Ethanoic acid (common name is acetic acid)
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When alcohol is oxidized by the air, it forms acetaldehyde, which is a toxic compound. This oxidation process usually happens when alcohol is exposed to air for an extended period of time, resulting in a change in flavor and quality of the alcohol.
Water vapor is the substance formed by burning hydrogen and ethanol in air.
When oxygen in the air reacts with iron, iron oxide is formed. This compound is commonly known as rust.
Carbon dioxide is formed when carbon monoxide is oxidized. Carbon monoxide reacts with oxygen in the air in the presence of a catalyst to produce carbon dioxide.
The black substance formed on copper is called copper oxide. It is a chemical compound that forms when copper is exposed to oxygen in the air, resulting in a black or greenish-black tarnish on the surface of the copper.
Yes, a new substance is formed when a candle burns. The wax in the candle combines with oxygen from the air to produce carbon dioxide and water vapor, along with some other byproducts such as carbon monoxide and soot.