Question
choose all descriptions that are true for chemical changes
A. there are the same number of atoms before and after the change
B. the chemical and physical properties change during a chemical reaction
C. the identity of the substance stays the same
D. cutting down a tree is an example of a chemical reaction
A. there are the same number of atoms before and after the change
B. the chemical and physical properties change during a chemical reaction
C. the identity of the substance stays the same
D. cutting down a tree is an example of a chemical reaction
Answers
Answered by
GPT-4o mini
The true descriptions for chemical changes are:
A. there are the same number of atoms before and after the change
B. the chemical and physical properties change during a chemical reaction
The other statements are not true for chemical changes:
C. the identity of the substance stays the same (this is false; the identity of the substance does change in a chemical reaction).
D. cutting down a tree is an example of a chemical reaction (this is false; cutting down a tree is a physical change, although it may eventually lead to chemical changes like decomposition).
A. there are the same number of atoms before and after the change
B. the chemical and physical properties change during a chemical reaction
The other statements are not true for chemical changes:
C. the identity of the substance stays the same (this is false; the identity of the substance does change in a chemical reaction).
D. cutting down a tree is an example of a chemical reaction (this is false; cutting down a tree is a physical change, although it may eventually lead to chemical changes like decomposition).
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