Chemistry - Chapter 14 Flashcards Preview

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Flashcards in Chemistry - Chapter 14 Deck (18):
1

Define an Ideal Gas

it's an imaginary gas that follows the five assumptions

2

Define a Real Gas

an actual gas; its behavior deviates most from an ideal gas at HIGH pressures and LOW temperatures

3

What is gas pressure a result of?

Of gas particles colliding with surfaces

4

Atmospheric Pressure is a result of...?

when is there less pressure?

A result of the gases in the atmosphere

there is less pressure at higher altitudes

5

What does STP stand for?

Standard Temperature and Pressure

6

what is the standard temperature?

O°C or 273°K

7

what is the standard pressure?

1 atm or 760mm Hg (torr)

8

What is the relationship in Boyle's law?

Pressure and Volume = INVERSELY related

9

What is the relationship in Charles's Law?

Temperature and Volume = DIRECTLY related

10

What is the relationship in Gay-Lussac's Law?

Pressure and Temperature = DIRECTLY related

11

What is Dalton's Law?

P[total] = P[1] + P[2] + ... + P[n]

12

Combined Gas Law (3)

- Combines all three gas laws into one

(P[1]V[1]) / (T[1]) = (P[2]V[2]) / (T[2])

- must use absolute temperature scale (kelvin) --> °C + 273 = °K

13

what equation is used to bring together gas properties?

(3)

PV = nRT

R = 8.31

it can be derived from experiment and theory

14

must use kelvin scale on which gas law(s)? (2)

- combined gas law
- ideal gas law

15

define diffusion

the gradual mixing of molecules of different gases

16

define effusion

the movement of molecules through a small hole into an empty container

17

effusion and diffusion... (2)

are related to how fast the gas particles are moving

*lighter gas particles move faster than heavier gas particles

18

Equation to find the effusion rate / ratio

what is the relationship in the effusion

(Rate for A) / (Rate for B) = [*square root of* (Mass of B) / (Mass of A)]

the rate of effusion is inversely proportional to its molar mass