What is the mass of sulphate ions 96.06 in 25.0ml of a 0.125 solution

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

Rays from the sun are not considered matter true or false