| Typically, ____ (pH 2.5) contains 5% acetic acid by volume. |
calcium |
| The core of a pencil contains ____ (made of carbon not lead). |
dry ice |
| Mixing HCl and NaOH produces ____ (table salt) and water. |
graphite |
| Milk (pH 6.7) is slightly acidic because it contains ____. |
lactic acid |
| The solid form of carbon dioxide (CO2) is ____. |
NaCl |
| Iron can oxidize to iron oxide, which is also known as ____. |
ozone |
| Hard water contains ____ and magnesium ions. |
rust |
| Dioxygen (O2) and ____ (O3) are allotropes of oxygen. |
vinegar |
