At what period of life do a girl is already capable of reproduction?

Describe in detail the melting point behavior of the 80: 20 benzoic acid-mandelic acid mixture

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?