Physical Changes Quiz

The main difference is that physical changes affect the form of a substance without changing its chemical composition, while chemical changes alter the chemical composition of a substance.

An example of a physical change is the process of tempering steel to form a knife blade. It is considered a physical change because it involves a change in physical properties such as hardness, flexibility, and the ability to maintain a sharp edge, without altering the chemical composition of the steel.

Examples of physical properties that can change during a physical change include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume, and density.

<p>Physical changes are generally reversible using physical means. An example of this is the recovery of salt dissolved in water by allowing the water to evaporate.</p> Signup and view all the answers

<p>Reversibility is not a certain criterion for classifying physical changes because many chemical changes are irreversible, and many physical changes are reversible, so it is not a definitive factor in classification.</p> Signup and view all the answers