What is conserved during a chemical reaction?
a. mass, only
b. charge, only
c. both mass and charge
d. neither mass nor charge

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Select the correct answer how does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed? ca the value of is negative the value of qis positive the value of a remains constant the value of a decreases the value of equals zero e

Stage in which a typical star has completely stopped fusion