Forms of Matter: Gases Flashcards
Unit Exam
What are the properties of Gases
- Gases are compressible
2.Gases expand as temperature is increased
3.Gases have very low viscosity - Gases have much lower densities then solids or liquids
- Gases are miscible
Explain the property “Gases are compressible”
The volume of a gas decreases dramatically when pressure is exerted on the gas because molecules are spaced further apart then liquids
Explain the property “ Gases expand as temperature is increased”
Only when pressure remains constant, and that is because molecules are moving faster and have more kinetic energy
Explain the property “ Gases have very low viscosity”
They have low resitant to flow
Explain the property “ Gases have much more lower densities then solids or liquids”
There is more space between particles.
Explain the peroperty “Gases are miscible”
They mix completely and evenly with eachother when put in the same container
What is the kinetic molecular theory(KMT)
It is a theory that provides a scientific moedel for explaining the behavior of gases
What is an ideal gase
A hypothetical gas that obeys all gas laws perfectly under all conditions
What is a real gas
real gases deviate from ideal gases under certain coniditons
One difference between ideal gases and real gases
Ideal gas molecules are very far apart, so the molecules sizes are negligible.
Real gases(under high pressures) the molecules are close together so their sizes are significant.
Another difference between ideal gases and real gases
Ideal gases are in constant straight line motion because no force exists between them. Realgases(as temperature decreases) molecules slow down, then at some point intermolecular attractions cause molecules to stick together then it turns into liquid.
Aother difference between ideal and real gases
Ideal gase molecules undergo perfect elastic collisions i which no energy is lost and the rebound happens quickly. During collision real gas molecules shape changes and rebound happens slower.(meaning pressure is less then ideal(
What is gas pressure
gas pressure is a measure of the force exerted by moving gas molecules per unit area.
What is atomispheric pressure
It is the force per unit are exrted by air on all objects
State the conversion units
760mmHg=1atm=101.325kPa