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First let me define covalent and non-covalent bonds.

Covalent bonds are bonds BETWEEN the atoms of a chemical - the atoms share electrons.

Noncovalent bonds are the interactions between atoms (and chemicals) that do NOT involve sharing of electrons. (hydrophobic, hydrophilic, and ionic bonds are non-covalent bonds)

Physical Change: breaking wood in half, melting ice, deflating a balloon, heating/cooling something (burning NOT included), dissolving something (as long as it does not react with solvent). Physical changes do not make or break covalent bonds. Physical changes only break/make non-covalent bonds (such as hydrophobic, ionic or hydrogen bonds).

Chemical Change: burning something, changing the actual chemical makeup in any way - usually by reactions like redox (reduction-oxidation reactions), decomposition and combustion reactions among others. Chemical changes do make and/or break covalent bonds. If the breaking and/or making of covalent bonds occurs - the change is chemical - since you are actually changing the chemical into something new.

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Q: Difference between physical change and chemical change?
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