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Water

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

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  1. Water • How can water be physically changed? • How can water be chemically changed?

  2. 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.

  3. 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

  4. Changes in Water Chemical Change Physical Change

  5. Types of Chemical Reactions

  6. Types: Synthesis • Example C + O2 • C • C • + • O • General: A + B AB • O • O • O

  7. Types: Decomposition • Example: NaCl • + • Na • Na • Cl • Cl • General: AB A + B

  8. Types: Decomposition • Example: NaCl 2 2 • + • Na • Na • Cl • Cl • Cl • General: AB A + B

  9. Decomposing Molten NaCl

  10. Types: Decomposition • Example HgO • Hg • General: AB A + B • O

  11. Types: Decomposition • 2HgO 2Hg + O2 • Hg • Hg • Hg • Hg • + • General: AB A + B • O • O • O • O

  12. Types: Single replacement • Example: CuCl2+ Zn • + • + • Cl • Cl • Cl • Cl • Zn • Zn • Cu • Cu • General: AB + C AC + B

  13. Types: Double displacement • Example: Pb(NO3)2+ KI NO3 • K • + • Pb • I • General: AB + CD AD + CB • NO3

  14. Types: Double replacement Example: Lithium sulfide + Zinc Fluoride

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