Chemical & Physical Changes

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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into different substances with distinct properties, often involving a chemical reaction.

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What is a physical change?

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A physical change is a process that alters the form or appearance of a substance without changing its chemical composition.

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What happens to the molecules during a physical change?

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During a physical change, the molecules may rearrange or change state (e.g., solid to liquid) but their chemical structure remains the same.

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What happens to the molecules during a chemical change?

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

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What is an example of a physical change?

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Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical composition.

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What is an example of a chemical change?

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Rusting of iron is an example of a chemical change, as it involves a reaction with oxygen to form iron oxide.

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How can you identify a chemical change?

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Signs of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

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How can you identify a physical change?

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Signs of a physical change include changes in state (solid, liquid, gas), shape, or size without any change in chemical composition.

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What is the significance of cutting hair in terms of physical change?

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Cutting hair is a physical change because it alters the length and appearance of the hair without changing its chemical structure.

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What type of change is breaking a window?

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Breaking a window is a physical change, as it alters the shape and structure of the glass but does not change its chemical composition.