14. Which describes a chemical reaction? a. A substance is changed into new substance with different chemical identity. b. It is a change in phases of materials when exposed to temperatures. c. It is a change in the physical form of materials. d. None of the above 15. All of the following are change in materials when exposed to temperature EXCEPT a. Liquefication b. Sublimation c. lonization d. All of the above
Answer (1)
14. A substance is changed into a new substance with a different chemical identity.→ This is the correct definition of a chemical reaction.15. c. Ionization→ Ionization involves gaining or losing electrons, usually through chemical or electrical means, not just by temperature change.
