phet: states of matter
name
introduction: there are more states of matter than just three. one such example is plasma, present in your plasma tv, or in the stars, and it is the most common state of matter in the universe. in chemistry, however, we are mainly concerned with the most common states of matter on planet earth: solids (s), liquids (l), and gases (g).
directions: search for phet states of matter: basics, and run the program. first click on “states”, and answer the questions below.
states
1. the program should start with solid neon. describe the spacing and motion of the particles in a solid.
sketch a diagram: solid
2. sketch a diagram of the solid state in the box to the right.
3. what happens as you cool the solid?
4. what happens as you heat the solid?
5. next, select the liquid phase. describe the spacing and motion of the particles in a liquid.
sketch a diagram: liquid
6. sketch a diagram of the liquid state in the box to the right.
7. what happens as you cool the liquid?
8. what happens as you heat the liquid?
9. next, select the gas phase. describe the spacing and motion of the particles in a gas.
sketch a diagram: gas
10. sketch a diagram of the gas state in the box to the right.
11. what happens as you cool the gas?

Question

Accepted Answer

### For Question 1 (Solid - Spacing and Motion of Particles)
# Explanation:
## Step1: Recall Solid Particle Properties
In a solid, particles (atoms/molecules) are closely packed in a regular, repeating pattern (lattice structure). Their motion is limited to vibrating in fixed positions around their equilibrium points.
## Step2: Describe Spacing and Motion
Spacing: Particles are very close together, with minimal intermolecular (or interatomic) space. Motion: Particles vibrate back - and - forth about their fixed lattice positions; they do not have translational motion (can't move freely from one place to another in the solid).
# Answer:
Spacing: Particles are closely packed with little space between them. Motion: Particles vibrate in fixed positions (no free translational movement).

### For Question 3 (Cooling a Solid)
# Explanation:
## Step1: Recall Thermal Energy and Particle Motion
Thermal energy is related to the kinetic energy of particles. When a solid is cooled, it loses thermal energy.
## Step2: Analyze Effect on Particles
As thermal energy (heat) is removed, the kinetic energy of the solid's particles decreases. This means the amplitude of their vibrational motion (the distance they move while vibrating) decreases. If cooled enough (to a lower temperature or during phase change to a more ordered state, but for cooling the solid itself), the particles become more "ordered" in their vibration and the solid may contract slightly as the spacing between particles can decrease a bit due to reduced kinetic energy pushing them apart.
# Answer:
As the solid is cooled, the particles lose thermal energy, so their vibrational motion (amplitude of vibration) decreases. The solid may contract slightly as particle spacing can reduce.

### For Question 4 (Heating a Solid)
# Explanation:
## Step1: Thermal Energy and Kinetic Energy Relationship
Heating a solid adds thermal energy to it. This increases the kinetic energy of the solid's particles.
## Step2: Effect on Particle Motion and Spacing
The increased kinetic energy makes the particles vibrate with a greater amplitude (move more vigorously in their fixed positions). If enough heat is added, the solid may expand (particle spacing increases slightly) as the more energetic particles push against each other more strongly, or it may eventually melt (change to liquid phase) when the thermal energy is enough to overcome the intermolecular forces holding the solid structure together.
# Answer:
When the solid is heated, particles gain thermal energy, so their vibrational motion (amplitude) increases. The solid may expand (particle spacing increases) or melt (if enough heat is added).

### For Question 5 (Liquid - Spacing and Motion of Particles)
# Explanation:
## Step1: Recall Liquid Particle Properties
In a liquid, particles are still relatively close together (closer than in a gas) but not in a rigid, regular lattice like a solid. The intermolecular forces are weaker than in a solid but stronger than in a gas.
## Step2: Describe Spacing and Motion
Spacing: Particles are close together, but there is more space between them than in a solid (allowing some movement). Motion: Particles can move past one another (translational motion) while still being attracted to each other. They have more freedom of movement than solid particles, sliding and flowing around each other.
# Answer:
Spacing: Particles are close but with more space than in a solid. Motion: Particles can move past each other (translational, sliding/flowing motion).

### For Question 7 (Cooling a Liquid)
# Explanation:
## Step1: Thermal Energy and Particle Motion
Cooling a liquid removes thermal energy, reducing the kinetic energy of its particles.
## Step2: Analyze Effect on Particles
As kinetic energy decreases, the particles move more slowly. The intermolecular forces become more dominant, causing the particles to come closer together and become more ordered. If cooled enough, the liquid will freeze (change to solid phase) as the particles lose enough energy to be held in a fixed, ordered lattice structure. Before freezing, the liquid may contract (particle spacing decreases) as the slower - moving particles are less able to overcome intermolecular attractions.
# Answer:
When the liquid is cooled, particles lose energy, move slower. They come closer (spacing decreases), and may freeze (form a solid) if cooled enough.

### For Question 8 (Heating a Liquid)
# Explanation:
## Step1: Thermal Energy and Kinetic Energy
Heating a liquid adds thermal energy, increasing the kinetic energy of its particles.
## Step2: Effect on Particle Motion and Spacing
The increased kinetic energy makes the particles move faster and more vigorously. They can overcome intermolecular forces more easily, so the spacing between particles increases (the liquid expands). If enough heat is added, the liquid will boil (change to gas phase) as the particles gain enough energy to break free from the liquid's intermolecular attractions and move freely as a gas.
# Answer:
When the liquid is heated, particles gain energy, move faster. Spacing increases (liquid expands), and may boil (form gas) if heated enough.

### For Question 9 (Gas - Spacing and Motion of Particles)
# Explanation:
## Step1: Recall Gas Particle Properties
In a gas, particles are far apart from each other compared to solids and liquids. The intermolecular forces between gas particles are very weak (negligible in ideal gas model).
## Step2: Describe Spacing and Motion
Spacing: Particles are widely spaced, with a large amount of empty space between them. Motion: Particles move freely and randomly in all directions (translational motion) at high speeds. They collide with each other and the walls of their container, and their motion is governed by Newton's laws of motion (in classical mechanics).
# Answer:
Spacing: Particles are widely spaced (large empty space between them). Motion: Particles move freely, randomly, and rapidly in all directions (translational motion, with collisions).

### For Question 11 (Cooling a Gas)
# Explanation:
## Step1: Thermal Energy and Kinetic Energy
Cooling a gas removes thermal energy, reducing the kinetic energy of its particles.
## Step2: Analyze Effect on Particles
As kinetic energy decreases, the particles slow down. The intermolecular forces, which were negligible before, become more significant. The particles come closer together (spacing decreases) as they move more slowly and are more likely to be attracted to each other. If cooled enough, the gas will condense (change to liquid phase) as the particles lose enough energy to be held together by intermolecular forces in a liquid - like structure. Before condensation, the gas may contract (volume decreases) as the slower - moving particles occupy less space.
# Answer:
When the gas is cooled, particles lose energy, slow down. Spacing decreases, and may condense (form liquid) if cooled enough.

### Sketching Diagrams (Questions 2, 6, 10)
For a solid diagram (Question 2):
- Draw a regular, repeating pattern of particles (e.g., circles or spheres) closely packed together in rows and columns (a lattice). Use short lines or arrows to show the particles vibrating in place (small back - and - forth motions).

For a liquid diagram (Question 6):
- Draw particles (circles) that are close together but not in a rigid lattice. Show some particles slightly displaced from others, with arrows indicating movement past one another (sliding or flowing motion).

For a gas diagram (Question 10):
- Draw particles (circles) widely spaced apart, with arrows indicating random, fast - moving trajectories (some arrows can show collisions with other particles or the "walls" of an imaginary container).

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

For Question 1 (Solid - Spacing and Motion of Particles)

Step1: Recall Solid Particle Properties

Step2: Describe Spacing and Motion

Step1: Recall Thermal Energy and Particle Motion

Step2: Analyze Effect on Particles

Step1: Thermal Energy and Kinetic Energy Relationship

Step2: Effect on Particle Motion and Spacing

Answer:

For Question 3 (Cooling a Solid)