Paragraph: (Science-textbook/science-g5-51.txt)
Sent 1: If you build a campfire, you start with a large stack of sticks and logs.
Sent 2: As the fire burns, the stack slowly shrinks.
Sent 3: By the end of the evening, all that is left is a small pile of ashes.
Sent 4: What happened to the matter that you started with?
Sent 5: Was it destroyed by the flames?
Sent 6: It may seem that way.
Sent 7: What do you think happened?
Sent 8: The truth is that the same amount of matter still exists.
Sent 9: The wood changed not only to ashes, but also to carbon dioxide, water vapor, and other gases.
Sent 10: The gases floated off into the air, leaving behind just the ashes.
Sent 11: Although matter was changed, it was not created or destroyed.
Sent 12: Because the same amount of matter still exists, we can say that matter is conserved.
Sent 13: You may wonder how it can be conserved if something is now missing?
Sent 14: Assume you had measured the mass of the wood before you burned it.
Sent 15: Assume you had also trapped the gases released by the burning wood and measured their mass and the mass of the ashes.
Sent 16: What would you find?
Sent 17: The ashes and gases combined have the same mass as the wood you started with.
Sent 18: This example illustrates the law of conservation of mass.

Question: What happened to the matter changed to when burning a fire? (true/0)

The wood changed to carbon dioxide, water vapor, and other gases that floated off into the air, leaving behind just the ashes
It changed to other gases
It changed to ashes
It changed to Carbon dioxide
It changed to water vapor
It was destroyed
More matter was created
All the matter changes to fire

Question: Is any matter destroyed when you burn wood in a campfire? (true/1)

Question: After you burn wood in your campfire, the wood matter ends up on the ground (mostly as ashes), but where does the rest of the matter go? (true/2)

It changes into air and heat
It is destroyed in the air
It travels through the air
It changed changes into carbon dioxide, water vapor and other gases
Into the air (as carbon dioxide, water vapor, and other gases)

Question: How is matter conserved after wood burns? (true/3)

Assume you had also trapped the gases released by the burning wood and measured their mass and the mass of the ashes; the ashes and gases combined have the same mass as the wood you started with
The ashes and gases have the same composition
The ashes and gases combined have the same original mass
New matter is created to replace the destroyed matter
The matter takes on different forms

Question: What can cause wood to change to ashes, carbon dioxide, water vapor, and other gases? (true/4)

Question: Is any matter created when you burn wood in a campfire? (true/5)

Question: Ashes and gases in an example of what? (false/6)

Question: The fact that ashes and gases combined have the same mass as the wood you started with illustrates what law? (true/7)

Law of energy transfer
The law of conservation of mass
Law of equal and opposite reaction

Question: What happens to sticks and logs in a campfire? (true/8)

They change into pile of ashes
They are permanently eliminated from the earth
As the fire burns, the stack slowly shrinks and a while later, all that is left is a small pile of ashes
They get converted to fire and heat
They are converted to ashes and gases

Question: As a fire burns, what stack slowly shrinks? (true/9)

The stack of sticks and logs
The ashes
Stack of ashes
The stack of sticks

Question: Once a stack of sticks and logs is burnt what matter remains? (false/10)

The wood changed not only to ashes, but also to carbon dioxide, water vapor, and other gases
Small pile of ashes
Only the ashes,All other matter was destroyed
Only the ashes, all other matter changed forms and moved away from the fire
Big pile of ashes
Ashes

Question: What happened to the wood? (true/11)

It was converted to ashes
The wood changed not only to ashes, but also to carbon dioxide, water vapor, and other gases, which floated off into the air, leaving behind just the ashes
They get converted to ashes entirely
They get converted to water vapor, carbon dioxide and other gases
It was completely destroyed

Question: What is left when the stack shrinks? (true/12)