Question on Endo/Exothermic reactions

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Discussion Overview

The discussion revolves around identifying endothermic and exothermic reactions based on experimental observations. Participants analyze three specific reactions and seek clarification on the nature of these reactions, including whether they are chemical or physical changes.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant describes the results of their experiment with three reactions and asks for help identifying which are endothermic or exothermic and whether they are chemical or physical changes.
  • Another participant defines endothermic and exothermic reactions, suggesting that the first and third reactions are exothermic, while the second is endothermic, but expresses uncertainty about their conclusions.
  • A third participant agrees with the definitions provided and categorizes the reactions as oxidation, dissolution, and hydration, respectively, but does not provide a definitive answer regarding their classification as chemical or physical changes.

Areas of Agreement / Disagreement

Participants generally agree on the definitions of endothermic and exothermic reactions, but there is no consensus on the classification of the reactions as chemical or physical changes, and the discussion remains unresolved regarding the final classifications.

Contextual Notes

Participants have not provided detailed definitions for chemical and physical reactions, and there are unresolved aspects regarding the classification of the reactions based on the experimental observations.

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Hi, I was doing a small experiment in class today, which was on Endo and Exothermic reactions. Basically, the purpose of this expieriment was to find out which systems underwent exothermic or endothermic reactions. 3 systems had been tested, and here are as follows...
1) Reaction between Steel wool and oxygen gas
2) Reaction between Ammonium chloride and Water
3) Reaction between "Drano" (a type of clog remover) and water

Result
1) - Temp of oxygen gas went up, and condensed
2) - Temperature went slightly down, and the NH4 Cl was completely dissolved
3) - Temperature went up, silver chunks of Drano turned black, and blue foams formed on top
So this is all my data..
My questions are, which ones are endothermic and exothermic reactions, and which ones are chemical and physical changes and why...
Thanks in advance.
 
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Wow, I actually did this last year...that's a shocker.:smile: If remember correctly...

Endothermic- Describes processes that absorb heat energy.
Exothermic- Describes processes that release heat energy.

In exothermic reactions the temperature goes up, in endothermic reactions the temperature goes down.

1. Exothermic
2. Endothermic
3. Exothermic

Although, I'd have to suggest waiting to see what someone else says since I'm afraid to say "take my word for it".:-p
 
Endothermic- Describes processes that absorb heat energy.
Exothermic- Describes processes that release heat energy.
Correct.

An exothermic reaction would produce a temperature increase, an endothermic reaction a temperature decrease.

There are three reactions here:

1. Oxidation, the Fe wool ignites (oxidizes) in oxygen
2. Dissolution - NH4Cl dissolves in water
3. Hydration - anhydrous salt reacts with water

Which one(s) is(are) chemical or physical, and why. Perhaps one can write the definition of chemical and physical reactions.
 
Whoo! thanks a bunch guys, I hope I did well in my lab.. but he's gona be like: "Oh.. I don't like that font, 10% off...No hyphen there.. 20% off...and oh, another 45% off because I don't like you.." :'(
 

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