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Chemistry : Recent Questions and Answers (Page 4)

Find answers to your questions about Chemistry or help others by answering their Chemistry questions.

Hydrates and melting points

Basalt melting point: wet vs dry I had a student ask me this in class the other day; I thought about it, but I still can't work...

Asked on 12/10/2021 by Jesuspowder

1 answer

Why am I getting higher conversion values of isopropanol dehydration over a zeolite catalyst than n-propanol dehydration?

The two process are run separetly but under the same condition, same activation of the catalyst, same reaction temperature, same flow.The initial conversion of n-propanol is ~50% and isopropanol...

Asked on 12/10/2021 by marietiara

2 answer

What is the proper way to prepare a solution from hydrate?

I am following a protocol that requires me to prepare $10~ mathrm{mL}$ $mathrm{1~M}~ ce{Ca(NO3)2}$. However, there is only $ce{Ca(NO3)2*4H2O}$ in the lab. Originally I thought that all I have...

Asked on 12/07/2021 by wswr

1 answer

Why is the electrode potential for a cathode positive?

Electrode potential is the potential difference between the electrode and the surrounding electrolyte. If the potential of the cathode is positive this means that the potential of the electrode is...

Asked on 12/07/2021

3 answer

Is benzocyclobutadiene aromatic or anti-aromatic?

My teacher told that benzocyclobutadiene is both aromatic and anti-aromatic. I do not understand why. Can anyone explain? ...

Asked on 12/07/2021 by Master Maxx

1 answer

Sign of change in enthalpy and change in entropy

Why is it wrong to assert that the change in entropy and the change in enthalpy must always have the same sign? What makes me think that they must have...

Asked on 12/06/2021

1 answer

What grade of sodium fluoride is needed for preservation of urine for drug and alcohol testing?

We are preparing DUI test kits and the distributor we purchased our sodium fluoride vials from is no longer in service. We are having difficulty finding a new supplier....

Asked on 12/04/2021 by Errin J

1 answer

Plasticisers and other impurities from polyethylene laboratory bottles?

Does polyethylene (PE), widely used for wash/squirt bottles in labs, contain soluble compounds such as plasticizers that can accumulate in organic...

Asked on 12/02/2021

1 answer

Calculating the amount of oxygen in a glass using candle burning time

I would like to calculate the amount of oxygen or concentration of oxygen in a glass or conical flask using candle burning time. I am thinking of a simple way...

Asked on 11/30/2021 by Fawaz Ahmed

2 answer

How to make Lithium medication from scratch

I take lithium carbonate as a medication. I was watching an "apocalypse-style" movie recently, which made me wonder how hard it would be to make my medication from scratch if...

Asked on 11/28/2021 by SmallCuteDogs

0 answer

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