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Water - PowerPoint PPT Presentation


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Water. How can water be physically changed? How can water be chemically changed?. Chemical Change. any change in which a new substance is formed with new physical properties. This involves breaking bonds and forming new ones with other elements

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Presentation Transcript
water
Water
  • How can water be physically changed?
  • How can water be chemically changed?
chemical change
Chemical Change
  • any change in which a new substance is formed with new physical properties.
  • This involves breaking bonds and forming new ones with other elements
  • Evidence: Release of energy as heat and light, change in colour, formation of gas, change in odour, etc.
physical change
Physical Change
  • breaking the attraction forces between adjacent molecules so that they are more spread apart
  • Simply put, it is a phase change where no new substance is made
changes in water
Changes in Water

Chemical Change

Physical Change

types synthesis
Types: Synthesis
  • Example C + O2
  • C
  • C
  • +
  • O
  • General: A + B AB
  • O
  • O
  • O
types decomposition
Types: Decomposition
  • Example: NaCl
  • +
  • Na
  • Na
  • Cl
  • Cl
  • General: AB A + B
types decomposition1
Types: Decomposition
  • Example: NaCl

2

2

  • +
  • Na
  • Na
  • Cl
  • Cl
  • Cl
  • General: AB A + B
types decomposition2
Types: Decomposition
  • Example HgO
  • Hg
  • General: AB A + B
  • O
types decomposition3
Types: Decomposition
  • 2HgO 2Hg + O2
  • Hg
  • Hg
  • Hg
  • Hg
  • +
  • General: AB A + B
  • O
  • O
  • O
  • O
types single re placement
Types: Single replacement
  • Example: CuCl2+ Zn
  • +
  • +
  • Cl
  • Cl
  • Cl
  • Cl
  • Zn
  • Zn
  • Cu
  • Cu
  • General: AB + C AC + B
types double displacement
Types: Double displacement
  • Example: Pb(NO3)2+ KI

NO3

  • K
  • +
  • Pb
  • I
  • General: AB + CD AD + CB
  • NO3
types double replacement
Types: Double replacement

Example: Lithium sulfide + Zinc Fluoride

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