Saved Bookmarks
| 1. |
How can we say that in given change a chemical reaction has taken place |
|
Answer» There are four signs that a chemical REACTION has occurred: a change in color, a change in temperature, formation of a gas or formation of a precipitate. A precipitate is a solid that forms when two liquid solutions are mixed. As matter CHANGES in a chemical reaction, it can EITHER ABSORB or RELEASE energy. |
|