All chemical reactions involve a change in?
Chemical reactions involve the making and breaking of bonds. Reactions, therefore, involve changes in the electronic arrangement/structure of molecules.
Endothermic reactions and exothermic reactions all involve something called an enthalpy change: a change in the amount of energy a chemical contains. The difference here is that exothermic reactions release heat energy to their surroundings, whereas endothermic reactions absorb heat from their surroundings (in effect, getting colder).
Answer Nuclear reactions involve changes in the nucleus of atoms -- the number of protons and/or neutrons is changed. Chemical reactions do not cause any changes at all in the nucleus. Instead, in a chemical reaction, the electron clouds of atoms are interacting, and all changes are occurring with the electrons that surround the nucleus.
- all additives for foods are chemical products - cooking involve chemical reactions - preservation of foods involve frequently chemical procedures - agrochemistry is an important branch of chemistry - pesticides are chemical products - fertilizers are chemical products - industrial production of many foods including drinks are chemical processes - all foods are analyzed by analytical chemistry methods
Temperature change. The fourth class of reactions is much more difficult to detect than the previous three. This fourth class is really the basis of the other three. Every chemical reaction involves energy in some form, because all chemical reactions involve the breaking of old bonds, the forming of new bonds, or both. We know that every chemical bond contains energy, or it would not exist. This result means that every chemical reaction involves an…