The addition of a catalyst generally speeds up the rate of a chemical reaction. This happens because the catalyst a. Lowers the activation energy
b. Lowers the starting potential energy
c. Raises the activation energy
d. Raises the enthalpy of the reaction

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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explanation: no but i do not usually comment