8. What must occur for a change to be a chemical reaction? a. There must be a change in chemical properties.
b. There must be a change in physical properties.
The change must involve a change in volume.
d. The change must involve a change in mass.
C.
320 lluminate Education in

A. there must be a change in chemical properties  

Explanation:

its going to be mutualism cuz they both benefit from the relationship.

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> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.