Given the equation Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g),
what mass of hydrogen gas is produced when
2.2 g Zn is reacted with excess aqueous hydrocholric acid?
Answer in units of g

What happens to energy in an open system?

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.