Review Physical and CHemical Properties and Changes

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What is a physical change?

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A physical change is a change in the form or appearance of matter without altering its chemical composition. Examples include cutting, bending, and dissolving.

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What is a chemical change?

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A chemical change is a process that transforms one substance into another, creating new substances with different properties. This often involves a change in energy, such as heat or light.

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What are physical properties?

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Physical properties are characteristics of a substance that can be observed or measured without changing its identity. Examples include color, density, and melting point.

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What is an example of a physical change that results in a color change?

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A red candy dissolving in water and turning the water pink is an example of a physical change that results in a color change.

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What are some examples of physical changes?

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Examples of physical changes include cutting paper, melting ice, and dissolving sugar in water.

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What is the difference between physical and chemical changes?

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Physical changes do not create new substances, while chemical changes do. Physical changes affect the form of a substance, whereas chemical changes affect its composition.

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What happens during a chemical change?

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During a chemical change, bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

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Can physical changes be reversed?

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Many physical changes can be reversed, such as freezing and melting water, but some may not be easily reversible.

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What is an example of a chemical change?

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An example of a chemical change is burning wood, which produces ash, smoke, and gases, creating new substances.

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What is the significance of observing physical properties?

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Observing physical properties helps identify and classify substances based on their characteristics without altering their chemical structure.