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Chemical reactions (Molecules, Polymers and Atoms (Molecular hydrogen (H₂)…
Chemical reactions
Molecules, Polymers and Atoms
Molecular hydrogen (H₂), molecular oxygen (O₂) and molecular nitrogen (N₂) are all molecules but they are not compounds because each is composed of a single element.
Polymers are compounds made of many molecules all linked together in really long chains known as macromolecules. The molecules that repeat themselves within the polymers are called monomers, many monomers attached together make a polymer. We encounter polymers every day, in fact, you have eaten a million polymers already & everything about you is controlled by polymers!
However, water (H₂O) and carbon dioxide (CO₂) are all compounds and molecules because each is made from more than one element.
A single molecule of molecular hydrogen (H₂) is made from two atoms of hydrogen while a single molecule of water (H₂O) is made from two atoms of hydrogen and one atom of oxygen.
Element, Mixture or Compound?
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A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.
Mixtures can be made up of two or more elements, two or more compounds or a combination of elements and compounds. Air is a good example of a mixture. It contains nitrogen, oxygen and many other gases at room temperature and pressure.
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The Periodic Table
A scientist called Dmitri Ivanovich Mendeleev created the periodic table in the 1800s after making a series of observations about the elements he and his fellow scientists worked with. Today, the Periodic table is often referred to as the most important table in Science!
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