Which of the following is a correct example of physical change? burning a piece of wood oxidation of an object's surface slicing through a block of sodium changing the chemical identity of matter

The correct answer is C. Slicing through a block of sodium

Explanation:

Physical changes imply a change in density, state, shape, volume, etc. of a substance, but not changes in the chemical properties or chemical composition of it. Due to this, physical changes include processes such as boiling a substance, cutting it or freezing it as these processes only affect physical properties. On the opposite, processes such as oxidation or combustion that affect the composition of a substance lead to chemical changes.

According to this, the one that is an example of physical change is "Slicing through a block of sodium" because this process involves only a change in the volume or shape of the substance that is the block of sodium which means it changes physically but its identity and chemical properties remain intact.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

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