Zn +2HCl -> ZnCl2 + H2 what mass of H2 has is produced when 2.5 g of zinc react with an excess of hydrochloric acid?

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c

A0.100-kilogram apple hangs in a tree 1.50 meter above the ground. ignore frictional effects, the total mechanical energy of the apples is