|
The fizz in soft drinks is produced by adding ____.
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calcium
|
|
Hard water contains ____ and magnesium ions.
|
carbonic acid
|
|
Milk (pH 6.7) is slightly acidic because it contains ____.
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fluoride
|
|
Iron can oxidize to iron oxide, which is also known as ____.
|
graphite
|
|
The core of a pencil contains ____ (made of carbon not lead).
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lactic acid
|
|
Mixing HCl and NaOH produces ____ (table salt) and water.
|
NaCl
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|
Sodium ____ is added to toothpaste to harden tooth enamel.
|
ozone
|
|
Dioxygen (O2) and ____ (O3) are allotropes of oxygen.
|
rust
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