Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
The change cannot be reversed.
The change cannot be reversed.
A reaction occurs.
A reaction occurs.
The shape changes.
The shape changes.
States of matter changes.
A reaction occurs.
Use the table of observed changes to answer the question.
Change # Reacts with another substance? Temperature change? Gas, sound, or light produced? New substance formed?
1 yes yes yes yes
2 no yes yes no
3 yes yes yes yes
4 no no no no
Which changes shown in the table are physical changes?
(1 point)
Responses
2 and 3
2 and 3
2 and 4
2 and 4
1 and 4
1 and 4
1 and 2
2 and 4
Why is it a physical change to freeze water?(1 point)
Responses
A temperature change occurs.
A temperature change occurs.
Heat is released during the process.
Heat is released during the process.
Only a phase change occurs.
Only a phase change occurs.
The new and original substances are different.
The new and original substances are different.
Only a phase change occurs.
Which option is an example of a chemical change?(1 point)
Responses
folding paper
folding paper
stretching a rubber band
stretching a rubber band
burning wood
burning wood
chopping vegetables