A change in size, shape, or state of matter.

A change in size, shape, or state of matter.

• A. Physical change
• B. Chemical change
• C. Phase change
• D. Nuclear change

Answer: (A)

Changing size, shape, or state of matter is a physical change because the substance itself remains the same kind of matter; only its appearance or form is altered. For example, melting ice to water changes the state from solid to liquid, and bending a wire or cutting a sheet of paper changes its shape or size without creating a new substance. These changes don't alter the chemical identity of the material. Phase change is a specific type of physical change focused on changing state (solid, liquid, gas), so it fits under the broader idea of physical change, but the general category that covers all these examples is physical change. Chemical changes, on the other hand, produce new substances with different compositions, like iron rusting or wood burning. Nuclear changes involve changes in the nucleus of atoms and involve energy changes not described by simply altering size, shape, or state.

Changing size, shape, or state of matter is a physical change because the substance itself remains the same kind of matter; only its appearance or form is altered. For example, melting ice to water changes the state from solid to liquid, and bending a wire or cutting a sheet of paper changes its shape or size without creating a new substance. These changes don't alter the chemical identity of the material.

Phase change is a specific type of physical change focused on changing state (solid, liquid, gas), so it fits under the broader idea of physical change, but the general category that covers all these examples is physical change.

Chemical changes, on the other hand, produce new substances with different compositions, like iron rusting or wood burning. Nuclear changes involve changes in the nucleus of atoms and involve energy changes not described by simply altering size, shape, or state.