The diagram represents a beaker containing sugar, water, and sand. The sugar is dissolved in the water, creating a solution. The sand has settled to the bottom of the beaker. Describe one method to separate the sand from the other substances in the beaker.

10-14. (a) when 100.0 ml of weak acid ha were titrated with 0.093 81 m naoh, 27.63 ml were required to reach the equivalence point. find the molarity of ha. (b) what is the formal concentration of a- at the equivalence point? (c) the ph at the equivalence point was 10.99. find pk. for ha. (d) what was the ph when only 19.47 ml of naoh had been added?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.