Kinetic Particle Model Of Matter

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Apuntes de la lección

States of Matter

Solids have a definite shape and volume; cannot flow; not compressible.
Liquids have no definite shape but a definite volume; can flow; not compressible.
Gases have no definite shape or volume; can flow; highly compressible.
Changes of state are physical changes (reversible); mass and number of molecules remain constant.
Melting: solid → liquid; freezing: liquid → solid.
Boiling/evaporating: liquid → gas; condensing: gas → liquid.

The three states of matter

Molecular Matter – Particle Arrangement & Motion

In a solid, particles are closely packed in a regular pattern and vibrate about fixed positions.
In a liquid, particles are close but randomly arranged; they can slide past each other.
In a gas, particles are widely spaced (~10× apart in each direction) and move rapidly and randomly.
Density: solid (high), liquid (medium), gas (low).
Intermolecular forces are strongest in solids, weaker in liquids, and negligible in gases.
Particles in a gas have the highest kinetic energy; in a solid the lowest.

Particle arrangement and motion in solids, liquids and gases

Temperature & Pressure

Increasing temperature increases the average speed and kinetic energy of particles.
Gas pressure is defined as force per unit area: p = \frac{F}{A} .
Pressure arises from collisions of gas particles with container walls, producing a force perpendicular to the wall.
At constant volume, higher temperature → more frequent and forceful collisions → higher pressure.

Gas particles colliding with a container wall

Brownian Motion

Brownian motion is the random, erratic movement of visible particles (e.g., pollen, smoke) suspended in a fluid.
It is caused by collisions with invisible, fast-moving atoms or molecules of the fluid.
Each collision gives the visible particle a small nudge, changing its speed and direction randomly.
This provides evidence for the kinetic theory of matter – that all matter is made of moving particles.

Brownian motion

The Gas Laws (Extended Tier Only)

Boyle’s Law: at constant temperature, pressure p is inversely proportional to volume V ( pV = constant).
Compressing a gas (decrease volume) increases pressure because particles hit walls more often.
Pressure–Temperature Law: at constant volume, pressure is directly proportional to absolute temperature ( p \propto T ).
Heating a gas at constant volume increases particle speed, leading to more frequent and forceful collisions → pressure rises.

Boyle's Law demonstration

Diapositivas

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Preguntas de práctica

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1.What causes the motion of smoke particles when viewed through a microscope?
Easy
- AThe smoke particles are attracted to each other.
- BThe smoke particles vibrate because they are warm.
- CSmaller air particles are colliding with the smoke particles.
- DThe microscope is vibrating slightly, making the smoke particles appear to move.
2.A sealed piston is used to expand a gas at constant temperature. What happens to the density and pressure of the gas?
Medium
- ADensity stays the same, pressure stays the same
- BDensity increases, pressure decreases
- CDensity decreases, pressure stays the same
- DDensity decreases, pressure decreases
3.Which state of matter has molecules that are very close together in fixed positions, vibrating about these positions?
Easy
- ASolid
- BLiquid
- CGas
- DPlasma
4.Air is trapped inside a cylinder of fixed volume. The temperature of the air is increased. Which graph shows the correct relationship between pressure and temperature?
Medium
- AA straight line through the origin (pressure proportional to temperature)
- BA curve increasing with decreasing gradient
- CA horizontal line (pressure constant)
- DA curve decreasing with increasing gradient
5.A beaker of water at its boiling point (100 °C) is heated so that liquid becomes gas at the same temperature. Which row correctly compares the liquid and gas phases?
Medium
- AAverage distance between particles: same; Average speed: same
- BAverage distance: greater in liquid; Average speed: greater in gas
- CAverage distance: greater in gas; Average speed: greater in liquid
- DAverage distance: greater in gas; Average speed: same
6.A sealed plastic drinks bottle is left in sunshine on a warm day. What happens to the average speed of air molecules and the pressure inside?
Medium
- ASpeed increases, pressure increases
- BSpeed increases, pressure decreases
- CSpeed decreases, pressure increases
- DSpeed decreases, pressure decreases
7.In an experiment, tiny pollen grains are suspended in water and observed under a microscope. They appear as small bright dots moving randomly. What is the correct explanation?
Medium
- AThe bright dots are water molecules being hit by other water molecules.
- BThe bright dots are water molecules vibrating due to thermal kinetic energy.
- CThe bright dots are pollen grains being hit many times per second by water molecules.
- DThe bright dots are pollen grains vibrating due to their thermal kinetic energy.
8.A syringe half filled with air is sealed and the plunger pulled out slowly at constant temperature. What happens to the pressure and the speed of air molecules?
Medium
- APressure stays the same, speed stays the same
- BPressure increases, speed decreases
- CPressure decreases, speed stays the same
- DPressure decreases, speed decreases

Más preguntas

9.Fill in the blanks to describe the arrangement and motion of particles in a solid.
Easy
In a solid, the particles are arranged in a ____ pattern and they ____ about fixed positions.
10.State the name of the random motion of particles suspended in a fluid, caused by collisions with smaller, fast-moving molecules.
Easy
11.The diagram shows the arrangement of particles in the three states of matter. Which state is represented by the leftmost diagram?
Easy
- ASolid
- BLiquid
- CGas
- DPlasma
12.The diagram shows the particle model for a gas. What happens to the pressure if the temperature is increased at constant volume?
Easy
13.Which statement about the particles in a solid is correct?
Easy
- AThey are arranged in a regular pattern and vibrate about fixed positions.
- BThey are randomly arranged and can slide past each other.
- CThey are widely spaced and move quickly in all directions.
- DThey are arranged in a regular pattern and can move freely.
14.In a liquid, the particles are arranged in a regular pattern.
Easy
True or false?
15.A substance changes from a liquid to a gas. What is the name of this change of state?
Easy
- AMelting
- BBoiling
- CCondensing
- DFreezing
16.A sealed container of gas is heated at constant volume. What happens to the pressure and the average speed of the gas molecules?
Medium
- APressure increases, average speed increases.
- BPressure increases, average speed decreases.
- CPressure decreases, average speed increases.
- DPressure decreases, average speed decreases.
17.Match each state of matter to the correct description of particle arrangement and motion.
Easy
- Solid
- Liquid
- Gas
- Random arrangement, particles slide past each other
- Regular arrangement, particles vibrate about fixed positions
- Random arrangement, particles move quickly in all directions
18.Brownian motion can be observed by looking at smoke particles in air under a microscope.
Easy
True or false?
19.Which of the following statements about gases are correct? (Select all that apply.)
Medium
- AGas particles are widely spaced.
- BGas particles have strong intermolecular forces.
- CGas particles move randomly at high speeds.
- DGases are highly compressible.
- EGas particles have a fixed volume.
20.Arrange the following changes of state in the correct order for a substance going from solid to gas: (a) melting, (b) boiling, (c) freezing, (d) condensing.
Easy
- melting
- boiling
- freezing
- condensing
21.Which of the following are true about the kinetic particle model of matter? (Select all that apply.)
Medium
- AAll matter is made up of tiny particles in constant motion.
- BParticles in a solid have more energy than particles in a gas.
- CBrownian motion provides evidence for the existence of atoms and molecules.
- DIn a liquid, particles are arranged in a regular pattern.
- EGases are highly compressible because of the large spaces between particles.
22.When a substance changes state, its mass changes.
Easy
True or false?
23.A sealed syringe contains air. The plunger is pushed in slowly at constant temperature. What happens to the pressure and the average speed of the air molecules?
Medium
- APressure increases, average speed increases
- BPressure increases, average speed remains the same
- CPressure decreases, average speed increases
- DPressure decreases, average speed remains the same
24.A sealed container of gas is heated at constant volume. Which graph shows the correct relationship between pressure (P) and temperature (T in Kelvin)?
Medium
- AA straight line through the origin
- BA curve that increases then flattens
- CA horizontal line
- DA straight line with positive y-intercept
25.Which statement about Brownian motion is correct?
Easy
- AIt is the random motion of large particles caused by collisions with smaller particles.
- BIt is the regular vibration of particles in a solid.
- CIt is the motion of particles in a liquid as they slide past each other.
- DIt is the motion of gas molecules in a straight line.
26.Arrange the following in order of increasing particle energy: solid, liquid, gas.
Easy
- solid
- liquid
- gas
27.A student observes smoke particles in air under a microscope. The smoke particles move randomly. What is the main cause of this motion?
Medium
- ACollisions with fast-moving air molecules
- BGravity acting on the smoke particles
- CConvection currents in the air
- DThe smoke particles repelling each other
28.A sealed container of gas is heated at constant volume. Which graph correctly shows the relationship between pressure (P) and temperature (T in Kelvin)?
Medium
- AA straight line through the origin
- BA curve that increases then flattens
- CA straight line with a positive intercept on the pressure axis
- DA curve that decreases as temperature increases
29.Match each change of state to its correct description.
Easy
- Melting
- Boiling
- Condensing
- Freezing
- Solid to liquid
- Liquid to gas
- Gas to liquid
- Liquid to solid
30.A sealed syringe containing air has its plunger pushed in slowly at constant temperature. What happens to the pressure and the average speed of the air molecules?
Medium
- APressure increases, average speed stays the same
- BPressure increases, average speed increases
- CPressure decreases, average speed stays the same
- DPressure decreases, average speed decreases
31.A student investigates Brownian motion using smoke particles in air under a microscope. The student notices that the smoke particles move randomly. Which statement explains this observation?
Medium
- AThe smoke particles are being pushed by air molecules colliding with them.
- BThe smoke particles are moving because they are alive.
- CThe smoke particles are repelling each other.
- DThe smoke particles are attracted to the glass slide.
32.A fixed mass of gas is trapped in a syringe. The plunger is pushed in slowly, reducing the volume while the temperature remains constant. What happens to the pressure and the average speed of the gas molecules?
Medium
- APressure increases, average speed stays the same.
- BPressure decreases, average speed stays the same.
- CPressure increases, average speed increases.
- DPressure decreases, average speed decreases.
33.In a solid, the particles vibrate about fixed positions.
Easy
True or false?
34.Liquids have a definite shape.
Easy
True or false?
35.Which of the following is a correct description of the particles in a gas?
Easy
- AParticles are closely packed and vibrate about fixed positions.
- BParticles are closely packed and can slide past each other.
- CParticles are far apart and move randomly at high speeds.
- DParticles are far apart and vibrate about fixed positions.
36.What is the name of the change of state from a liquid to a gas?
Easy
- AMelting
- BFreezing
- CCondensing
- DBoiling
37.Which of the following statements about Brownian motion are correct? (Select all that apply.)
Medium
- AIt is the random motion of large particles suspended in a fluid.
- BIt is caused by collisions with smaller, fast-moving molecules.
- CIt can only be observed in gases.
- DIt was first described by Robert Brown.
38.Which of the following statements about the kinetic particle model are correct? (Select all that apply.)
Hard
- AParticles in a solid are arranged in a regular pattern.
- BParticles in a liquid have more energy than particles in a gas.
- CParticles in a gas are widely separated and move randomly.
- DWhen a substance changes state, its mass changes.
- EBrownian motion is caused by collisions with smaller, fast-moving particles.
39.A fixed mass of gas is trapped in a cylinder with a movable piston. The gas is compressed slowly at constant temperature. Which statement about the gas molecules is correct?
Medium
- AThe average speed of the molecules increases.
- BThe molecules collide with the walls more frequently.
- CThe molecules become smaller in size.
- DThe number of molecules increases.
40.A student uses a vacuum pump to remove air from a sealed container containing a tied-up balloon at constant temperature. What happens to the volume of the balloon and the pressure inside it?
Hard
- AVolume increases, pressure inside balloon decreases
- BVolume decreases, pressure inside balloon increases
- CVolume increases, pressure inside balloon increases
- DVolume decreases, pressure inside balloon decreases
41.Arrange the following changes of state in the correct order for a substance going from gas to solid: (a) freezing, (b) condensing, (c) melting, (d) boiling.
Medium
- melting
- boiling
- condensing
- freezing
42.Match each description of particle arrangement and motion to the correct state of matter.
Easy
- Particles vibrate about fixed positions
- Particles slide past each other
- Particles move quickly in all directions
- Solid
- Liquid
- Gas
43.Which of the following is a property of a solid?
Easy
- AIt has no definite shape and no fixed volume.
- BIt has a definite shape and a definite volume.
- CIt has no definite shape but a definite volume.
- DIt can flow and is highly compressible.
44.Fill in the blanks to complete the sentence.
Easy
In a gas, the particles are ____ apart and move ____ in all directions.
45.A gas exerts a force of 200 N on a surface of area 0.5 m². Calculate the pressure exerted by the gas in pascals.
Medium
46.Name the three states of matter in order of increasing particle energy.
Easy
Solid, ____, ____
47.A gas exerts a force of 300 N on a surface of area 2.0 m². Calculate the pressure exerted by the gas in pascals.
Medium
48.Complete the sentence about changes of state.
Easy
The process in which a liquid turns into a gas is called ____. The reverse process, where a gas turns into a liquid, is called ____.
49.Describe what happens to the pressure of a fixed mass of gas at constant volume when the temperature increases.
Medium
50.A gas exerts a force of 500 N on a surface of area 0.25 m². Calculate the pressure exerted by the gas in pascals.
Medium
51.Complete the sentence.
Easy
The three states of matter are ____, ____, and ____.
52.State the name of the change of state when a solid turns into a liquid.
Easy
53.Explain, in terms of particles, why the pressure inside a car tyre increases when the car is driven for a long time.
Medium
54.Describe the arrangement and motion of particles in a gas.
Easy
55.Describe an experiment to demonstrate that the pressure of a fixed mass of gas increases when its temperature is increased at constant volume. Include the equipment needed and the expected results.
Hard
56.Describe an experiment to demonstrate that the pressure of a fixed mass of gas increases when its temperature is increased at constant volume. Include the equipment needed and the expected result.
Hard
57.A gas exerts a force of 200 N on a surface of area 0.5 m². Calculate the pressure exerted by the gas in pascals.
Easy
- A360 Pa
- B400 Pa
- C440 Pa
- D480 Pa
58.A gas exerts a force of 300 N on a surface of area 2.0 m². Calculate the pressure exerted by the gas in pascals.
Easy
- A165 Pa
- B180 Pa
- C135 Pa
- D150 Pa
59.A gas exerts a force of 500 N on a surface of area 0.25 m². Calculate the pressure exerted by the gas in pascals.
Easy
- A2400 Pa
- B2000 Pa
- C1800 Pa
- D2200 Pa

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