DUE TODAY, PLEASE HELP I'm having trouble with this gas laws assignment, my teacher assigned it yesterday, and my grade will drop if I don't finish, there are 4 questions

Stage in which a star’s outer layers have started to cool and grow outward?

What is the percentage of hydrogen in nitrogen trihydride

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.