Share Chapter 13 - Lesson 2 Review Game
Save to Folder
You are working with a certain material. It looks different than when you first started working with it. Has it definitely undergone a chemical change? Yes or no? Explain.
No - various explanations
A change in the size, shape or state of matter with no new material being formed. Physical or chemical change?
physical change
How do chemical changes create new substances?
breaking chemical bonds and creating new ones
Fill in the blank: A chemical _____________________ is a specific example of one or more chemical changes.
reaction
How is it possible that water is a by-product of burning cellulose?
The cellulose contains the elements hydrogen and oxygen. H and O.
Name two forms of energy given off in a chemical change.
heat and light
How are ice and water the same if they are in two different states of matter?
They are the same chemical formula - H2O.
How are ice and water different?
The motion and arrangement of the molecules are different.
How can you extract salt from water after it has been dissolved?
Allow the water to evaporate.
Identify a slow chemical change mentioned in the book.
the rusting of iron
Identify a chemical change mentioned in the book that occurs more quickly.
baking (rusting of iron with a salt catalyst)
What is a catalyst?
something that speeds up a chemical reaction
Identify two catalysts mentioned in the book.
adding salt and heat
When matter changes, what is always conserved?
matter
Fill in the blank. Matter can neither be _______________ nor destroyed.
created
Fill in the blank. The mass of matter before a chemical change must ____________ the mass afterwards.
equal
