Identifying Chemical vs Physical Changes

AI Thread Summary
To identify a chemical change versus a physical change, one must observe specific indicators. A chemical change is often indicated by a change in color, temperature, or the production of gas, while a physical change typically involves alterations in appearance without changing the substance's chemical composition. The discussion highlights confusion regarding these definitions and suggests consulting educational resources for clarification. Understanding these differences is crucial for accurately categorizing changes in matter. Clear examples and definitions can aid in distinguishing between the two types of changes.
Maroc
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Homework Statement


How would you know wheather its a chemical change or physical change


Homework Equations





The Attempt at a Solution

 
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What does your book say about?
 
just says something about the physical apperance as for chemical a change in the gas happens...i don't get it
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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