States Of Matter Y11 Flashcards Preview

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Flashcards in States Of Matter Y11 Deck (11)
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1

What happens in evaporation?

• most energetic water particles turn to gas and escape the water
∴ the average KE of the remaining molecules has decreased ∴ the temperature of the puddle decreased
This is why sweating cools you

2

What is Brownian motion?

Particles are constantly moving around randomly

3

What is Boyle's law?

• if temp and mass constant then pressure and volume are inversely proportional
P1 x V1 = P2 x V2
• straight line through origin

4

What is the relationship between temperature and pressure?

• if volume and mass are constant, as pressure increases, temperature increases
P1 / T1 = P2 / T2 (only when temp in K)
• if gas is heated, then particles gain KE ∴ move around faster. ∴ will collide w container walls more ∴ pressure will increase

5

How do gases exert pressure?

• av KE is proportional to temp in K
• the gas molecules move around and hit container walls
• this causes a small force
• this causes pressure (force/area)

6

What is the arrangement of particles in a solid?

• close together and regular pattern
• vibrate on the spot

7

What is the arrangement of particles in a liquid?

• close together
• random arrangement
• move around each other

8

What is the arrangement of particles in a gas?

• far apart and random arrangement
• move quickly in all directions

9

What is absolute 0? What happens here?

• -273 °C, 0 K
• particles have no KE ∴ stationary ∴ exert no pressure on container

10

How do you work out temperature in Kelvin?

Temp in K = temp in Celsius + 273

11

What happens re pressure when you heat up gas molecules?

• Gain KE ∴ more faster
• therefore collide w walls more frequently, causing a bigger force
• increase in pressure