Physical vs Chemical Change Worksheet

Are you in need of a useful tool to help your students practice distinguishing between physical and chemical changes? Look no further! We have created a comprehensive and engaging Physical vs Chemical Change Worksheet that is perfect for middle school science students. With a clear focus on the concept of changes in matter, this worksheet is designed to challenge and strengthen their understanding of the different processes involved in both physical and chemical changes.

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What is a physical change?

A physical change is a transformation in a substance that does not alter its chemical composition, meaning the molecules remain the same before and after the change. This can involve changes in the state of matter, such as melting, freezing, or evaporating, as well as alterations in shape, size, or appearance.

Give an example of a physical change.

Melting of ice is an example of a physical change, where the solid ice turns into liquid water without changing its chemical composition.

What is a chemical change?

A chemical change refers to a transformation in substances where the original materials are converted into one or more new substances with different chemical compositions. This process usually involves the breaking and forming of chemical bonds, resulting in a change in the properties of the substances involved, such as color, temperature, or state.

Provide an example of a chemical change.

An example of a chemical change is the rusting of iron. When iron is exposed to oxygen and water, a chemical reaction occurs, resulting in the formation of iron oxide, or rust. This change is irreversible and produces new substances with different chemical properties than the original iron.

How can you distinguish between physical and chemical changes?

Physical changes involve a change in the form or state of a substance without altering its chemical composition, such as melting ice to water, while chemical changes result in the formation of new substances with different chemical properties, such as iron rusting or wood burning. Physical changes are usually reversible, whereas chemical changes are often irreversible. Additionally, physical changes typically do not involve the release of energy, while chemical changes often involve the absorption or release of energy in the form of heat or light.

Does a physical change result in the formation of new substances?

No, a physical change does not result in the formation of new substances. It involves a change in the state or appearance of a substance without changing its chemical composition. Examples of physical changes include melting, freezing, evaporating, or dissolving.

Does a chemical change result in the formation of new substances?

Yes, a chemical change typically results in the formation of one or more different substances. During a chemical change, chemical bonds are broken and new bonds are formed, leading to a chemical reaction that results in the conversion of the initial substances into new substances with different properties.

Can physical changes be reversed?

Yes, physical changes can often be reversed. This can depend on the type of change and the methods available to reverse it. For example, melting and freezing substances is a reversible physical change, as is breaking and then reassembling an object. However, some physical changes may be irreversible, such as burning wood or rusting metal.

Can chemical changes be reversed?

Chemical changes are typically irreversible, as they involve the formation of new substances with different chemical properties. Reversing a chemical change would require breaking of the chemical bonds that were formed during the reaction, which often requires different conditions or chemical reactions. While some reversible chemical reactions exist, most chemical changes are considered irreversible.

Is energy usually absorbed or released during a physical change?

Energy is typically either absorbed or released during a physical change. For example, energy is often absorbed when a substance melts, evaporates, or sublimes, as the particles gain energy to overcome intermolecular forces. Conversely, energy is usually released when a substance freezes or condenses, as the particles release energy to form ordered structures.