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.