Interpret the results of an investigation to determine whether a physical or chemical change has occurred. - PowerPoint PPT Presentation

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Interpret the results of an investigation to determine whether a physical or chemical change has occurred.

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Chemical Changes. A. When substances react to form completely new substances with new chemical and physical properties. 1. How to recognize a chemical – PowerPoint PPT presentation

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Title: Interpret the results of an investigation to determine whether a physical or chemical change has occurred.


1
820
  • Interpret the results of an investigation to
    determine whether a physical or chemical change
    has occurred.

2
Interpret the results of an investigation to
determine whether a physical or chemical change
has occurred.
  • Key concepts/skills
  • Level 1 Define key vocabulary.
  • Level 2 Identify the chemical and physical
  • properties of matter.
  • Level 3 Distinguish between physical and
  • chemical changes given
    investigations
  • or situations.

3
Interpret the results of an investigation to
determine whether a physical or chemical change
has occurred.
  • Key vocabulary
  • Physical properties flammability
  • Physical change reactivity
  • Chemical properties
  • Chemical change

4
Interpret the results of an investigation to
determine whether a physical or chemical change
has occurred.
  • Physical Properties
  • Size, Shape, Color, Odor, Texture, things that
    can be observed with senses
  • Change of state, malleability, ductility,
    conductivity
  • All Physical properties change during a chemical
    reaction
  • Physical Properties gt New Physical Properties

5
Interpret the results of an investigation to
determine whether a physical or chemical change
has occurred.
  • II. Chemical Properties
  • Flammability how easily a substance burns
  • Reactivity how easily a substance reacts with
    others
  • A substances chem. props. Going into a reaction
    change completely and the substance coming out of
    the reaction has new chemical properties
  • D. Chem Props. gt New chem. Props

6
Interpret the results of an investigation to
determine whether a physical or chemical change
has occurred.
  • III. Physical changes
  • A change in physical properties without changing
    the identity of the substance (paper is still
    paper)
  • Note phys props. change but not chem. props.

7
Interpret the results of an investigation to
determine whether a physical or chemical change
has occurred.
  • Chemical Changes
  • When one or more substance changes into new
    substances with new chem. and phys. props.
  • Note Chem. and Phys. props change with a chem.
    Change
  • Chem. Changes are not reversible by any physical
    means

8
Interpret the results of an investigation to
determine whether a physical or chemical change
has occurred.
  • 1. Is gas, heat, or light given off?
  • If Yes Chemical
  • 2. Does the substance maintain its identity?
  • If yes physical
  • 3. Are more than 2 physical properties changed?
  • If yes chemical

9
Interpret the results of an investigation to
determine whether a physical or chemical change
has occurred.
  • Chemical or physical change?
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