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The only way to be sure a chemical reaction or change has occurred is to test the composition of a sample before and after a change.

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14y ago

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The only sure evidence for a chemical reaction?

If the item changes form and substance chemically.


How can you be sure that at least one chemical change has occurred?

You can be sure that a chemical change has occurred if there is a change in color, formation of a precipitate, evolution of gas, or absorption/release of heat during the reaction. These are all indicative of a chemical reaction where the substances are transformed into different compounds with new chemical properties.


What is the only sure way to prove that a chemical reaction has occurred?

The only sure way to prove that a chemical reaction has occurred is to demonstrate a change in the chemical composition of the substances involved. This can be done by analyzing the reactants and products using techniques such as spectroscopy, chromatography, or mass spectrometry to identify any new substances formed. Additionally, measuring physical changes such as color, temperature, gas production, or precipitate formation can also provide evidence of a chemical reaction taking place.


What form of evidence do you need to show that a chemical reaction has taken place?

You must video tape it and make sure the final result is either a physical change or a chemical change.


Is emission of light evidence of chemical reaction?

Yes, emission of light can be evidence of a chemical reaction. Some reactions produce light as a byproduct, a phenomenon known as chemiluminescence. This occurs when the reaction releases energy in the form of light rather than heat.


The only sure evidence for a chemical reaction is?

A kind of chemical bond in the possible reaction products that did not exist in the reactants, or a kind of chemical bond in the reactants that does not exist in the possible reaction products.


Is a chemical reaction life science?

i am not completely sure but i think it (chemical reaction) describes when two or more atoms bond together


Why does a chemical reaction not happen immediatlety?

well I'm not really sure but i think it needs time to mix in with each other and then it will cause a chemical reaction.


What is the chemical equation for the chemical reaction?

To construct an equation for a chemical reaction, put the reactants on the left, and the products on the right, and make sure that the number of atoms of each element is the same on each side.


What is a balanced chemical equation showing the formula of each reactant and product in the reaction?

Sure, could you please provide the reaction you would like to see a balanced chemical equation for?


What is it called if two or more elements are involved in a chemical reaction?

I think it is called a compound, but not sure


What is the resut of a chemical reaction?

The result of a chemical reaction is a change in the properties and composition of the reactants to form one or more products with different chemical properties. This change is due to the rearrangement of atoms and the breaking and forming of chemical bonds during the reaction.