressure of a fixed amount of gas at a constant temperature is inversely proportional to volume of the gas

Question 5

Charles’ Law

Answer 5

Volume of an ideal gas is directly proportional to temperature

Question 6

Kinetic energy gas constant?

Answer 6

8.314J/K*mol

Question 7

Volume is directly proportional to what and inversely proportional to what?

Answer 7

Directly proportional to temperature and inversely proportional to pressure

Question 8

Ideal gas constant?

Answer 8

0.08206 Latm/Kmol

Question 9

1 atm = ?

Answer 9

760 torr/ 760 mmHg / 101 kPa / 1.01 bar

Question 10

London Dispersion Forces occur when?

Answer 10

All the time, but is the only force in nonpolar molecules

Question 11

Dipole-Dipole occur when?

Answer 11

Polar molecules

Question 12

Hydrogen bonding occurs when?

Answer 12

Between Hydrogen and Oxygen, Nitrogen or Fluorine

Question 13

Ionic Solid properties?

Answer 13

hard, brittle, melting point, poor conductor of heat and electricity (Ionic)

Question 14

Covalent crystal properties?

Answer 14

hard, brittle, melting point, poor conductor of heat and electricity
diamond, graphite, quartz

Question 15

Molecular solid properties?

Answer 15

soft, low melting point, poor conductor of heat and electricity
dispersion and dipole dipole forces

Question 16

metallic crystal?

Answer 16

variable hardness and melting point, good conductor of heat and electricity