CHEM Test 6 (11th) 21-22

Molecules of an ideal gas are

• crashing all time between themselves

• crashing all time against the vessel

• crashing all time between themselves and against the vessel

Due to the constant collision of molecules, we conclude that

• all molecules are moving at the same speed

• all molecules are moving at different speeds

• none

 $\frac{\Delta v}{\Delta t}$  

• acceleration

• force

• pressure

Since the molecules of a gas have acceleration, we conclude that

• each molecule is exercitng a force upon other molecules and on the vessel

• each molecule does no have force at all on the vessel

• none

 $mass\cdot acceleration$  

• Force

• Pressure

• Velocity

Knowing the force a molecule is exerting on the vessel is useless, since there are too many molecules (  $10^{23}$ ) .

How can we fix this problem?

 $\frac{F_{average}}{A_{vessel}}$  

• Pressure of a gas

• Force of a liquid

• Acceleration

Pressure can be defined as

• the average force excerted by all molecules on the internal area of the vessel

• the internal area of the vessel divided by the average force excerted by all molecules

• none

Pressure is ____________ to the velocity of molecules

• directly proportional

• inversely proportional

• none

 $\frac{1}{2}mv^2$  

• Kinetic Energy

• Potential Energy

• Elastic Energy