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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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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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