Omotorista de um automovel desejadeseja percorrer 40km com velocidade media de 80 km\h. nos primeiros 15 minutos, ele manteve a velocidade media de 40 km\h. para cumprir seu objetivo, ele deve fazer o restante do percursocom velocidade media, em k\m?

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.)

How does concentration affect reaction rate

What is the number of neutrons in an atom with atomic mass of 35