An unexpected change in is a sign that a chemical reaction may have occured.

Substances giving off a smell or
while being combined is also an indicator of a chemical

Draw two cyclic constitutional isomers of cis-1

How does blood clotting prevent the entry of pathogens through cuts and wounds? answer asap,, this is due tomorrow. will mark as brainliest or whatever you call it : )

What are the similarities between compounds and mixtures?