Determine the amount of substance and the mass of zinc and hydrochloric acid required to obtain hydrogen with the amount of substance of 0.5 mol: Zn + 2HCl = ZnCl₂ + H₂

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

What relationship exists between an enzyme and a catalyst?

Select the correct answer from each drop-down menu. to make a table of the elements, dmitri mendeleev sorted the elements according to their . he then split the list of elements into several columns so that elements beside each other had similar .