Question

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

States of matter changes.
States of matter changes.

A reaction occurs.
A reaction occurs.

The change cannot be reversed.
The change cannot be reversed.

The shape changes.

Answer 1

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 4
2 and 4

1 and 2
1 and 2

1 and 4
1 and 4

2 and 3

Answer 2

Why is it a physical change to freeze water?(1 point)
Responses

Only a phase change occurs.
Only a phase change occurs.

A temperature change occurs.
A temperature change occurs.

Heat is released during the process.
Heat is released during the process.

The new and original substances are different.

Answer 3

Question
Which option is an example of a chemical change?(1 point)
Responses

stretching a rubber band
stretching a rubber band

folding paper
folding paper

chopping vegetables
chopping vegetables

burning wood

Answer 4

The change cannot be reversed.

Answer 5

2 and 4 are physical changes.

Answer 6

Only a phase change occurs

Answer 7

Burning wood