State the difference between a physical change and a chemical change, and list three indications that a chemical change has occurred. Which indication is most suggestive of a chemical reaction?

Color change is a good way to tell that a change has occurred, and there's really nothing more to say about that. However, I would warn you against using color...

Different combinations of atoms have different physical properties. For instance, when iron rusts, its melting point lowers.

Chemical change is characterized by the formation of new substances and the making and breaking of strong chemical bonds. Usually the best indication that chemical change has occurred is by...

It follows that whatever atomic mass is quoted on the Periodic Table, the most abundant isoptope of that element must make the greatest statistical contribution. Calcium has an atomic mass...

Since 8x3=24 and since 12x3=36 you need to add 6oz of chemical B to have 24oz of chemical A and 36oz of chemical B. Take 1/3 of the total mixture...

...i.e.. solid to liquid, liquid to gas...and vice versa. And certainly, , mass per unit volume, changes markedly upon a phase change between a condensed phase, solid or liquid, and...

Both baking sodas and Calcium Chloride are ionic substances. The products formed are; the $Na^+$ cation from joins with the $Cl^-$ anion AND the $Ca^2+$ cation joins with the $HCO_3^-$...

And typically chemical change is accompanied by a colour change, or by the formation of an insoluble precipitate or by the evolution of a gas. Some chemical reactions are more...

In a more clear form, the reaction is $"P"_4 (s) + 6"Cl"_2 (g) rarr 4"PCl"_3 (l)$ We're asked to calculate how much of the excess reactant (which we have to...

this is the difference between physical and chemical change It can also be explained from their names