|
Dioxygen (O2) and ____ (O3) are allotropes of oxygen.
|
calcium
|
|
Typically, ____ (pH 2.5) contains 5% acetic acid by volume.
|
dry ice
|
|
The core of a pencil contains ____ (made of carbon not lead).
|
graphite
|
|
The solid form of carbon dioxide (CO2) is ____.
|
hydrogen
|
|
Milk (pH 6.7) is slightly acidic because it contains ____.
|
lactic acid
|
|
The electrolyte in a car battery is ____.
|
ozone
|
|
When some metals react with acids, ____ gas is released.
|
sulfuric acid
|
|
Hard water contains ____ and magnesium ions.
|
vinegar
|
