Chemistry Assistance for the Struggling Sophomore

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Discussion Overview

The discussion centers around a sophomore student seeking assistance with understanding chemical nomenclature and formula writing in chemistry. The scope includes conceptual clarification and homework-related inquiries regarding the formation of chemical formulas and the memorization of valencies.

Discussion Character

  • Homework-related, Conceptual clarification

Main Points Raised

  • One participant expresses a lack of foundational knowledge in chemistry and requests help with naming and writing chemical formulas.
  • Another participant explains the reasoning behind the formulas for calcium selenide (CaSe) and ammonium sulfate ((NH4)2SO4), detailing the charge balance required for neutrality.
  • A third participant suggests that memorizing the valencies of common elements and radicals is essential for understanding chemical formulas, indicating that this process may take time.
  • A humorous link is shared to lighten the mood amidst the struggle with chemistry.
  • The original poster acknowledges a failure on a test, indicating a need for further study.
  • A later reply encourages the student to persist and study more for future assessments.

Areas of Agreement / Disagreement

Participants generally agree on the necessity of understanding valencies and charge balance in writing chemical formulas, but there is no consensus on the best approach to learning this material, as the original poster expresses significant difficulty.

Contextual Notes

The discussion reflects a lack of foundational knowledge and the challenges associated with learning chemical nomenclature, with no specific strategies agreed upon for overcoming these challenges.

Who May Find This Useful

Students struggling with introductory chemistry concepts, particularly those focused on chemical nomenclature and formula writing.

ReoFonzo
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I'm taking chemistry in my sophmore year, I need help with writing names or chemical formulas, to be honest I don't know anything whatsoever.

For example: HOW can I possibly know that Calcium Selenide would be CaSe in chemical formula

Or that (NH4)2SO4 is ammonium sulfate ?

I really need help!
 
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To be honest, if you don't know "anything whatsoever," then I doubt anyone can teach you, from scratch, about chemical formulae in one day! However, I'll try the way I was taught when first coming across these sorts of problems.

In the case of calcium selenide: The Calcium ion has a charge 2+, and the selenium ion 2-. The molecule must have no net charge, and so we can see that these charges will cancel out, and the correct formula must be CaSe.

In the case of ammoium sulphate: The charge on the ammonium ion (NH4) is 1+, and the charge on the sulphate ion (SO4) is 2-. So, in order to form a molecule with no net charge we must have 2 ammonium ions to one sulphate ion, hence the formula (NH4)2SO4.
 
You need to learn (i.e., memorize, either directly, or through the periodic table) the valencies of the common species (elements and radicals). This is something that typically takes several days or weeks worth of familiarization.

http://eppe.tripod.com/elements.htm
 
And if you start to get tired studying all that chemistry, here is a chemistry humor page from the website that Gokul linked to:

http://eppe.tripod.com/humor.htm
 
Thanks guys, I failed the test...lol :S
 
Oh well. At least you know to study more next time, eh? Hang in there.
 

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