Figuring Out Enthalpy Changes in High School Chemistry Labs

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Discussion Overview

The discussion revolves around identifying suitable chemical reactions for a high school lab aimed at measuring enthalpy changes. Participants explore various reactions that could produce significant temperature changes and are accessible with common high school chemicals.

Discussion Character

  • Exploratory, Homework-related

Main Points Raised

  • One participant suggests using magnesium and hydrochloric acid as a potential reaction, although they consider it a last resort due to their teacher's preference for double displacement reactions.
  • Another participant proposes the neutralization reaction between sodium hydroxide and hydrochloric acid, also noting it as a last resort.
  • A third participant mentions the reaction of sulfuric acid with sugar, describing it as fun and exothermic, while questioning its classification as a double replacement reaction.
  • Another participant recommends neutralization reactions for their measurable heat changes and ease of checking reactant concentrations.

Areas of Agreement / Disagreement

Participants express varying opinions on which reactions are suitable, with no consensus on a single preferred reaction. Some suggest neutralization reactions while others consider alternative reactions, indicating a lack of agreement on the best approach.

Contextual Notes

Participants have not fully explored the implications of reaction types, such as the classification of reactions or the specific enthalpy changes associated with each proposed reaction. There are also unresolved questions about the expected heat changes in some reactions.

Who May Find This Useful

High school chemistry students and educators interested in practical experiments for measuring enthalpy changes in chemical reactions.

soggybread
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Well, my chemistry teacher is extremely confusing, and wants us to create our own lab where we figure out the enthalpy changes in a chemical reaction. Is there are reaction out there that would give a considerable change in temperature, while using chemicals typically found in a high school? As an aside, he also gave us an option to

Here's what I've come up with so far... it would be great if I could get some feedback on these reactions.

1. [tex]Mg_ (s) + HCl_ (aq)[/tex]

(Last resort, because my teacher recommends a double displacement reaction)

2. [tex]NaOH_ (aq)+ HCl_ (aq)[/tex]

(Another last resort, because my teacher recommends a double displacement reaction)

3. [tex]CuSO_4_(aq) + 2NaCl_ (aq)[/tex]

(I have no idea if there's going to be any heat change from this)
Any help on this would be fantastic and very much appreciated!

Thanks,

soggybread
 
Last edited:
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You can perform a simple calorimetry experiment, have you been exposed to this concept so far?
 
sulfuric acid to sugar is really fun... is that a double replacement... I'd have to think... but it does let off a lot of heat... and the charred black mess is awesome.

Edit: they are calling it a "DEHYDRATION/HYDRATION" reaction:
http://chemlearn.chem.indiana.edu/demos/TheDehyd.htm
 
Last edited:
Neutralization should be OK - enough heat to measure and concentrations of reactants easy to check.
 

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