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Medical physics > Gases > Flashcards

Gases Flashcards

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1
Q

Which forces are weak in gases compared to liquids and solids?

A

Cohesion forces

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2
Q

2 kinds of gases

A

Perfect/ideal gases
Real gases

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3
Q

When are gases perfect/ideal?

A

Volume is negligible
No forces of attraction or repulsion exerted
No loss of energy during collisions (perfectly elastic collisions)

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4
Q

Equation of state that ideal gases obey

A

pV=nRT

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5
Q

What is absolute zero?

A

Lowest possible temperature theoretically possible to reach where thermal motion of particles cease entirely

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6
Q

What does Avogadro’s law state?

A

That at the same pressure, temperature and volume different gasses contain the same number of molecules

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7
Q

pV=? at constant temperature

A

Constant

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8
Q

What is an isothermal transformation?

A

Transformation under constant temperature

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9
Q

At constant pressure V=?* T

A

Constant

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10
Q

What is an isobaric transformation?

A

Transformation where the pressure is constant. The volume of the gas is proportional to the temperature

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11
Q

What is the first law of Gay-Lussac (Charles’ law)?

A

At constant pressure, the volume of a gas is directly proportional to its absolute temperature
Va/Ta=Vb/Tb

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12
Q

p=?*T at constant volume?

A

Constant

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13
Q

What is an isochoric transformation?

A

Transformation at constant volume.
The gas pressure is proportional to the temperature

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14
Q

Formula for second law of Gay-Lussac

A

pa/Ta=pb/Tb
At constant volume

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15
Q

What happens to (atmospheric pressure) when altitude increases?

A

Pressure decreases

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16
Q

What kind of forces are present in real gases?

A

Non-negligible interaction forces (attractive or repulsive)

17
Q

What happens to kinetic and potential energy in gases when the temperature increases and the pressure decreases?

A

Potential energy decreases in favour of kinetic energy

18
Q

When does the behaviour of real gasses approach that of ideal gasses?

A

High temp, low pressure

19
Q

When are a liquid and a gas in equilibrium?

A

When gas pressure in the liquid equals the partial pressure of the gas
The number of molecules that enter the solution in the unit of time=number of molecule that evaporate

20
Q

What are perfect gasses considered?

A

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Medical physics (10 decks)

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