A chemical reaction occurs when certain substances are transformed into others. For this to happen, the bonds between atoms and molecules must be broken and must be reestablished in another way. In summary, a chemical reaction is the change of substances to other substances by breaking bonds in reagents and forming bonds in products.
Since these bonds can be very strong, energy, usually in the form of heat, is needed to initiate the reaction. The new substances have different properties than the original substances (reagents).
Answer:In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
I think the correct answer from the choices listed above is option A. The difference between a normal cell and a cancer cell is that a normal cells undergo while cancer cells don't Also, normal cells respond to signals while cancer cells don't.
