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 Evidence: Release of energy as heat and light, change in colour, formation of gas, change in odour, etc.

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 Chemical Change Physical Change

Types of Chemical Reactions

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

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

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

Decomposing Molten NaCl

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

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

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

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

Types: Double replacement Example: Lithium sulfide + Zinc Fluoride