what are chemical reactions?

Answer 1

the result of mixing two or more chemicals such as boiling, freezing...

Answer 2

A chemical reaction is when two or more substances bond together as a result of the exchange or sharing of electrons (i.e., ionic or covalent bonds). There is a lot more I could say in terms of all the types of bond and what exactly happens, but that is my brief answer.

In terms of being able to TELL if a reaction is chemical (as opposed to physical), there are some indications. For one ask yourself if the reaction is REVERSIBLE. For example, when water changes to ice, you can reverse this so, this is a PHYSICAL change or reaction. Making a cake, however, is the result of a chemical reaction. Other indicators of a chemical reactions are : color change, the release of heat, the release of light (e.g., fire), a loud sound, a sudden decrease in temperature.

None of these tell you FOR SURE that something is a chemical change, but they are very good indicators.

Rob

Answer 3

Found two definitions:

#1noun: (chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water" .
WordNet® 2.1, © 2005 Princeton University


#2: A process in which atoms of the same or different elements rearrange themselves to form a new substance. While they do so, they either absorb heat or give it off.
[Chapter:] Physical Sciences and Mathematics
WordNet® 2.1, © 2005 Princeton University

Answer 4

Chemical reactions are physical rearrangements of the bonds between atoms, involving *only* the electrons of the participating atoms.

Answer 5

You can probbely get better, more detailed answers, but essentially it is the interactions of the valence (outer) shell electrons between atoms or groups of atoms.

This is sometimes accompanied by other factors, such as heat, spark, etc.

Answer 6

best way to find out that would be ask Aly and Aj o baby i love those two chicks. but let me tell you my simple definition: A change in the arrangement of atoms or molecules to yield substances of different composition and properties

Answer 7

they are reactions between a acid and a base

for example

vinegar mixed with baking soda

Answer 8

ask Aly and AJ

Answer 9

acid and stuff