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.

b

explanation:

mitosis

i believe the answer is three water molecules