Which part of this chemical reaction is the Brønsted-Lowry base? BrO + H2CO3 --> HCO3 + BrOH

BrO
HCO3
H2CO3
BrOH

How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water(k=1.86 c/mol/kg for water and i=1 for sugar

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays

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