1. When the wood burns it can’t be changed back to wood.
2-PS1-4
2nd Grade
Post Test
Can Changes be Reversed?
Post-Test Directions
Pass out “Student Sheet” to students. If necessary, read questions and possible answers.
1. Which of these choices is an example of a chemical change?
O an ice cube melting
a log burning
O water boiling
O shaping clay into an object
Why did you choose the answer(s) you did on number 1?
Read number 3 to students, tell them to remember the egg experiment and to carefully remember
what makes a chemical or physical change.
3. What did you notice about the changes that the egg went through?
O They were a chemical change, since they could NOT be undone.
O They were a physical change, since they could be undone.
O They were a physical change, since they could NOT be undone.
O They were a chemical change, since they could be undone.
Remind students of the introduction to the Can Changes be Reversed lesson
(marshmallow)
When we burned the marshmallow we made a chemical change
to the marshmallow.
O TRUE
O FALSE
5. Write an example of a physical change?
When the wood burns it can’t be changed back to wood.
Freezing water into ice is a physical change because it can
be undone and changed back to water.

2. Student Sheet Name____________________________ Post Test 2-PS1-4
Carefully read or listen to the questions. Be sure you read and think about all choices before
picking one.
1. Which of these choices is an example of a chemical change?
O an ice cube melting
O a log burning
O water boiling
O shaping clay into an object
Why did you choose the answer(s) you did on number 1?
Read number 3 to students, tell them to remember the egg experiment and to carefully remember
what makes a chemical or physical change.
3. What did you notice about the changes that the egg went through?
O They were a chemical change, since they could NOT be undone.
O They were a physical change, since they could be undone.
O They were a physical change, since they could NOT be undone.
O They were a chemical change, since they could be undone.
Remind students of the introduction to the “Can Changes be Reversed” lesson
(marshmallow)
When we burned the marshmallow we made a chemical change
to the marshmallow.
O TRUE
O FALSE
5. Write an example of a physical change?

3. Show what you know! Chemical Changes vs. Physical Changes
2-PS1-4
Chemical Changes vs. Physical Changes
Show what you know!
1. Which of these choices is an example of a chemical change?
O an ice cube melting
O a log burning
O water boiling
O shaping clay into an object
Remember….a chemical change cannot be undone or
returned to its earlier state.
A whole new material or product is made.

4. Show what you know! Chemical Changes vs. Physical Changes
2-PS1-4
Chemical Changes vs. Physical Changes
Show what you know!
What new “product” or thing was created when the wood from the log burned?
Can it ever be made back into wood?
Why not?

5. Show what you know! Chemical Changes vs. Physical Changes
2-PS1-4
Chemical Changes vs. Physical Changes
Show what you know!
3. What did you notice about the changes that the egg went through as it was poached?
O They were a chemical change, since they could NOT be undone.
O They were a physical change, since they could be undone.
O They were a physical change, since they could NOT be undone.
O They were a chemical change, since they could be undone.
The raw egg changed into a cooked egg and can never
be returned to a raw egg!

6. Show what you know! Chemical Changes vs. Physical Changes 2-PS1-4
When we burned the marshmallow we made a chemical change to the marshmallow since we could never change the burned part back to a new marshmallow.
O TRUE
O FALSE

7. Show what you know! Chemical Changes vs. Physical Changes
2-PS1-4
Chemical Changes vs. Physical Changes
Show what you know!
Let’s think of an example of a PHYSICAL change.
Remember, the change CAN be reversed…it can be changed back.
It only changes the properties of the object – size, shape, texture, so on
It is still the same material that is started off as!

8. Chemical Changes vs. Physical Changes
2-PS1-4
Chemical Changes vs. Physical Changes
Thank you and see you next time!