To determine the density of a solution, Jack first weighs an empty beaker. Then he uses a buret to add a sample of the solution to the beaker, and weighs the beaker again. He records his data in the table shown.
Initial buret volume
Final buret volume
Initial beaker mass
Final beaker mass
3.19 mL
14.62 mL
120.38 g
131.95 g
What is the density of the solution?

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.