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