R1.3.1 and 2 - Combustion reactions

Reactive metals, non-metals and organic compounds undergo combustion reactions when heated in oxygen.

Reactive metals combustion (aka. oxidation)

Precious metals do not oxidized (not reactive) therefore they stay shiny longer ie. more expensive.

Note: review how to predict the charge of the metal based on the group

Non-metals combustion

non-metal + oxygen → non-metal oxide

S(s) + O₂(g) → SO₂(g) 

Organic compounds combustion includes: hydrocarbons and alcohols

Add oxygen gas to the compound, produce carbon dioxide and water (in all cases)

Hydrocarbon

Alcohols

Complete vs. incomplete combustion

Key idea is that incomplete combustion yield less energy and the products of incomplete combustion still contain energy (they can be further oxidized to yield more energy)

Complete combustion produce carbon dioxide and water (in all cases), incomplete combustion produce carbon monoxide or just solid carbon, C (s). This solid carbon is black and called soot (you can see it on the bottom of the pot or pan)