what might be some clues that would help us know whether or not the change is chemical.
This site gives you several clues about chemical changes -- odor changes, color changes, and more.
http://www.ric.edu/faculty/ptiskus/chemical/
chemical: burn, puts off an odor, forms precipitate, new substance
physical: changes state, same substance
thank you very much. that helped me a great deal.
You're very welcome.
thanks a heap i appreciated it a lot.:)
To determine whether a change is chemical, you can look for certain clues or indicators. Here are some factors to consider:
1. Formation of a new substance: Chemical changes often involve the creation of new substances with different properties than the original ones. If you notice the formation of a new solid, liquid, or gas, it could indicate a chemical change.
2. Color change: A noticeable shift in color during a reaction can be an indication of a chemical change. For example, if a clear liquid turns yellow or a white powder changes to a dark brown, it suggests a chemical transformation.
3. Production of gas: The release of gas, such as bubbling or fizzing, is commonly associated with chemical reactions. This can be observed when a reactant reacts with another to form a gaseous product.
4. Temperature change: Significant temperature variations, either an increase or decrease, can be an indication of a chemical change. The reaction might be exothermic (releases heat) or endothermic (absorbs heat), leading to a noticeable shift in temperature.
5. Formation of a precipitate: A precipitate is the solid substance that forms when two liquids react. If you observe the formation of a solid (precipitate) during a reaction, it suggests a chemical change.
6. Irreversibility: Most chemical reactions are irreversible, meaning it is difficult or impossible to revert the substances back to their original form. If the change cannot be easily undone, it is likely a chemical change.
By observing these clues, you can make an informed judgment about whether the change is chemical or not. It is important to note that these clues work as indicators and should be considered collectively rather than individually for a more accurate assessment.