Example 2.1 Construct the formula of magnesium oxide (a compound of magnesium and oxygen). Answer The symbol for magnesium is Mg and it has a valency of two. Imagine it as: Mg Similarly, oxygen could be thought of as: O When magnesium combines with oxygen, the arms link up with one another and there are no free arms left over. The general equation for this reaction is: metal + oxygen → metal oxide. Some metals will react with oxygen when they burn. These reactions are called combustion reactions. Two examples of combustion reactions are: Iron reacts with oxygen to form iron oxide: 4 Fe + 3 O 2 → 2 Fe 2 O 3. Magnesium reacts with oxygen to form magnesium oxide: 2 Mg + O 2 → 2 MgO

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    Once magnesium starts to burn it is almost impossible to extinguish, because it reacts exothermically with oxygen, nitrogen and water. It burns with a bright light and was used for photographic flash bulbs It made an ideal incendiary agent and in some air raids during World War II as many as half a million 2 kg magnesium bombs would be scattered over a city in the space of an hour.

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    Atomic oxygen readily reacts with most spacecraft polymer materials exposed to the low Earth orbital (LEO) environment. If the atomic oxygen arrival comes from a fixed angle of impact, the resulting erosion will foster the development of a change in surface morphology as material thickness decreases.Watch now! IUPAC: Rubidium Hydroxide. Elements involved: Rubidium, Water, Oxygen. Chemical Formula: RbOH. Formula Equation: 2 Rb (s) + 2 H 2 O (l) → 2 RbOH (aq) + H 2 (g). Word Equation: Rubidium + Water → Rubidium hydroxide + Hydrogen

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