Physical and chemical changes

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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 freezing) and changes in shape or size.

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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 making or breaking bonds between atoms. Examples include rusting of iron and burning wood.

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Is freezing juice a physical or chemical change?

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Freezing juice is a physical change because it changes the state of the juice from liquid to solid without changing its chemical composition.

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What happens during condensation?

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During condensation, water vapor (gas) changes into liquid water. This is a physical change as the chemical structure of water remains the same.

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What is weathering?

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Weathering is the process of breaking down rocks and minerals through physical or chemical means. It is considered a physical change when it involves the physical breakdown of materials.

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What is erosion?

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Erosion is the process by which soil and rock are removed from one location and transported to another. It is a physical change as it involves the movement of materials without altering their chemical composition.

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What are examples of physical changes?

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Examples of physical changes include melting ice, boiling water, dissolving sugar in water, and breaking a glass.

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What are examples of chemical changes?

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Examples of chemical changes include burning wood, rusting iron, baking a cake, and souring milk.

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How can you identify a chemical change?

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Signs of a chemical change include color change, temperature change, gas production, 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, shape, or size, without any change in chemical composition.