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1.2 Chemical Compounds

1.2 Chemical Compounds. Elements. Recall that elements are just one type of atom. Compounds. Compounds are substances made from two or more different kinds of atoms Most substances you see around you are compounds Plastics, glass, water, wood, gasoline. Properties of Compounds.

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1.2 Chemical Compounds

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  1. 1.2 Chemical Compounds

  2. Elements • Recall that elements are just one typeof atom

  3. Compounds • Compounds are substances made from two or more different kinds of atoms • Most substances you see around you are compounds • Plastics, glass, water, wood, gasoline

  4. Properties of Compounds • Different compounds have very different properties • Remember there are physicaland chemical properties • Try to come up with examples of each

  5. Compound vs. Atoms • The key thing to remember: Properties compounds are different from the properties of the atoms it is made of Ex: Sodium (Na) metal is explosive in water and would surely hurt to eat, while chlorine(Cl)is a poisonous gas that would kill you if inhaled • But salt, sodiumchloride, is tasty on food and totally unreactive with water!

  6. Where do they come from? • Compounds are formed during chemical reactions • Remember the chemical reaction between chlorine gas and sodium metal to produce sodium chloride (salt) • Or the reaction between water and any alkali metal to produce hydrogen gas

  7. Chemical Formula • Compounds can be represented by a chemical formula • It tell the chemist which elements are in the compound • Its also shows how many atoms of each element are present in one unit of compound. • Ex: water, H2O is a compound • There are 2 hydrogen atoms and 1 oxygen atom for every molecule of water

  8. More examples of compounds • Look at the list of compounds onPg.12 • How many of each type of atom are in each compound?

  9. Mixtures • Two or more different substances that are NOT chemically combined • Can be separated by a physical process Ex: Salt water is a mixture -Salt a compound, NaCl dissolved in water, H2O, which is also a compound. Salt and water can be separated by evaporating the salt – a physical process

  10. Particle Pictures • The following particle pictures will help to visualize the difference between elements, compounds and mixtures • You should draw some examples in your notes to help you remember

  11. Element Compound Mixture

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