| Elements in the same group tend to have the same ____. |
activation |
| A catalyst decreases the ____ energy of a reaction. |
charge |
| A salt contains anions and cations, but has no net ____. |
density |
| The ____ of water is about one gram per cubic centimeter. |
hydrogen |
| A solute is dissolved in a solvent to form a ____. |
nonmetal |
| When some metals react with acids, ____ gas is released. |
solution |
| To dilute an acidic solution, slowly add it to ____ while stirring. |
valence |
| Carbon, oxygen, and sulfur are examples of ____ elements. |
water |
