2.
This part of your homework will check your understanding of the module.
3.
Look at Figure 2.2.4 on pg 54. What do you think this diagram tells you about solids.
4.
Look at Figure 2.2.5 on pg 54. What do you think this diagram tells you about liquids?
5.
In this part of the homework you are required to write full sentence answers to the questions.
6.
For each of the pictures shown below state if it represents a solid, liquid or gas. Also give an explanation for your choice.
7.
Look at Figure 2.2.6 on pg 55. What do you think this diagram tells you about gases?
8.
Your Science text book contains a lot of detailed information. If you try to absorb all of the information in one go you can easily get lost or confused. We recommend that you skim the text first. One way to do this is to look at the pictures and diagrams before reading the chapter in detail. This gives you some clues about what the information text contains. You then look at the detail later.
9.
This part of your homework is designed to help you remember the essential science terminology from this chapter.
10.
Which of the following ideas are used in the particle model?
Correct Answer(s)
A. All substances are made up of tiny, hard particles that are too small to see.
A. The particles of substances always have energy and are moving (even if it is a very small amount).
A. The particles of substances move about more and move faster as temperature is increased
A. The closer the particles are to one another, the stronger the attraction between them.
Explanation
The correct answer choices for this question are: "All substances are made up of tiny, hard particles that are too small to see," "The particles of substances always have energy and are moving (even if it is a very small amount)," "The particles of substances move about more and move faster as temperature is increased," and "The closer the particles are to one another, the stronger the attraction between them." These ideas are used in the particle model to explain the behavior and properties of substances. The model assumes that all substances are composed of tiny, hard particles that are too small to see, and that these particles are constantly in motion, even if the motion is very small. Additionally, the model explains that as temperature is increased, the particles move about more and faster, and that the closer the particles are to each other, the stronger the attraction between them.
11.
The particles in a solid have energy and ________ about as shown in Figure 2.2.4. The particles don't break out of position but just ________ about on the spot.
Correct Answer(s)
jiggle, vibrate
vibrate, jiggle
Explanation
The particles in a solid have energy and jiggle about as shown in Figure 2.2.4. The particles don't break out of position but just vibrate on the spot.
12.
If you increase the temperature, this gives the particles more ________ and so they ________ more.
Correct Answer(s)
energy
vibrate, jiggle
Explanation
Increasing the temperature of a substance provides the particles with more energy. As a result, the particles vibrate and jiggle more vigorously. This increased movement is due to the higher energy levels, causing the particles to move more rapidly and chaotically.
13.
Explaining solids
The particles in solids are closely packed in ________ positions. Forces between neighbouring particles form bonds that ________ all the particles in the solid closely together.
Correct Answer(s)
fixed
hold
Explanation
The particles in solids are closely packed in fixed positions. Forces between neighboring particles form bonds that hold all the particles in the solid closely together.
14.
Explaining liquids
In a liquid, the particles are still packed closely together but they are far more ________ ________ (joined) to their neighbours than the particles are in a solid. The loose bonding allows the particles to ________ about and over each other, allowing the liquid to ________, drip and fill the bottom of whatever ________ it is in.
Correct Answer(s)
loosely
bonded
move
flow
container
Explanation
In a liquid, the particles are still packed closely together but they are far more loosely bonded to their neighbors than the particles are in a solid. This loose bonding allows the particles to move about and over each other, allowing the liquid to flow, drip, and fill the bottom of whatever container it is in.
15.
If a particle has lots of ________, then it will move about a lot. If the particle has very little energy, then it will move about only a ________ bit.
Correct Answer(s)
energy
little, tiny
Explanation
If a particle has lots of energy, it will have a high level of kinetic energy, allowing it to move about a lot. On the other hand, if the particle has very little energy, it will have a low level of kinetic energy, causing it to move about only a tiny bit.
16.
You add energy to matter whenever you ________ it, as heat is a type of ________.
Correct Answer(s)
heat
energy
Explanation
When you add heat to matter, you are actually adding energy to it. Heat is a form of energy transfer, where energy is transferred from a hotter object to a cooler object. So, by adding heat to matter, you are increasing its energy content.
17.
As the liquid is ________, this movement gets ________.
Correct Answer(s)
heated
faster, greater, more
Explanation
When the liquid is heated, its molecules gain energy and move faster. This increase in molecular motion leads to a greater movement of the liquid as a whole. Therefore, the correct answer is "heated, faster, greater, more."
18.
Explaining gases
The particles of gases are spread far ________ and have ________ holding their particles together.
Correct Answer(s)
apart
nothing
Explanation
Gases have particles that are spread far apart from each other and have nothing holding their particles together. This is because gases have weak intermolecular forces and high kinetic energy, allowing the particles to move freely and independently. Unlike solids and liquids, gases do not have a definite shape or volume and can easily expand and fill the space available to them.
19.
This lack of bond between particles allows them to move ________ and in straight lines until they ________ something. The particles could hit other gas ________ or the ________ of the container they are in.
Correct Answer(s)
fast, faster
hit
particles, molecules, atoms
walls, sides
Explanation
Particles in a gas lack strong bonds with each other, which allows them to move rapidly and in straight lines until they collide with something. These particles, which can be molecules or atoms, may hit other gas particles or the walls/sides of the container they are in.
20.
The Particle Model (Page 53)
In the particle model, all substances are thought to be made of incredibly small, hard ________ called particles. Each ball has energy and ________ according to how much ________ it has.
Correct Answer(s)
balls
moves
energy
Explanation
In the particle model, all substances are thought to be made of incredibly small, hard balls called particles. Each ball has energy and moves according to how much energy it has.
21.
The more you ________ a substance, the more energy the particles get and the ________ they move. If you ________ a substance, then the reverse happens: the particles move about ________ and move more slowly.
Correct Answer(s)
heat
faster
cool
less
Explanation
When you heat a substance, the particles gain more energy and move faster. This is because heat increases the kinetic energy of particles, causing them to move more rapidly. On the other hand, when you cool a substance, the reverse happens. The particles lose energy and move about less, resulting in slower movement.
22.
The particle model uses the following ideas:
- All substances are made up of tiny ________ that are too small to see even with a normal microscope.
- Even if it is a very small amount, the particles always have energy and are ________.
- The particles move about more and move faster as ________ is increased.
- The closer the particles are to one another, the stronger the ________ between them.
Correct Answer(s)
particles
moving
temperature
attraction
Explanation
The particle model is based on the idea that all substances are made up of tiny particles that are too small to see, even with a normal microscope. These particles are always in motion and have energy, regardless of the amount. The speed and movement of the particles increase as the temperature is increased. Additionally, the closer the particles are to each other, the stronger the attraction between them.
23.
Which of the following statements about solids are correct?
Correct Answer(s)
A. The particles in solids are closely packed together in fixed positions.
A. The particles in solids have energy and vibrate on the spot.
A. If you increase the temperature of a solid, the particles will vibrate more.
A. Solids have a fixed shape and do not flow because they're particles are strongly bonded to their neighbours.
A. Solids our incompressible because their particles are packed closely together
A. Heating causes a solid to expand because the particles vibrate faster making them spread further apart.
Explanation
Solids are characterized by closely packed particles that are fixed in position. These particles have energy and vibrate in place. When the temperature of a solid is increased, the particles vibrate more vigorously. Solids have a fixed shape because their particles are strongly bonded to their neighbors, and they do not flow. Solids are incompressible because their particles are packed closely together. Heating a solid causes the particles to vibrate faster, leading to an expansion as they spread further apart.
24.
Which of the statements about liquids are correct?
Correct Answer(s)
A. In liquids, the particles are still packed closely together but they are far more loosely bonded to their neighbours.
A. The loose bonding of particles in a liquid allows them to move about and over each other.
A. As a liquid is heated, the movement of its particles increases.
A. Liquids flow to take up the shape of the bottom of the container there in because the bonds between particles are loose enough to allow the particles to slip over one another.
A. Liquids are incompressible because their particles are packed closely together.
A. Liquids expand when heated because the particles move over each other faster, making them spread further apart.
Explanation
Liquids have particles that are still packed closely together, but they are more loosely bonded to their neighbors. This loose bonding allows the particles to move about and over each other, which is why liquids flow and take up the shape of the container. As a liquid is heated, the movement of its particles increases, causing them to spread further apart and making the liquid expand. Liquids are incompressible because their particles are packed closely together, meaning they cannot be easily compressed.
25.
Which statements about gases are correct?
Correct Answer(s)
A. The particles in a gas spread far apart and have nothing holding them together.
A. The particles in a gas move fast and in straight lines until they hit something.
A. Gas particles hitting the walls of the container cause pressure on the walls of the container.
A. Gas particles are spread so far apart that you cannot see the gas. Gases are often said to be invisible.
A. Gas particles are spread so far apart that there is plenty of vacant space between them. This allows them to be compressible.
A. Because there are no bonds between gas particles they travel in all directions until they fill the container that they are in.
A. Heating causes gas particles to move faster making the move further apart. This causes gases to expand when heated.
Explanation
Gases are composed of particles that are spread far apart and have no bonds holding them together. These particles move rapidly in straight lines until they collide with something, causing pressure on the walls of the container. The particles in a gas are so spread out that they cannot be seen, making gases appear invisible. Gases are compressible because there is plenty of vacant space between the particles. Without any bonds between them, gas particles travel in all directions until they fill the container. Heating a gas causes the particles to move faster and further apart, resulting in expansion.