An aluminum engine block has a volume of 4.61 l and a mass of 12.72 kg. what is the density of the aluminum in grams per cubic centimeter?

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

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?