Unit C Review
Completion requirements
Unit C Review
Review
On the next page, you will take a 35-question unit test. Are you confident you know the Unit C material well?
It's always a good idea to make sure you are prepared for a test by studying. You can do this by returning to the
Table of Contents and reviewing any Unit C lessons you are not sure about.
Also, you can review unit C material by trying three review exercises.
- Create a mind map of the unit material. A mind map is a visual representation of how all the ideas and concepts of the unit connect with each other. Try building a mind map by clicking the first tab below.
- Do a puzzle! A puzzle can be a fun way to review unit concepts or terms. Try the puzzle we have prepared for you by clicking the second tab below.
- Practice answering some questions. We have prepared some questions that will really get you thinking about the unit material. Try the practice questions by clicking the third tab below.
Remember, these are just suggestions for review! In addition to doing these three review exercises, you might also:
- Contact your teacher for assistance if you are not sure about any concepts.
- Check the course glossary and read all the unit C terms.
- Make your own study cards and test yourself.
Whatever you choose to do, good luck with your unit review!
Create a Mind Map
A mind map is a visual representation of how all the ideas
and concepts of the unit connect with each other. There are several
ways you can create a mind map:
- You can create a mind map simply with just a pen and a sheet of paper.
- You might try to build one using a free drawing program such as gimp.
- You can use a web-based free mind map generator such as mindmup. Mindmup is pretty easy to figure out just by playing with it, but click here if you want to view a short tutorial.
Unit C Example Mind Map
Do a Puzzle!
A puzzle can be a fun way to review unit concepts or
terms. We have prepared a Unit A review puzzle for you:
- You can print out the puzzle and try doing it with a pen or pencil. Click here to download the puzzle.
- After you have done the puzzle, you probably should check your answers. Click here to download the puzzle with answers.
Try Some Practice Questions
The following 5 questions are meant to get you thinking
about the Unit C material. Answers are provided below each question, but
before you look at the answer, you should really try hard at answering
the question yourself. If you have to, review the Unit C lessons.
Question 1
1 mark
Some types of dental cavity fillings are made with a mixture of metals, especially mercury and silver. A man with a mercury dental filling drinks a hot cup of tea. Afterwards, his tooth with the dental filling hurts. What is the best explanation for this observation? Refer to the particle theory of matter in your answer.
1 mark
Some types of dental cavity fillings are made with a mixture of metals, especially mercury and silver. A man with a mercury dental filling drinks a hot cup of tea. Afterwards, his tooth with the dental filling hurts. What is the best explanation for this observation? Refer to the particle theory of matter in your answer.
1 mark total
Heat energy transfers from the hot tea to the metal dental filling. Heat energy causes the particles in the metal to move faster and spread apart, causing thermal expansion of the mercury. The expanded filling presses on the surrounding tooth, which causes pain.
Heat energy transfers from the hot tea to the metal dental filling. Heat energy causes the particles in the metal to move faster and spread apart, causing thermal expansion of the mercury. The expanded filling presses on the surrounding tooth, which causes pain.
Question 2
6 marks
You put a pot of cold water on a stove burner and turn on the burner. The water in the pot warms gradually. After several minutes, the liquid starts to boil into steam.
6 marks
You put a pot of cold water on a stove burner and turn on the burner. The water in the pot warms gradually. After several minutes, the liquid starts to boil into steam.
a. Describe what is happening to the particles of water as the water is heated and changed into steam.
b. List the two processes of heat transfer that occur in this situation. Describe what is happening to the particles in each type of heat transfer.
6 marks total
Part A: 2 marks. 1 mark for description of liquid water, 1 mark for description of gaseous water
Part B: 4 marks. 1 mark for listed method of heat transfer, 1 mark for description
As the particles of liquid water are heated, they begin to move further apart. When the water boils, the particles have enough energy to make them move very fast and far apart in gas form.
Heat transfers from the hot stove burner to the pot and from the pot to the water by conduction. The fast moving particles of the stove burner bump into slower moving particles of the metal pot. This transfers heat energy from the stove burner particles to the metal pot particles. In the same way, heat conducts from the metal pot particles to the water particles.
Heat transfers throughout the water in the pot by convection. The water near the burner becomes hotter, which causes its particles to move further apart. This makes the hot water less dense, and it rises to the top of the pot.
Part A: 2 marks. 1 mark for description of liquid water, 1 mark for description of gaseous water
Part B: 4 marks. 1 mark for listed method of heat transfer, 1 mark for description
As the particles of liquid water are heated, they begin to move further apart. When the water boils, the particles have enough energy to make them move very fast and far apart in gas form.
Heat transfers from the hot stove burner to the pot and from the pot to the water by conduction. The fast moving particles of the stove burner bump into slower moving particles of the metal pot. This transfers heat energy from the stove burner particles to the metal pot particles. In the same way, heat conducts from the metal pot particles to the water particles.
Heat transfers throughout the water in the pot by convection. The water near the burner becomes hotter, which causes its particles to move further apart. This makes the hot water less dense, and it rises to the top of the pot.
Question 3
6 marks
Popcorn can be made in three ways.
You can make popcorn in a pot on a stove burner.
You can make popcorn with a hot air popping machine.
You can make popcorn in the microwave.
Each method of making popcorn uses a different type of heat transfer. In each popcorn-making situation, state the type of heat transfer used, and explain how heat is transferred to the popcorn.
6 marks
Popcorn can be made in three ways.
You can make popcorn in a pot on a stove burner.
You can make popcorn with a hot air popping machine.
You can make popcorn in the microwave.
Each method of making popcorn uses a different type of heat transfer. In each popcorn-making situation, state the type of heat transfer used, and explain how heat is transferred to the popcorn.
6 marks total.
1 mark for matching heat transfer process correctly, 1 mark for explanation.
Heat is transferred to popcorn on a stove burner by conduction. The stove burner conducts heat to the metal pot. The metal pot then conducts heat to the popcorn kernels in the bottom of the pot.
Heat is transferred to popcorn in a hot air popper by convection. The popping machine has an air heating element. Heated air becomes less dense and rises through the popping machine. Hot air surrounds and heats the popcorn kernels.
Heat is transferred to popcorn in a microwave by radiation. Radiant energy from a microwave is absorbed by popcorn kernels.
1 mark for matching heat transfer process correctly, 1 mark for explanation.
Heat is transferred to popcorn on a stove burner by conduction. The stove burner conducts heat to the metal pot. The metal pot then conducts heat to the popcorn kernels in the bottom of the pot.
Heat is transferred to popcorn in a hot air popper by convection. The popping machine has an air heating element. Heated air becomes less dense and rises through the popping machine. Hot air surrounds and heats the popcorn kernels.
Heat is transferred to popcorn in a microwave by radiation. Radiant energy from a microwave is absorbed by popcorn kernels.
Question 4
4 marks
People want to maintain comfortable temperatures in their homes, both in the summer and in the winter. List and explain two ways that heat transfer can be controlled in houses all year round.
4 marks
People want to maintain comfortable temperatures in their homes, both in the summer and in the winter. List and explain two ways that heat transfer can be controlled in houses all year round.
4 marks total
1 mark per listed item, 1 mark per explanation.
There are several different ways to answer this question because there are many ways to control heat transfer in homes. If your answers are similar to the following samples, you should consider yourself correct.
Sample answers:
1 mark per listed item, 1 mark per explanation.
There are several different ways to answer this question because there are many ways to control heat transfer in homes. If your answers are similar to the following samples, you should consider yourself correct.
Sample answers:
- Insulation with a high R-value in the walls of a house prevents heat transfer out of a house during the winter and into a house during the summer.
- A thermostat maintains a steady temperature in a house. It turns the furnace on and off only when necessary.
- Double pane windows contain insulating air between the glass panes. This insulating air prevents heat transfer in and out of a house.
Question 5
1 mark
A Grade 8 student tells you, “You find temperature by adding up the total amount of energy in an object.”
What is incorrect about this statement and why?
1 mark
A Grade 8 student tells you, “You find temperature by adding up the total amount of energy in an object.”
What is incorrect about this statement and why?
1 mark total
Temperature is not the total amount of energy in an object. Temperature measures the average amount of kinetic energy of the particles in an object.
The total amount of kinetic energy of particles in an object is called thermal energy.
Temperature is not the total amount of energy in an object. Temperature measures the average amount of kinetic energy of the particles in an object.
The total amount of kinetic energy of particles in an object is called thermal energy.