Label each of the following changes as a physical or chemical change.
A. A mirror is broken.
B. An iron nail corroded in moist air.
C. Copper metal is melted.
D. A catalytic converter changes nitrogen dioxide to nitrogen gas and oxygen gas.
Answer (2)
The changes can be classified as follows: breaking a mirror and melting copper are physical changes, while corrosion of an iron nail and the reaction in a catalytic converter are chemical changes. A physical change does not alter the composition, whereas a chemical change does. Understanding these differences is crucial in chemistry. ;
The mirror breaking and melting copper are physical changes as they do not alter chemical composition. The corrosion of an iron nail and the reaction in a catalytic converter are chemical changes since they produce new substances. Understanding these distinctions is essential in chemistry.
;
