What two things do astronomers need to know about a star in order to calculate its luminosity or absolute magnitude? A. color and size B. color and distance C. distance and brightness D. size and distance

3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.