Physical vs. Chemical Change Quick Check
Science 8 Q1 / Matter Interactions
Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
The shape changes.
The change cannot be reversed.
A reaction occurs.
States of matter changes.
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
1 and 4
1 and 2
2 and 3
2 and 4
Why is it a physical change to freeze water?(1 point)
Responses
The new and original substances are different.
Only a phase change occurs.
A temperature change occurs.
Heat is released during the process.
Which option is an example of a chemical change?(1 point)
Responses
folding paper
stretching a rubber band
burning wood
chopping vegetables
tell me what the answers are for each question
Sorry, but your answers are wrong.....
Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
2 is D and the bot is rite
The observation that most likely indicates that only a chemical change has taken place is: A reaction occurs.
The physical changes shown in the table are: 1 and 4.
The reason why freezing water is a physical change is: Only a phase change occurs.
An example of a chemical change is: burning wood.
2 is 2 and 4
Observation that most likely indicates a chemical change has taken place: A reaction occurs.
To determine the physical changes shown in the table:
- Change #1 reacts with another substance, experiences a temperature change, releases gas, sound, or light, and forms a new substance.
- Change #2 does not react with another substance, experiences a temperature change, releases gas, sound, or light, but does not form a new substance.
- Change #3 reacts with another substance, experiences a temperature change, releases gas, sound, or light, and forms a new substance.
- Change #4 does not react with another substance, does not experience a temperature change, does not release gas, sound, or light, and does not form a new substance.
Therefore, the physical changes shown in the table are changes #1 and #4.
Reason why freezing water is a physical change: Only a phase change occurs.
Example of a chemical change: Burning wood.
1. A reaction occurs.
2. Changes 1 and 4 are physical changes.
3. Only a phase change occurs.
4. Burning wood is an example of a chemical change.