Answers and Explanations
PRACTICE TEST 2
1. Part A
1 . D
O− has 9 electrons, while S+ has 15 electrons.
2 . A
Ca+ has 19 electrons, as does K.
3 . C
Cl− has 18 electrons, while F has 9 electrons.
4 . B
H+ has no electrons, while He has 2 electrons.
5 . E
Na+ has 10 electrons, while O– has 9 electrons.
6 . A
Solute is defined as something that is dissolved in a solvent to make a solution. It is the
component that is present in a lesser amount than solvent.
7 . D
In aqueous solutions, the solvent is H 2 O.
8 . B
Solvent is the component of a solution present in the greatest amount. It is the substance in
which the solute is dissolved.