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Unit 4 Power Point
 

Unit 4 Power Point

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    Unit 4 Power Point Unit 4 Power Point Presentation Transcript

    • Physical Science
      Chemical Properties
    • Atoms and Molecules
      An Atom is made up of protons, electrons, and neutrons.
      An Element is a unique number of protons.
      When 2 or more atoms combine together chemically, it is called a molecule.
    • Molecular Elements
      These are allotropes of carbon
    • Compounds
      2 or more elements combined in a molecule
    • What is a Chemical Reaction?
      It is the rearrangement of atoms to form new molecules.
      CH4 + 2O2 CO2 + 2H2O
    • What is a Chemical Reaction?
      It is the rearrangement of atoms to form new molecules.
      CH4 + 2O2 CO2 + 2H2O
    • What is a Chemical Reaction?
      It is the rearrangement of atoms to form new molecules.
      CH4 + 2O2 CO2 + 2H2O
    • What is a Chemical Reaction?
      Some chemical reactions are exothermic
      They release energy as heat, light, or other forms.
    • What is a Chemical Reaction?
      Some chemical reactions are endothermic
      They absorb energy from the environment to proceed.
    • Chemical Properties
      Chemical properties can only be observed when the substances in a sample of matter are ________________.
      _____ and _____ are examples of chemical properties
    • Chemical Properties
      Chemical properties can only be observed when the substances in a sample of matter are ________________.
      Changing into different substances
      _____ and _____ are examples of chemical properties
    • Chemical Properties
      Chemical properties can only be observed when the substances in a sample of matter are ________________.
      Changing into different substances
      _____ and _____ are examples of chemical properties
      Flammability
      Reactivity
    • Triggers to Chemical Reactions
      Most reactions do not occur spontaneously.
      Most require some trigger to get started.
      This could be a spark or even a touch.
      Let’s watch a fun video of a chemical reaction that is sensitive to the touch!
    • Nitrogen Triiodide
      2 NI3 (s) -> N2 (g) + 3 I2 (g),
    • Nitrogen Triiodide Decomposition
    • Some Fun Experiments
      Mr. Taylor Does Nitrogen Triiodide
      http://www.youtube.com/watch?v=hERVtZEZrFQ
    • Some Fun Experiments
      THERMITE!
      http://www.youtube.com/watch?v=sjLgzgflCk8
    • Some Fun Experiments
      Pure Metallic Sodium in Water!
      http://www.youtube.com/watch?v=gFnNXkcoDSs
    • Recognizing Chemical Change
      Chemical changes are taking place if you see a _____, ______, or ______.
      Change in color
      Production of a gas
      Formation of a precipitate
      **If you are watching by recording, send me the sentence above with the answers**
    • Mixtures
      Iron and Sulfur powder in a the mixture
      So, it is hypothesis time:
      How can we separate the iron from the sulfur?
      Enter some ideas in the chat box.
    • Mixtures
      Iron and sulphur – the mixture
      How can we separate the iron from the sulphur?
      Use a magnet!
      Iron is magnetic, sulfur is not...
    • Turning an iron-sulphur mixture into a Compound
      Heat
      Fe + S FeS
    • When iron and sulphur react
      +
      sulphur (S) atoms iron (Fe) atoms
    • When iron and sulphur react
      +
      sulphur (S) atoms iron (Fe) atoms
      iron sulphide (FeS) molecules
    • Differences between compounds and mixtures
      MIXTURES
      COMPOUNDS
      Mixtures can be separated easily
      Compounds can not be separated
    • Differences between compounds and mixtures
      MIXTURES
      COMPOUNDS
      Mixtures can be separated easily
      Mixture have the properties of the substances present in it
      Compounds can not be separated
      Compounds do not have the properties of the elements
    • Differences between compounds and mixtures
      MIXTURES
      COMPOUNDS
      Mixtures can be separated easily
      Mixture have the properties of the substances present in it
      No chemical change takes place when a mixture is made
      Compounds can not be separated
      Compounds do not have the properties of the elements
      A compound is always formed due to a chemical reaction
    • Differences between compounds and mixtures
      MIXTURES
      COMPOUNDS
      Mixtures can be separated easily
      Mixture have the properties of the substances present in it
      No chemical change takes place when a mixture is made
      There is no heat taken in or given out when a mixture is made
      Compounds can not be separated
      Compounds do not have the properties of the elements
      A compound is always formed due to a chemical reaction
      Heat is either taken in or given out when a compound is made
    • Differences between compounds and mixtures
      MIXTURES
      COMPOUNDS
      Mixtures can be separated easily
      Mixture have the properties of the substances present in it
      No chemical change takes place when a mixture is made
      There is no heat taken in or given out when a mixture is made
      A mixture can contain elements in any proportion
      Compounds can not be separated
      Compounds do not have the properties of the elements
      A compound is always formed due to a chemical reaction
      Heat is either taken in or given out when a compound is made
      A compound always contains the elements in fixed proportions, e.g. FeS contains 7g of iron to 4g of sulphur