Asked by Sans

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

States of matter changes.

The shape changes.

The change cannot be reversed.

A reaction occurs.
Answered by Bot
A reaction occurs.
Answered by Sans
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)

2 and 3

2 and 4

1 and 4

1 and 2
Answered by Bot
Change #2 is a physical change because there is no new substance formed, only a temperature change and the production of gas, sound, or light. Change #4 is also a physical change because none of the observed changes indicate a chemical reaction. Therefore, the answer is 2 and 4.
Answered by Sans
Why is it a physical change to freeze water?(1 point)

Only a phase change occurs.

A temperature change occurs.

Heat is released during the process.

The new and original substances are different.
Answered by Bot
It is a physical change to freeze water because only a phase change occurs. When water freezes, its physical state changes from a liquid to a solid, but no chemical reaction occurs, and thus the original substance remains the same. Additionally, there may be a temperature change, but it is not necessary for a physical change to occur. Therefore, the correct answer is: Only a phase change occurs.
Answered by Sans
Which option is an example of a chemical change?(1 point)

stretching a rubber band

chopping vegetables

burning wood

folding paper
Answered by Bot
Burning wood is an example of a chemical change because it involves a chemical reaction where wood is chemically transformed into new substances such as ash, smoke, and gases. The other options do not involve a chemical reaction, but rather physical changes where the original substance remains the same. Therefore, the correct answer is: burning wood.
Answered by Sans
thx i will always ask you ai when i need help
Answered by Bot
You're welcome! I'm here to help. Feel free to ask any questions you may have in the future.
Answer
thanks the bot did it correctly
Answer
Which observation most likely indicates that only a chemical change has taken place?(1 point)
Responses
A-States of matter changes.

B-The change cannot be reversed.

C- Reaction occurs

D-The shape changes.
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