en este experimento usted calculo las densidades usando objetos a temperaturas ambiente. como piensa que cambiaria la densidad del etanol si se hubiera calentado a 50C° antes del experimento

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

What energy is it when you flip on a switch on a lamp