Which observation most likely indicates that only a chemical change has taken place?(1 point)

Question

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.

Answer 1

A reaction occurs.

Answer 2

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

Answer 3

2 and 4

Answer 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.

Answer 5

Only a phase change occurs.

Answer 6

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

Answer 7

Burning wood