la ecuación química que representa la siguiente descripción de una reacción química: Un átomo de hierro (Fe) en estado sólido reacciona con dos moléculas de ácido clohídrico (HCl) en estado acuoso produciendo una molécula de dicloruro de hierro (FeCl2) en estado sólido y una molécula de Hidrógeno diatómico (H2) en estado gaseoso

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.)

What two categories of toxins were present in the air at dish,texas as a result of the gas pipelines that pass through the area

Identify the decay mode particle emitted from the th 234