Describe the trend for atomic radius down a group. Use atomic structure (e. g. energy levels, nuclear charge, attraction) to help support your answer. HELP PLEASE

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

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.

If 15 drops of ethanol from a medicine dropper weigh 0.60g, how many drops does it takes from a dropper to dispense 1.0ml of ethanol? density of ethanol is ethanol is 0.80g/ml.