← LCC Chem exam 2 Test
5 Written Questions
5 Matching Questions
- Kinetic Molecular Theory for Gases
- a Standard Temperature and Pressure. 273 Kelvin (0 Celsius), 1 atmosphere (760 torr, 760 kPA).
- b Substance that dissolves in water. Conducts electricity
- c Interaction of water and it's solute particles
- d Portion of the universe under investigation
- e 1. Gas molecules move randomly in a linear fashion.
2. Volume occupied by molecules is negligible.
3. The attractive forces molecules are negligible.
4. The time during which a collision occurs is very short compared to the time btn collissions.
5. The avg. KE of molecules is directly proportional to the Kelvin temperature.
5 Multiple Choice Questions
- 1. Water soluble salts are strong electrolytes
2. Almost all molecular compounds are non-electrolytes EXCEPT Strong acids
3. Strong acids are strong electrolytes (6).
4. Group 1a and 2a hydroxides are strong bases therefore strong electrolytes.
- Enthalpy change that occurs when 1mole of a substance is formed from its elements in their most stable state at 25'C and 1atm.
- Energy is neither created nor destroyed in a chemical reaction.
- Oxygen, Iodine, Chlorine, Nitrogen, Hydrogen, Fluorine, Bromine
- Amount of heat required to raise the temp. of an object by exactly 1'C.
5 True/False Questions
Dalton's Law of Partial Pressure → If a reaction can be carried out in a serious of steps, the change in energy for the overall reaction is the sum of the change of energy of the individual steps.
Endothermic → Heat flow from surroundings into the system. (q=+#)
Effusion → Process where a gas escapes through a hole in its container into a vacuum.
Exothermic → heat flow from system out to surroundings.
(q= - #)
Calorimeter → Substance that dissolves in water. Conducts electricity