Why does Terry Lovell say that different products have different use values for different people? ​

What are the similarities of physical and chemical change ?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d