An alkaline battery produces electric energy according to this equation. Zn + 2MnO2 + H2O ---> Zn(OH)2 + Mn2O3

a. If 30.0 grams of zinc and 45.0 grams of manganese (II) oxide are reacted with excess water, what is the limiting reactant?

b. What mass of zinc hydroxide is produced by the reaction?

Keep 3 sigfigs and include units in your answers.

Can someone me with questions 12 and 13 plz.

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.