Science - Combined - 0653 CIE

Kinetic Particle Model Of Matter Continued

Muhtasari

Everything around you is made of countless tiny particles in constant motion. This single idea, the kinetic particle model, explains why solids hold their shape, why gases push on their containers, and why a balloon shrinks in the cold. It even has visible evidence you can watch under a microscope.

In this lesson you will picture the arrangement and motion of particles in solids, liquids and gases, link temperature to particle energy down to absolute zero, explain gas pressure and Brownian motion in terms of collisions, and use \(pV=\text{constant}\) to predict how a gas responds to a change in volume.

Malengo

  1. [Supplement] Describe qualitatively, in terms of particles, the effect on the pressure of a fixed mass of gas of: (a) a change of temperature at constant volume (b) a change of volume at constant temperature

Maelezo ya Somo

The kinetic particle model is one of the most powerful ideas in physics: from it you can explain states of matter, temperature, pressure, expansion and the behaviour of gases, all from the picture of moving particles. It also gives examiners endless ways to ask 'explain in terms of particles', so the reasoning here is worth a great many marks.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Kinetic Particle Model Of Matter Continued. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. In which state are the particles far apart and moving quickly in all directions? A. solid B. liquid C. gas D. all equally Answer: C
  2. Convert 27 C to kelvin: A. 246 K B. 300 K C. 273 K D. 327 K Answer: B
  3. A gas at 100 kPa and 0.6 m3 is compressed to 0.2 m3 at constant temperature. The new pressure is: A. 33 kPa B. 100 kPa C. 200 kPa D. 300 kPa Answer: D
  4. Gas pressure on a container wall is caused by: A. particles pushing each other B. particles colliding with the walls C. gravity on the gas D. the walls vibrating Answer: B
  5. Brownian motion of a smoke particle is caused by: A. heating the smoke B. air currents only C. collisions with fast-moving air molecules D. light from the microscope Answer: C

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