Color change Chemical reaction help

AI Thread Summary
For a project requiring a color change through a chemical reaction using two powders, turmeric and methylene blue are recommended. When mixed, turmeric's yellow color combines with methylene blue's hue to create green, providing a visually interesting result. Both chemicals are non-toxic and relatively inexpensive, making them suitable for the project. The reaction does not require heat, aligning with the project’s requirements. This combination offers an effective solution for demonstrating a color change in a safe manner.
jonathancohen
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I am working on a project that needs 2 chemicals to react and change colors. The catch is they most likely need to be or come in a powder form, non toxic, and relatively inexpensive.

PLEASE HELP!
 
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To clarify: you want to mix two powders and observe color change?
 
yes, that is correct
 
...without heat
 
Try tumeric and methylene blue. Mix the yellow powder with the blue one and it turns green! How cool is that?
 
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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