Oxygen is found as O2 because its outer energy level has 6 electrons. By covalent sharing, stability is achieved.Oxygen can be found on most of the earth and is needed by many living beings. Our atmosphere is composed of about 20% oxygen!
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Explanation:
In a chemical reaction, the atoms do not change (like in radioactive reactions) but merely rearrange themselves to form new compounds by creating new bonds between atoms. If the bonds are of a lower energy state, this will be favoured in a chemical reaction because chemical reaction always seeks products with the lowest Gibbs free energy. Therefore spontaneous reactions will usually be those chemical reactions whose products are of a lower energy state than the reactants. These chemical reactions usually don’t need high activation energies to ‘jumpstart’ them.
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Answer: An igneous rock that cools rapidly is made of really small mineral crystals.
Explanation:
The layers inside the earth are hot enough to melt a rock. The liquid or molten rock is known as magma.
When a molten rock cools and solidifies, it results in the formation of an igneous rock.
The slow cooling of magma will result in the formation of an igneous rock with large crystals. Whereas, rapid cooling of lava will result in the formation of an igneous rock with small crystals.
Thus, it can be concluded that an igneous rock that cools rapidly is made of really small mineral crystals.