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Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
Atomsandmolecules 100919202417-phpapp02
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Atomsandmolecules 100919202417-phpapp02

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  • 1. Do NOT make an ATOM an ION unless it tells you too! THIS MEANS- Do NOT make an ATOM stable unless it tells you to do so . To determine the charge of a picture of an atom look at the number of protons and electrons in the picture and determine the charge. (Examples are on the next slide.)
  • 2. Review: What is the charge of this ATOM ? Just use the number of protons and electrons that are given .
  • 3. What is the charge of this ATOM? Just use the number of protons and electrons that are given. -2
  • 4. We will discuss: Chemical Symbol Atoms Elements Bonds Compounds Molecules Chemical Formulas Endothermic Reactions Exothermic Reactions
  • 5. All matter is made of _____________.
    • Atoms
    Why would an atom combine with other atoms? To make the atom stable When an atom combines with another atom, this forms a ______________________? Molecule
  • 6.
    • When atoms are joined together, they form a
    • _____BOND______.
    • Atoms bond together for a very simple reason: atoms like to have full valence shells . (8 electrons)
    • Atoms will share, give away, or gain electrons when forming a bond.
    • Substances in which 2 or more elements have bonded together form a material with unique chemical properties.
    • Example : water - 2 Hydrogen atoms bonded to 1 Oxygen atom. H2O
  • 7. 6 C 12 Chemical Symbol
  • 8. Molecules
    • Are made of ______________ that have been joined together.
    ATOMS
  • 9. Molecules form when atoms join Element Compound There are two types of molecules
  • 10. Element Molecule
    • Element
      • If a substance has two or more of the same atoms it is a molecule that is an Element
      • Ex. O (the oxygen we breathe) is made out of two oxygen atoms
      • Other examples of Element Molecules:
      • H N
      • O
    2 2 3 3
  • 11. Molecules Element H 2 If all atoms in a molecule are alike, then the molecule is classified as an _______________. ELEMENT
  • 12. Molecules form when atoms join Compound The other type of molecule is a compound. Do you think that the atoms joined together in a compound are all the same? NO! The atoms are different.
  • 13. Compound Molecules
    • A combination of two or more different elements (atoms)
    • Examples:
      • 1 Na atom + 1 Cl atom = the compound NaCl
      • 2 H atoms + 1 O atom = the compound H O
    • The examples above are compounds because the molecule is made out of _____________ atoms.
    2 DIFFERENT
  • 14. Energy in Chemical Reactions
    • Often energy is released or absorbed in chemical reactions.
    • Where does the energy come from?? Bonds break or form from electrons being lost or gained.
    • Energy is released when there is less energy in the products than the reactants. This is called an EXOTHERMIC reaction.
    • If energy is absorbed there is less energy in the reactants than the products. This is called an ENDOTHERMIC reaction.
    • Exo = out Endo= in
  • 15. Chemical Formulas- represent a molecule O C O The chemical formula of this model is CO 2
  • 16. CO
    • Chemical Formula
    2 C Chemical Symbol
  • 17. The Chemical Formula use symbols and numbers called subscripts to show the elements and number of atoms that make up the molecule.
    • H O
    2 Chemical Symbols Subscript Note: there are 2 hydrogen atoms and 1 oxygen atom. The one behind the O is imaginary. How many atoms are there? _____ 3
  • 18.
    • H O
    • Tells Us:
    • There are ______ atoms of hydrogen and _____ atoms of oxygen.
    • The name of the elements which are ____________ and ______________.
    2 2 1 Hydrogen Oxygen
  • 19. CO represents? Co represents? Fe O represents? 2 3 1 atom of carbon and 1 atom of oxygen 1 atom of cobalt 2 iron atoms and 3 oxygen atoms
  • 20. Chemical Formulas cont.
    • Writing chemical formulas:
      • Follow right to left pattern on the Periodic Table of Elements
        • Ex. NaCl sodium is a metal located on the far left and Cl is located farther to the right
        • Therefore, the formula is written as NaCl instead of ClNa
  • 21. If a molecule is made out of one type of atom, it is called
    • A. Element
  • 22. If a molecule is made out of different types of atoms it is?
    • B. Compound
  • 23. Chemical Equations
    • Chemical equation tells about a chemical reaction.
    • It shows the substances we start with.
    • It shows the new substances that are formed.

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