I know an endothermic reaction is when heat is absorbed, but is that a chemical or a physical reaction? Please help me be less confused about science!
Thank You!
2007-09-23 05:51:14 · 6 answers · asked by Hello! 3 in Science & Mathematics ➔ Chemistry
Thanks for confirming that it is a chemical reaction. And I'm sorry I meant to say chemical change or physical change. Now, we dissolved ammonium nitrate in water. The water turned colder. Except I was taught that a new substance is always formed during a chemical change. What new substance was formed in this experiment?
2007-09-23 07:32:46 · update #1
Sorry about this but can you please explain it in a way that a 14 year old can understand it? The answers so far are great and simple to understand . but I don't really want to have to spend an hour on wikipedia researching all the terms.
2007-09-23 07:35:50 · update #2
If heat is being absorbed into the reaction, that depends on what is going on. If you are melting a substance, then it is a physical reaction. There is no change in the substances. However, if the energy absorbed into the reaction because of breaking/formation of bonds, changing of reactants to products, then it is a chemical reaction.
2007-09-23 06:02:02 · answer #1 · answered by Jo 4 · 0⤊ 0⤋
Endothermic Chemical Reaction
2016-12-11 08:22:35 · answer #2 · answered by hole 4 · 0⤊ 0⤋
Physical Reaction
2016-11-07 00:42:04 · answer #3 · answered by Anonymous · 0⤊ 0⤋
It's a physical reaction. There are no changes taking place to the molecules within the bacteria. The alcohol in hand sanitizer works by stripping away the polysaccharides (sugars-based polymers) that coat the outside of the bacteria. It's also possible that once this outer layer is removed, the alcohol can act as a dehydrating substance, removing water from the cellular structure of the bacteria (like pouring salt on a slug). I'm not sure whether it would be an exothermic or endothermic reaction. If it's a question of the alcohol evaporating, then it would be endothermic with regards to the alcohol (this is also why your skin feels cool after being rubbed with a alcohol swab), and exothermic with regards to your skin.
2016-05-17 04:34:34 · answer #4 · answered by ? 3 · 0⤊ 0⤋
A chemical reaction accompanied by absorption of heat from the system is called an endothermic reaction and a reaction which is accompanied by emission of heat is an exothermic reaction. So, it refers to a chemical reaction. Simple heating or cooling of the system is not referred that way.
2007-09-23 06:01:35 · answer #5 · answered by Swamy 7 · 0⤊ 0⤋
what's a physical reaction?
i know of physical and chemical change, but only of chemical reactions.
the question itself is flawed.
2007-09-23 05:57:55 · answer #6 · answered by bob dole 2 · 0⤊ 1⤋