Solids Liquids And Gases

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Notes de leçon

Kinetic Theory & States of Matter

The kinetic theory describes matter as tiny particles in constant motion.
Solids: particles packed closely in a fixed, regular pattern; vibrate in position; high density.
Liquids: particles close but randomly arranged; slide past each other; adopt container shape; medium density.
Gases: particles far apart, move randomly and quickly (~500 m/s); low density; easily compressed.
Particle energy increases from solid (low) → liquid → gas (highest).

Particle arrangement in solids, liquids, and gases

Changes of State

Melting: solid → liquid at a specific melting point; requires heat to increase particle kinetic energy.
Freezing: liquid → solid at the same temperature as melting point.
Boiling: liquid → gas at a specific boiling point; bubbles form throughout the liquid.
Evaporation: liquid → gas at the surface, below boiling point; faster with larger surface area and higher temperature.
Condensation: gas → liquid on cooling; particles lose energy and group together.
State changes are reversible (⇌).

The state changes

Heating & Cooling Curves (Extended)

A heating curve shows temperature vs. time as a substance is heated.
Horizontal sections indicate a change of state with no temperature change (energy used to overcome forces).
A cooling curve is the mirror image of a heating curve.

A heating curve

Pressure & Temperature in Gases

Gas pressure is caused by particles colliding with container walls.
Increasing temperature increases particle kinetic energy → more frequent collisions → volume expands if container flexible.
Increasing pressure (same number of particles in smaller volume) decreases volume; particles hit walls more often.
If pressure is too high, container may leak or explode.

Pressure increases as volume decreases

Diffusion

Diffusion: net movement of particles from high to low concentration due to random motion.
Occurs in liquids and gases; no energy input required; faster at higher temperatures.
Diffusion is faster in gases than liquids because gas particles have more kinetic energy.
Example: potassium manganate(VII) in water spreads until evenly coloured.

Diffusion of potassium manganate(VII) in water

Diffusion & Molecular Mass (Extended)

At the same temperature, gases with lower relative molecular mass diffuse faster.
Example: ammonia (Mᵣ = 17) diffuses faster than hydrogen chloride (Mᵣ = 36.5).
In a tube, NH₃ and HCl react to form NH₄Cl; the white ring forms closer to the HCl end.

Diffusion of ammonia and hydrogen chloride

Diapos

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1.Which statement about the arrangement of particles in a solid is correct?
Easy
- AParticles are far apart and move randomly
- BParticles are close together and arranged randomly
- CParticles are close together in a fixed regular pattern
- DParticles are far apart and vibrate in fixed positions
2.Which statement about the movement of particles in a liquid is correct?
Easy
- AParticles vibrate about fixed positions
- BParticles move around each other
- CParticles move quickly in all directions
- DParticles do not move
3.In a gas, the particles are far apart and move randomly.
Easy
True or false?
4.State the term for the change of state from a solid to a liquid.
Easy
5.Water boils at 100 °C. What is the boiling point of water in Kelvin?
Easy
- A410
- B373
- C336
- D447
6.Complete the sentence about diffusion.
Easy
Diffusion is the movement of particles from an area of ____ concentration to an area of ____ concentration.
7.Match each state of matter with its particle arrangement.
Medium
- Solid
- Liquid
- Gas
- Randomly arranged
- Regular arrangement
- Randomly arranged
8.Ammonia (Mr = 17) and hydrogen chloride (Mr = 36.5) diffuse from opposite ends of a tube. Where does the white smoke of ammonium chloride form?
Hard
- AExactly in the middle of the tube
- BCloser to the ammonia end
- CCloser to the hydrogen chloride end
- DAt both ends equally

Plus de questions

9.Explain why the pressure of a gas increases when the volume of its container is decreased at constant temperature.
Medium
10.The diagram shows the particle arrangement in three states of matter, arranged left to right. Box X is the middle box. Which state is represented by box X?
Easy
- ASolid
- BLiquid
- CGas
- DPlasma
11.Look at the diagram showing particle arrangements. Identify the state where particles are close together but arranged randomly.
Easy
The state is ____.
12.In a solid, the particles are arranged in a fixed and regular pattern.
Easy
True or false?
13.Which state of matter has particles that are far apart and move randomly in all directions?
Easy
- ASolid
- BLiquid
- CGas
- DPlasma
14.Liquids have a fixed volume but take the shape of their container.
Easy
True or false?
15.What is the term for the change of state from a liquid to a solid?
Easy
- AMelting
- BFreezing
- CBoiling
- DCondensation
16.Evaporation occurs only at the surface of a liquid and at temperatures below its boiling point.
Medium
True or false?
17.Which of the following is NOT a property of gases?
Easy
- AFixed volume
- BLow density
- CParticles far apart
- DCan be compressed
18.During melting, the temperature of a pure substance remains constant until all the solid has melted.
Easy
True or false?
19.A student observes that a gas can be compressed easily. Which particle property explains this?
Easy
- AParticles are closely packed
- BParticles are far apart with empty space between them
- CParticles are fixed in position
- DParticles slide past each other
20.Diffusion occurs faster in liquids than in gases.
Easy
True or false?
21.Match each state of matter with the correct description of particle arrangement.
Medium
- Solid
- Liquid
- Gas
- Particles far apart and move quickly
- Particles close and in fixed positions
- Particles close but arranged randomly
22.Which of the following are properties of gases? Select all that apply.
Medium
- AFixed volume
- BLow density
- CEasily compressed
- DFixed shape
- EParticles far apart
23.During boiling, bubbles of gas form throughout the liquid.
Easy
True or false?
24.Which statement explains why a gas exerts pressure on the walls of its container?
Easy
- AGas particles are attracted to the container walls
- BGas particles collide with the container walls
- CGas particles expand to fill the container
- DGas particles have fixed positions
25.The diagram shows the particle arrangement in three states of matter. Which state has particles that are close together and arranged in a regular pattern?
Easy
- ASolid
- BLiquid
- CGas
- DPlasma
26.Which of the following correctly describe the behaviour of particles in a gas when the temperature is increased at constant volume? Select all that apply.
Medium
- AParticles move faster
- BParticles collide with container walls more frequently
- CParticles expand
- DPressure increases
- EParticles lose kinetic energy
27.Arrange the following in order of increasing density (lowest to highest).
Easy
- Gas
- Solid
- Liquid
28.A student investigates diffusion using a glass tube with cotton wool soaked in ammonia at one end and hydrogen chloride at the other. The tube is sealed. After some time, a white ring of ammonium chloride forms. Where does the ring form?
Medium
- ACloser to the ammonia end
- BCloser to the hydrogen chloride end
- CExactly in the middle of the tube
- DAt both ends equally
29.Which of the following statements about the kinetic theory of gases are correct? Select all that apply.
Medium
- AGas particles are in constant random motion.
- BIncreasing temperature increases the kinetic energy of gas particles.
- CGas particles are attracted strongly to each other.
- DGas pressure is caused by particles colliding with the walls of the container.
- EAt the same temperature, lighter gas particles move faster than heavier ones.
30.During boiling, bubbles of gas form only at the surface of the liquid.
Easy
True or false?
31.A heating curve for a pure substance rises from A to B (heating the solid), stays flat from B to C (melting), rises from C to D (heating the liquid), stays flat from D to E (boiling), then rises again after E (heating the gas). Which section corresponds to the substance being heated as a liquid?
Medium
- ASection from A to B
- BSection from B to C
- CSection from C to D
- DSection from D to E
32.Which of the following statements about the effect of increasing temperature on a gas in a sealed, rigid container are correct? (Select all that apply)
Medium
- AThe gas particles move faster
- BThe gas particles expand
- CThe pressure inside the container increases
- DThe number of particles increases
- EThe gas particles collide with the walls more frequently
33.Match each state change with its correct description.
Easy
- Melting
- Boiling
- Condensation
- Solid to liquid
- Liquid to gas
- Gas to liquid
34.Place the following events in the correct order to describe what happens when a solid is heated until it becomes a gas.
Medium
- Particles vibrate more and solid expands
- Solid melts into liquid
- Particles gain enough energy to overcome forces
- Liquid boils into gas
35.On a heating curve for a pure substance, which section represents the substance being heated as a liquid?
Medium
- AThe section where temperature is increasing and the substance is solid
- BThe horizontal section where melting occurs
- CThe section where temperature is increasing and the substance is liquid
- DThe horizontal section where boiling occurs
36.A student investigates the effect of temperature on the rate of diffusion of ammonia gas. Which of the following would increase the rate of diffusion?
Easy
- ADecreasing the temperature
- BIncreasing the temperature
- CIncreasing the pressure of the gas
- DUsing a gas with a higher molecular mass
37.Which of the following best describes the arrangement of particles in a liquid?
Easy
- AParticles are arranged in a fixed, regular pattern.
- BParticles are close together but arranged randomly.
- CParticles are far apart and move randomly.
- DParticles are close together and vibrate about fixed positions.
38.The particles in a solid vibrate about fixed positions.
Easy
True or false?
39.A gas is heated in a sealed, flexible container. What happens to the volume of the gas?
Medium
- AIt decreases.
- BIt increases.
- CIt stays the same.
- DIt becomes zero.
40.Match each state change with its correct name.
Easy
- Solid to liquid
- Liquid to gas
- Gas to liquid
- Melting
- Boiling/Evaporation
- Condensation
41.Complete the sentence.
Easy
The change of state from a gas to a liquid is called ____.
42.Fill in the blanks.
Easy
The three states of matter are ____, ____, and ____.
43.State the name of the process in which a solid changes directly into a gas.
Easy
44.A gas occupies 50 cm³ at a pressure of 100 kPa. If the pressure is increased to 200 kPa at constant temperature, what is the new volume in cm³?
Medium
45.Complete the sentence about state changes.
Easy
The change from a liquid to a solid is called ____.
46.State one factor that increases the rate of evaporation of a liquid.
Easy
47.A gas occupies 150 cm³ at a pressure of 100 kPa. If the temperature remains constant and the pressure is increased to 250 kPa, what is the new volume in cm³?
Medium
48.State the term for the change of state from a gas directly to a solid.
Easy
49.Explain why diffusion is faster in gases than in liquids.
Medium
50.A gas occupies 50 cm³ at a pressure of 100 kPa. If the pressure is increased to 200 kPa at constant temperature, what is the new volume in cm³?
Medium
- A22 cm³
- B31 cm³
- C28 cm³
- D25 cm³
51.A gas occupies 150 cm³ at a pressure of 100 kPa. If the temperature remains constant and the pressure is increased to 250 kPa, what is the new volume in cm³?
Medium
- A66 cm³
- B72 cm³
- C60 cm³
- D54 cm³

Cartes mémo

What are the three states of matter?

Solid, liquid, gas.

Describe the arrangement and movement of particles in a solid.

Particles are packed very closely together in a fixed, regular pattern and vibrate about fixed positions.

Describe the arrangement and movement of particles in a liquid.

Particles are close together but randomly arranged, and they move around each other, allowing the liquid to flow.

Describe the arrangement and movement of particles in a gas.

Particles are far apart, randomly arranged, and move quickly in all directions at around 500 m/s.

Why can gases be easily compressed?

Because there is a lot of space between the particles.

What is melting?

Melting is when a solid changes into a liquid at a specific temperature called the melting point.

What is freezing?

Freezing is when a liquid changes into a solid at the same temperature as the melting point.

What is boiling?

Boiling is when a liquid changes into a gas at a specific temperature called the boiling point, with bubbles forming throughout the liquid.

What is evaporation?

Evaporation is when a liquid changes into a gas at the surface, occurring over a range of temperatures below the boiling point.

What is condensation?

Condensation is when a gas changes into a liquid on cooling, over a range of temperatures.

How does heating affect the particles in a solid?

Heating causes the particles to vibrate more until the structure breaks and the solid melts into a liquid.

How does heating affect the particles in a liquid?

Heating causes the particles to move more and spread out; at the boiling point, all particles gain enough energy to escape as a gas.

What happens to the temperature during a change of state?

During a change of state, the temperature remains constant even though heat is being added or removed.

How does temperature affect the volume of a gas?

Increasing temperature increases the kinetic energy of particles, causing them to move faster and spread out, increasing the volume.

How does pressure affect the volume of a gas?

Increasing pressure decreases the volume because the same number of particles are forced into a smaller space.

What causes gas pressure inside a container?

Gas pressure is caused by particles colliding with the walls of the container.

Define diffusion.

Diffusion is the movement of particles from an area of high concentration to an area of low concentration due to random motion.

Why does diffusion occur faster in gases than in liquids?

Because gaseous particles have more energy and move faster than liquid particles.

How does molecular mass affect the rate of diffusion?

Gases with lower relative molecular mass diffuse faster (travel further in the same time) than those with higher molecular mass.

In the ammonia and hydrogen chloride diffusion experiment, where does the white smoke form?

The white smoke (ammonium chloride) forms closer to the hydrogen chloride end because ammonia (M_r=17) diffuses faster than HCl (M_r=36.5).

What is the kinetic theory of matter?

The kinetic theory describes matter as tiny particles in constant motion; the arrangement and movement differ in solids, liquids, and gases.

Why do liquids have a fixed volume but not a fixed shape?

Particles are close together (fixed volume) but randomly arranged and able to slide past each other, so the liquid takes the shape of the container.

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