what reactions can show this difference.
120476
They are isomeres. Both are CnH2n.\n\nIn a cycloalkane molecule the C atoms are in a circle.\nAll atoms have been connected by a single bond.\n\nAn alkene molecule has (at least)  two ends. One connection between two C atoms is a double bond. All the other bonds are single.\n\nAlkenes accept very easy chlorine at the double bond.\nCycloalkanes don't.
97902
no, reaction times are too slow at that temperature.  (I'm just guessing, but I'm a chemist.  You should be able to look up reaction energies, try Beilstein.)
376354
Certain things give off a different smell when heated but mostly I don't think you can differentiate. The sensation of smell is caused by particles of the thing in question not by chemicals released.
485303
Probably a t-test. \n\nTell us what hypothesis you are testing.
444434
It can either be a strong acid, like HCl, or a strong base, like NaOH (aq.)  The reactions are:\n2Al + 6HCl => 2AlCl3 + 3H2\n2Al + 2NaOH + 2H2O =>2NaAlO2 + 3H2
438465
A synthesis reaction is when you start off with 2 substances and end up with 1:\nA+B--->AB\n\nFor example \n\nanhydrous copper (II) sulfate + water --> copper sulfate pentahydrate\nCuSO4 + 5H2O  ---> CuSO4* 5H2O\n\nIn this reaction, the color changes from white to blue. So the color change is the evidence.
366045
The sign there is a chemical reaction is the fact there is heat being released.  Evidently, the reactant have more energy, because they are able to release that energy in the form of heat.
295960
Look at their conjugate bases and whichever is more stable will have the weakest acid. PKA values are also easy to prove this becuase it is a realtion of the H+ content.
488217
"The final experiment was to observe the reaction when one small crystal of NH4SCN was added to 0.1 M FeCl3. The color of FeCl3 was yellow, but after NH4SCN was added, the color of contents changed to red.\nIn second experiment, when the Mg was ignited, the resulting flame was hot. Therefore, the release of thermal energy through the interaction of Mg and O was shown.\nFiguring out the type of the last two reactions was difficult, because the chemical equations were not given. However, the possibility that the type of both reactions were replacement reactions was high. The reason being that the chemical reactions were observed as a color change and this means that the composition of the substance is changed.\nThis experiment was very successful, and it was a good opportunity to observe chemical reactions directly."\n\nI would change your paragraph to that.  I would also expand on the other experiments if you know more about them.
437068
where the precipitate is formed you have a chemical reaction because the precipitate signals it, there are also color changes and temp changes that can signal to you that it is a chemical raction.\n\n\nthe other one is a physical reaction
655300
simply put: the higher the concentration the faster the reaction rate. in equilibrium the higher concentration shifts the reaction t o the other side.
219138
H2, or hydrogen gas.\n\nFor example, take magnesium metal and hydrochloric acid.\n\nMg + 2HCl -> H2 + MgCl2\n\nThis is a displacement reaction, in which a free element (Mg) breaks the bond between a compound (HCl) and then bonds to the ion with the opposite charge (Cl-) forming a new compound (MgCl2).  The ion left over (H+) loses its charge and becomes a pure element (H2).
487352
SURFACE AREA INCREASES\n\nIT'S VICE VERSA
319335
1.) do your own homework\n2.) this is the computer forum, not high-school chemistry.  Next time post to the right furom.
517884
The reaction may involve the formation free radicals (unstable) as intermediates but reacts with other free radicals and form stable products.
575648
Compare (what they have in common) and contrast (what are the differences).
352691
the other product is zinc chloride.\nand the reaction is single replacement.