Help with Chemistry&Physics report :p

Which of the following does NOT involve physical change? a. decomposing b. mixing c. grinding d. melting

Please answer if you can or give me a website; thanks. :) How is quantum mechanics different from previous models?

What is an ionic equation and what is a net ionic equation?

Neon , Beryllium , sodium , boron arrange the elements increasing order of their atom size. I know this is a lot but I reall...

I have a report to do for chem.&physics and we have to write it in a newspaper format. My "task" is below but I'm confused on...

In my report I have to Explain the Quantum Mechanical Model. I know how to explain Quantum Mechanics, but not the model. And ...

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How Much Of An 18% Solution Of Sulfuric Acid Should Be Added To 360 Ml Of A 10% Solution To Obtain A 15% Solution? A) 60 Ml...

So..in chemistry I have to do a 3 pg report on any element I picked helium..(I don't know y) but I dont know how to start off...

I have a chemistry test tomorrow, and I found this question tthat I cant solve. anyone help me? this is the question: they to...