1. Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
States of matter changes.
States of matter changes.
The change cannot be reversed.
The change cannot be reversed.
A reaction occurs.
A reaction occurs.
The shape changes.
2. Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
States of matter changes.
States of matter changes.
The change cannot be reversed.
The change cannot be reversed.
A reaction occurs.
A reaction occurs.
The shape changes.
3. Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
States of matter changes.
States of matter changes.
The change cannot be reversed.
The change cannot be reversed.
A reaction occurs.
A reaction occurs.
The shape changes.
4. Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
States of matter changes.
States of matter changes.
The change cannot be reversed.
The change cannot be reversed.
A reaction occurs.
A reaction occurs.
The shape changes.
1. A reaction occurs.
2. The change cannot be reversed.
3. States of matter changes.
4. The change cannot be reversed.
Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
States of matter changes.
States of matter changes.
The change cannot be reversed.
The change cannot be reversed.
A reaction occurs.
A reaction occurs.
The shape changes.
The most likely observation indicating that only a chemical change has taken place is "A reaction occurs."
1 and 4
2 and 3
1 and 2
or 2 and 4.
The correct answer is 2 and 4.
Why is it a physical change to freeze water?(1 point)
Responses
Heat is released during the process.
Heat is released during the process.
Only a phase change occurs.
Only a phase change occurs.
A temperature change occurs.
A temperature change occurs.
The new and original substances are different.