Round each figure to three significant figures. a. 0.003210 g
d. 25.38 L
b. 3.8754 kg
e. 0.08763 cm
c. 219.034 m
f. 0.003109 mg

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products