U6 Day 3 - Physical and Chemical Changes/Properties

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or boiling), size, or shape.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the chemical composition of the substance. Examples include rusting, burning, and souring of milk.

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, density, mass, and boiling point.

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What is a chemical property?

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A chemical property is a characteristic of a substance that becomes evident during a chemical reaction. It describes the substance's ability to undergo changes that transform it into different substances. Examples include reactivity with acids, flammability, and oxidation states.

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What is an example of a clue that a chemical change has occurred?

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Change in temperature is a clue that a chemical change has occurred, indicating that a reaction is taking place.

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Is boiling water a physical or chemical change?

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Boiling water is a physical change because it changes the state of water from liquid to gas without altering its chemical composition.

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Is rusting of iron a physical or chemical change?

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Rusting of iron is a chemical change because it involves the reaction of iron with oxygen to form iron oxide, a new substance.

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What happens to the molecules during a physical change?

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During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same and retain their chemical identity.

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What happens to the molecules during a chemical change?

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During a chemical change, the bonds between molecules are broken and new bonds are formed, resulting in the creation of new substances with different chemical identities.

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What is an example of a physical change?

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An example of a physical change is tearing a piece of paper. The paper's composition remains the same, but its shape and size change.