What test could be done to ensure that all of the basic CaCO3 has been dissolved in Hydrochloric acid, so the acid is the excess reactant?

Consider the balanced equation below. n2h4 + 2h2o2 n2 + 4h2o what are the mole ratios of hydrazine (n2h4) to hydrogen peroxide (h2o2) and hydrazine to water? 1: 2 and 1: 4 1: 3 and 1: 4 1: 2 and 3: 5 1: 3 and 3: 5

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc